TOHOKU UNIVERSITY Researchers - Toshitaka Ikeshoji

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Toshitaka Ikeshoji

Section

New Industry Creation Hatchery Center

Job title

Specially Appointed Associate Professor(Research)

Degree

Doctor of Engineering (The University of Tokyo)

researchmap

https://researchmap.jp/ikeshojitt

J-GLOBAL ID

200901073927468714

Research History 12

2025/04 - Present

Tohoku University　New Industry Creation Hatchery Center　Researcher
2024/05 - 2025/03

Institute of Science Tokyo　Mechanical Engineering, School of Engineering　Researcher
2022/04 - 2023/03

Kindai University　Fundamental Technology for Next Generation Research Institute　Visiting Associate Professor
2022/04 - 2023/03

Technology Research Association for Future Additive Manufacturing; TRAFAM　Specially Appointed Researcher
2015/04 - 2019/03

Kindai University　Fundamental Technology Research Institute for Next Generation　Associate Professor
2007/04 - 2015/03

Tokyo Institue of Technology　Faculty of Science & Engineering　Assistant Professor
2006/09 - 2007/08

National Aeronautics and Space Administration ; NASA　Goddard Space Flight Center ; GSFC　Visiting Scientist
1998/04 - 2007/03

Tokyo Institue of Technology　Faculty of Engineering　Rsearch Associate
2005/04 - 2006/03

Meiji University　Faculty of Engineering, Dept. Mechanical Engineering　Adjunct Lecturer
2020/04 - 2022/03

Kindai University　Fundamental Technology for Next Generation Research Institute　Specially Appointed Researcher
2019/04 - 2020/03

Kindai University　Fundamental Technology for Next Generation Research Institute　Visiting Associate Professor
2014/04 - 2015/03

Kindai University　Fundamental Technology Research Institute for Next Generation　Adjunct Associate Professor

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Education 2

Graduate School of University of Tokyo　Faculty of Engineering　Dept. Aeronautics & Astronautics

1995/04 - 1998/03
Tokyo Institute of Technology　Faculty of Engineering　Dept. Mechanical Science & Engineering

1989/04 - 1993/03

Committee Memberships 8

ISO/TC 261/JWG 10 "Joint ISO/TC 261 - ISO/TC 44/SC 14 WG, Additive manufacturing in aerospace applications"　Committee Member

2017/10 - Present
ISO/TC 044/SC 14 "Welding and brazing in aerospace"　Comittee Member

2016/04 - Present
溶接学会　軽構造接合加工研究委員会幹事委員

2002 - Present
一般社団法人溶接学会中国支部　幹事委員

2017/03 - 2023/03
溶接学会　界面接合研究委員会幹事委員

2010/04 - 2023/03
一般社団法人日本溶接協会　東部地区溶接検定委員

2014/04 - 2015/03
（社）日本溶接協会　重ね抵抗溶接用機械式ピール試験規格検討委員会

2011/04 - 2013/03
Japan Society of Weldings　Research Comittee of Light Weight Structure Joinings

2002 -

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Professional Memberships 10

AMS International
American Welding Soceity
溶接学会
日本機械学会
The Material Information Society
AMS International
American Welding Soceity
Japanese Society of Tribologists
Japan Society of Weldings
Japan Society of Mechanical Engineers

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Research Interests 3

Brazing
Jonining Technology
Metal Additive Manufacturing

Research Areas 3

Aerospace, marine, and maritime Engineering / Aerospace engineering / Material Science & Engineering for Aeronautics & Astronautics
Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Manufacturing and production engineering / Joining Technology
Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Manufacturing and production engineering / Additive Manufacturing

Awards 4

Welding Technology Encouragement Award

2019/03　Japan Welding Society
Interface Joining Incentive Research Award

2010　Interface Joining Research Committee, Japan Welding Society　Effect of ply-compiling direction and fiber direction to active braze joint of C/C composites and Ti
JGN２を活用した研究開発アイデアコンテスト最優秀賞

2007
日本機械学会機械材料・材料加工部門部門一般表彰（新技術開発部門）

2003

Papers 46

Formability of Recycled Al-10%Si-0.4%Mg Alloy Powder by Laser Powder Bed Fusion Additive Manufacturing

Takafumi IKEDA, Makiko YONEHARA, Isao MURAKAMI, Taku MURAKAWA, Toshi-Taka IKESHOJI, Hideki KYOGOKU

Journal of the Japan Society of Powder and Powder Metallurgy　72　(2)　51-58　2025/02/15
Publisher: Japan Society of Powder and Powder Metallurgy
DOI： 10.2497/jjspm.24-00055 　

ISSN： 0532-8799

eISSN： 1880-9014
Assessing powder processability and melting behavior in powder-bed fusion additive manufacturing

Kazuaki Takaku, Shota Suzuki, Toshi-Taka Ikeshoji, Hideki Kyogoku

Materials & Design　240　112877-112877　2024/04
Publisher: Elsevier BV
DOI： 10.1016/j.matdes.2024.112877 　

ISSN： 0264-1275
Quality assessment of SUS316L fabricated by metal additive manufacturing with eddy current inspection

Wenxu Sun, Tomoki Kasa, Yoshimi Hatsukade, Makiko Yonehara, Toshitaka Ikeshoji, Hideki Kyogoku

NDT & E International　138　102901-102901　2023/09
Publisher: Elsevier BV
DOI： 10.1016/j.ndteint.2023.102901 　

ISSN： 0963-8695
Laser beam powder bed fusion of Inconel 718 under high power and scanning speed

Toshi-Taka IKESHOJI, Yusuke TACHIBANA, Makiko YONEHARA, Hideki KYOGOKU

Journal of Advanced Mechanical Design, Systems, and Manufacturing　17　(6)　JAMDSM0081-JAMDSM0081　2023
Publisher: Japan Society of Mechanical Engineers
DOI： 10.1299/jamdsm.2023jamdsm0081 　

eISSN： 1881-3054
Eddy Current Testing Based Non-destructive Inspection for Metal 3D Additive manufacturing Objects with HTS-SQUID

Tomoki Kasa, Wenxu Sun, Yoshimi Hatsukade, Makiko Yonehara, Toshi-Taka Ikeshoji, Hideki Kyogoku

IEEE Transactions on Applied Superconductivity　1-5　2023
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
DOI： 10.1109/tasc.2023.3248001 　

ISSN： 1051-8223

eISSN： 1558-2515 2378-7074
Spattering mechanism of laser powder bed fusion additive manufacturing on heterogeneous surfaces

Toshi-Taka Ikeshoji, Makiko Yonehara, Chika Kato, Yuma Yanaga, Koki Takeshita, Hideki Kyogoku

Scientific Reports　12　(1)　2022/11/27
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-022-24828-9 　

eISSN： 2045-2322

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Abstract Laser powder additive manufacturing (PBF-LB) is an additive manufacturing method capable of producing high-precision and fully dense parts. However, nondestructively quality assurance of no internal defects remains challenging. Mitigating internal defects requires elucidating their formation mechanism and improving the PBF-LB process conditions. Therefore, we developed an in-situ monitoring system that combines surface morphology measurement by fringe projection and thermal field measurement with a high-speed camera. On heterogeneous surfaces in a practical multi-track PBF-LB process, a roughness index of the built part surface altered cyclically, consistent with the change in the angle between laser scanning and atmospheric gas flow. The high-speed camera monitoring showed that the melt pool was asymmetrical and spindle-shaped and that spatter was emitted mainly from the built part side of the melt pool. Furthermore, it was found that the built-part surface morphology under the powder layer affected the stability of the melt pool. As a result, a graphical representation of the melt pool and spattering for heterogeneous surfaces was proposed. Although it is still difficult to theoretically estimate the process window in which no spattering and no internal defects, in-situ monitoring equipment will provide knowledge to elucidate spattering and internal defects formation.
Optimization of process parameters in laser beam powder bed fusion using surface texture and density of Inconel 718

Yusuke TACHIBANA, Toshi-Taka IKESHOJI, Makiko YONEHARA, Hideki KYOGOKU

Journal of Advanced Mechanical Design, Systems, and Manufacturing　16　(5)　JAMDSM0050-JAMDSM0050　2022
Publisher: Japan Society of Mechanical Engineers
DOI： 10.1299/jamdsm.2022jamdsm0050 　

eISSN： 1881-3054
Correlation between surface texture and internal defects in laser powder-bed fusion additive manufacturing

Makiko Yonehara, Chika Kato, Toshi-Taka Ikeshoji, Koki Takeshita, Hideki Kyogoku

Scientific Reports　11　(1)　2021/12
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-021-02240-z 　

eISSN： 2045-2322

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<title>Abstract</title>The availability of an in-situ monitoring and feedback control system during the implementation of metal additive manufacturing technology ensures that high-quality finished parts are manufactured. This study aims to investigate the correlation between the surface texture and internal defects or density of laser-beam powder-bed fusion (LB-PBF) parts. In this study, 120 cubic specimens were fabricated via application of the LB-PBF process to the IN 718 Ni alloy powder. The density and 35 areal surface-texture parameters of manufactured specimens were determined based on the ISO 25,178–2 standard. Using a statistical method, a strong correlation was observed between the areal surface-texture parameters and density or internal defects within specimens. In particular, the areal surface-texture parameters of reduced dale height, core height, root-mean-square height, and root-mean-square gradient demonstrate a strong correlation with specimen density. Therefore, in-situ monitoring of these areal surface-texture parameters can facilitate their use as control variables in the feedback system.
Committee of Joining and Materials Processing for Light Structures

H. Serizawa, M. Iyota, T. Ogura, M. Kimura, T. Satsuta, T. Yasui, T. Ikeshoji

Journal of the Japan Welding Society　90　(5)　71-81　2021/07
Publisher: JAPAN WELDING SOCIETY
DOI： 10.2207/jjws.90.373 　

ISSN： 0021-4787

eISSN： 1883-7204
Influences of powder characteristics and recoating conditions on surface morphology of powder bed in metal additive manufacturing

Kenya Yuasa, Masaharu Tagami, Makiko Yonehara, Toshi-Taka Ikeshoji, Koki Takeshita, Hiroshi Aoki, Hideki Kyogoku

The International Journal of Advanced Manufacturing Technology　2021/06/12
Publisher: Springer Science and Business Media LLC
DOI： 10.1007/s00170-021-07359-x 　

ISSN： 0268-3768

eISSN： 1433-3015

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<title>Abstract</title>Metal additive manufacturing technology requires a real-time monitoring and feedback control system to assure the quality of the final products. In particular, it is essential to reveal the phenomena of recoating and melting-solidification processes in laser powder bed fusion using a real-time monitoring system because they influence strongly the occurrence of defects. This study was conducted to elucidate the correlation among the powder characteristics, recoating conditions, and surface morphology of a powder bed in the recoating process to determine the relationship between the surface morphology of the powder bed and the final product quality. To this end, a surface morphology measurement system composed of a powder recoating test bench and a layer surface morphology measurement apparatus was first designed and fabricated. Then, it was used to quantify the surface morphology of the powder bed. Specifically, the influences of the different powder characteristics and the recoating parameters of the powder supply ratio and recoating speed on the surface morphology of the powder bed were investigated using various powders of Al-10Si-0.4Mg (AlSi10Mg) alloy and Inconel 718 (IN718) alloy. The surface morphology of the powder bed was measured as the value of 2σ at a resolution of 30 μm in height. It was found that the angle of repose and the basic flow energy of the bulk powder are promising parameters for evaluating the surface morphology. The surface morphology was significantly affected by the powder characteristics and recoating speed. The value of 2σ for the AlSi10Mg powder increased rapidly over a recoating speed of 50 mm/s for all powders. The value of 2σ for the irregularly shaped AlSi10Mg powder was approximately 19 μm, and the 2σ values for the other powders were approximately 17 μm at a recoating speed of 15 mm/s. However, at a recoating speed greater than 300 mm/s, the irregularly shaped powder exhibited better surface morphology than did the spherical powder. The recycling process deteriorated the flowability of the new powder. However, the surface morphology of the spherical recycled powder was similar to that of the spherical powder. Consequently, the correlation among the powder characteristics, recoating conditions, and surface morphology of the powder bed was revealed by employing the surface morphology measurement system. Quantification of the surface morphology of the powder bed using the monitoring system facilitates control of the recoating process to prevent the occurrence of defects.
Influences of Process Parameters on the Microstructure and Mechanical Properties of CoCrFeNiTi Based High-Entropy Alloy in a Laser Powder Bed Fusion Process

Takafumi Ikeda, Makiko Yonehara, Toshi-Taka Ikeshoji, Tohru Nobuki, Minoru Hatate, Kosuke Kuwabara, Yasuhiko Otsubo, Hideki Kyogoku

Crystals　11　(5)　549-549　2021/05/14
Publisher: MDPI AG
DOI： 10.3390/cryst11050549 　

eISSN： 2073-4352

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Recently, high-entropy alloys (HEAs) have attracted much attention because of their superior properties, such as high strength and corrosion resistance. This study aimed to investigate the influences of process parameters on the microstructure and mechanical properties of CoCrFe NiTiMo HEAs using a laser-based powder bed fusion (LPBF) process. In terms of laser power and scan speed, a process map was constructed by evaluating the density and surface roughness of the as-built specimen to optimize the process parameters of the products. The mechanical properties of the as-built specimens fabricated at the optimum fabrication condition derived from the process map were evaluated. Consequently, the optimum laser power and scan speed could be obtained using the process map evaluated by density and surface roughness. The as-built specimen fabricated at the optimum fabrication condition presented a relative density of more than 99.8%. The microstructure of the as-built specimen exhibited anisotropy along the build direction. The tensile strength and elongation of the as-built specimen were around 1150 MPa and more than 20%, respectively.
Influence of powder particle morphology on properties of Al-10Si-0.4Mg alloy fabricated by high-power and high-speed conditions of laser powder bed fusion process

Chika KATO, Toshi-Taka IKESHOJI, Makiko YONEHARA, Sotaro AKIYAMA, Isao MURAKAMI, Yoshiki HASHIZUME, Hideki KYOGOKU

Keikinzoku/Journal of Japan Institute of Light Metals　70　(10)　475-482　2020/10/15
Publisher: Japan Institute of Light Metals
DOI： 10.2464/jilm.70.475 　

ISSN： 0451-5994
Parameter optimization of the high-power laser powder bed fusion process for H13 tool steel Peer-reviewed

Makiko Yonehara, Toshi-Taka Ikeshoji, Takaya Nagahama, Takashi Mizoguchi, Makoto Tano, Takayuki Yoshimi, Hideki Kyogoku

INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY　110　(1-2)　427-437　2020/09

DOI： 10.1007/s00170-020-05879-6 　

ISSN： 0268-3768

eISSN： 1433-3015
The Processability of Highly Spherical Gas-Atomized Ti-6Al-4V Alloy Powder in Laser Powder Bed Fusion

Kazuya NAKAMURA, Toshi-Taka IKESHOJI, Koichiro SEKIMOTO, Teppei OKUMURA, Hideki KYOGOKU

Journal of the Japan Society of Powder and Powder Metallurgy　67　(8)　424-430　2020/08/15
Publisher: Japan Society of Powder and Powder Metallurgy
DOI： 10.2497/jjspm.67.424 　

ISSN： 0532-8799

eISSN： 1880-9014
Investigation of Optimum Fabrication Condition of High-Entropy Alloy by Laser-Based Powder Bed Fusion Process and It's Mechanical Properties

IKEDA Takafumi, IKESHOJI Toshi-Taka, HATATE Minoru, NOBUKI Tohru, KYOGOKU Hideki

The Proceedings of Mechanical Engineering Congress, Japan　2020　S04111　2020
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecj.2020.S04111 　

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<p>Recently, high-entropy alloys have attracted much attention because of their superior properties such as high strength and corrosion resistance. In this study, the optimum fabrication of CoCrFeNiTiMo high-entropy alloy by laser-based powder bed fusion process was investigated. The process map for the effects of the laser power and scan speed on the surface roughness and density of the as-built specimens was constructed to optimize the process parameters of the parts. Also, the mechanical properties of the as-built specimens fabricated at the optimum process parameter derived from the process map were examined. Consequently, the optimum laser power and scan speed can be obtained using the process map for the effects of the laser power and scan speed on the surface roughness and density. The as-built specimen fabricated at the optimum fabrication condition showed a relative density of more than 99.7 %. The tensile strength and elongation of the as-built specimen were around 1150 MPa and more than 20%, respectively. The tensile properties of the as-built specimen obtained in this study are similar to those of the as-built specimen reported by other studies.</p>
Densification of pure copper by selective laser melting process

Ken Imai, Toshi-Taka Ikeshoji, Yuji Sugitani, Hideki Kyogoku

MECHANICAL ENGINEERING JOURNAL　7　(2)　2020

DOI： 10.1299/mej.19-00272 　

ISSN： 2187-9745
A review of metal additive manufacturing technologies: Mechanism of defects formation and simulation of melting and solidification phenomena in laser powder bed fusion process

Hideki Kyogoku, Toshi-Taka Ikeshoji

MECHANICAL ENGINEERING REVIEWS　7　(1)　2020

DOI： 10.1299/mer.19-00182 　

ISSN： 2187-9753
New development of metal laser additive manufacturing technology

Hideki Kyogoku, Toshi-Taka Ikeshoji

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy　66　(2)　89-96　2019/02/01
Publisher: Journal of the Japan Society of Powder and Powder Metallurgy
DOI： 10.2497/jjspm.66.89 　

ISSN： 0532-8799
Selective Laser Melting of Pure Copper Peer-reviewed

Toshi-Taka Ikeshoji, Kazuya Nakamura, Makiko Yonehara, Ken Imai, Hideki Kyogoku

JOM　70　(3)　396-400　2018/03

DOI： 10.1007/s11837-017-2695-x 　

ISSN： 1047-4838

eISSN： 1543-1851
Parameter optimization on the fabrication of Al-10Si-0.4Mg alloy using selective laser melting process

Masahiro Araki, Shinnosuke Kusakawa, Kazuhiro Nakamura, Makiko Yonehara, Toshi-Taka Ikeshoji, Hideki Kyogoku

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy　65　(7)　383-388　2018
Publisher: Journal of the Japan Society of Powder and Powder Metallurgy
DOI： 10.2497/jjspm.65.383 　

ISSN： 0532-8799
Fabrication of Cu-Al-Ni Shape Memory Alloy by Selective Laser Melting Process

Ken Imai, Toshi-Taka Ikeshoji, Kazuya Nakamura, Motonori Nishida, Yuji Sugitani, Hideki Kyogoku

THERMEC 2018: 10TH INTERNATIONAL CONFERENCE ON PROCESSING AND MANUFACTURING OF ADVANCED MATERIALS　941　1570-1573　2018

DOI： 10.4028/www.scientific.net/MSF.941.1570 　

ISSN： 0255-5476
Melting and Solidification Behavior of High-Strength Aluminum Alloy during Selective Laser Melting

Hideki Kyogoku, Kohei Yamamoto, Toshi-Taka Ikeshoji, Kazuya Nakamura, Makiko Yonehara

THERMEC 2018: 10TH INTERNATIONAL CONFERENCE ON PROCESSING AND MANUFACTURING OF ADVANCED MATERIALS　941　1300-1305　2018

DOI： 10.4028/www.scientific.net/MSF.941.1300 　

ISSN： 0255-5476
Selective Laser Melting of Inconel 718 under High Power and High Scanning Speed Conditions

Yusuke Tachibana, Toshi-Taka Ikeshoji, Kazuya Nakamura, Makiko Yonehara, Hideki Kyogoku

THERMEC 2018: 10TH INTERNATIONAL CONFERENCE ON PROCESSING AND MANUFACTURING OF ADVANCED MATERIALS　941　1574-1578　2018

DOI： 10.4028/www.scientific.net/MSF.941.1574 　

ISSN： 0255-5476
Thermal Feild around Laser Spot of SLM Process and Microstructure of Its Built Material

Ikeshoji Toshi-Taka, Kyogoku Hideki, Yonehara Makiko, Araki Masahiro

Preprints of the National Meeting of JWS　2016　26-27　2016
Publisher: JAPAN WELDING SOCIETY
DOI： 10.14920/jwstaikai.2016s.0_26 　
A study of heat-resistant joining of cBN using Zr and hot filament method

Yamamoto Hideyuki, Yamazaki Takahisa, Suzumura Akio, Ikeshoji Toshi-Taka

Preprints of the National Meeting of JWS　2014　298-299　2014
Publisher: JAPAN WELDING SOCIETY
DOI： 10.14920/jwstaikai.2014f.0_298 　
Brazing of C/C composites and Ni-based refractory metal using whisker reignforced metal matrix brazing layer

Ikeshoji Toshi-Taka, Aoki Yu, Suzumura Akio, Yamazaki Takahisa

Preprints of the National Meeting of JWS　2014　268-269　2014
Publisher: JAPAN WELDING SOCIETY
DOI： 10.14920/jwstaikai.2014f.0_268 　
Effect of Si or SiO2 on bead shape of 316L stainless steel during AA-TIG welding

KUBO Toshiki, YAMAZAKI Takahisa, IKESYOJI Toshi-Taka, SUZUMURA Akio

Preprints of the National Meeting of JWS　2014　86-87　2014
Publisher: JAPAN WELDING SOCIETY
DOI： 10.14920/jwstaikai.2014f.0_86 　
Flow curves of Sn and Sn-3.5Ag obtained by rotational viscometry using a stainless steel cone Peer-reviewed

Takahisa Yamazaki, Shinya Oishi, Hirosato Gamou, Toshi-Taka Ikeshoji, Akio Suzumura

INTERNATIONAL SYMPOSIUM ON INTERFACIAL JOINING AND SURFACE TECHNOLOGY (IJST2013)　61　2014

DOI： 10.1088/1757-899X/61/1/012021 　

ISSN： 1757-8981
Surface modification of graphite and ceramics with metals using induction heating Peer-reviewed

Toshi-Taka Ikeshoji, Akiko Imoto, Akio Suzumura, Mana Katori, Takahisa Yamazaki, Masahiro Sakamoto, Satoshi Sakimichi

INTERNATIONAL SYMPOSIUM ON INTERFACIAL JOINING AND SURFACE TECHNOLOGY (IJST2013)　61　2014

DOI： 10.1088/1757-899X/61/1/012025 　

ISSN： 1757-8981
Brazing of C/C composites and Ni-based alloy using interlayer Peer-reviewed

Toshi-Taka Ikeshoji, Tatsuya Tokunaga, Akio Suzumura, Takahisa Yamazaki

INTERNATIONAL SYMPOSIUM ON INTERFACIAL JOINING AND SURFACE TECHNOLOGY (IJST2013)　61　2014

DOI： 10.1088/1757-899X/61/1/012013 　

ISSN： 1757-8981
Brazing of C/C composites and heat resistance alloy with stress relief interlayer.

Ikeshoji Toshi-Taka, Tokunaga Tatsuya, Suzumura Akio, Yamazaki Takahisa

Preprints of the National Meeting of JWS　2013　356-357　2013
Publisher: JAPAN WELDING SOCIETY
DOI： 10.14920/jwstaikai.2013f.0.356.0 　
EPR Reactivity of Braze-Pressure Welding Joint of Austenitic Stainless Steel

IKESHOJI Toshi-Taka, KURODA Keisuke, KATORI Mana, SUZUMURA Akio, YAMAZAKI Takahisa

JSMME　7　(2)　264-272　2013
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jmmp.7.264 　

ISSN： 1880-9871

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For the austenitic stainless steel of SUS316L and SUS304L, the braze pressure welding (BPW) was applied with variation in the total heating time 60s-660s, and with the cleaning temperature of 1280°C and 1180°C. To evaluate the corrosion resistance of the BPW joint interface, the reactivation rate, R, of sensitization was measured using the EPR test. For SUS316L, the reactivation value increased proportionally with the total heating time. For each total heating time, its reactivation value was comparable with that of SUS304L. For enough total heating time longer than 360s, R value stayed constant. The R value was suppressed with lowering cleaning temperature. The proportional increase in the reactivation rate indicates the sensitization of the austenitic stainless steel with the total heating time. SUS316L's R value was comparable with SUS304L. Therefore, the sensitization of the BPW joint might occur by other than the precipitation of the chromium carbides. The corrosion degradation of BPW joint could considered to be due to the delta ferrite formation at higher temperature than 1200°C followed by the decomposition into the sigma phase. The results of this research suggest the sensitization of BPW joint could be suppressed by shortening the total heating time.
Metallization of diamond using Ai-Si-Mn filler by infrared heater

YAMAZAKI Takahisa, SAKAGUCHI Shuji, IKESHOJI Toshitaka, SUZUMURA Akio

Preprints of the National Meeting of JWS　91　366-367　2012/09/03
Publisher: JAPAN WELDING SOCIETY
DOI： 10.14920/jwstaikai.2012f.0.366.0 　
Brazing of C/C composites and Refractory Alloys with Insertmetal

IKESHOJI Toshi-Taka, AMANUMA Tetsutaro, SUZUMURA Akio, YAMAZAKI Takahisa

Preprints of the National Meeting of JWS　90　76-77　2012/03/15
Publisher: JAPAN WELDING SOCIETY
DOI： 10.14920/jwstaikai.2012s.0.76.0 　

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If C/C composites can form the joint with the heat resistant alloy, their application would expand. But the large mismatch in CTE of C/C and that of the heat resistant alloy prevent the formation of sound joints. In this research, Ni-based brazing filler and the interlayer is applied in brazing of C/C, which will relax the residual stress in the brazing interface. The obtained brazed joint was evaluated by the shear fracture test and SEM observation of its microstructure.
Dissolution of stainless steel in molten Sn-Bi solder on shear flow

Takahisa Yamazaki, Maki Nishiyama, Toshi-Taka Ikeshoji, Akio Suzumura

IBSC 2012 - Proceedings of the 5th International Brazing and Soldering Conference　202-206　2012
Sensitization of braze-pressure welding of stainless steel

Toshi-Taka Ikeshoji, Keisuke Kuroda, Mana Katori, Akio Suzumura, Takahisa Yamazaki

IBSC 2012 - Proceedings of the 5th International Brazing and Soldering Conference　379-384　2012
Brazing of C/C composites and Ni base alloys with Ag-Cu-Ti and Fe-based braze filler alloys

Toshi-Taka Ikeshoji, Tetsutaro Amanuma, Akio Suzumura, Takahisa Yamazaki

IBSC 2012 - Proceedings of the 5th International Brazing and Soldering Conference　465-469　2012
Wear property of tetrahedral amorphous carbon thick film with dispersed nano-diamond on quenched 440C stainless steel

Takahisa Yamazaki, Kouhei Fujioka, Hidenari Tsuda, Toshi-Taka Ikeshoji, Akio Suzumura

IBSC 2012 - Proceedings of the 5th International Brazing and Soldering Conference　59-62　2012
The healing effect of stearic acid applied on amorphous carbon film with dispersed nanodiamonds Peer-reviewed

T. Yamazaki, K. Shoji, T-T Ikeshoji, A. Suzumura

INTERNATIONAL SYMPOSIUM ON MATERIALS SCIENCE AND INNOVATION FOR SUSTAINABLE SOCIETY: ECO-MATERIALS AND ECO-INNOVATION FOR GLOBAL SUSTAINABILITY (ECO-MATES 2011)　379　2012

DOI： 10.1088/1742-6596/379/1/012010 　

ISSN： 1742-6588
Effect of ZnCl2 in flux for in-the-air brazing of Al-alloys/SUS304 steel

Ikeshoji Toshi-Taka, Ueno Takashi, Suzumura Akio, Yamazaki Takahisa

Preprints of the National Meeting of JWS　2011　19-19　2011
Publisher: JAPAN WELDING SOCIETY
DOI： 10.14920/jwstaikai.2011s.0.19.0 　

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When Al alloys and SUS304 steel are brazed in the air, the firm oxide films on the both surfaces formed become the obstacle against the sound-joint formation. In this research, It is investigated the effect of ratio of the ZnCl2 in the flux to the brazability of Al-alloys and SUS304 steel. As a result, approximately 10mass% of ZnCl2 improved the wettability. The addition of KF improves the flowability of the flux to yeild stronger brazing joints.
For the Comemory of LOT 2010

IKESYOJI Toshi-Taka

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY　79　(8)　768-770　2010/12/05
Publisher: JAPAN WELDING SOCIETY
DOI： 10.2207/jjws.79.768 　

ISSN： 0021-4787
2549 Brazing between dissimilar metals/alloys of stainless steel and aluminum alloys in the air

SUZUMURA Akio, IKESHOJI Toshi-Taka, LIU Shuring, YAMAZAKI Takahisa

The proceedings of the JSME annual meeting　2007　483-484　2007
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2007.1.0_483 　

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Brazing of stainless steel to various aluminum alloys had been carried out using Al-Si brazing filler with flux in the air. The brazing properties changed remarkably with kinds of aluminum alloy, and most of the Al alloys showed poor braze-ability. The reason for the poor braze-ability is considered as the rapid isothermal solidification of the filler due to the reaction between the aluminum alloy base metal and the brazing filler. In order to clarify such brazing conditions for making sound joints of Al-alloys to stainless steel, the solidification time is estimated by the numerical analysis in case of Al-Si binary alloy system, and is also measured experimentally. In order to obtain the brazed joint between the Al alloys and stainless steel, the initial brazing filler layer and the holding time at the brazing temperature are presented based on the results.
2807 Applicability of Braze-Pressure-Welding (BPW) Technology to Austenitic Stainless Steel Pipe Joint

SUZUMURA Akio, Inagaki Yohei, IKESHOJI Toshi-Taka, YAMAZAKI Takahisa

The proceedings of the JSME annual meeting　2006　265-266　2006
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2006.1.0_265 　

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Braze Pressure Welding (BPW) with high frequency induction heating is a newly developed pressure welding technique using interlayer metals for welding the general steel pipes for pipe arrangement in buildings. At a joining temperature in this method, the melted interlayer removes contaminations from the joining surface of the base metal. Then the liquid filler is discharged from the joining interface by the joining pressure, and forms fillets at the gaps around the joint. The fillets have the effects both on relaxing the stress concentration at the joint and on increasing the joining area, which contribute to the strengthening of the joint. Thus, the high quality pipe joining without the dispersion in joint properties due to welder's skill can be performed. In this report, applicability of the BPW technology to austenitic stainless steel pipe joint is investigated and discussed on the results of microscopy and tensile tests of the joints.
Joint strength of pipe joint specimen for rocket nozzle skirt and clearance at joint

Ikeshoji Toshi-Taka, Suzumura Akio, Yamazaki Takahisa

Preprints of the National Meeting of JWS　2004　37-37　2004
Publisher: JAPAN WELDING SOCIETY
DOI： 10.14920/jwstaikai.2004f.0.37.0 　
Erosion by Marangoni Convection of Molten Brazing Filler Metal

IKESHOJI Toshi-Taka, SUZUMURA Akio, SASABE Ken, YAMAZAKI Takahisa

Pre-Prints of the National Meeting of JWS　(73)　322-323　2003/09/08
Publisher: Japan Welding Society
DOI： 10.14920/jwstaikai.2003f.0.510.0 　
The properties and effects of the interlaier metal on the braze-pressure-welded joint of the general steel pipes with high frequency induction heating

SUZUMURA Akio, INAGAKI Yohei, IKESHOJI ToshiTaka, YAMAZAKI Takahisa

Pre-Prints of the National Meeting of JWS　(73)　318-319　2003/09/08
Publisher: Japan Welding Society
DOI： 10.14920/jwstaikai.2003f.0.515.0

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Misc. 142

1-4 ３Ｄ造形技術研究センター活動報告

京極, 秀樹, 旗手, 稔, 生田, 明彦, 池庄司, 敏孝, 信木, 関, 大森, 整

近畿大学次世代基盤技術研究所報告　(13)　23-27　2022/12
Publisher: 近畿大学次世代基盤技術研究所
ISSN： 2185-8802

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II. 令和3年度活動報告 1. センター活動 Article application/pdf
Non-Destructive Inspection of Metal 3D Additive Manufacturing Objects Made of AlSi10Mg with HTS-SQUID

笠友樹, SUN Wenxu, 廿日出好, 池庄司敏孝, 京極秀樹

応用物理学会春季学術講演会講演予稿集(CD-ROM)　69th　2022

ISSN： 2436-7613
〈令和2年度活動報告〉3D造形技術研究センター活動報告

京極, 秀樹, 旗手, 稔, 生田, 明彦, 信木, 関, 池庄司, 敏孝, 大森, 整

近畿大学次世代基盤技術研究所報告 = Annual Report of Fundamental Technology for Next Generation Research Institute, Kindai University　12　25-30　2021/08
Publisher: 近畿大学次世代基盤技術研究所
ISSN： 2185-8802

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type:Article 1. センター活動
Non-Destructive Inspection of SUS316L Produced by Laser Powder Bed Fusion Additive Manufacturing with Fluxgate Sensor

孫文旭, 笠友樹, 廿日出好, 池庄司敏孝, 京極秀樹

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　82nd　2021

ISSN： 2436-7613
〈令和元年度活動報告〉3D造形技術研究センター活動報告

京極秀樹, 旗手稔, 生田明彦, 池庄司敏孝, 信木関, 大森整

近畿大学次世代基盤技術研究所報告 = Annual Report of Fundamental Technology for Next Generation Research Institute, Kindai University　(11)　27-32　2020/07
Publisher: 近畿大学次世代基盤技術研究所
ISSN： 2185-8802

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1. センター活動
〈平成30年度活動報告〉3D造形技術研究センター活動報告

京極秀樹, 旗手稔, 生田明彦, 池庄司敏孝, 信木関, 大森整

近畿大学次世代基盤技術研究所報告 = Annual Report of Fundamental Technology for Next Generation Research Institute, Kindai University　(10)　29-34　2019/10
Publisher: 近畿大学次世代基盤技術研究所
ISSN： 2185-8802

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1. センター活動
〈平成28年度活動報告〉3D造形技術研究センター活動報告

京極秀樹, 旗手稔, 生田明彦, 池庄司敏孝, 信木関, 田上将治, 大森整, 米原牧子

近畿大学次世代基盤技術研究所報告 = Annual Report of Fundamental Technology for Next Generation Research Institute, Kindai University　8　26-32　2017/06
Publisher: 近畿大学次世代基盤技術研究所
ISSN： 2185-8802

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1. センター活動
Liquidation and Solidification Phenomena During Laser Powder Bed Fusion Process

6　(3)　109-114　2017/05
Publisher: 高温学会
ISSN： 2186-702X
3D Additive Manufacturing and Interface Phenomena

86　(3)　138-141　2017/04
Publisher: 溶接学会
ISSN： 0021-4787
The Recent Trend and Applications on Metal Additive Manufacturing : A Review

8　55-59　2017
Publisher: 近畿大学次世代基盤技術研究所
ISSN： 2185-8802
〈平成27年度活動報告〉3D造形技術研究センター活動報告

京極秀樹, 旗手稔, 生田明彦, 池庄司敏孝, 信木関, 大森整, 米原牧子

近畿大学次世代基盤技術研究所報告 = Kindai University Research Institute of Fundamental Technology for Next Generation　7　27-31　2016/07
Publisher: 近畿大学次世代基盤技術研究所
ISSN： 2185-8802

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1. センター活動
Metal Additive Manufacturing using Laser Beam

池庄司敏孝

材料の科学と工学 : 日本材料科学会誌　53　(4)　104-107　2016
Publisher: 日本材料科学会 ; 2002-
ISSN： 1347-4774
Numerical Simulation of Transient Heat Conduction Analysis in Laser Illuminated Area during SLM Process including Melting and Solidification of Powder Layer

池庄司敏孝, 京極秀樹, 米原牧子, 荒木正浩, 中村和也

近畿大学次世代基盤技術研究所報告 = Annual report of Research Institute of Fundamental Technology for Next Generation, Kindai University　7　89-94　2016
Publisher: 近畿大学次世代基盤技術研究所
ISSN： 2185-8802

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The selective laser melting(SLM) is a kind of additive manufacturing processes, which melts the thin powder layer selectively and forms 3D object by compiling many layers. To obtain the proper laser melting conditions for SLM process, the prediction of thermal field around the scanning laser spot is necessary. In this paper, a finite element method of transient heat conduction analysis is proposed to predict the thermal field. It is based on the energy conservation equation for enthalpy of bulk metal, powder metal and once-melt-and-solidified powder metal. The method includes the phenomena of melting and solidification of powder metal. The numerical simulation using this method is applied for Ni-based refractory alloy, Inconel-718, and the results of the simulation is presented with temperature contours and dimensions of melt pool.Ⅲ.論文集
〈平成26年度活動報告〉3D造形技術研究センター活動報告

京極秀樹, 旗手稔, 生田明彦, 信木関, 大森整, 池庄司敏孝, 米原牧子

近畿大学次世代基盤技術研究所報告 = Kinki University Research Institute of Fundamental Technology for Next Generation　6　27-31　2015/06/01
Publisher: 近畿大学次世代基盤技術研究所
ISSN： 2185-8802

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1. センター活動
OS1735 Brazing of C/C composites and Ni-based alloy with stress relieving layer

IKESHOJI Toshi-Taka, SUZUMURA Akio, YAMAZAKI Takahisa

M&M材料力学カンファレンス　2014　"OS1735-1"-"OS1735-2"　2014/07/19
Publisher: The Japan Society of Mechanical Engineers

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C/C composites plate was brazed to Ni-based alloy, Inconel-600 plate using Fe-Cr-Ni-(Si,P) brazing filler metal with various thickness of Nb foil inserted. Niobium foil was solved into the brazing filler layer and precipitated along the C/C composites' surface. Although, Nb layer remained in the brazed interface was thinner than the original Nb foil thickness, it acted as the stress relief layer. The shear strength of brazed joint varied with the remained Nb layer's thickness. The shear strength increased for the brazed joint with 100μm of Nb layer, but once dropped for the joint with 200μm. The FEM analysis revealed that the shear strength of brazed joint monotonously increase with Nb layer's thickness. The microstructure in the brazing filler layer was considered to contribute to the tendency of the shear strength with Nb layer thickness.
Brazing between carbon fiber reinforced composites and metals

Toshi-Taka Ikeshoji

Yosetsu Gakkai Shi/Journal of the Japan Welding Society　83　(3)　199-203　2014
Publisher: Japan Welding Society
DOI： 10.2207/jjws.83.199 　

ISSN： 0021-4787
319 Galvanic Corrosion of CFRP/Lightweight Alloys Rivet Joints

IKESHOJI Toshi-Taka, MORIMOTO Tetsuya, MASAKI Rie, AZEYANAGI Miku, SUZUMURA Akio, YAMAZAKI Takahisa

Materials and processing conference　2013　(21)　"319-1"-"319-3"　2013/11/08
Publisher: The Japan Society of Mechanical Engineers
616 Micro-Mechanical Joining of Ultra-Fine Coated Wire

ISHII Hayato, IKESHOJI ToshiTaka, SUZUMURA Akio, YAMAZAKI Takahisa

Materials and processing conference　2013　(21)　"616-1"-"616-3"　2013/11/08
Publisher: The Japan Society of Mechanical Engineers
636 Structure and hydrogen separation performance of palladium membrane separation cell

KAWATO Shingen, IKESHOJI Toshi-Taka, SUZUMURA Akio, YAMAZAKI Takahisa

Materials and processing conference　2013　(21)　"636-1"-"636-3"　2013/11/08
Publisher: The Japan Society of Mechanical Engineers
Micro-Mechanical Joining of Ultra-Fine Coated Wire

石井駿土, 池庄司敏孝, 鈴村暁男

機械材料・材料加工技術講演会 M&P　21　(21)　"616-1"-"616-3"　2013/11/08
Publisher: 日本機械学会
Structure and hydrogen separation performance of palladium membrane separation cell

川戸紳玄, 池庄司敏孝, 鈴村暁男

機械材料・材料加工技術講演会 M&P　21　(21)　"636-1"-"636-3"　2013/11/08
Publisher: 日本機械学会
Formation of manganese oxide at the HAZ surface of 316L stainless steel by AA-TIG welding

YAMAZAKI Takahisa, IKEGAMI Toshiya, IKESHOJI Toshi-Taka, SUZUMURA Akio

Preprints of the National Meeting of JWS　93　128-129　2013/08/12
Publisher: JAPAN WELDING SOCIETY
DOI： 10.14920/jwstaikai.2013f.0.128.0 　

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ステンレス薄板製密閉容器を作製するため，SUS316L鋼薄板を深い溶け込みの得られるAA-TIGを用いて，溶接を行った。アルゴンガスでバックシールドを施したにも関わらす，裏側のボンド部でマンガン酸化物の形成が認められた。
Comparison of the flow curves for Sn-Bi solder and pure Sn using a cone and plate rotational viscometer

GAMOU Hirosato, YAMAZAKI Takahisa, IKESHOJI Toshi-Taka, SUZUMURA Akio

Preprints of the National Meeting of JWS　93　168-169　2013/08/12
Publisher: JAPAN WELDING SOCIETY
DOI： 10.14920/jwstaikai.2013f.0.168.0 　

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はんだ合金のぬれのメカニズムを知るため，コーン・プレート型回転粘度計を用いて，純Snの流動特性を調べた．コーンとプレートの材質はSnと反応しないグラファイトが選択された．その結果，酸化した溶融Snがグラファイトコーンに付着するなどの現象が起き，純Snの酸化が流動特性に及ぼす影響が検出された．
Brazing of C/C composites and Heat Resistance Alloy with Stress Reliefing Interlayer

IKESHOJI Toshi-Taka, TOKUNAGA Tatsuya, SUZUMURA Akio, YAMAZAKI Takahisa

溶接学会全国大会講演概要　93　358-359　2013/08/12
Brazing of C/C composites and Heat Resistance Alloy with Nb Foil Interlayer

IKESHOJI Toshi-Taka, TOKUNAGA Tatsuya, SUZUMURA Akio, YAMAZAKI Takahisa

Preprints of the National Meeting of JWS　92　40-41　2013/03/21
Publisher: JAPAN WELDING SOCIETY
DOI： 10.14920/jwstaikai.2013s.0.40.0 　

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C/C複合材料と耐熱合金インコネル６００をNi-Cr-Fe基ろう材を用いてろう付した．熱膨張係数差による残留熱応力を緩和するためにNb箔を中間財として用いた．ろう付中にNb箔が溶解することにより特異な界面の金属組織の様子を明らかにした．また，Nb箔の厚さとせん断強度の関係を示した．
403 Active metal brazing of C/C composites to heat-resistant alloy using Nb foil interlayer

TOKUNAGA Tatsuya, IKESHOJI Toshi-Taka, SUZUMURA Akio, YAMAZAKI Takahisa

Materials and processing conference　2012　(20)　"403-1"-"403-2"　2012/11/30
Publisher: The Japan Society of Mechanical Engineers

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Carbon-carbon composites were brazed to a Ni-based super-alloy (Inconel 600) using a Fe-Cr-Ni filler metal (TB-2720) with a Nb interlayer at 1080℃ for 300s in vacuum 1.33×10^<-2>Pa {1.0×10^<-4>Torr}. The Nb foil with various thicknesses from 0.1 to 0.5 mm was inserted in the brazing interface to relieve residual stress. The metallurgical microstructure of the brazed joint interface was observed through the scanning electron microscope (SEM). By analyzing with the energy dispersive spectroscopy (EDS), the constituents' distribution at the brazed interface was measured. A crack due to residual stress was formed in the C/C composites near the brazed interface of specimens with thinner Nb foil than 0.2mm. The results suggest that in order to release enough residual stress, the Nb foil must be thicker than 0.2mm. When the foil thickness was 0.5mm, the shear strength of the joint was 9.63MPa.
402 Corrosion Resistance of Austenitic Stainless Steel Braze-Pressure-Welded Joint

IKESHOJI Toshi-Taka, SUZUMURA Akio, YAMAZAKI Takahisa, YAMAGUCHI Mashu

Materials and processing conference　2012　(20)　"402-1"-"402-2"　2012/11/30
Publisher: The Japan Society of Mechanical Engineers

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The braze-pressure-welding was conducted for the SUS316L and SUS304L austenitic steel pipes with various total heating time. The BPW's cleaning step was at 1280℃ with keeping time of 60-360s. The forging process was at 1180℃ with keeping time of 0-60s. For the cross section taken from the parts with distance of 0-20mm from the joint interface, the EPR tests were conducted EPR test was conducted to measure the degree of the sensitization of stainless steel. The cross section on the joint interface, the reactivation value was more than 10% indicating that part was sensitized, on the other parts, the values were lower than 1% and no sign of sensitization was suggested.
414 Heat Transfer Analysis of Friction Joint of Ceramic Whisker Reinforced Aluminum Composites

NAKAGAWA Keisuke, IKESHOJI Toshi-Taka, SUZUMURA Akio, YAMAZAKI Takahisa

Materials and processing conference　2012　(20)　"414-1"-"414-2"　2012/11/30
Publisher: The Japan Society of Mechanical Engineers

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The friction joining of an alumina-whisker-reinforced aluminum matrix composites bar to a zirconia bar was conducted numerically and experimentally. The numerical analysis was the thermal-elastic-plastic analysis solved using the FEM. The heat input in the numerical analysis was calculated from the results of experiment to make the numerical temperature history agree to the experimental values. The obtained principal strain direction distribution showed the circular band. This band shape was observed by optical microscopy as in agreeing with the whisker distribution in the vicinity of the joint interface.
401 Oxidation behavior in stainless steel 316L in AA-TIG welding process

IKEGAMI Toshiya, YAMAZAKI Takahisa, SUZUMURA Akio, IKESHOJI Toshi-taka

Materials and processing conference　2012　(20)　"401-1"-"401-2"　2012/11/30
Publisher: The Japan Society of Mechanical Engineers
826 Improvement in Solderability of Surface Modified graphite

Imoto Akiko, Katori Mana, Ikeshoji Toshi-Taka, Suzumura Akio, Yamazaki Takahisa, Sakamoto Masahiro, Sakimichi Satoshi

Materials and processing conference　2012　(20)　"826-1"-"826-2"　2012/11/30
Publisher: The Japan Society of Mechanical Engineers
825 Surface Modification of Graphite for Graphite/Si Soldering

Katori Mana, Imoto Akiko, Ikeshoji Toshi-Taka, Suzumura Akio, Yamazaki Takahisa, Sakamoto Masahiro, Sakimichi Satoshi

Materials and processing conference　2012　(20)　"825-1"-"825-2"　2012/11/30
Publisher: The Japan Society of Mechanical Engineers
Corrosion Resistivity of Stainless Steel Pipe Joint by Braze Pressure Welding

IKESHOJI Toshi-Taka, SUZUMRUA Akio, YAMAZAKI Takahisa, KATORI Mana, KURODA Keisuke

Summaries of technical papers of annual meeting　91　76-77　2012/09/03
Publisher: Architectural Institute of Japan
ISSN： 1883-9363
C/C複合材料とTiの活性金属ろう付 (特集ろう付を取り巻く最近の状況)

池庄司敏孝

溶接技術 : 社団法人日本溶接協会誌　60　(5)　63-69　2012/05
Publisher: 産報出版
ISSN： 0387-0197
1414 Galvanic corrosion ofj oint between carbon composites and light metals

IKESHOJI Toshi-Taka, Morimoto Tetsuya, SUZUMURA Akio, YAMAZAKI Takahisa

2012　(18)　465-466　2012/03/08
Publisher: The Japan Society of Mechanical Engineers

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The amount of the carbon fiber reinforced plastic (CFRJP) increases in the structure use of the civilian passenger aircraft. But the light weight metals are still widely used in the aircraft structure. So the joint of the CFRP and light weight metals are required. Currently, the most major and practical joint method for CFRP and metals is the rivet fastening. Conventional rivet fasteners' materials for the aerospace use are aluminum alloys and titanium alloys. When the CFRP is fastened to the metals by rivets, the galvanic corrosion is of concern, because the CFRP contains the carbon fiber which has the electric conductivity. In this research, to examine the possibility of galvanic corrosion at the CFRP/metal rivet joint, the polarization potential was measured for the pure titanium and the CFRP in the 5wt%NaCl aqueous solution. The polarization potential was recorded for 24 hours. But the current was almost none. The passive layer of the titanium is considered to prevent the corrosion in the NaCl aqueous solution.
G040014 Detection of solution for stainless steel elements into Sn-Bi solder bath using the viscometer.

NISHIYAMA Maki, YAMAZAKI Takahisa, IKESHOJI Toshi-Taka, SUZUMURA Akio

Mechanical Engineering Congress, Japan　2011　"G040014-1"-"G040014-5"　2011/09/11
Publisher: The Japan Society of Mechanical Engineers

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Erosion and Corrosion damage of stainless steel is caused by a molten lead-free solder in reflow and flow soldering bath. This phenomenon influences the operation periods and replacing timing of the components. Viscosity measurements of the molten Sn-Bi solder in carbon cell had been carried out to detect the change of rotation torque of stainless steel 304 cone plate with dissolving into the solder. The operation temperature was 160 degree Celsius, and shear speed was 105.6 rpm. An increase of rotation torque was observed about 200 min after from dipping of the cone plate into molten solder. After the viscosity test, a scanning electron microscope equipped with EDX observation of the surface of stainless steel cone plate contacted with the solder had been carried out. In the observed area of the plate, Sn and Bi elements could not be found out. Thus, this phenomenon was caused by elution of Fe elements of stainless steel into Sn, and it was identified with the increase of the liquids line of the tested solder. In addition, we tried to discuss about interface energy of cluster model calculated by Fermi energy because of the view viscosity is related to of their value of interface energy.
G040013 Brazing of C/C Composites with Ni-based Heat Resistance Alloys with Active Brazing Fillers

IKESHOJI Toshi-Taka, AMANUMA Tetsutaro, SUZUMURA Akio, YAMAZAKI Takahisa

Mechanical Engineering Congress, Japan　2011　"G040013-1"-"G040013-2"　2011/09/11
Publisher: The Japan Society of Mechanical Engineers

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Carbon/carbon composites plate is brazed to Ni-base super alloy, Inconel 600 using Fe-Cr base brazing filler. The Fe-Cr base brazing filler slurry was pasted on the C/C composites surface. The brazed surface of C/C composites was the cross section of laminates to make the residual thermal stress induced by the mismatch in the coefficient of thermal expansion. The brazing temperature was 1,050°C and the keeping time was 300s. The cooled specimen had crack just below the brazing interface inside of C/C composites. But the observation of microstructure revealed the sound bonding between the brazing filler layer and C/C composites. The Ni-base super alloy seemed to experience the dissolve and solidification process during the brazing. The diffusion of P in the Fe-Cr base alloy took the major role in formation of the microstructure.
Assessment of sensitization properties on SUS304 and SUS316L stainless steel pipe Joints made by Braze-Pressure-Welding

KURODA Keisuke, IKESHOJI Toshi-Taka, SUZUMURA Akio, YAMAZAKI Takahisa

89　296-297　2011/08/18
Braze Pressure Welding with Partial Atmospheric Method for Stainless Steel Piping

KATORI Mana, IKESHOJI Toshi-Taka, SUZUMURA Akio, YAMAZAKI Takahisa, KURODA Keisuke

89　294-295　2011/08/18
Active metal brazing of heat resisting super alloy to C/C composites

AMANUMA Tetustaro, IKESHOJI Toshitaka, SUZUMURA Akio, YAMAZAKI Takahisa

89　300-301　2011/08/18
Quadrupole mass spectrometer analysis of pyrolysis gases from diamond with through lamp heat for joining to metal ring

SAKAGUCHI Shuji, YAMAZAKI Takahisa, IKESHOJI Toshitaka, SUZUMURA Akio

89　302-303　2011/08/18
Hydrogen Permeation Device by Diffusion Bonding to Palladium Foil and SUS304 Stainless Steel

IKESHOJI Toshi-Taka, SUZUMRUA Akio, YAMAZAKI Takahisa

89　304-305　2011/08/18
Micro structure oxide-containing and hardness in solidification end of 316L stainless steel bead by AA-TIG welding

IKEGAMI Toshiya, YAMAZAKI Takahisa, IKESYOJI Toshi-Taka, SUZUMURA Akio

89　14-15　2011/08/18
Diffusion Bonding Process

IKESHOJI Toshi-Taka, MAEDA Masakatsu

Journal of the Japan Welding Society　80　(5)　447-449　2011/07/05
Publisher: 溶接学会
ISSN： 0021-4787
Effect of ZnCl_2 Concentration in Flux to In-The-Air Brazing of Al Alloys/SUS304 Stainless Steel

IKESHOJI Toshi-Taka, UENO Takashi, SUZUMURA Akio, YAMAZAKI Takahisa

88　44-45　2011/03/28
210303 Improvement in toughness of diffusion-bonded joint of hard and brittle material by phase transformation of its microstructure

NIWAYA Kazuhiro, IKESHOJI Toshi-Taka, SUZUMURA Akio, YAMAZAKI Takahisa, YODA Satoko

2011　(17)　329-330　2011/03/17
Publisher: The Japan Society of Mechanical Engineers

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In general, the diffusion-bonded joint of hard and brittle materials has the low impact resistance. The grain-boundary arranged flatly near the former mating surface is considered to suppress the toughness of the diffusion-bonded joint. In order to improve its impact resistance, the phase-transformation was deliberately induced to encourage the displacement of the grain-boundary at the bonding interface. The tool steel (SKD61 in JIS) square bars were diffusion-bonded at higher temperature than the austenitizing temperature, followed by the various heat treatment to induce the martensitic, bainitic and pearlitic transformations. By the martensitic transformation after the diffusion bonding process, the joints had the comparable Charpy impact value with the bulk material which experienced the same heat treatment. The optical observation of the microstructure revealed that the flat grain-boundary was vanished due to the growth of the martensitic microstructure. The results showed the effectiveness of the successive phase transformation process just after the diffusion bonding process.
210305 Infiltration of Active Brazing Filler During Brazing of C/C Composites

IKESHOJI Toshi-Taka, AMANUMA Tetsutaro, SUZUMURA Akio, YAMAZAKI Takahisa

2011　(17)　333-334　2011/03/17
Publisher: The Japan Society of Mechanical Engineers

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For the future construction of the large scale space platform on the earth orbit, the structural engineering materials with the high specific strength and modulus is required to braze in space. The combination of carbon/carbon composites and titanium is one of those candidates. In the brazing process of the combination, the infiltration of the brazing filler occurs and it is harmful to the joint's characteristics. In this research, a 2-D laminated C/C composites plates with cross-ply angle of [0°/90°]S, [+45°/-45°]S and [30°/-60°]S were prepared. They were brazed to pure titanium tablet in the vacuum using the active brazing filler of Ag-32.25Cu-1.75Ti at 830℃ for 300s. The shear strength of the brazed joint was measured by the tensile shear rupture test. All of the obtained joints were fractured at the bulk C/C composites. On the case of [0°/90°] cross-ply laminated C/C composites, the shear strength reached to the maximum value up to 24MPa. The cross sections of the brazed joints were observed by optically and through SEM. The brazing filler was infiltrated along the fiber. The infiltrated brazing filler was not acted as anchors but the crack initiation points.
Shear Strength of Brazed Joint Between Titanium and C/C Composites With Various Cross-Ply Angles

IKESHOJI Toshi-Taka, AMANUMA Tetsutaro, SUZUMURA Akio, YAMAZAKI Takahisa

Journal of Solid Mechanics and Materials Engineering　5　(12)　1022-1028　2011
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jmmp.5.1022 　

ISSN： 1880-9871

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For the future construction of the large scale space platform on the earth orbit, the high specific strength and modulus engineering materials will be required to braze in space. In this research, the combination of carbon/carbon composites and titanium is chosen and it is investigated that the effect of the cross-ply angle to the brazing interface to the shear strength and the microstructure at the brazing interface. A 2-D laminated C/C composites plates with cross-ply angle of [0°/90°]S, [+45°/-45°]S and [30°/-60°]S were prepared. They were brazed to pure titanium tablet in the vacuum using the active brazing filler of Ag-32.25Cu-1.75Ti at 830°C for 300s. The shear strength of the brazed joint was measured by the tensile shear rupture test. All of the obtained joints were fractured at the bulk C/C composites. On the case of [0°/90°] cross-ply laminated C/C composites, the shear strength reached to the maximum value up to 24 MPa.
432 Effect of fiber lamelar direction of C/C composites to brazing of C/C composites and titanium alloys with active brazing filler

IKESHOJI Toshi-Taka, AMANUMA Testutaro, SUZUMURA Akio, YAMAZAKI Takahisa

Materials and processing conference　2010　(18)　"432-1"-"432-2"　2010/11/27
Publisher: The Japan Society of Mechanical Engineers

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There are difficulties to obtain the sound joint by brazing of the carbon-fiber-reinforced carbon (CFC) composites and refractory metals. Those difficulties are caused by the CFC composites' strong anisotropy in mechanical properties, especially in the thermal expansion coefficient. In this research, the proper orientation of CFC composites to the brazing interface is investigated. A cross-ply laminate CFC composites plate was cut with various angles to the fiber direction. Their end faces were perpendicular to the laminate direction. The end face was brazed to pure titanium disk in the vacuum. The active brazing filler of Ag-32.25Cu-1.75Ti (Cusil-ABA[○!R], Wesgo Metals) was used. The brazing temperature was at 830℃, and the keeping time was 300s. For the brazed joint, the tensile joint strength and the shear joint strength were measured. When the angle of fiber direction and the brazing interface was 45℃, the joint tensile joint strength reached to the maximum value. So did the shear strength of the brazed joint.
424 Effect of metal element diffusion during manufacturing hydrogen purifier device by Pd/SUS304 diffusion bonding

YODA Satoko, IKESHOJI Toshi-Taka, SUZUMURA Akio, YAMAZAKI Takahisa

Materials and processing conference　2010　(18)　"424-1"-"424-3"　2010/11/27
Publisher: The Japan Society of Mechanical Engineers

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The ultra-thin palladium membrane was diffusion-bonded with the austenitic stainless steel SUS304 disks at various temperature and with the bonding time of 1,800s under the pressure of 0.2 MPa. The cross sections of the joined interface were examined using FE-SEM. The element distribution showed that the counter diffusion between the Pd membrane and SUS304 austenitic stainless steel was not occurred apparently at the bonding temperature of 1,000℃. But at 1,100℃, the counter diffusion made the Pd membrane totally change into the intermetallic compound. According to the results, the nominal diffusion coefficient of Pd/SUS304 was obtained.
431 Assessment of Sensitization of Braze-Pressure-Welding Joint of Austenitic Stainless Steel

KURODA Keisuke, IKESHOJI Toshi-Taka, SUZUMURA Akio, YAMAZAKI Takahisa

Materials and processing conference　2010　(18)　"431-1"-"431-2"　2010/11/27
Publisher: The Japan Society of Mechanical Engineers

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It was investigated that effect of the thermal history during the braze-pressure-welding process for the austenitic stainless steel to its sensitization property. The SUS304 austenitic stainless steel pipes were joined using the braze-pressure-welding method with the induction heating. The cleaning metal, or insert metal, was the Fe-base alloy (Fe(Bal.)-20Cr-l0Ni-3Si- 2.5B-1Mo). For the cross section samples of the pipe wall with various distance from the joint interface, the degree of the sensitization was measured using the EPR method. The grain size of the samples was also measured to modify the degree of the sensitization. The value of the sensitization was high at the vicinity of the joint interface, but it dropped with the distance. It was shown that the severe sensitization did not occur by the BPW process.
Brazing of cross-ply laminated C/C composites and Ti alloy with active brazing filler and lamination angle

87　134-135　2010/08/18
Diffusion bonding of Pd membrane and stainless steel

YODA Satoko, IKESHOJI Toshi-taka, SUZUMURA Akio, YAMAZAKI T

87　230-231　2010/08/18
Suppression of Sensitization of Stainless Steel Braze-Pressure Welding by Induction Heating

IKESHOJI Toshi-taka, SUZUMURA Akio, YAMAZAKI T Takahisa

87　238-239　2010/08/18
Joining of diamond to Fe-42Ni alloy using Zn-5Al solder with Ultrasonic vibration

YAMAZAKI Takahisa, SUZUMURA Akio, IKESHOJI Toshi-Taka, KOIKE Junki

87　342-343　2010/08/18
The Influence of Gap Clearance to Joint Strength of Four-Pipe Brazed Specimen for Rocket Nozzle Skirt Assy

AMANUMA TETSUTARO, IKESHOJI TOSHI-TAKA, SUZUMURA AKIO, YAMAZAKI TAKAHISA

86　6-7　2010/03/29
Influence of Concentration of ZnCl_2 in Flux to Wettability of Al-Si Brazing Filler on SUS304 Stainless Steel

UENO Takashi, IKESHOJI Toshi-Taka, SUZUMURA Akio, YAMAZAKI Takahisa

86　8-9　2010/03/29
Influence of ply direction to brazed joint of C/C composites and pure titanium

IKESHOJI Toshi-Taka, KUNIKA Nariaki, SUZUMURA Akio, YAMAZAKI Takahisa

86　4-5　2010/03/29
Effect of hydrogen permeation on structure and hardness of SUS316L welded by A-TIG

YAMAZAKI Takahisa, KAMONO Shumpei, SUZUMURA Akio, IKESHOJI Toshi-Taka

86　82-83　2010/03/29
Brazing of C/C composites and titanium alloys with inserting OFHC copper foil

IKESHOJI T.-T.

DVS　263　23-28　2010
142 Active metal brazing of C/C composites to the titanium alloy

KUNIKA Nariaki, IKESHOJI Toshi-Taka, SUZUMURA Akio, YAMAZAKI Takahisa

Materials and processing conference　2009　(17)　"142-1"-"142-2"　2009/11/06
Publisher: The Japan Society of Mechanical Engineers

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Carbon-carbon composites were brazed to a pure titanium using a Ag-Cu-Ti filler metal (Cusil-ABA^<[○!R]>) at 830℃ for 60s or 300s in vacuum of 1.0×10^<-4> Torr. The microstructure of the brazed joint interface was observed through the optical microscope and the scanning electron microscope (SEM). By analyzing with the energy dispersive spectroscopy (EDS), the constituents' distribution at the brazed interface was measured. Those observations and analyses revealed that the yarns of C/C composites were disbanded into the carbon fibers, and that the carbon fibers were corroded. The titanium included not only in the brazing filler metal but also in the bulk metal which diffused into the molten brazing filler metal formed the carbide to corrode the C/C composites. The corrosion was more severe for the brazed joint made by a longer brazing time. These results suggest that the brazing time must be shorter to obtain the stronger brazed joint for C/C composites and titanium.
133 Micro mechanical joining for fixing of ultra fine copper thread on electronic terminal

SHIMOTAKE Kouichi, SUZUMURA Akio, IKESHOJI Toshi-Taka, YAMAZAKI Takahisa

Materials and processing conference　2009　(17)　"133-1"-"133-2"　2009/11/06
Publisher: The Japan Society of Mechanical Engineers

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The downsizing of the electronic devices has been achieved by downsizing of the electronic power modules and the circuits for high-frequencies. Those modules require the more miniaturizations in the solenoid parts, e,g, choke coil, or transformer. The so-called micro solenoids are expected to be made by winding the ultra-fine electronic wire with diameter of several tens of micrometers. But the ultra-fine electronic wire has less tensile and bending strength and melt during the conventional soldering process. Therefore, besides the ultrasonic bonding and the soldering, a new fixing method is developed for the ultra-fine electronic wire. The proposed method is called the micro-mechanical joining, by which the ultra-fine wire is mechanically held to the electronic terminal. The detailed method including the shape of the terminal and the protocol is described in this article. The smallness in the wire distortion is shown. The joint strength tests are conducted and the enough strength comparable to that of the base metal wire is obtained.
Effect of Nickel-Iron Mixture of Weld Metal on Hydrogen Permeability at Various Temperatures in 316L Stainless Steel

Takahisa Yamazaki, Toshi-Taka Ikeshoji, Akio Suzumura, Daigo Kobayashi, Kamono Shumpei

Journal of Solid Mechanics and Materials Engineering　3　(6)　865-875　2009

DOI： 10.1299/jmmp.3.865 　

ISSN： 1880-9871
Effect of a Nickel-Iron Mixture of Weld Metal on Hydrogen Permeability at Various Temperatures in 316L Stainless Steel

YAMAZAKI Takahisa, IKESHOJI Toshi-Taka, SUZUMURA Akio, KOBAYASHI Daigo, KAMONO Shumpei

Journal of Solid Mechanics and Materials Engineering　3　(6)　865-875　2009
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jmmp.3.865 　

ISSN： 1880-9871

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It is important to prevent from hydrogen embrittlement cracking in the heat-affected zone of welded steels. The hydrogen permeation rate for bulk nickel at high temperatures is higher than that of stainless steel, although the reverse is true at low temperatures. Low carbon stainless 316L steel, which contained 12-15% nickel, was selected as the parent material for welding. We have investigated the affect of nickel near the heat-affected zone by measuring the hydrogen permeation at various temperatures. We performed hydrogen permeation tests into the bead on plate specimens using nickel filler. A stationary hydrogen gas flux through the stainless steel specimen was measured by using an orifice and a quadrupole mass spectrometer (QMS). The partial pressure difference for hydrogen that was applied to the specimen was able to be kept constant by maintaining a constant gas flow rate through the orifice in a low- pressure room. An orifice with a 3 mm diameter maintained stationary steady-state hydrogen gas flux from the specimen at 620K, while a 1.2 mm diameter orifice maintained the steady pressure at 520 K. The hydrogen permeability, K was calculated based on the measured steady-state hydrogen gas fluxes at various temperatures. These results plotted as log K versus 1/T (reciprocal temperature) could not be interpolated linearly. The permeability values of the specimen at 570 K and 520 K were less than interpolated ones between the value at 620 K and the value at 520K of the 316 L stainless steel substrate as received.
445 Active metal brazing of Ti to C/C composites

KUNIKA Nariaki, IKESHOJI Toshi-Taka, SUZUMURA Akio, YAMAZAKI Takahisa

Pre-Prints of the National Meeting of JWS　(83)　402-403　2008/08/20
Publisher: Japan Welding Society
242 Survey on hydrogen permeation paths in stainless steel SUS304 welded by TIG

KAMONO Shumpei, YAMAZAKI Takahisa, SUZUMURA Akio, IKESHOJI Toshi-Taka

Pre-Prints of the National Meeting of JWS　(83)　166-167　2008/08/20
Publisher: Japan Welding Society
航空宇宙産業におけるろう付けの実用技術

池庄司敏孝

ツールエンジニア　49　(1)　63-65　2008
137 Microstructure, Strength and Corrosion Resistance of Braze Pressure Welded Joint of Stainless Steel Pipe

Suzumura Akio, Yoshii Kazuya, Ikeshoji Toshi-Taka, Yamazaki Takahisa

Materials and processing conference　2007　(15)　87-88　2007/11/16
Publisher: The Japan Society of Mechanical Engineers

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The braze pressure welding (BPW) of the austenitic stainless pipe is conducted under the various joining condition with various filler metal; two Fe-based filler metals, four Ni-based filler metals and their mixture are used. With CR3B Fe-based filler metal, the metallographic observation and the elemental analysis reveal the formation of sound joint. This joint has the enough tensile strength demanded for the commercial standard. The distribution of Cr around the joint interface is not uniform, which might lower the corrosion resistance. The mixture of filler metals forms the residual layer in the joint interface which weakens the joint. The higher joining pressure and the uniformity of the temperature distribution around the joint interface contribute to the formation of sound joint. The usage of Fe-based filler metal with richer Cr and Mo as minor element and the higher joining pressure is considered to provide the better condition.
140 Investigation of Interfacial Energy of Sn-Bi Solder-melt with respect to Viscosity

Kayama Gaku, Yamazaki Takahisa, Ikeshoji Toshi-Taka, Suzumura Akio

Materials and processing conference　2007　(15)　93-94　2007/11/16
Publisher: The Japan Society of Mechanical Engineers

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We suppose an idea to estimate wettability of solder. It assumes that solder-melt form some clusters in solidification process. Wettability of solder was estimated by calculating an interfacial energy of the cluster, and viscosity was reported on the experimental results for verifying this idea. Viscosity of Sn-Bi solder was measured at temperature range from 150℃ to 210℃. The results that the characteristics of Sn-Bi solder as dilant fluid decreases with temperature increased at temperature range from 150℃ to 155℃ were obtained. Above 155℃, the characteristics of the solder melt became as Newton fluid. These results indicates that the clusters are recognized in the Sn-Bi solder-melt at temperatures between 150 and 155℃.
205 Relation between fraction of metallizing surface over diamond surface and coherent interface of ionic product

ISHIGURO Toru, YAMAZAKI Takahisa, SUZUMURA Akio, IKESHOJI Toshi-Taka

Pre-Prints of the National Meeting of JWS　(81)　90-91　2007/09/01
Publisher: Japan Welding Society
431 NCD powder existence survey in the NCD dispersed a-C:H film of 1μm thick made by CVD coating

GOTO Kunio, YAMAZAKI Takahisa, SUZUMURA Akio, IKESHOJI Toshi-Taka, KAWAHATA Akira

Materials and processing conference　2006　(14)　279-280　2006/11/25
Publisher: The Japan Society of Mechanical Engineers

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Nano cluster diamond (NCD) dispersed amorphous hydrogenated carbon (a-C:H) film was formed 440C stainless steel using radio frequency (RF) plasma chemical vapor deposition (CVD) method. For 5-hours coating with the applied bias voltage changed, the formed film became 5 times as thick as that coated for 1 hour. The distribution of NCD in the film's depth was surveyed by the glow discharge optical emission spectrometry profiling. Two strain gauge sensors that put on a thin spherical shell equipped with reciprocal sliding tester detect the difference of the strains in sliding directions. The pin-on-disk test using these sensors was performed to examine the lubricity on the surface.
228 Development of interlayer metal suitable for Braze Pressure Welding using induction heating for joining of stainless steel pipes

SUZUMURA Akio, CHIGISAKI Shuntaro, IKESHOJI Toshitaka, YAMAZAKI Takahisa

Materials and processing conference　2006　(14)　123-124　2006/11/25
Publisher: The Japan Society of Mechanical Engineers

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Braze Pressure Welding (BPW) with high frequency induction heating is a newly developed pressure welding technique using brazing filler as interlayer metals for welding the general steel pipes for pipe arrangement in buildings. In this report, stainless steel pipes were joined by BPW with some kinds of interlayer metals, and the joint of the pipes made by BPW were evaluated by microscopy, element profiles and tensile strength of the joints in order to determine the suitable interlayer metal for BPW of stainless steel pipes. As the result of this research, the BPW joint using BNi-2 as interlayer metal was stronger with less melting of base metal than that of the BNi-5. A newly developed Fe-base interlayer metal was also suitable for BPW of stainless steel pipes.
229 Improvement of brazeability of dissimilar joints of aluminum alloys to stainless steel in the air

LIU shuying, SUZUMURA Akio, IKESHOJI Toshi-Taka, YAMAZAKI Takahisa

Materials and processing conference　2006　(14)　125-126　2006/11/25
Publisher: The Japan Society of Mechanical Engineers

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In order to investigate the reason why the brazing of dissimilar metals between aluminum alloys and stainless steel in the air, the brazing of various aluminum alloys to stainless steel were carried out using Al-Si brazing filler and the behavior of brazed interface was examined. As the result, the cause to make the brazing difficult is shown that the brazing filler is rapidly solidified isothermally due to the invasion of Zn into the brazing area from the flux, before the wetting of the brazing filler to stainless steel. Based on these phenomena, the two types of new joining method that brazing could be made were suggested and the practical applicability was tried.
222 Research on micro mechanical joining for fixing of fine copper line on electrical terminal

SUZUMURA Akio, NODA Takuya, IKESHOJI Toshi-Taka, YAMAZAKI Takahisa

Materials and processing conference　2006　(14)　111-112　2006/11/25
Publisher: The Japan Society of Mechanical Engineers

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The more miniaturization is demanded from electronic parts as microelectronics develops, and the electric wire that composes them is thinner. However, there is a difficulty to connect electric wire and the terminal, because thin electric wire is breakable and melting easily. In these cases, such a joining method is effective as the plastic deformation is used and wrapped about the joint part on the terminal side by giving neither the transform nor heating such an electric wire, and to call this micro joining technology based on a new conception the micro mechanical joining method. In this paper, it was found that micro mechanical joining can fix the electric wire by plastic deformation experiment and FEM analysis.
Relation between joint strength and reaction products at the soldered interface of diamond

YAMAZAKI Takahisa, SUZUMURA Akio, IKESHOJI Toshi-Taka, SHIMIZU Osamu

79　434-435　2006/09/01
Effect of Isothermal Solidification Behavior of Al-Si Brazing Filler Layer on the Braze-ability of Al-Alloy to Stainless Steel in the Air

IKESHOJI Toshi-Taka, LIU Shuying, SUZUMURA Akio, YAMAZAKI Takahisa

quarterly journal of the Japan Welding Society　24　(4)　362-367　2006
Publisher: Japan Welding Society
DOI： 10.2207/qjjws.24.362 　

ISSN： 0288-4771

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In order to clarify such brazing conditions for making sound joints of Al-alloys to stainless steel as to wet the Al-Si brazing filler on the stainless steel before rapid isothermal solidification of the filler, the solidification time is estimated by the numerical analysis and is also measured experimentally. The numerical analysis is conducted for the brazing process of the A1050 pure aluminum base metal and BA4045 aluminum-silicon brazing filler. The analysis contains both the initial dissolution of the base metal by the molten brazing filler and the following isothermal solidification behavior. The movement of the solid-liquid interface is calculated and the total solidification time is estimated. The brazing experiment between the same combination of metals shows the total solidification time is much less than the numerically estimated time. The element analysis by EPMA indicates that the zinc in the flux plays the dominant role in the brazing process. According to the results, the time to solidify the brazing filler layer is 30×10^<-3>H^2 s, where H is the initial brazing filler layer width in μm. To obtain the brazed joint between the Al alloys and stainless steel, the initial brazing filler layer of at least 30μm and the holding time of at least 30 s at the brazing temperature are considered to be suitable for the brazing.
Effect of oxide film on the reduction of hydrogen permeation rate in stainless steel

T Yamazaki, TT Ikeshoji, A Suzumura, T Naito

JSME INTERNATIONAL JOURNAL SERIES A-SOLID MECHANICS AND MATERIAL ENGINEERING　49　(1)　58-62　2006/01

DOI： 10.1299/jsmea.49.58 　

ISSN： 1344-7912
Effect of fillet geometry to joint strength of four-pipe-brazed specimen for rocket nozzle skirt

TT Ikeshoji, A Suzumura, T Yamazaki

JSME INTERNATIONAL JOURNAL SERIES A-SOLID MECHANICS AND MATERIAL ENGINEERING　48　(4)　406-412　2005/10

DOI： 10.1299/jsmea.48.406 　

ISSN： 1344-7912
Solubility and dissolution rate of Ni base alloy to molten Ag-Cu-Pd brazing filler

TT Ikeshoji, Y Watanabe, A Suzumura, T Yamazaki

JSME INTERNATIONAL JOURNAL SERIES A-SOLID MECHANICS AND MATERIAL ENGINEERING　48　(4)　346-351　2005/10

DOI： 10.1299/jsmea.48.346 　

ISSN： 1344-7912
Cleaning effect of interlayer metal on the joining surface during braze pressure welding

Y Inagaki, A Suzumura, TT Ikeshoji, T Yamazaki

JSME INTERNATIONAL JOURNAL SERIES A-SOLID MECHANICS AND MATERIAL ENGINEERING　48　(4)　413-419　2005/10

DOI： 10.1299/jsmea.48.413 　

ISSN： 1344-7912
Brazing of stainless steel to various aluminum alloys in air

SY Liu, A Suzumura, TT Ikeshoji, T Yamazaki

JSME INTERNATIONAL JOURNAL SERIES A-SOLID MECHANICS AND MATERIAL ENGINEERING　48　(4)　420-425　2005/10

DOI： 10.1299/jsmea.48.420 　

ISSN： 1344-7912
418 Effect of joining pressure on the joint properties of YBCO bulk superconductor

Suzumura Akio, Ozaki Hideyuki, Ikeshoji Toshi-Taka, Yamazaki Takahisa, Tsunekawa Hajime

Pre-Prints of the National Meeting of JWS　(77)　352-353　2005/08/20
Publisher: Japan Welding Society
316 Wettability improvement of diamond in soldering by Sn-In-Al-Si-V

Yamazaki Takahisa, Shimizu Osamu, Suzumura Akio, Ikeshoji Toshi-Taka, Yamada Shintaro

Pre-Prints of the National Meeting of JWS　(77)　228-229　2005/08/20
Publisher: Japan Welding Society
318 Numerical Analysis of Diffusion of Solute into Base Metal during Solidification Process in Brazing Filler Layer of Aluminum Alloys Brazing

IKESHOJI Toshi-Taka, LIU Shuying, SUZUMURA Akio, YAMAZAKI Takahisa

Pre-Prints of the National Meeting of JWS　(77)　232-233　2005/08/20
Publisher: Japan Welding Society
3. Solid State Joining Process(2004 Trend of Welding & Joining in Japan)

SATONAKA Shinobu, TAKAHASHI Makoto, IKESHOJI Toshitaka, SATO Yutaka

Journal of the Japan Welding Society　74　(5)　296-303　2005/07/05
Publisher: Japan Welding Society
ISSN： 0021-4787
固相接合プロセス

里中忍, 高橋誠, 池庄司敏孝, 佐藤裕

溶接学会誌　74　(5)　72-79　2005
Cleaning Effect of Interlayer Metal on the Joining Surface during Braze Pressure Welding

INAGAKI Yohei, SUZUMURA Akio, IKESHOJI Toshi-Taka, YAMAZAKI Takahisa

JSME International Journal Series A　48　(4)　413-419　2005

DOI： 10.1299/jsmea.48.413 　

ISSN： 1344-7912
Brazing of Stainless Steel to Various Aluminum Alloys in Air

LIU Shuying, SUZUMURA Akio, IKESHOJI Toshi-Taka, YAMAZAKI Takahisa

JSME International Journal Series A　48　(4)　420-425　2005

DOI： 10.1299/jsmea.48.420 　

ISSN： 1344-7912
Effect of Fillet Geometry to Joint Strength of Four-Pipe-Brazed Specimen for Rocket Nozzle Skirt

IKESHOJI Toshi-Taka, SUZUMURA Akio, YAMAZAKI Takahisa

JSME International Journal Series A　48　(4)　406-412　2005

DOI： 10.1299/jsmea.48.406 　

ISSN： 1344-7912
Comparison between brazing properties of stainless steel to various aluminium alloys

SUZUMURA Akio, LIU Shuying, IKESHOJI Toshi-Taka, Yamazaki Takahisa

Materials and processing conference　2004　(12)　299-300　2004/11/05
Publisher: The Japan Society of Mechanical Engineers

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Brazing of stainless steel to various aluminium alloys had been carried out using Al - Si filler and flux in air. The brazing properties changed remarkably with kinds of aluminium alloy. Also in the aluminium alloy of the same kind, brazing property changed remarkably by the change of a slight temperature. It was considered that these phenomena are due to the composition of base metals and the filler metal, the difference in the surface structure, and also the melting and solidification behavior by the reaction between the aluminium alloy base metal and the filler.
Behavior of Interlayer in BPW Joint with High Frequency Induction Heating

INAGAKI Yohei, SUZUMURA Akio, YAMAZAKI Takahisa, IKESHOJI Toshi-Taka

Materials and processing conference　2004　(12)　307-308　2004/11/05
Publisher: The Japan Society of Mechanical Engineers

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Braze Pressure Welding (BPW) had been invented as the new joining method for the ordinary steel piping. BPW is the pressure welding with high frequency induction heating using the brazing filler as the interlayer metals. In the general idea of BPW, the liquid interlayer metals clear the joining surfaces, which are considered to be covered with the contamination layer of the oxide films and so on. The joining pressure discharges the liquid interlayer metals involving the oxide films from the joining interfaces. In addition, it forms the fillets around the joint. The base metals with cleared joining surfaces are pressure-welded by the relatively low joining pressure. Thus in BPW, the interlayer metals play an important role in welding the high performance joint. In this paper, the clearing property of the interlayer metals on the joining surfaces for clarifying the joining phenomenon was discussed. It was confirmed by the observation of the clearing effect, and the discharge of the inclusions produced by oxide films by the interlayer metals and the miniaturization of the inclusions by optical microscope and the EPMA analysis.
Joint strength of 4-pipe-brazed specimen for rocket nozzle skirt wall

IKESHOJI Toshi-Taka, SUZUMURA Akio, YAMAZAKI Takahisa

Materials and processing conference　2004　(12)　295-296　2004/11/05
Publisher: The Japan Society of Mechanical Engineers

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The 4-pipe-barzed specimen is used to obtain the strength of the brazed joint of the rocket nozzle skirt wall, which is made by the pipe works joined by brazing. The influence of the fillet shape to the strength of the 4-pipe-brazed specimen is numerically estimated by the finite element method with the non-linear static elastic-plastic analysis. The fillet shape is represented by the apparent fillet width and the clearance between the pipes. As far as the variation of the shape assumed in this research, the von Misee' equivalent stress in the fillet reaches to its tensile strength by the smaller nominal strain than the pipe, and rupture might always occur at the fillet. For the constant apparent fillet width of 1.0 and 2.0mm, the maximum nominal strain to rupture has the smaller extreme at clearance of 200μm.
Heat Analysis in Friction Welding Joint of Stainless Steel

IKESHOJI Toshi-Taka, DEMURA Nobuhiro, SUZUMURA Akio, YAMAZAKI Takahisa

Materials and processing conference　2004　(12)　311-312　2004/11/05
Publisher: The Japan Society of Mechanical Engineers

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The temperature field during the friction welding process is numerically estimated. The friction welding process of SUS304 stainless steels is analyzed using the finite element method. The heat coefficient A_l is proposed for the frictional heating: q_o=A_l(3Q)/(4πR^6)r. The A_l value is deduced from the experimentally obtained temperature history of several points on the specimen's surface. The heat input surface is translated with time evolution to reflect the discharge of the weld flush from the joining interface. To decide the A_l value and the translation length of the heat input surface, the frictional joining experiment is conducted for SUS304 stainless steel bars, and the temperature history and the compression length of the specimen are measured. The obtained A_l values are varied with time. By using the Ai values and the compression length as the translation length of the heat input surface, the precisely identical temperature distribution can be calculated.
Erosion of base metal by Marangoni convection of molten Pd-based brazing filler metal

IKESHOJI Toshi-Taka, SUZUMURA Akio, YAMAZAKI Takahisa

Materials and processing conference　2004　(12)　305-306　2004/11/05
Publisher: The Japan Society of Mechanical Engineers

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The erosion of Ni baaed alloy substrate to the convection of the molten 54mas8%Ag-21ma88%Cu-25masB%Pd (BPd-6) brazing filler metal is numerically analyzed. During the brazing process using BPd-6 with organic binder, the binder is heated by radiation to form the slag floating on the molten brazing filler metal surface. The slag becomes the heat spot which might induce the Marangoni convection of the molten brazing filler metal. The numerical analysis of flow and temperature fields of the molten brazing filler metal reveals that the Marangoni convection occur on the case of the slag temperature of 1,050℃ and 1,010℃ on the 1,000℃ molten BPd-6. The flow is the well-up type around the slag. The substrate is considered to be eroded by the combination of the metallurgical dissolution and the Marangoni convection. The eroded pif s depth is quantitatively estimated from the total flux of the molten BPd-6 flown over the substrate surface is quantitatively.
209 Brazed-Pipes Joint Strength of Brazed-Pipes Specimen for Rocket Engine Nozzle Skirt and Their Clearance between the Pipes

IKESHOJI Toshi-Taka, SUZUMURA Akio, YAMAZAKI Takahisa

Pre-Prints of the National Meeting of JWS　(75)　82-83　2004/08/20
Publisher: Japan Welding Society
205 The effects of the oxide film at the joining interface on the weldability of BPW joint

INAGAKI Yohei, SUZUMURA Akio, IKESHOJI Toshi-Taka, YAMAZAKI Takahisa

Pre-Prints of the National Meeting of JWS　(75)　74-75　2004/08/20
Publisher: Japan Welding Society
237 Characteristics Change of Hydrogen Permeation in Stainless Steel Plate by Surface Modification

Yamazaki Takahisa, Ikeshoji Toshi-Taka, Suzumura Akio, Yamada Ikuhisa, Koga Yusuke, Hirose Hisayuki

Pre-Prints of the National Meeting of JWS　(75)　138-139　2004/08/20
Publisher: Japan Welding Society
The analysis of the fillet formation effects in the braze-pressure-welding of general steel pipes with high frequency induction heating

SUZUMURA Akio, INAGAKI Yohei, IKESHOJI Toshitaka, YAMAZAKI Takahisa

Materials and processing conference　2003　(11)　331-332　2003/10/17
Publisher: The Japan Society of Mechanical Engineers

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The Braze-Pressure-Welding with induction heating (BPW) has been developed as a new welding method for joining ordinary steel pipes. In the BPW, a brazing filler interlaid between the mating surfaces melts at the joining temperature, then it is discharged from the joining interface by the welding pressure. The base metals are pressure-welded to each other, and the fillets are formed around the joining area by the discharged filler metals. In the previous papers, it was confirmed that the fillets made only at the outer side of joint area of pipes could relax the stress concentration by finite element analysis. In this paper, it was revealed that the even small fillets made at the both sides of joint area of pipes can relax the stress concentration, and that the fillet transfers the maximum stress site from the edge of the joining interface to the touching point of the fillet and the base material.
Fractal Dimension of Ductile fractured surface simulated using dimple size distribution

IKESHOJI ToshiTaka, SUZUMURA Akio

Materials and processing conference　2003　(11)　323-324　2003/10/17
Publisher: The Japan Society of Mechanical Engineers

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Fractal dimension for the ductile fractured surface ruptured at the joint interface is investigated. The simple relationship between the fractal dimension and the dimple size frequency distribution function has been shown analytically as D=α/2. To validate the analytical relationship, the surface profiles of the dimple covered ductile surfaces are virtually formed and their fractal dimension values are calculated. The size distribution of the dimples contained in the formed surface profile is subjected to the power function of the dimple size. Those dimples are arranged randomly. The calculated fractal dimension has qualitatively similar tendency toward the exponent of the distribution function but quantitatively different values. The difference might suggest the necessity of some structure to arrange the dimples.
Joining of YBCO Bulk Materials made by powder-sintering

Suzumura Akio, Tsunekawa Hajime, Ikeshoji ToshiTaka, Yamazaki Takahisa, Fujiwara Hideki

Pre-Prints of the National Meeting of JWS　(73)　410-411　2003/09/08
Publisher: Japan Welding Society
Fractal dimension of ductile-fractured surface of copper-brazed steel calculated from its dimple size distribution

TT Ikeshoji, A Suzumura

JSME INTERNATIONAL JOURNAL SERIES A-SOLID MECHANICS AND MATERIAL ENGINEERING　46　(3)　490-495　2003/07

DOI： 10.1299/jsmea.46.490 　

ISSN： 1344-7912
Braze pressure welding (BPW) - A new method for high quality pressure welding

A Suzumura, Y Inagaki, TT Ikeshoji, Y Ueno

JSME INTERNATIONAL JOURNAL SERIES A-SOLID MECHANICS AND MATERIAL ENGINEERING　46　(3)　208-212　2003/07

DOI： 10.1299/jsmea.46.208 　

ISSN： 1344-7912
Study on quantitative analysis of hydrogen permeation through the welded joint of stainless steel

SUZUMURA Akio, YAMASAKI Takahisa, IKESHOJI Toshitaka, KOGA Yusuke, YAMADA Ikuhisa

Materials and processing conference　343-344　2003
Publisher: The Japan Society of Mechanical Engineers

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It is necessary to reduce the hydrogen permeation through the welded joint in order to improve reliability of vacuum apparatus. For the base metal and the weld test specimens of stainless steel SUS304 of various thicknesses, hydrogen permeation quantification tests were carried out. As the result, it was revealed that the permeation quantity at the weld zone was about 4&acd;6 times of that of the base material. The relationship between the hydrogen permeation quantity and plate thickness was analyzed on the basis of diffusion theory, which showed that the hydrogen permeation flux was inversely proportional to the plate thickness, and this almost agreed with the experimental results.
ロケットエンジンノズルスカートのろう付施工について

池庄司敏孝

第6回航空宇宙材料フォーラム　2003
The formation and the effects of fillets in the braze-pressure-welded steel-pipe joints

SUZUMURA Akio, IKESHOJI Toshi-Taka, INAGAKI Yohei, UENO Yasuhiro

Pre-Prints of the National Meeting of JWS　(71)　310-311　2002/09/03
Publisher: Japan Welding Society
Heat Transfer and Plastic Deformation Analysis in Friction-welded Joints

SUZUMURA Akio, IKESHOJI Toshi-Taka, FUJISAWA Michinobu, NAKATA Ryusuke

Pre-Prints of the National Meeting of JWS　(71)　412-413　2002/09/03
Publisher: Japan Welding Society
414 Braze Pressure Welding (B. P. W.)-A New Method for High Quality Pressure Welding

SUZUMURA Akio, IKESHOJI ToshiTaka, INAGAKI Yohei, UENO Yasuhiro

JSME Materials and Processing Conference (M&P)　10　(2)　23-28　2002
Publisher: The Japan Society of Mechanical Engineers

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Braze Pressure Welding (B. P. W.) with high frequency induction heating has been invented as the new joining method for bonding general steel pipes for piping. The piping with B. P. W. has many merits as follows : small deformation at joint, less influence by heating around the joint, the fillets formed on the steps at the edge of joint. Especially the fillet relaxes the stress concentration, and makes the tensile strength of piping comparable to that of base metal. B. P. W. requires less skill for joining, so tensile strength of piping has less variation by welders. It has high work efficiency, and high portability without large equipments. The less potential danger of fire enables on-site B. P. W.' application even for indoor piping and repairing.
320 Fractal Dimension of Ductile Fractured Surface and The Dimple Size Distribution

IKESHOJI ToshiTaka, SUZUMURA Akio

JSME Materials and Processing Conference (M&P)　10　(1)　580-585　2002
Publisher: The Japan Society of Mechanical Engineers

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The origin of fractal characteristics of the ductile fractured surface is investigated. The dimples covering the ductile fractured surface are considered as the elements to form the fractal geometry. And the relationship of the dimple size distribution on the ductile fractured surface and its fractal dimension is investigated. Under the assumption that the distribution density function of dimple size on the ductile surface is subjected to the power law of the dimple size, and that a dimple has the cosine curve shape, the formulation of fractal dimension described with the term of the exponent of the power law distribution density function. Experimentally the relationship is confirmed for the fractured surface of cupper brazed steel joint, which has the feature ductile fractured surface without too large deformation. The result of this researc h could contribute to make clear the generating process of dimple covered ductile surface.
拡散接合部およびろう付部破面のフラクタル次元

池庄司敏孝, 鈴村暁男

溶接学会講演概要　71　2002
溶融ろうのマランゴニ対流

池庄司敏孝, 鈴村暁男, 雀部謙

溶接学会先端材料委員会　2002
201 Study on the prevention of the gas permeation through the welded joint of ultra high vacuum apparatus

SUZUMURA Akio, IKESHOJI Toshitaka, YAMADA Ikuhisa, YAMASAKI Takahisa

Materials and processing conference　2001　(9)　49-50　2001/11/02
Publisher: The Japan Society of Mechanical Engineers

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One of the factors to make an ultra high vacuum apparatus is to reduce the gas permeation through the welded joint. In order to clarify the contribution of surface conditions and the diffusion in specimen, the hydrogen gas permeation through the stainless steel with variation in thickness is investigated. As a result, the significant difference is observed in the tendency of the gas permeation rate in transient process and the value of the permeation rate at the steady state. The results suggest the surface condition have the large effect to the gas permeation rate. The analysis of these results might lead to the clarification of the effect of the diffusion through the bulk material and the surface conditions to the gas permeation phenomena through the welded joint of the stainless steel.
211 Plastic deformation behavior of friction-welded aluminium alloy joints

SUZUMURA Akio, IKESHOJI Toshitaka, NAKATA Ryusuke, FUJISAWA Michinobu

Materials and processing conference　2001　(9)　69-70　2001/11/02
Publisher: The Japan Society of Mechanical Engineers

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For development of the friction welding with smaller change in shapes, the prediction of plastic flow behavior during the friction welding process is required. Plastic flow behavior of aluminium alloy with the temperature distribution was numerically analyzed dynamically. The plastic flow behavior was calculated with the finite element method for the elasto-plastic material. The change of temperature distribution was analyzed with unsteady state heat conduction equation. The analysis was conducted with various welding parameters, including the friction pressure, friction time and the speed of rotation. The results of the numerical analysis were compared with the experimental results obtained by the friction welding with the same parameters.
119 The Fractality of the Ductile Fractere Surface

IKESHOJI Toshi-Taka, SUZUMURA Akio

Materials and processing conference　2001　(9)　39-40　2001/11/02
Publisher: The Japan Society of Mechanical Engineers

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The reason that the ductile fracture surface bears the fractal characteristics is investigated. The dimple shape covering the ductile surface is assumed to the sinusoidal curve and the dimple size distribution density function is considered to be able to describe by the power of the dimple size. The connection of the exponent of the power law, α, and the fractal dimension of the surface profile, D , is described in the form of D = α/2. The validity of this formula is evaluated with the comparison of the experimentally obtained fractal dimension.
127 Joining of YBCO bulk superconductor using superconductive interlayer

SUZUMURA Akio, IKESHOJI Toshitaka, FUJIWARA Hideki, HASHIMOTO Yu

Materials and processing conference　2001　(9)　271-272　2001/11/02
Publisher: The Japan Society of Mechanical Engineers

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YBa_2Cu_3O_<7-x> bulk superconductors (YBCO) are joined with insertion of the YBa_2Cu_3O_<7-x> superconductor (YbBCO) added with Ag_2O as the interlayer, which has lower peritectic temperature than the YBCO. The amount of Ag_2O addition is varied from none to 44 mass%. At high temperature under loading, the good joint is obtained. The shear strength of joints increases with addition of Ag_2O. The higher joining temperature, the stronger joint is obtained. The critical current density through the joint is maximum at the rage of 10〜30 mass% of Ag_2O addition. On the other side, the bulk material of the mixture of YBCO and YbBCO has the intermediate value of the critical temperature between the value of YBCO and YbBCO. It might suggest that the addition of the YBCO to this interlayer have the better characteristics as the superconductor.
224 The behavior and the effects of brazing filler in the braze-pressure-welded steel-pipe joints

SUZUMURA Akio, IKESHOJI Toshitaka, INAGAKI Yohei, MOCHIDA Takeshi, UENO Yasuhiro

Materials and processing conference　2001　(9)　303-304　2001/11/02
Publisher: The Japan Society of Mechanical Engineers

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At the joint of the ordinary piping of the carbon steel using the conventional welding methods or the mechanical joining, the formation of step is hard to avoid, which causes the stress concentration. We proposed the new welding method of the braze-pressure-welding (B.P.W) by the electromagnetic induction heating. The process uses the brazing filler material inserted at the joint interface, which is expected to fill the step to form fillet. It is considered to relief the stress concentration. In this research, the validity of the fillet is evaluated by the stress analysis using the finite element method. The carbon steel pipes are welded by this B.P.W. method in the air. The method to avoid the hard oxidation of the pipe is also proposed. At the joint, the oxidation is slightly occurred and the fillet is formed. The EDS analysis of the distribution of the atomic contents shows the brazing filler is ejected out of the joint interface. The tensile test yields the joint has the comparable strength with the bulk material.
Heat Transfer and Platic Flow Analysis in Friction-welded Joints

SUZUMURA Akio, IKESHOJI Toshitaka, MNAKATA Ryusuke

Pre-Prints of the National Meeting of JWS　(69)　160-161　2001/09/10
Publisher: Japan Welding Society
Gas permeation on TIG welded stainless steels

Suzumura Akio, Ikeshoji Toshitaka, Yamada Ikuhisa, Yamazaki Takahisa

Pre-Prints of the National Meeting of JWS　(69)　414-415　2001/09/10
Publisher: Japan Welding Society
A Fractal Surface Model of Ductile Fractured Surface of Brased Steel Joint

IKESHOJI Toshitaka, SUZUMURA Akio

Pre-Prints of the National Meeting of JWS　(69)　454-455　2001/09/10
Publisher: Japan Welding Society
Scale Dependence of Fractal Dimension for Tensile Fractured Surface of Diffusion Bonded Stainless Steel Joint

Toshi-Taka IKESHOJI, Akio Suzumura

LOT'01: 6th International Conference on Brazing, High Temperature Brazing and Diffusion Bonding. Aachen May 8-10, 2001　2001
Change in Fractal Dimension with Observing Scale for Tensile Fractured Surface of Copper-Brazing Steel Joint

Toshi-Taka IKESHOJI Akio, SUZUMURA

LOT'01: 6th International Conference on Brazing, High Temperature Brazing and Diffusion Bonding. Aachen May 8-10, 2001　2001
Scale Dependence of Fractal Dimension for Tensile Fractured Surface of Diffusion Bonded Stainless Steel Joint

Toshi-Taka IKESHOJI, Akio Suzumura

LOT'01: 6th International Conference on Brazing, High Temperature Brazing and Diffusion Bonding. Aachen May 8-10, 2001　2001
Change in Fractal Dimension with Observing Scale for Tensile Fractured Surface of Copper-Brazing Steel Joint

Toshi-Taka IKESHOJI Akio, SUZUMURA

LOT'01: 6th International Conference on Brazing, High Temperature Brazing and Diffusion Bonding. Aachen May 8-10, 2001　2001
427 Effect of surface conditions on the hydrogen permeation through the welded stainless steels

SUZUMURA Akio, KESHOJI Toshitaka, YAMADA Ikuhisa, SASAKI Yasuhiro, YAMASAKI Takahisa

Materials and processing conference　2000　(8)　323-324　2000/11/24
Publisher: The Japan Society of Mechanical Engineers

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In order to clarify the effect of surface conditions such as the oxide layer on the hydrogen permeation through the welded area of stainless steel, the permeability of stainless steels including welded area with the oxide layer which was made by heating in air was investigated. Permeation tests were conducted in such conditions as stainless steels with oxide layer only on high-pressure side where hydrogen gas was filled, or only on low-pressure side, or on the both sides. Permeability coefficient of welded stainless steels with oxide layer was different from stainless steels without oxide layer. Especially the permeability of the specimen with oxide layer on high-pressure side increased. This suggested that the permeation was considerably accelerated by adsorption of hydrogen gas on the oxide layer of the specimen.
426 Joining of YBCO bulk superconductor using YbBCO-Ag interlayer

SUZUMURA Akio, IKESHOJI Toshitaka, FUJIWARA Hideki, HASHIMOTO Yu

Materials and processing conference　2000　(8)　321-322　2000/11/24
Publisher: The Japan Society of Mechanical Engineers

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In order to develop joining methods maintaining mechanical strength and superconducting property, YBCO bulk superconductors were joined using YbBCO, which had lower peritectic temperature than YBCO, added Ag_2O as interlayer. As results of joining tests under such conditions that Ag_2O content added to YbBCO was 0〜44mass% and that joining temperature was 940℃〜1020℃, the joint strength increased in accordance with the joining temperature increase. Critical current density showed maximum value in case using the YbBCO interlayer added 10〜30mass%. Because of the boids made at the joint, strength of joint was inferior to that of matrix, however, it was suggested that joint properties could be improved by selecting the joining time and pressure properly.
418 Plastic flow behavior in Al-Ceramic friction-welded joints

SUZUMURA Akio, NAKATA Ryusuke, IKESHOJI Toshitaka

Materials and processing conference　2000　(8)　305-306　2000/11/24
Publisher: The Japan Society of Mechanical Engineers

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On Plastic flow behavior of Al at the Al-Ceramic friction-welded joints, the coupled deformation and heat flow analysis by finite element method was conducted. In the temperature field, it was demonstrated that the temperature increased at first on the friction surface, where the temperature in outside became higher than that in center. With the frictional time increasing, temperature increased whole site in Al. The deformation of Al became larger near the friction surface, and on the different welding conditions, the size of deformation was changed. In the plastic flow field, the flow direction was changed from the vertical direction to the friction surface to the parallel direction near the friction surface.
Joining of YBCO bulk superconductor using YbBCO interlayer added Ag

Suzumura Akio, Ikeshoji Toshitaka, Fujiwara Hideki, Hashimoto Yu

Pre-Prints of the National Meeting of JWS　(67)　522-523　2000/09/05
Publisher: Japan Welding Society
Effect of bonding conditions on the fractal dimension of tensile-fractured surface at diffusion-bonded joints

IKESHOJI Toshitaka, SUZUMURA Akio, OKADA Takahisa

Pre-Prints of the National Meeting of JWS　(67)　308-309　2000/09/05
Publisher: Japan Welding Society
Induction-Heated Pressure-Welding of Steel Pipe using Brazing Filler

SUZUMURA Akio, IKESHOJI Toshitaka, MOCHIDA Takeshi, UENO Yasuhiro

Pre-Prints of the National Meeting of JWS　(67)　316-317　2000/09/05
Publisher: Japan Welding Society
Hydrogen permeation property through welded stainless steels

Suzumura Akio, Ikeshoji Toshitaka, Yamada Ikuhisa, Sasaki Yasuhiro, Yamazaki Takahisa

Pre-Prints of the National Meeting of JWS　(67)　202-203　2000/09/05
Publisher: Japan Welding Society
Plastic Flow Analysis in Celamic-Metal Friction-welded Joints

SUZUMURA Akio, IKESHOJI Toshitaka, NAKATA Ryusuke

Pre-Prints of the National Meeting of JWS　(67)　54-55　2000/09/05
Publisher: Japan Welding Society
428 The relationship between bonding conditions and strength of pressure-welded steel-pipe joints using brazing filler

SUZUMURA Akio, IKESHOJI Toshitaka, MOCHIDA Takeshi, UENO Yasuhiro

Materials and processing conference　325-326　2000
Publisher: The Japan Society of Mechanical Engineers

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The carbon steel pipes for ordinary piping whose joints apt to have steps and stress concentration because of low accuracy for diameters and thickness, were pressure-welded using brazing filler by high frequency heating. Effect of the fillet produced at the step which is made by brazing filler extruded from the interface of joints on the joint strength, was examined by tensile tests and numerical analysis. According to tensile test, the strength of joints increased as fillet enlarged. It was confirmed by SEM/EDS analysis that brazing filler was extruded from the interface of joints, and different size of fillet was produced in accordance with the thickness of brazing filler. It was revealed that brazing filler filled the step and that the fillet relaxed the stress concentration to increase the strength of steel-pipe joints made by pressure welding using brazing filler at the joint interface.
Fractal Dimension of Steel Fracture Surface Ruptured under Brittle-Ductile Transition

Toshitaka IKESHOJI, Tadashi, SHIOYA Akio Suzumura

AEPA2000 -- the 5th Asia Pacific Symposium on the Advances in Engineering Plasticity and its Applications -- June, 2000, Hong Kong　2000
鋼の銅ろう付部引張破面のフラクタル解析

池庄司敏孝, 鈴村暁男, 山田幾久

溶接学会講演概要　67　226-227　2000
鋼の銅ろう付継手部破面のディンプル径分布とフラクタル次元

池庄司敏孝鈴村暁男山田幾久

第8回機械材料・材料加工技術講演会講演論文集　00-36　327-328　2000
拡散接合部の引張破面形状とフラクタル次元の関係

池庄司敏孝岡田隆寿鈴村暁男

第8回機械材料・材料加工技術講演会講演論文集　00-36　329-330　2000
Fractal Dimension of Steel Fracture Surface Ruptured under Brittle-Ductile Transition

Toshitaka IKESHOJI, Tadashi, SHIOYA Akio Suzumura

AEPA2000 -- the 5th Asia Pacific Symposium on the Advances in Engineering Plasticity and its Applications -- June, 2000, Hong Kong　2000
Fractal Dimension and Dimple Size Distribution on Fracture Suraface of Cu-Brazed Steel Joint

00-36　327-328　2000
The relationship between the structure of tensile-fractured surface at diffusion-bonded joint and its fractal dimension

00-36　329-330　2000
材料破面のフラクタル次元のスケール依存性

池庄司敏孝

日本機械学会誌　102　(971)　645-645　1999/10/05
Publisher: 一般社団法人日本機械学会
ISSN： 0021-4728
Scale Dependence of Fractal Dimension of Diffusion-Bonded Fracture Surface

Ikeshoji Toshitaka, Okada Takahisa, Suzumura Akio

Pre-Prints of the National Meeting of JWS　(65)　96-97　1999/09/21
Publisher: Japan Welding Society
Joint strength of Friction Welded Al-Based SiO_2-Fiber Reinforced Material and Behavior of Fiber Near Joint Boundary

Suzumura Akio, Ikeshoji Toshitaka, Saitoh Masaki

Pre-Prints of the National Meeting of JWS　(65)　542-543　1999/09/21
Publisher: Japan Welding Society
Brittle-ductile transition and scale dependence: Fractal dimension of fracture surface of materials

T Ikeshoji, T Shioya

FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY　7　(2)　159-168　1999/06

ISSN： 0218-348X
A Study on Relationship between Ductile-Brittle Transition and Change in Fractal Dimension of Fracture Surface

IKESHOJI Toshitaka, SHIOYA Tadashi

Transactions of the Japan Society of Mechanical Engineers Series B　64　(623)　1984-1990　1998
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.64.1984 　

ISSN： 0387-5008 1884-8338

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Ductile-brittle transition of the material fracture is studied in terms of the fractal dimension measured on the fractured surface. The tensile fracture tests are conducted for notched round bar specimens made of carbon steels. The notch radius and the carbon content of materials are changed to produce the ductile-brittle transition in the fracture. The fractal dimension is correlated with the absorbed energy. Two distinct regions appear in the plots of fractal dimension vs. absorbed energy : the fractal dimension for brittle fracture surface varies with observing scale, while that for ductile fracture remains almost constant. The variation in fractal dimension for brittle fracture surfaces can be interpreted by the size effect of brittle fracture.

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Books and Other Publications 7

図解金属3D積層造形のきそ

京極秀樹, 池庄司敏孝

日刊工業新聞社　2017/10

ISBN: 9784526077555
Advances in Brazing

IKESHOJI TOSHI-TAKA

Woodhead Publishing　2013

ISBN: 9780857094230
Fractography－Analysis and Case Studies

IKESHOJI TOSHI-TAKA

2010/03

ISBN: 9784924728615
Erosion of Ni Substrate by Marangoni Convection of Molten Ag-Cu-Pd Brazing Filler Metal

Brazing, High Temperature Brazing and Diffusion Welding, DVS-Berichte Band 231　2004
Erosion of Ni Substrate by Marangoni Convection of Molten Ag-Cu-Pd Brazing Filler Metal

Brazing, High Temperature Brazing and Diffusion Welding, DVS-Berichte Band 231　2004
Fractal Characteristics of Low Temperature Fractured Surface of Diffusion Bonded Joint of Stainless Steel

Proceedings of the 7th Inernational Symposium, JWS, 2001, Kobe　2001
Fractal Characteristics of Low Temperature Fractured Surface of Diffusion Bonded Joint of Stainless Steel

Proceedings of the 7th Inernational Symposium, JWS, 2001, Kobe　2001

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Presentations 64

Heat Conduction Behavior of Built Metal and Powder Bed during Pure Copper Laser Beam Powder Bed Fusion Process

IKESHOJI TOSHI-TAKA

2019/12/03
マルチスポットレーザによるパウダーベッド型積層造形

池庄司敏孝

高エネルギービーム加工研究委員会　2019/06/14
A-TIGによるSUS３１６L溶接部の組織と水素透過後の影響

平成22年度春季全国大会　2010
C/C複合材料と純チタンろう付に及ぼす席双方向の影響

溶接学会全国大会平成22年度春季大会　2010
ロケットスカートノズルアッシィ用四管束試験片ろう付継手部の強度と接合部間隙の関係

溶接学会全国大会平成22年度春季大会　2010
フラックス中の塩化亜鉛濃度とSUS304ステンレス鋼表面のAl-Siろう材のぬれ性

溶接学会全国大会講演概要86集（平成22年度春季大会）　2010
ナノクラスターダイヤモンド分散ta-C膜のラマン分光分析による評価

トライボロジー会議東京2010-5　2010
Joining of surface modified diamond to Fe-42Ni alloy using Zn-5Al solder

9th International Conference LOT 2010　2010
Brzing of C/C composites and titanium alloys with inserting OFHC copper foil

Brazing, Hight Temperature Brazing and Diffusion Bonding LOT2010　2010
Influence of ply direction to brazed joint of C/C composites and pure titanium

2010
The Influence of Gap Clearance to Joint Strength of Four-Pipe Brazed Specimen for Rocket Nozzle Skirt Assy

2010
Influence of Concentration of ZnCl2 in Flux to Wettability of Al-Si Brazing Filler on SUS304 Stainless Steel

2010
Joining of surface modified diamond to Fe-42Ni alloy using Zn-5Al solder

9th International Conference LOT 2010　2010
Brzing of C/C composites and titanium alloys with inserting OFHC copper foil

Brazing, Hight Temperature Brazing and Diffusion Bonding LOT2010　2010
Role of valence electron of vanadium carbide in metallization of diamond surface

International Brazing and Soldering Conference　2009
Brazing of Copper-coated Carbon/Carbon Composites to Titanium Alloys

International Brazing and Soldering Conference　2009
C/C複合材料とTi合金のろう付け強度とろう材の浸透現象

平成21年度秋季全国大会　2009
Role of valence electron of vanadium carbide in metallization of diamond surface

International Brazing and Soldering Conference　2009
Brazing of Copper-coated Carbon/Carbon Composites to Titanium Alloys

International Brazing and Soldering Conference　2009
Brazing joint strength of C/C composites and Ti alloys and infiltration of active brazing filler metal

National Meeting of J.W.S, Automn, 2009　2009
SUS304ステンレス鋼溶接部における水素透過経路の探査

平成20年度秋季全国大会　2008
Adherent Sn/57Bi solder alloy-melt on Cu cone plate at various shear velocities

8th International Welding Symposium　2008
Robustness of Micro-Mechanical Joining for Micro Copper Wire

8th International Symposium　2008
CuメタライズしたC/C複合材とTiのろう付

第８３回軽構造接合加工研究委員会　2008
Survey on hydrogen permeation paths in stainless steel SUS304 welded by TIG

Preprints of the national meeting of J.W.S.　2008
Adherent Sn/57Bi solder alloy-melt on Cu cone plate at various shear velocities

8th International Welding Symposium　2008
Robustness of Micro-Mechanical Joining for Micro Copper Wire

8th International Symposium　2008
金属基複合材料の活性液相拡散(A-TLP)接合

日本機械学会2007年度年次大会　2007
ステンレス鋼とアルミニウム合金の異材間大気中ろう付け

日本機械学会2007年度年次大会　2007
ステンレス鋼ろう付け圧接部の組織と強度および耐食性

日本機械学会第15回機械材料・材料加工技術講演会　2007
Sn-Bi はんだの動粘性測定と界面エネルギの検討

日本機械学会第15回機械材料・材料加工技術講演会　2007
Active-Transient Liquid Phase (A-TLP) bonding process for metal matrix composite

2007
Brazing between dissimilar metals/alloys of stainless steel and aluminum alloys in the air

2007
Microstructure, Strength and Corrosion Resistance of Brazu Pressure Welded Joint of Stainless Steel Pipe

The 15th Materials and Processing Conference (M&P2007)　2007
Investigation of Interfacial Energy of Sn-Bi Solder-melt with respect to Viscosity

The 15th Materials and Processing Conference (M&P2007)　2007
銅細線の端子固定用マイクロメカニカル接合法の研究

第14回機械材料・材料加工技術講演会　2006
高周波誘導加熱を用いたステンレス鋼管のろう付圧接に最適なろう材の開発

第14回機械材料・材料加工技術講演会　2006
Research on micro mechanical joining for fixing of fine copper line on electrical terminal

2006
Development of interlayer metal suitable for Braze Pressure welding using induction heating for joining of stainless steel pipes

2006
An erosion by Marangoni convection of molten brazing filler metal

AWS 35th International Brazing and Soldering Symposium　2005
A Method to Predict Temperature Fields During Frictional Welding By Introducing The Heat Input Coefficient and The Heat Input Surface Transfer

World Tribology Congress 2005　2005
An erosion by Marangoni convection of molten brazing filler metal

AWS 35th International Brazing and Soldering Symposium　2005
A Method to Predict Temperature Fields During Frictional Welding By Introducing The Heat Input Coefficient and The Heat Input Surface Transfer

World Tribology Congress 2005　2005
ロケットノズルスカート用管束ろう付試験片の強度とろう付部間隙

2004
ディンプル系分布をもとにした界面接合部模擬延性破面のフラクタル次元

2003
溶融ろうのマランゴニ対流による母材侵食

2003
配管用鋼管の高周波ろう付圧接におけるフィレット形成効果の解析

2003
ステンレス鋼溶接部における水素透過現象の定量化に関する研究

2003
配管用鋼管の高周波ろう付圧接のインサートメタルによる特性と効果

2003
YBCO粉末焼結バルクの接合

2003
Fractal Dimension of Ductile Fractured Surface and The Dimple Size Distribution

2002
Braze Pressure Welding (B.P.W.) - A New Method for Hight Quality Pressure Welding -

2002
Fractal Dimension of Ductile Fractured Surface and The Dimple Size Distribution

2002
Braze Pressure Welding (B.P.W.) - A New Method for Hight Quality Pressure Welding -

2002
Analysis of Deformation and Heat Flow During Friction Welding of Aluminium To Ceramics

2001
延性破面のフラクタル性に関する研究

2001
ろう付破面を用いた延性破面のフラクタルモデルの検証

2001
Analysis of Deformation and Heat Flow During Friction Welding of Aluminium To Ceramics

2001
The Fractality of Ductile Fracture Surface

2001
A Surface Fractal Model of Ductile Fractured Surface of Brased Steel Joint

2001
Fractal Dimension of Fracture Surfaces in Ductile-Brittle Transition Regime

1997
Fractal Dimension of Fracture Surfaces in Ductile-Brittle Transition Regime

1997
Change in fractal regime on worn surface

1995
Change in fractal regime on worn surface

1995

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Research Projects 13

High quality dissimilar joining using stress relaxation insert layer of porous structure with low thermal expansion fabricated by metal additive manufacturing

Ikeshoji Toshi-Taka

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Kindai University

2017/04/01 - 2020/03/31

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A dissimilar material joint between a Ni-based alloy and a C/C composites was obtained using a Ni-based brazing filler alloy by inserting a porous interlayer fabricated by the laser powder bed fusion (PBF-LB), which was expected to relief the residual stress. In the course of the research, a numerical calculation method was developed to simulate the PBF-LB process considering the melt solidification phenomenon in order to confirm the modeling accuracy possible with PBF-LB, and the minimum thickness was estimated to be about twice the laser spot diameter. The CTE value of Ni-based brazing material was measured in the range of 100-1100 °C to obtain basic data for brazing joint strength prediction. It was also clarified that the change in the powder bed temperature during the PBF-LB process was large enough to require modification of the molding conditions.
High quality joining of C/C composites and high temperature refractory metal with inter-metal layer

IKESHOJI Toshi-Taka

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

2012/04/01 - 2016/03/31

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For C/C composites/Ni-based refractory metal high quality joining, Ni-based alloy was made. 58Ni-20Cr-22Si alloy and 57Ni-20Cr-22Si alloy had good wettability on both C/C composites and Inconel-600 Ni-base alloy. These Ni-base alloy had the liquidus temperature lower than 1200ºC and can be used for high temperature brazing. The shear strength of C/C composites/Inconel-600 brazed joint with these metals was 2MPa. Crack was observed in C/C composites near joint interface. Enhancement of joint strength is considered to be due to the residual stress by CTE value difference between C/C composites and Inconel-600. By inserting Nb foil in the mating surfaces, the joint strength was improved. The interfacial bonding is, however, sound between both C/C composites and these alloys and Inconel-600 and these alloys, and with these alloys, high quality bonding is considered to be able to achieve.
C/C複合材料とTi合金の電子ビームろう付 Competitive

2006 - 2010
Electrong Beam Brazing of C/C Composites and Ti Alloys Competitive

2006 - 2010
溶融ろうのマランゴニ対流 Competitive

2001 - 2002
Marangoni Convection in Weld Pool of Melted Brazing Filler Metal Competitive

2001 - 2002
Liquid Phase Diffusion Bonding of High Temperature Superconducting Ceramics

SUZUMURA Akio, IKESHOJI Toshitaka, OHTAKE Naoto

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: TOKYO INSTITUTE OF TECHNOLOGY

1999 - 2000

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In order to develop joining methods maintaining mechanical strength and superconducting property, YBCO(Y123) bulk superconductors were joined using YbBCO(Yb123), which had lower peritectic temperature than YBCO, added Ag2O as interlayer. The concept of the joining method in this study is based on the fact that the peritectic formation temperature(TP) of Yb123 is about 50K lower than that of Y123. The Samples were heated at about 1293K(above TP of Y123) for 10 minutes and slowly cooled down to 1198K.The microstructures of the joints revealed that Y element diffused from the bulk to the joining layers and Yb diffused from the joining layers to the bulk, and the joining part seemed to become more dense. As results of joining tests under such conditions that Ag2O content added to YbBCO was 0〜44 mass % and that joining temperature was 1213K 〜1293K, the joint strength increased in accordance with the joining temperature increase. Critical current density showed maximum value in case using the YbBCO interlayer added 10〜30 mass %Ag2O.Because of the boids occurred at the joint area, strength of the joint was inferior to that of the matrix, however, it was suggested that joint properties could be improved by selecting the joining time and pressure conditions. The possibility to improve the joining property of Y123 bulk was shown by use of Yb123 interlayer.
ろう付部破面のフラクタル解析 Competitive
短繊維強化金属複合材料とセラミクスの摩擦圧接部における短繊維挙動の解析 Competitive
拡散接合部破面のフラクタル解析 Competitive
Fractal analysis of fracture surfaces of blazed material Competitive
Analysis of fiber behavior during fiction bonding of fiber reinforced metal and ceramics Competitive
Fractal analysis of fracture surfaces of diffusion bonded material Competitive

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Teaching Experience 18

Finite Element Method　Meiji University, Faculty of Engineering
Engineering Mechanics　Kindai University Faculty of Engineering
Finite Element Method　Kindai University Faculty of Engineering
System Engineering　Kindai University Faculty of Engineering
Programming 1　Kindai University Faculty of Engineering
Programming 2　Kindai University Faculty of Engineering
Engineering of Design and Production 2　Tokyo Institute of Technology Faculty of Engineering
Machano Intelligence System Creation　Tokyo Institute of Technology Faculty of Engineering
Project research　Tokyo Institute of Technology Faculty of Engineering
プロジェクト研究　東京工業大学工学部
機械知能システム創造　東京工業大学工学部
設計と生産の工学第二　東京工業大学工学部
プログラミング２　近畿大学工学部
プログラミング１　近畿大学工学部
システム工学　近畿大学工学部
有限要素法　明治大学工学部, 近畿大学工学部
機械工学基礎実験　近畿大学工学部
工業力学　近畿大学工学部

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