Multimodal analysis of aluminum-steel dissimilar joint interface: Strength improvement mechanism through Ni addition Peer-reviewed

Kiyoaki T. Suzuki, Shun Tokita, Sylvain Dancette, Yutaka S. Sato

Materials & Design　255　114236　2025/07

DOI： 10.1016/j.matdes.2025.114236 　

ISSN： 0264-1275

Compositional gradient induced by heterogeneous domain synergy strategy toward high-performance diffusion bonding

Yinchen Wang, Zhijie Ding, Peng Li, Zhiwei Qin, Xiaoyang Bi, Liangliang Zhang, Chao Li, Honggang Dong, Huawei Sun, Yafang Cheng, Yutaka S. Sato

Composites Part B: Engineering　297　112330-112330　2025/05

DOI： 10.1016/j.compositesb.2025.112330 　

ISSN： 1359-8368

In situ tailoring microstructure of martensitic stainless steel during wire-arc directed energy deposition via intrinsic heat treatment

Zhiwei Lyu, Su Li, Yutaka S. Sato, Yue Zhao, Xi He, Zhifang Shi, Yifeng Xiao, Qiang Zhu

Journal of Manufacturing Processes　141　282-295　2025/05

DOI： 10.1016/j.jmapro.2025.03.005 　

ISSN： 1526-6125

Hybrid Inverse Modeling Technique to Determine the Fracture Properties of Intermetallic Layer Formed at Al/Steel Dissimilar Weld Interface

Kiyoaki T. Suzuki, Yutaka S. Sato, Shun Tokita, Joël Lachambre, Sylvain Dancette

Mechanisms and Machine Science　895-904　2025/03/18

DOI： 10.1007/978-3-031-82907-9_67 　

ISSN： 2211-0984

eISSN： 2211-0992

Structural reliability assessment under creep-fatigue considering multiple uncertainty sources based on surrogate modeling approach Peer-reviewed

Yuan-Ze Tang, Xian-Cheng Zhang, Hang-Hang Gu, Kai-Shang Li, Chang-Qi Hong, Shan-Tung Tu, Yutaka S. Sato, Run-Zi Wang

International Journal of Fatigue　192　108728-108728　2025/03

DOI： 10.1016/j.ijfatigue.2024.108728 　

ISSN： 0142-1123

Hybrid Inverse Modeling Technique to Determine the Fracture Properties of Intermetallic Layer Formed at Al/Steel Dissimilar Weld Interface

Kiyoaki T. Suzuki, Yutaka S. Sato, Shun Tokita, Joël Lachambre, Sylvain Dancette

Mechanisms and Machine Science　176　895-904　2025

DOI： 10.1007/978-3-031-82907-9_67 　

ISSN： 2211-0984

eISSN： 2211-0992

Interfacial characteristics and microstructural evolution of austenitic to ferritic stainless steels bimetallic structure fabricated by wire-arc directed energy deposition Peer-reviewed

Yipu Xu, Run-Zi Wang, Yutaka S. Sato, Shun Tokita, Yue Zhao, Zongli Yi, Aiping Wu

Additive Manufacturing　98　104629-104629　2025/01

DOI： 10.1016/j.addma.2024.104629 　

ISSN： 2214-8604

Microstructure and mechanical property of laser powder bed fusion additive manufactured Al-10Si-Mg alloy Peer-reviewed

Hyuga Hayashi, Shun Tokita, Yutaka S. Sato, Tomonori Kimura, Hirotsugu Kawanaka, Yusuke Yasuda, Seung Hwan, C. Park

64　(12)　581-586　2024/12

Creep-fatigue damage level evaluation based on the relationship between microstructural evolution and mechanical property degradation Peer-reviewed

Li Sun, Xian-Cheng Zhang, Kai-Shang Li, Ji Wang, Shun Tokita, Yutaka S. Sato, Shan-Tung Tu, Run-Zi Wang

International Journal of Plasticity　181　104086-104086　2024/10

DOI： 10.1016/j.ijplas.2024.104086 　

ISSN： 0749-6419

Strain-Mediated Defect Engineering toward Rapid Atomic Migration in Fe–Al Diffusion Couples Peer-reviewed

Zhijie Ding, Peng Li, Zhiwei Qin, Weiben Huang, Peng Zhao, Dianwu Zhou, Xiangchen Meng, Yutaka S. Sato, Honggang Dong

Nano Letters　2024/09/06

DOI： 10.1021/acs.nanolett.4c03115 　

ISSN： 1530-6984

eISSN： 1530-6992

Improved strength and interfacial microstructure of dissimilar Al/steel weld via combined addition of Zn and Ni Peer-reviewed

Kiyoaki T. Suzuki, Shun Omura, Shun Tokita, Yujiro Tatsumi, Sylvain Dancette, Yutaka S. Sato

Materials & Design　245　113302-113302　2024/09

DOI： 10.1016/j.matdes.2024.113302 　

ISSN： 0264-1275

Tailoring microstructure and mechanical properties of 17-4PH steel fabricated by wire-arc directed energy deposition via a combination of intrinsic and post-processing heat treatments Peer-reviewed

Zhiwei Lyu, Yutaka S. Sato, Su Li, Wanghui Xu, Zhen Xu, Xiaogang Hu, Qiang Zhu

Additive Manufacturing　80　103954　2024/01

DOI： 10.1016/j.addma.2023.103954 　

ISSN： 2214-8604

Simultaneous enhancements of strength and ductility of wire arc additive manufactured 17-4PH steel via intrinsic heat treatment Peer-reviewed

Zhiwei Lyu, Yutaka S. Sato, Wanghui Xu, Su Li, Zhen Xu, Xiaogang Hu, Xinggang Li, Qiang Zhu

Journal of Materials Processing Technology　321　118149-118149　2023/12

DOI： 10.1016/j.jmatprotec.2023.118149 　

ISSN： 0924-0136

Effects of material combination for ultrasonic spot welding on microstructure and strength of Al/Al, Al/Cu, and Al/Ni dissimilar joints Peer-reviewed

Shun TOKITA, Cheng Yi LIU, Yutaka S. SATO

Journal of Materials Research and Technology　2023/09

DOI： 10.1016/j.jmrt.2023.09.094 　

ISSN： 2238-7854

Formation mechanism of microstructure inhomogeneity in a martensitic stainless steel during wire arc additive manufacturing

Z. Lyu, Y.S. Sato, S. Tokita, Y. Zhao, J. Jia, A. Wu

IIW Document II-425-2023　1-7　2023/07

Microstructures and mechanical properties of AlCoCrFeNi2.1/6061-T6 aluminum-matrix composites prepared by friction stir processing Peer-reviewed

Peng Li, Yiqi Tong, Xingxing Wang, Yutaka S. Sato, Honggang Dong

Materials Science and Engineering: A　863　144544-144544　2023/01

DOI： 10.1016/j.msea.2022.144544 　

ISSN： 0921-5093

Drastic Improvement in Dissimilar Aluminum-to-Steel Joint Strength by Combining Positive Roles of Silicon and Nickel Additions Peer-reviewed

Kiyoaki T. Suzuki, Shun Omura, Shun Tokita, Yutaka S. Sato, Yujiro Tatsumi

Materials & Design　225　111444-111444　2023/01

DOI： 10.1016/j.matdes.2022.111444 　

ISSN： 0264-1275

Microstructure and mechanical property of gas tungsten arc and friction stir welds of L₁₂ precipitate FCC high-entropy alloy Peer-reviewed

Poying Hsieh, Chihhsien Liao, Hungchih Liu, Poting Lin, Paikeng Shen, Shaowei Hunag, Yutaka S. Sato, Chewei Tsai

APL Materials　10　(11)　111111-111111　2022/11/01

DOI： 10.1063/5.0117251 　

eISSN： 2166-532X

Homogenization of microstructure and mechanical properties of wire arc additive manufactured martensitic stainless steel through optimization of post-process heat treatment Peer-reviewed

Zhiwei Lyu, Yutaka S. Sato, Shun Tokita, Yue Zhao, Jinlong Jia, Aiping Wu

Journal of Materials Research and Technology　21　2682-2692　2022/11

DOI： 10.1016/j.jmrt.2022.10.077 　

ISSN： 2238-7854

Twin Boundary Induced Grain Coarsening in Friction Stir Welding of Fine- and Ultra-Fine-Grained Commercially Pure Titanium Base Metals Peer-reviewed

Jae-Deuk Kim, Siva Prasad Murugan, Seong-Woo Choi, Yutaka S. Sato, Jae-Keun Hong, Changwook Ji, Chang-Sub Kwak, Yeong-Do Park

Metals　12　(8)　1361-1361　2022/08/16

DOI： 10.3390/met12081361 　

eISSN： 2075-4701

Parameter Optimization of Ultrasonic Welding of Al by Crystallographic Orientation Analysis Peer-reviewed

Takashi Ito, Takahiro Aizawa, Yasunari Ukita, Yutaka S. Sato

Journal of The Japan Institute of Electronics Packaging　25　(3)　232-239　2022/05/01

DOI： 10.5104/jiep.jiep-d-21-00090 　

ISSN： 1343-9677

eISSN： 1884-121X

Effect of Ni Addition on the Interfacial Strength of Al/Cu Dissimilar Welds Produced by Friction Stir Lap Welding Peer-reviewed

Kota Kurabayashi, Shun Tokita, Yutaka S. Sato

Metals　12　(3)　453-453　2022/03/07

DOI： 10.3390/met12030453 　

eISSN： 2075-4701

Effect of Underwater Operation and Surface Rust Layer on Friction Stir Weldability of Carbon Steel Peer-reviewed

Yutaka S. Sato, Tomoko Miyamori, Shun Tokita, Hiroyuki Kokawa

Tetsu-to-Hagane　108　(12)　902-910　2022

DOI： 10.2355/tetsutohagane.tetsu-2022-024 　

ISSN： 0021-1575

eISSN： 1883-2954

Microstructure and properties of multilayer WC-40Co coating on Ti-6Al-4V by electron beam cladding Peer-reviewed

Wenqin Wang, Shiqi Zhang, Sheng Xiao, Yutaka S. Sato, De Wang, Yong Liu, Donglei Liu, Qiang Hu

Materials Characterization　183　111585-111585　2022/01

DOI： 10.1016/j.matchar.2021.111585 　

ISSN： 1044-5803

Microstructural evolution in a thin wall of 2Cr13 martensitic stainless steel during wire arc additive manufacturing Peer-reviewed

Zhiwei Lyu, Yutaka S. Sato, Shun Tokita, Yue Zhao, Jinlong Jia, Aiping Wu

Materials Characterization　182　111520-111520　2021/12

DOI： 10.1016/j.matchar.2021.111520 　

ISSN： 1044-5803

Microstructural distribution and anisotropic tensile behavior in a 2Cr13 martensitic stainless steel thin wall fabricated by wire arc additive manufacturing Peer-reviewed

Zhiwei Lyu, Yutaka S. Sato, Shun Tokita, Yue Zhao, Jinlong Jia, Aiping Wu

Materials Today Communications　29　102870-102870　2021/10

DOI： 10.1016/j.mtcomm.2021.102870 　

ISSN： 2352-4928

Microstructure characterization and wear performance of WC-10Co/Ti-6Al-4V coating fabricated via electron beam cladding Peer-reviewed

Yawei Chen, De Wang, Wenqin Wang, Yong Liu, Yutaka S. Sato, Tomiko Yamaguchi, Yunxia Chen, Chenghai Wang

Surface and Coatings Technology　422　127493-127493　2021/09

DOI： 10.1016/j.surfcoat.2021.127493 　

ISSN： 0257-8972

The role of shot peening on liquation cracking in laser cladding of K447A nickel superalloy powders over its non-weldable cast structure

Zhenlin Zhang, Yue Zhao, Jiguo Shan, Aiping Wu, Yutaka S. Sato, Shun Tokita, Kota Kadoi, Hiroshige Inoue, Huaipeng Gu, Xin Tang

Materials Science and Engineering: A　823　141678-141678　2021/08

DOI： 10.1016/j.msea.2021.141678 　

ISSN： 0921-5093

Microstructural Control of the Interface Layer for Strength Enhancement of Dissimilar Al/Cu Joints via Ni Addition during TIG Arc Brazing Peer-reviewed

Hiroki S. Furuya, Sakiko Yabu, Yutaka S. Sato, Hiroyuki Kokawa

Metals　11　(3)　491-491　2021/03/16

DOI： 10.3390/met11030491 　

eISSN： 2075-4701

Hardness distribution and aging response associated with precipitation behavior in a laser pressure welded Al–Li alloy 2198 Peer-reviewed

Tianbo Zhao, Yutaka S. Sato, Rongshi Xiao, Ting Huang, Jingquan Zhang

Materials Science and Engineering: A　808　140946-140946　2021/03

DOI： 10.1016/j.msea.2021.140946 　

ISSN： 0921-5093

Effect of Tool Geometries on “Heat-Input” During Friction Stir Welding of Aluminum Alloys Invited Peer-reviewed

Yutaka S. Sato, Yuichiro Tanai, Dalong Yi, Tianbo Zhao, Hiroyuki Kokawa

Friction Stir Welding and Processing XI, The Minerals, Metals & Materials Series　171-177　2021

DOI： 10.1007/978-3-030-65265-4_16 　

ISSN： 2367-1181

eISSN： 2367-1696

Evolution behavior of liquid film in the heat-affected zone of laser cladding non-weldable nickel-based superalloy Peer-reviewed

Zhenlin Zhang, Yue Zhao, Jiguo Shan, Aiping Wu, Yutaka S. Sato, Shun Tokita, Kota Kadoi, Hiroshige Inoue, Huaipeng Gu, Xin Tang

Journal of Alloys and Compounds　863　158463-158463　2021/01

DOI： 10.1016/j.jallcom.2020.158463 　

ISSN： 0925-8388

Heterogeneous structure-induced strength-ductility synergy by partial recrystallization during friction stir welding of a high-entropy alloy Peer-reviewed

Po-Ting Lin, Hung-Chi Liu, Po-Ying Hsieh, Cheng-Yu Wei, Che-Wei Tsai, Yutaka S. Sato, Shih-Che Chen, Hung-Wei Yen, Nian-Hu Lu, Chih-Hsuan Chen

Materials & Design　197　109238-109238　2021/01

DOI： 10.1016/j.matdes.2020.109238 　

ISSN： 0264-1275

Rapid Joining of Commercial-Purity Ti to 304 Stainless Steel Using Joule Heating Diffusion Bonding: Interfacial Microstructure and Strength of the Dissimilar Joint Invited Peer-reviewed

K. T. Suzuki, Y. S. Sato, S. Tokita

Metals　10　(12)　1689-1689　2020/12/18

DOI： 10.3390/met10121689 　

eISSN： 2075-4701

Suppression of intergranular corrosion by surface grain boundary engineering of 304 austenitic stainless steel using laser peening plus annealing Peer-reviewed

Shun Tokita, Hiroyuki Kokawa, Shohei Kodama, Yutaka S. Sato, Yuji Sano, Zhuguo Li, Kai Feng, Yixiong Wu

Materials Today Communications　25　101572-101572　2020/12

DOI： 10.1016/j.mtcomm.2020.101572 　

ISSN： 2352-4928

Effects of rotational speed on the Al0.3CoCrCu0.3FeNi high-entropy alloy by friction stir welding Peer-reviewed

Po-Ting Lin, Chan-Sheng Wu, Chun-Hao Peng, Che-Wei Tsai, Yutaka S. Sato

High Temperature Materials and Processes　39　(1)　556-566　2020/11/24

DOI： 10.1515/htmp-2020-0046 　

ISSN： 0334-6455

eISSN： 2191-0324

The role of the pulsed-wave laser characteristics on restraining hot cracking in laser cladding non-weldable nickel-based superalloy Peer-reviewed

Zhenlin Zhang, Yue Zhao, Yang Chen, Zhen Su, Jiguo Shan, Aiping Wu, Yutaka S. Sato, Huaipeng Gu, Xin Tang

Materials & Design　198　109346-109346　2020/11

DOI： 10.1016/j.matdes.2020.109346 　

ISSN： 0264-1275

Microstructural Characterization of Friction-Stir Processed Ti-6Al-4V Peer-reviewed

Sergey Mironov, Yutaka S. Sato, Hiroyuki Kokawa, Satoshi Hirano, Adam L. Pilchak, Sheldon Lee Semiatin

Metals　10　(7)　976-976　2020/07/20

DOI： 10.3390/met10070976 　

eISSN： 2075-4701

Predicting Tensile Properties of Friction-Stir-Welded 6063 Aluminum with Experimentally Measured Welding Heat Input Peer-reviewed

Tianbo Zhao, Yutaka S. Sato, Hiroyuki Kokawa, Kazuhiro Ito

Acta Metallurgica Sinica (English Letters)　33　(9)　1235-1242　2020/07/09

DOI： 10.1007/s40195-020-01099-9 　

ISSN： 1006-7191

eISSN： 2194-1289

Joining condition dependency of joint resistance in ultrasonic welding of high-temperature superconducting tapes with indium Peer-reviewed

S Ito, R Hayasaka, K Yuki, Y S Sato, H Hashizume

Journal of Physics: Conference Series　1559　012065-012065　2020/06

DOI： 10.1088/1742-6596/1559/1/012065 　

ISSN： 1742-6588

eISSN： 1742-6596

Laser pressure welding of Al-Li alloy 2198: effect of welding parameters on fusion zone characteristics associated with mechanical properties Peer-reviewed

Tianbo Zhao, Yutaka S. Sato, Rongshi Xiao, Ting Huang, Jingquan Zhang

High Temperature Materials and Processes　39　(1)　146-156　2020/05/27

DOI： 10.1515/htmp-2020-0047 　

ISSN： 0334-6455

eISSN： 2191-0324

Grain Structure Evolution during Friction-Stir Welding Peer-reviewed

S. Mironov, Y.S. Sato, H. Kokawa

Physical Mesomechanics　23　(1)　21-31　2020/01

Effect of thermomechanical parameters on grain growth and recrystallization during grain boundary engineering of austenitic stainless steel

Shun Tokita, Hiroyuki Kokawa, Yutaka S. Sato

Journal of Physics: Conference Series　1270　012031-012031　2019/08

DOI： 10.1088/1742-6596/1270/1/012031 　

ISSN： 1742-6588

eISSN： 1742-6596

Comparison of Heat Assisted Lap Joints of High-Temperature Superconducting Tapes with Inserted Indium Foils Peer-reviewed

S. Ito, H.T. Fujii, R. Hayasaka, Y.S. Sato, H. Hashizume

IEEE Transactions of Applied Superconductivity　29　(5)　6600405　2019/08

DOI： 10.1109/TASC.2019.2892050 　

Novel analytical approach for evaluating the mechanical properties of friction stir spot joints through constitutive modeling Peer-reviewed

A. Barabi, A. Zarei-Hanzaki, M. Mosayebi, A. Mohamadizadeh, A.S. Anoushe, H.R. Abedi, A. Maghsoudlou, Y.S. Sato

Engineering Fracture Mechanics　216　106522-106522　2019/07

DOI： 10.1016/j.engfracmech.2019.106522 　

ISSN： 0013-7944

Crystallography of Martensite in Friction-Stir-Welded 12Cr Heat-Resistant Steel Peer-reviewed

Peng Hua, Sergey Mironov, Yutaka S. Sato, Hiroyuki Kokawa, Seung Hwang C. Park, Satoshi Hirano

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science　50A　(7)　3158-3163　2019/07

DOI： 10.1007/s11661-019-05220-1 　

ISSN： 1073-5623

Influence of Welding Temperature on Material Flow During Friction Stir Welding of AZ31 Magnesium Alloy Peer-reviewed

S. Mironov, Y.S. Sato, H. Kokawa

Metallurgical and Materials Transactions A　50A　2798-2806　2019/06

DOI： 10.1007/s11661-019-05194-0 　

Material Flow and Microstructure Evolution in Corner Friction Stir Welding of 5083 Al Alloy Using AdStir Technology Peer-reviewed

Kunitaka Masaki, Hiroshi Saito, Koji Nezaki, Shoko Kitamoto, Yutaka S. Sato, Hiroyuki Kokawa

Friction Stir Welding and Processing X, The Minerals, Metals & Materials Society　181-188　2019/03

DOI： 10.1007/978-3-030-05752-7_17 　

Improvement of Interfacial Strength with the Addition of Ni in Al/Cu Dissimilar Joints Produced via Laser Brazing Peer-reviewed

H.S. Furuya, Y.S. Sato, H. Kokawa, T. Huang, R.S. Xiao

Metallurgical and Materials Transactions A　49　(12)　6215-6223　2018/12

DOI： 10.1007/s11661-018-4938-z 　

Friction-stir processing

Sergey Mironov, Yutaka S. Sato, Hiroyuki Kokawa

Nanocrystalline Titanium　55-69　2018/09/20

DOI： 10.1016/B978-0-12-814599-9.00004-3 　

Feasibility of high-speed friction stir welding of pure copper using newly developed cobalt-based alloy tool Peer-reviewed

Y.S. Sato, K. Inagaki, H.T. Fujii, H. Kokawa

Journal of Japan Insitute of Copper　57　(1)　122-126　2018/08

ISSN： 1347-7234

Microstructural Evolution During the Thermomechanical Process for Grain Boundary Engineering of Austenitic Stainless Steel

Shun Tokita, Hiroyuki Kokawa, Yutaka S. Sato, Hiromichi T. Fujii

The 71st IIW Annual Assembly & International Conference　IX-2645-18　1-12　2018/07

Experimental measurement of welding heat-input and its responses to mechanical properties during friction stir welding of aluminum alloy 6063 Peer-reviewed

T. Zhao, Y.S. Sato, H. Kokawa, K. Ito

Proceedings of 12th International Symposium on Friction Stir Welding, Chicoutimi, Quebec, Canada　CD-ROM　2018/06

Interfacial microstructure evolution and weld formation during ultrasonic welding of Al alloy to Cu Peer-reviewed

H. T. Fujii, H. Endo, Y. S. Sato, H. Kokawa

Materials Characterization　139　233-240　2018/05/01

DOI： 10.1016/j.matchar.2018.03.010 　

ISSN： 1044-5803

Microstructure and tensile behavior of friction-stir welded TRIP steel Peer-reviewed

S. Mironov, Y. S. Sato, S. Yoneyama, H. Kokawa, H. T. Fujii, S. Hirano

Materials Science and Engineering A　717　26-33　2018/02/21

DOI： 10.1016/j.msea.2018.01.053 　

ISSN： 0921-5093

Strength Improvement Through Grain Refinement of Intermetallic Compound at Al/Fe Dissimilar Joint Interface by the Addition of Alloying Elements Peer-reviewed

H. S. Furuya, Y. T. Sato, Y. S. Sato, H. Kokawa, Y. Tatsumi

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science　49　(2)　527-536　2018/02/01

DOI： 10.1007/s11661-017-4442-x 　

ISSN： 1073-5623

High speed welding of friction-stir-welding for mild steel by gas-tungsten-arc-welding hybrid process

Itto Sugimoto, Seung Hwan C. Park, Satoshi Hirano, Satoshi Hata, Yutaka S. Sato, Hiroyuki Kokawa, Kiyohito Ishida

Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society　36　(1)　26-30　2018

DOI： 10.2207/qjjws.36.26 　

ISSN： 0288-4771

In situ EBSD observation of grain boundary character distribution evolution during thermomechanical process used for grain boundary engineering of 304 austenitic stainless steel Peer-reviewed

Shun Tokita, Hiroyuki Kokawa, Yutaka S. Sato, Hiromichi T. Fujii

MATERIALS CHARACTERIZATION　131　31-38　2017/09

DOI： 10.1016/j.matchar.2017.06.032 　

ISSN： 1044-5803

eISSN： 1873-4189

Microstructural changes during tension of friction-stir welded AZ31 magnesium alloy Peer-reviewed

S. Mironov, T. Onuma, Y. S. Sato, S. Yoneyama, H. Kokawa

MATERIALS CHARACTERIZATION　130　1-8　2017/08

DOI： 10.1016/j.matchar.2017.05.016 　

ISSN： 1044-5803

eISSN： 1873-4189

High-strain-rate deformation in ultrasonic additive manufacturing Peer-reviewed

Hiromichi T. Fujii, Saki Shimizu, Yutaka S. Sato, Hiroyuki Kokawa

SCRIPTA MATERIALIA　135　125-129　2017/07

DOI： 10.1016/j.scriptamat.2016.12.030 　

ISSN： 1359-6462

Evaluation of heat input during friction stir welding of aluminium alloys Peer-reviewed

D. Yi, T. Onuma, S. Mironov, Y. S. Sato, H. Kokawa

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING　22　(1)　41-46　2017

DOI： 10.1080/13621718.2016.1183079 　

ISSN： 1362-1718

eISSN： 1743-2936

Tensile behavior of friction-stir welded AZ31 magnesium alloy Peer-reviewed

S. Mironov, T. Onuma, Y. S. Sato, S. Yoneyama, H. Kokawa

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING　679　272-281　2017/01

DOI： 10.1016/j.msea.2016.10.036 　

ISSN： 0921-5093

eISSN： 1873-4936

Feasibility of Iridium Containing Nickel Based Superalloy Tool to Friction Stir Spot Welding of High Strength Steel Peer-reviewed

Kunihiro Tanaka, Tatsuya Nakazawa, Koichi Sakairi, Yutaka Sato, Hiroyuki Kokawa, Toshihiro Omori, Kiyohito Ishida

FRICTION STIR WELDING AND PROCESSING IX　29-35　2017

DOI： 10.1007/978-3-319-52383-5_4 　

ISSN： 2367-1181

Performance of Tungsten-Based Alloy Tool Developed for Friction Stir Welding of Austenitic Stainless Steel Peer-reviewed

Yutaka Sato, Ayuri Tsuji, Tomohiro Takida, Akihiko Ikegaya, Akinori Shibata, Hiroshi Ishizuka, Hideki Moriguchi, Shinichi Susukida, Hiroyuki Kokawa

FRICTION STIR WELDING AND PROCESSING IX　47-52　2017

DOI： 10.1007/978-3-319-52383-5_6 　

ISSN： 2367-1181

Influence of Underwater Operation on Friction Stir Welding of Medium Carbon Steel Peer-reviewed

Tomoko Miyamori, Yutaka Sato, Hiroyuki Kokawa

FRICTION STIR WELDING AND PROCESSING IX　23-28　2017

DOI： 10.1007/978-3-319-52383-5_3 　

ISSN： 2367-1181

Effect of additional element on interfacial strength at Al/Fe dissimilar metal weld by TIG arc brazing Peer-reviewed

Hiroki Furuya, Yoshikatsu Sato, Yutaka S. Sato, Hiroyuki Kokawa, Yujiro Tatsumi

Proceedings of 10th International Conference on Trends in Welding Research and 9th International Welding Symposium of Japan Welding Symposium　794-797　2016/10

Effect of cooling rate on microstructure of friction-stir welded aluminum alloy 1100 Peer-reviewed

S. Mironov, D. Yi, Y.S. Sato, H. Kokawa

Proceedings of 10th International Conference on Trends in Welding Research and 9th International Welding Symposium of Japan Welding Symposium　733-736　2016/10

Microstrucutre and mechanical properties of friction stir processed ferritic steel Peer-reviewed

Lauri Luumi, Yutaka S. Sato, Hiroyuki Kokawa

Proceedings of 10th International Conference on Trends in Welding Research and 9th International Welding Symposium of Japan Welding Symposium　879-881　2016/10

Underwater friction stir welding of medium carbon steel Peer-reviewed

Tomoko Miyamori, Yutaka S. Sato, Hiroyuki Kokawa

Proceedings of 10th International Conference on Trends in Welding Research and 9th International Welding Symposium of Japan Welding Symposium　465-468　2016/10

Development of advanced W-based alloy tool for FSW of stainless steel Peer-reviewed

Ayuri Tsuji, Yutaka S. Sato, Hiroyuki Kokawa, Shinich Susukida, Hiroyuki Ishizuka, Hideki Moriguchi, Akinori Shibata, Akihiko Ikegaya, Tomohiro Takida

Proceedings of 10th International Conference on Trends in Welding Research and 9th International Welding Symposium of Japan Welding Symposium　462-464　2016/10

Properties of multilayer friction stir welding joint in SUS316L clad steel Peer-reviewed

Yuta Honma, Kunihiko Hashi, Rinzo Kayano, Yutaka S. Sato, Hiroyuki Kokawa

Proceedings of 10th International Conference on Trends in Welding Research and 9th International Welding Symposium of Japan Welding Symposium　871-874　2016/10

Weld formation in ultrasonic welding of Al alloy to Cu Peer-reviewed

Hiromichi T. Fujii, Hiroki Endo, Yutaka S. Sato, Hiroyuki Kokawa

Proceedings of 10th International Conference on Trends in Welding Research and 9th International Welding Symposium of Japan Welding Symposium　250-253　2016/10

Life prolongation of cobalt-based alloy tool during friction stir welding of medium carbon steel via microstructure modification Peer-reviewed

Yutaka S. Sato, Masahiro Miyake, Shinichi Susukida, Hiroyuki Kokawa, Toshihiro Omori, Kiyohito Ishida, Shinya Imano, Seung Hwan, C. Park, Itto Sugimoto, Satoshi Hirano

IIW Doc. IX-2584-16　1-9　2016/07

Wear of Cobalt-Based Alloy Tool During Friction Stir Welding of Ti-6Al-4V Alloy Peer-reviewed

Yutaka S. Sato, Shinichi Susukida, Hiroyuki Kokawa, Toshihiro Omori, Kiyohito Ishida, Shinya Imano, Seung Hwan, C. Park, Itto Sugimoto, Satoshi Hirano

Proceedings of 11th International Friction Stir Welding Symposium, Cambridge, UK, 17-19 May 2016　CD-ROM　2016/05

Performance of iridium containing nickel base superalloy tool for friction stir welding of Ti-6Al-4V alloy Peer-reviewed

Tatsuya Nakazawa, Kunihiro Tanaka, Koichi Sakairi, Yutaka S. Sato, Hiroyuki Kokawa, Toshihiro Omori, Kiyohito Ishida, Satoshi Hirano

Proceedings of 11th International Friction Stir Welding Symposium, Cambridge, UK, 17-19 May 2016　CD-ROM　2016/05

Microstructure and lap shear strength of the weld interface in ultrasonic welding of Al alloy to stainless steel Peer-reviewed

Hiromichi T. Fujii, Yuta Goto, Yutaka S. Sato, Hiroyuki Kokawa

SCRIPTA MATERIALIA　116　135-138　2016/04

DOI： 10.1016/j.scriptamat.2016.02.004 　

ISSN： 1359-6462

Influencing factors on nugget formation during multipoint welding by single side resistance spot welding

Hitomi Nishibata, Shota Kikuchi, Masato Uchihara, Yutaka S. Sato, Hiroyuki Kokawa

Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society　34　(1)　42-49　2016

DOI： 10.2207/qjjws.34.42 　

ISSN： 0288-4771

片側スポット多点溶接におけるナゲット形成挙動への影響因子の検討 Peer-reviewed

西畑ひとみ, 菊池庄太, 福本学, 内原正人, 佐藤裕, 粉川博之

溶接学会論文集　34　(1)　42-49　2016/01

Effect of cooling rate on microstructure of friction-stir welded AA1100 aluminum alloy Peer-reviewed

D. Yi, S. Mironov, Y. S. Sato, H. Kokawa

PHILOSOPHICAL MAGAZINE　96　(18)　1965-1977　2016

DOI： 10.1080/14786435.2016.1185186 　

ISSN： 1478-6435

eISSN： 1478-6443

Mechanical Properties and Microstructure of Dissimilar Friction Stir Welds of 11Cr-Ferritic/Martensitic Steel to 316 Stainless Steel Peer-reviewed

Yutaka S. Sato, Hiroyuki Kokawa, Hiromichi T. Fujii, Yasuhide Yano, Yoshihiro Sekio

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE　46A　(12)　5789-5800　2015/12

DOI： 10.1007/s11661-015-3152-5 　

ISSN： 1073-5623

eISSN： 1543-1940

Effect of post-GBE strain on weld decay resistance of grain boundary engineered 304 austenitic stainless steel Peer-reviewed

S. Tokita, M. Ikeshoji, G. Yamada, K. Kurihara, H. Kokawa, Y. S. Sato, H. T. Fujii

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING　20　(8)　702-707　2015/11

DOI： 10.1179/1362171815Y.0000000061 　

ISSN： 1362-1718

eISSN： 1743-2936

Microstructure evolution during friction-stir welding of AZ31 magnesium alloy Peer-reviewed

S. Mironov, T. Onuma, Y. S. Sato, H. Kokawa

ACTA MATERIALIA　100　301-312　2015/11

DOI： 10.1016/j.actamat.2015.08.066 　

ISSN： 1359-6454

eISSN： 1873-2453

Microstructure and mechanical properties in dissimilar friction stir butt weld between austenitic stainless steel and ferritic heat-resistant steel Peer-reviewed

Y.S. Sato, H. Kokawa, H.T. Fujii, Y. Yano, Y. Sekio

IIW Doc. IX-2531-15　1-6　2015/07

A study of friction stir welding for clad pipelines Peer-reviewed

T. Katayama, Y. Kisaka, F. Kimura, Y.S. Sato, H. Kokawa

Friction Stir Welding and Processing VIII, Published by John Wiley & Sons, Inc., Hoboken, NJ, USA　3-10　2015/03

Performance enhancement of Co-based alloy tool for friction stir welding of ferritic steel Peer-reviewed

Y.S. Sato, M. Miyake, S. Susukida, H. Kokawa, T. Omori, K. Ishida, S. Imano, S.H.C. Park, I. Sugimoto, S. Hirano

Friction Stir Welding and Processing VIII, Published by John Wiley & Sons, Inc., Hoboken, NJ, USA　39-46　2015/03

Friction stir welding of steels using a tool made of iridium-containing nickel base superalloy Peer-reviewed

T. Nakazawa, Y.S. Sato, H. Kokawa, K. Ishida, T. Omori, K. Tanaka, K. Sakairi

Friction Stir Welding and Processing VIII, Published by John Wiley & Sons, Inc., Hoboken, NJ, USA　77-82　2015/03

Effect of Welding Temperature on Microstructure of Friction-stir Welded Aluminum Alloy 1050 Peer-reviewed

Sergey Mironov, Kosuke Inagaki, Yutaka S. Sato, Hiroyuki Kokawa

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE　46A　(2)　783-790　2015/02

DOI： 10.1007/s11661-014-2651-0 　

ISSN： 1073-5623

eISSN： 1543-1940

Microstructural evolution of pure copper during friction-stir welding Peer-reviewed

S. Mironov, K. Inagaki, Y. S. Sato, H. Kokawa

PHILOSOPHICAL MAGAZINE　95　(4)　367-381　2015/02

DOI： 10.1080/14786435.2015.1006293 　

ISSN： 1478-6435

eISSN： 1478-6443

Mechanism of weld formation during very-high-power ultrasonic additive manufacturing of Al alloy 6061 Peer-reviewed

S. Shimizu, H. T. Fujii, Y. S. Sato, H. Kokawa, M. R. Sriraman, S. S. Babu

ACTA MATERIALIA　74　234-243　2014/08

DOI： 10.1016/j.actamat.2014.04.043 　

ISSN： 1359-6454

eISSN： 1873-2453

A Study of Friction Stir Welding for Clad Pipelines Peer-reviewed

T. Katayama, Y. Kisaka, F. Kimura, Y.S. Sato, H. Kokawa

IIW Doc. XII-2177-14　2014　1-14　2014/07

DOI： 10.14920/jwstaikai.2014f.0_12 　

Microstructure and mechnanical properties of friction stir welded 11Cr-ferritic/martensitic steel Peer-reviewed

Y.S. Sato, H. Kokawa, Y. Yano, Y. Sekio

IIW Doc. IX-2476-14　1-6　2014/07

Bond formation between Al tapes during very high power ultrasonic additive manufacturing Peer-reviewed

H.T. Fujii, S. Shimizu, Y.S. Sato, H. Kokawa, S.M. Ramanujam, S.S. Babu

IIW Doc. IX-2484-14　1-8　2014/07

Tool material factors for suppression of wear in Co-based alloy tool during friction stir welding of 0.45C steel Peer-reviewed

Y.S. Sato, M. Miyake, H. Kokawa, T. Omori, K. Ishida, S. Imano, I. Sugimoto, S.H.C. Park, S. Hirano

Proceedings of 10th International Friction Stir Welding Symposium, Beijing, China, 20-22 May 2014　CD-ROM　2014/05

Microstructural aspects of friction stir welding Peer-reviewed

S. Mironov, Y.S. Sato, H. Kokawa

Proceedings of 10th International Friction Stir Welding Symposium, Beijing, China, 20-22 May 2014　CD-ROM　2014/05

Microstructure evolution of the Invar 36 alloy FSW joint Peer-reviewed

A. Wu, Y. Zhao, G. Zou, Y.S. Sato, H. Kokawa

Proceedings of 10th International Friction Stir Welding Symposium, Beijing, China, 20-22 May 2014　CD-ROM　2014/05

Effect of second pass in 2-sided FSW of high strength structural steel Peer-reviewed

L. Luumi, P. Vilaca, Y.S. Sato, H. Hanninen, H. Kokawa

Proceedings of 10th International Friction Stir Welding Symposium, Beijing, China, 20-22 May 2014　CD-ROM　2014/05

Effect of swaging on Young's modulus of beta Ti-33.6Nb-4Sn alloy Peer-reviewed

Shuji Hanada, Naoya Masahashi, Taek Kyun Jung, Masahiro Miyake, Yutaka S. Sato, Hiroyuki Kokawa

JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS　32　310-320　2014/04

DOI： 10.1016/j.jmbbm.2013.10.027 　

ISSN： 1751-6161

eISSN： 1878-0180

Microstructural evolution in dissimilar joint of Al alloy and Cu during ultrasonic welding Peer-reviewed

H.T. Fujii, Y. Goto, Y.S. Sato, H. Kokawa

Materials Science Forum　783-786　2747-2752　2014

DOI： 10.4028/www.scientific.net/MSF.783-786.2747 　

Structural response of metals to friction-stir welding Peer-reviewed

S. Mironov, Y.S. Sato, H. Kokawa

Letters on materials　4　(2)　108-113　2014

Microstructure and properties in friction stir weld of 12Cr steel Peer-reviewed

P. Hua, S. Moronov, C. Z. Nie, Y. S. Sato, H. Kokawa, S. H. C. Park, S. Hirano

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING　19　(1)　76-81　2014/01

DOI： 10.1179/1362171813Y.0000000167 　

ISSN： 1362-1718

Development of grain structure during friction-stir welding of Cu-30Zn brass Peer-reviewed

S. Mironov, K. Inagaki, Y. S. Sato, H. Kokawa

PHILOSOPHICAL MAGAZINE　94　(27)　3137-3148　2014

DOI： 10.1080/14786435.2014.951712 　

ISSN： 1478-6435

eISSN： 1478-6443

Mechanical properties of friction stir welded 11Cr-ferritic/martensitic steel Peer-reviewed

Y. Yano, Y. S. Sato, Y. Sekio, S. Ohtsuka, T. Kaito, R. Ogawa, H. Kokawa

JOURNAL OF NUCLEAR MATERIALS　442　(1-3)　S524-S528　2013/11

DOI： 10.1016/j.jnucmat.2012.10.038 　

ISSN： 0022-3115

eISSN： 1873-4820

Grain Structure Development During Friction Stir Welding of Single-Crystal Austenitic Stainless Steel Peer-reviewed

Jong Jin Jeon, Sergey Mironov, Yutaka S. Sato, Hiroyuki Kokawa, Seung Hwan C. Park, Satoshi Hirano

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE　44A　(7)　3157-3166　2013/07

DOI： 10.1007/s11661-013-1692-0 　

ISSN： 1073-5623

eISSN： 1543-1940

Anisotropy of structural response of single crystal austenitic stainless steel to friction stir welding Peer-reviewed

J. Jeon, S. Mironov, Y. S. Sato, H. Kokawa, S. H. C. Park, S. Hirano

ACTA MATERIALIA　61　(9)　3465-3472　2013/05

DOI： 10.1016/j.actamat.2013.02.039 　

ISSN： 1359-6454

Effect of post-GBE strain-sensitisation on corrosion resistance of grain boundary engineered 304 austenitic stainless steel Peer-reviewed

Gouki Yamada, Hiroyuki Kokawa, Yu Yasuda, Shun Tokita, Takashi Yokoyama, Yutaka S. Sato, Hiromichi T. Fujii, Sadahiro Tsurekawa

PHILOSOPHICAL MAGAZINE　93　(10-12)　1443-1453　2013/04

DOI： 10.1080/14786435.2012.762467 　

ISSN： 1478-6435

Temperature and force response characteristics of friction stir welding on Invar 36 alloy Peer-reviewed

Y. Zhao, A. P. Wu, J. L. Ren, Y. S. Sato, H. Kokawa, M. Miyake, D. Y. Yan

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING　18　(3)　232-238　2013/04

DOI： 10.1179/1362171812Y.0000000077 　

ISSN： 1362-1718

eISSN： 1743-2936

Texture Produced by Abnormal Grain Growth in Friction Stir-Welded Aluminum Alloy 1050 Peer-reviewed

Sergey Mironov, Kunitaka Masaki, Yutaka S. Sato, Hiroyuki Kokawa

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE　44A　(3)　1153-1157　2013/03

DOI： 10.1007/s11661-012-1596-4 　

ISSN： 1073-5623

Effect of welding parameters on the microstructure and mechanical properties of a friction stir welded 11Cr-ferritic/martensitic steel Invited Peer-reviewed

Y.S. Sato, H. Kokawa, Y. Yano, Y. Sekio

Friction Stir Welding and Processing VII, Published by John Wiley & Sons, Inc., Hoboken, NJ, USA　91-99　2013/03

Friction-stir-welding of thick carbon steels using Co-based alloy tool Peer-reviewed

I Sugimoto, A. Sato, S.H.C. Park, S. Hirano, S. Imano, Y.S. Sato, H. Kokawa, T. Omori, K. Ishida

Friction Stir Welding and Processing VII, Published by John Wiley & Sons, Inc., Hoboken, NJ, USA　101-106　2013/03

Interface microstructure and mechanical properties of dissimilar joint between 6061 Al alloy and 304 stainless steel by ultrasonic welding Peer-reviewed

H.T. Fujii, Y. Goto, Y.S. Sato, H. Kokawa

IIW documents　(IX-2445-13)　1-8　2013

Friction stir welding of single crystal austenitic stainless steel Peer-reviewed

K. Ikeda, J. J. S. Jeon, S. Mironov, Y. S. Sato, H. T. Fujii, H. Kokawa, S. H. C. Park, S. Hirano

PROCEEDINGS OF THE 1ST INTERNATIONAL JOINT SYMPOSIUM ON JOINING AND WELDING　449-451　2013

Friction stir welding of grain boundary engineered 304 austenitic stainless steel Peer-reviewed

S. Tokita, T. Yokoyama, H. Kokawa, Y. S. Sato, H. T. Fujii

PROCEEDINGS OF THE 1ST INTERNATIONAL JOINT SYMPOSIUM ON JOINING AND WELDING　407-409　2013

Effect of peak temperature during friction stir welding on microstructure evolution of aluminum alloy 1050 Peer-reviewed

K. Inagaki, S. Mironov, Y. S. Sato, H. T. Fujii, H. Kokawa

PROCEEDINGS OF THE 1ST INTERNATIONAL JOINT SYMPOSIUM ON JOINING AND WELDING　41-44　2013

Microstructure evolution of metallic materials during friction stir welding Peer-reviewed

H. Kokawa, Y. S. Sato, S. Mironov

PROCEEDINGS OF THE 1ST INTERNATIONAL JOINT SYMPOSIUM ON JOINING AND WELDING　5-13　2013

Relationship between material flow and abnormal grain growth in friction-stir welds Peer-reviewed

S. Mironov, K. Masaki, Y. S. Sato, H. Kokawa

SCRIPTA MATERIALIA　67　(12)　983-986　2012/12

DOI： 10.1016/j.scriptamat.2012.09.002 　

ISSN： 1359-6462

Microstructural studies of friction stir welded Zircaloy-4 Peer-reviewed

Yutaka S. Sato, Yoshito Nagahama, Sergey Mironov, Hiroyuki Kokawa, Seung Hwan C. Park, Satoshi Hirano

SCRIPTA MATERIALIA　67　(3)　241-244　2012/08

DOI： 10.1016/j.scriptamat.2012.04.029 　

ISSN： 1359-6462

Microstructural evolution during tool plunging stage of friction stir welding in single crystal austenitic stainless steel Peer-reviewed

J. Jeon, S. Mironov, Y.S. Sato, H. Kokawa, S.H.C. Park, S. Hirano

IIW Document IX-2392-12　1-5　2012/07

Effect of Welding Parameters of Friction Stir Welded High Nitrogen Steel Peer-reviewed

Yutaka S. Sato, Kei Nakamura, Hiroyuki Kokawa

Proceedings of 9th International Conference on Trends in Welding Research, Chicago, Illinois, USA　in press　2012/06

Material properties governing wear of Co-based alloy tool during friction stir welding of steels Peer-reviewed

Masahiro Miyake, Yutaka S. Sato, Hiroyuki Kokawa, Yoshikazu Takaku, Toshihiro Omori, Kiyohito Ishida, Shinya Imano, Seung Hwan, C. Park, Satoshi Hirano

Proceedings of 9th International Friction Stir Welding Symposium, Huntsville, Alabama, USA　CD-R　2012/05

EBSD study of recrystallization in friction-stirred superaustenitic stainless steel Peer-reviewed

S. Mironov, Y.S. Sato, H. Kokawa

Proceedings of 9th International Friction Stir Welding Symposium, Huntsville, Alabama, USA　CD-R　2012/05

Hardness and micro-texture in friction stir welds of a nanostructured oxide dispersion strengthened ferritic steel Peer-reviewed

Wentuo Han, Shigeharu Ukai, Farong Wan, Yutaka Sato, Bin Leng, Hiroya Numata, Naoko Oono, Shigenari Hayashi, Qingxin Tang, Yoshito Sugino

Materials Transactions　53　(2)　390-394　2012

DOI： 10.2320/matertrans.M2011226 　

ISSN： 1345-9678

Evaluation of texture developed in high-temperature beta-phase during friction stir welding of Ti-6Al-4V Peer-reviewed

S. Mironov, Y. S. Sato, H. Kokawa

MATERIALS INTEGRATION　508　106-111　2012

DOI： 10.4028/www.scientific.net/KEM.508.106 　

ISSN： 1013-9826

Texture Development during Friction Stir Welding of Magnesium Alloys Peer-reviewed

Hiroyuki Kokawa, Yutaka S. Sato, Sergey Mironov

TEXTURES OF MATERIALS, PTS 1 AND 2　702-703　43-47　2012

DOI： 10.4028/www.scientific.net/MSF.702-703.43 　

ISSN： 0255-5476

High-speed TSV filling with molten solder Peer-reviewed

Young-Ki Ko, Hiromichi T. Fujii, Yutaka S. Sato, Chang-Woo Lee, Sehoon Yoo

MICROELECTRONIC ENGINEERING　89　62-64　2012/01

DOI： 10.1016/j.mee.2011.01.030 　

ISSN： 0167-9317

Friction-Stir Welding of High-Softening-Temperature Materials using Cobalt-Based Alloy Tool Peer-reviewed

Seung Hwan C. Park, Satoshi Hirano, Shinya Imano, Yutaka S. Sato, Hiroyuki Kokawa, Toshihiro Omori, Kiyohito Ishida

THERMEC 2011, PTS 1-4　706-709　996-+　2012

DOI： 10.4028/www.scientific.net/MSF.706-709.996 　

ISSN： 0255-5476

Fracture toughness of friction stir welded Invar 36 alloy at low temperature

Yue Zhao, Aiping Wu, Yutaka S. Sato, Hiroyuki Kokawa

Hanjie Xuebao/Transactions of the China Welding Institution　32　(12)　89-92　2011/12

ISSN： 0253-360X

Friction stir spot welding of single-crystal austenitic stainless steel Peer-reviewed

J. Jeon, S. Mironov, Y. S. Sato, H. Kokawa, S. H. C. Park, S. Hirano

ACTA MATERIALIA　59　(20)　7439-7449　2011/12

DOI： 10.1016/j.actamat.2011.09.013 　

ISSN： 1359-6454

SYSTEMATIC EXAMINATION OF PRECIPITATION PHENOMENA ASSOCIATIED WITH HARDNESS AND CORROSION PROPERTIES IN FRICTION STIR WELDED ALUMINIUM ALLOY 2024 Peer-reviewed

Y. S. Sato, S. Kurihara, H. Kokawa

WELDING IN THE WORLD　55　(11-12)　39-47　2011/11

DOI： 10.1007/BF03321541 　

ISSN： 0043-2288

Microstructure and properties of friction stir welded high strength Fe-36 wt%Ni alloy Peer-reviewed

Yue Zhao, Yutaka S. Sato, Hiroyuki Kokawa, Aiping Wu

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING　528　(25-26)　7768-7773　2011/09

DOI： 10.1016/j.msea.2011.06.082 　

ISSN： 0921-5093

Structural response of superaustenitic stainless steel to friction stir welding Peer-reviewed

S. Mironov, Y. S. Sato, H. Kokawa, H. Inoue, S. Tsuge

ACTA MATERIALIA　59　(14)　5472-5481　2011/08

DOI： 10.1016/j.actamat.2011.05.021 　

ISSN： 1359-6454

Microstructural Characterizations Following Friction Stir Welding of Dissimilar Alloys of Low- and High-Carbon Steels Peer-reviewed

Don Hyun Choi, Byung Wook Ahn, Yun Mo Yeon, Seung Hwan C. Park, Yutaka S. Sato, Hiroyuki Kokawa, Seung Boo Jung

MATERIALS TRANSACTIONS　52　(7)　1500-1505　2011/07

DOI： 10.2320/matertrans.M2010438 　

ISSN： 1345-9678

eISSN： 1347-5320

Grain boundary engineering of titanium-stabilized 321 austenitic stainless steel Peer-reviewed

K. Kurihara, H. Kokawa, S. Sato, Y. S. Sato, H. T. Fujii, M. Kawai

JOURNAL OF MATERIALS SCIENCE　46　(12)　4270-4275　2011/06

DOI： 10.1007/s10853-010-5244-3 　

ISSN： 0022-2461

Microstructure and Mechanical Properties of Friction Stir Welded High-Strength Steel for Drilling Pipe Peer-reviewed

Sangchul K. Lee, Yutaka S. Sato, Hiroyuki Kokawa, Jongsub Lee, Wonbae Lee, Minhyun Cho

Proceedings of the Twenty-first (2011) International Offshore and Polar Engineering Conference　IV　501-505　2011/06

Friction Stir Welding of Titanium Alloy using a Cobalt-based Alloy Tool Peer-reviewed

Seung Hwan, C. Park, Toshito Nagahama, Satoshi Hirano, Shinya Imano, Yutaka S. Sato, Hiroyuki Kokawa, Toshihiro Omori, Kiyohito Ishida

Proceedings of the 12th World Conference on Titanium　1616-1620　2011/06

Advanced TSV filling method with Sn alloy and its reliability Peer-reviewed

Young-Ki Ko, Myong-Suk Kang, Hiroyuki Kokawa, Yutaka S. Sato, Sehoon Yoo, Chang-Woo Lee

2011 IEEE International 3D Systems Integration Conference, 3DIC 2011　2011

DOI： 10.1109/3DIC.2012.6262988 　

DEFORMATION BEHAVIOR OF FRICTION STIR PROCESSED MAGNESIUM ALLOYS\ Peer-reviewed

Q. Yang, S. Mironov, Y. S. Sato, K. Okamoto

MAGNESIUM TECHNOLOGY 2011　199-203　2011

ISSN： 1545-4150

Advanced Solder TSV Filling Technology Developed with Vacuum and Wave Soldering Peer-reviewed

Young-Ki Ko, Hiromichi T. Fujii, Yutaka S. Sato, Chang-Woo Lee, Sehoon Yoo

2011 IEEE 61ST ELECTRONIC COMPONENTS AND TECHNOLOGY CONFERENCE (ECTC)　2091-2095　2011

ISSN： 0569-5503

Tool Wear and Reactions in 304 Stainless Steel During Friction Stir Welding Peer-reviewed

Yutaka S. Sato, Masahiro Muraguchi, Hiroyuki Kokawa

ADVANCED MATERIAL SCIENCE AND TECHNOLOGY, PTS 1 AND 2　675-677　731-+　2011

DOI： 10.4028/www.scientific.net/MSF.675-677.731 　

ISSN： 0255-5476

Microstructure and mechanical properties of Nd:YAG laser welded Invar 36 alloy Peer-reviewed

Yue Zhao, Aiping Wu, Wei Yao, Zhimin Wang, Yutaka S. Sato, Hiroyuki Kokawa

ADVANCED MATERIAL SCIENCE AND TECHNOLOGY, PTS 1 AND 2　675-677　739-+　2011

DOI： 10.4028/www.scientific.net/MSF.675-677.739 　

ISSN： 0255-5476

DEVELOPMENT OF A COBALT-BASED ALLOY FSW TOOL FOR HIGH-SOFTENING-TEMPERATURE MATERIALS Peer-reviewed

Yutaka S. Sato, Masahiro Miyake, Hiroyuki Kokawa, Toshihiro Omori, Kiyohito Ishida, Shinya Imano, Seung Hwan C. Park, Satoshi Hirano

FRICTION STIR WELDING AND PROCESSING VI　3-9　2011

Microstructural evolution during friction stir welding of Ti-15V-3Cr-3Al-3Sn alloy Peer-reviewed

S. Mironov, Y. S. Sato, H. Kokawa

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING　527　(29-30)　7498-7504　2010/11

DOI： 10.1016/j.msea.2010.08.074 　

ISSN： 0921-5093

Microstructural Evolution during Friction Stir Welding of Ti-6Al-4V Alloy Peer-reviewed

Sergey Mironov, Yutaka Sato, Hiroyuki Kokawa

STEEL RESEARCH INTERNATIONAL　81　(9)　1100-1103　2010/09

ISSN： 1611-3683

eISSN： 1869-344X

Grain structure and microtexture in friction stir welded commercial purity titanium Peer-reviewed

Y. Zhang, Y. S. Sato, H. Kokawa, S. H. C. Park, S. Hirano

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING　15　(6)　500-505　2010/08

DOI： 10.1179/136217110X12785889549624 　

ISSN： 1362-1718

Systematic examination of precipitation phenomena associated with hardness and corrosion properties in friction stir welded aluminum alloy 2024 Peer-reviewed

S. Kurihara, Y.S. Sato, H. Kokawa

IIW Document IX-2339-10　1-14　2010/07

Material flow during friction stir spot welding Peer-reviewed

Q. Yang, S. Mironov, Y. S. Sato, K. Okamoto

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING　527　(16-17)　4389-4398　2010/06

DOI： 10.1016/j.msea.2010.03.082 　

ISSN： 0921-5093

Effect of interfacial microstructure on lap shear strength of friction stir spot weld of aluminium alloy to magnesium alloy Invited Peer-reviewed

Y. S. Sato, A. Shiota, H. Kokawa, K. Okamoto, Q. Yang, C. Kim

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING　15　(4)　319-324　2010/05

DOI： 10.1179/136217109X12568132624208 　

ISSN： 1362-1718

Effect of fixed location variation in friction stir welding of steels with different carbon contents Invited Peer-reviewed

D. -H. Choi, C. -Y. Lee, B. -W. Ahn, Y. -M. Yeon, S. -H. C. Park, Y. -S. Sato, H. Kokawa, S. -B. Jung

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING　15　(4)　299-304　2010/05

DOI： 10.1179/136217109X12577814486737 　

ISSN： 1362-1718

eISSN： 1743-2936

Precipitation phenomena in friction stir welded 6000-series aluminium alloy with paint-bake hardening response Peer-reviewed

Y.S. Sato, N. Abe, U.F.H.R. Suhuddin, H. Kokawa

Proceedings of the 8th International Friction Stir Welding Symposium, Timmendorfer Strand, Germany　CD-ROM　2010/05

Pin breakage during friction stir welding of Al alloy Peer-reviewed

M. Miyake, Y.S. Sato, H. Kokawa

Proceedings of the 8th International Friction Stir Welding Symposium, Timmendorfer Strand, Germany　CD-ROM　2010/05

Specific Character of Material Flow in Near-Surface Layer during Friction Stir Processing of AZ31 Magnesium Alloy Peer-reviewed

S. Mironov, Q. Yang, H. Takahashi, I. Takahashi, K. Okamoto, Y. S. Sato, H. Kokawa

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE　41A　(4)　1016-1024　2010/04

DOI： 10.1007/s11661-009-0158-x 　

ISSN： 1073-5623

Grain structure and texture evolution during friction stir welding of thin 6016 aluminum alloy sheets Peer-reviewed

U. F. H. R. Suhuddin, S. Mironov, Y. S. Sato, H. Kokawa

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING　527　(7-8)　1962-1969　2010/03

DOI： 10.1016/j.msea.2009.11.029 　

ISSN： 0921-5093

Grain Structure Formation Ahead of Tool During Friction Stir Welding of AZ31 Magnesium Alloy Peer-reviewed

U. Suhuddin, S. Mironov, H. Takahashi, Y. Sato, H. Kokawa, C. -W. Lee

TEXTURE AND ANISOTROPY OF POLYCRYSTALS III　160　313-+　2010

DOI： 10.4028/www.scientific.net/SSP.160.313 　

ISSN： 1012-0394

Friction Stir Spot Welding Phenomena in Al Alloy 6061 Peer-reviewed

Yutaka S. Sato, Mitsuo Fujimoto, Natsumi Abe, Hiroyuki Kokawa

THERMEC 2009, PTS 1-4　638-642　1243-+　2010

DOI： 10.4028/www.scientific.net/MSF.638-642.1243 　

ISSN： 0255-5476

Metallographic Study of Lapped FSW between Ductile Cast Iron and Austenite Type Stainless Steel Peer-reviewed

Mitsuru Nakamura, Yu-ki Sawada, Yutaka S. Sato

THERMEC 2009, PTS 1-4　638-642　1197-+　2010

DOI： 10.4028/www.scientific.net/MSF.638-642.1197 　

ISSN： 0255-5476

Superplasticity of a Sc and Zr modified Al-6%Cu alloy subjected to ECAE Peer-reviewed

I. Nikulin, R. Kaibyshev, S. Mironov, Y. S. Sato, H. Kokawa, Y. Motohashi

THERMEC 2009, PTS 1-4　638-642　291-+　2010

DOI： 10.4028/www.scientific.net/MSF.638-642.291 　

ISSN： 0255-5476

Improvement of Transpassive Intergranular Corrosion Resistance of 304 Austenitic Stainless Steel by Thermomechanical Processing for Twin-induced Grain Boundary Engineering Peer-reviewed

Wei Zhong Jin, Hiroyuki Kokawa, Zhan Jie Wang, Yutaka S. Sato, Nobuyoshi Hara

ISIJ INTERNATIONAL　50　(3)　476-481　2010

DOI： 10.2355/isijinternational.50.476 　

ISSN： 0915-1559

Microstructural Evolution of DP980 Steel during Friction Bit Joining Peer-reviewed

T. Huang, Y. S. Sato, H. Kokawa, M. P. Miles, K. Kohkonen, B. Siemssen, R. J. Steel, S. Packer

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE　40A　(12)　2994-3000　2009/12

DOI： 10.1007/s11661-009-0016-x 　

ISSN： 1073-5623

Grain Refinement by Friction Stir Processing Peer-reviewed

S. Mironov, K. Masaki, Y.S. Sato, H. Kokawa

Proceedings of the 18th Conference on Processing and Fabrication of Advanced Materials (PFAM XVIII), edited by M. Niinomi, M. Morinaga, M. Nakai, N. Bhatnagar, T.S. Srivatsan, JSPS, December 12-14, 2009, Sendai　1973-1980　2009/12

Grain Boundary Engineering of Austenitic Stainless Steels Peer-reviewed

H. Kokawa, M. Michiuchi, M. Shimada, Y.S. Sato, Z.J. Wang

Proceedings of the 18th Conference on Processing and Fabrication of Advanced Materials (PFAM XVIII), edited by M. Niinomi, M. Morinaga, M. Nakai, N. Bhatnagar, T.S. Srivatsan, JSPS, December 12-14, 2009, Sendai　517-526　2009/12

Grain structure evolution during friction-stir welding of AZ31 magnesium alloy Peer-reviewed

U. F. H. R. Suhuddin, S. Mironov, Y. S. Sato, H. Kokawa, C. -W. Lee

ACTA MATERIALIA　57　(18)　5406-5418　2009/10

DOI： 10.1016/j.actamat.2009.07.041 　

ISSN： 1359-6454

Development of grain structure during friction stir welding of pure titanium Peer-reviewed

S. Mironov, Y. S. Sato, H. Kokawa

ACTA MATERIALIA　57　(15)　4519-4528　2009/09

DOI： 10.1016/j.actamat.2009.06.020 　

ISSN： 1359-6454

Microstructural Characterization of High-Strength Steel Lap Joint Produced by Friction Spot Joining Peer-reviewed

R. Ohashi, M. Fujimoto, S. Mironov, Y. S. Sato, H. Kokawa

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE　40A　(9)　2033-2035　2009/09

DOI： 10.1007/s11661-009-9892-3 　

ISSN： 1073-5623

Reactions during friction stir welding of 304 stainless steel using several welding tool materials Peer-reviewed

Y.S. Sato, M. Muraguchi, H. Kokawa

Proceedings of Asia Steel 2009　2009/05

Effect of contamination on microstructure in friction stir spot welded DP590 steel Invited Peer-reviewed

R. Ohashi, M. Fujimoto, S. Mironov, Y. S. Sato, H. Kokawa

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING　14　(3)　221-227　2009/04

DOI： 10.1179/136217108X388642 　

ISSN： 1362-1718

Evaluation of microstructure and properties in friction stir welded superaustenitic stainless steel Invited Peer-reviewed

Y. S. Sato, N. Harayama, H. Kokawa, H. Inoue, Y. Tadokoro, S. Tsuge

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING　14　(3)　202-209　2009/04

DOI： 10.1179/136217108X386518 　

ISSN： 1362-1718

Boride Formation Induced by pcBN Tool Wear in Friction-Stir-Welded Stainless Steels Peer-reviewed

Seung Hwan C. Park, Yutaka S. Sato, Hiroyuki Kokawa, Kazutaka Okamoto, Satoshi Hirano, Masahisa Inagaki

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE　40A　(3)　625-636　2009/03

DOI： 10.1007/s11661-008-9709-9 　

ISSN： 1073-5623

EFFECT OF TEXTURE ON FRACTURE LIMIT STRAIN IN FRICTION STIR PROCESSED AZ31B MG ALLOY Invited Peer-reviewed

Yutaka S. Sato, Akihiro Sugimoto, Hiroyuki Kokawa, Chang-Woo Lee

MATERIALS PROCESSING AND TEXTURE　200　43-52　2009

ISSN： 1042-1122

Solid state spot joining of sheet materials using consumable bit Peer-reviewed

M. P. Miles, K. Kohkonen, S. Packer, R. Steel, B. Siemssen, Y. S. Sato

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING　14　(1)　72-77　2009/01

DOI： 10.1179/136217108X341193 　

ISSN： 1362-1718

MICROSTRUCTURE AND PROPERTIES OF FRICTION STIR WELDED 1.3WT% N CONTAINING STEEL Invited Peer-reviewed

Yutaka S. Sato, Kei Nakamura, Hiroyuki Kokawa, Shuji Narita, Tetsuya Shimizu

FRICTION STIR WELDING AND PROCESSING V　67-+　2009

Microstructure and Mechanical Properties of Friction Stir Welded Ti-15V-3Al-3Cr-3Sn Alloy Peer-reviewed

Y. Zhang, Y. S. Sato, H. Kokawa, S. H. C. Park, S. Hirano

TRENDS IN WELDING RESEARCH　413-+　2009

DOI： 10.1361/cp2008twr413 　

Grain Boundary Engineering of Austenitic Stainless Steels Peer-reviewed

H. Kokawa, M. Michiuchi, M. Shimada, Z. J. Wang, Y. S. Sato

TRENDS IN WELDING RESEARCH　11-16　2009

DOI： 10.1361/cp2008twr011 　

Friction spot joining of high strength steel sheets for automotives Peer-reviewed

Ryoji Ohashi, Mitsuo Fujimoto, Sergey Mironov, Yutaka S. Sato, Hiroyuki Kokawa

Welding in the World　53　(5-6)　23-27　2009

DOI： 10.1007/BF03266711 　

ISSN： 0043-2288

Microstructural analysis of stir zone of Al alloy produced by friction stir spot welding Peer-reviewed

M. Fujimoto, S. Koga, N. Abe, Y. S. Sato, H. Kokawa

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING　13　(7)　663-670　2008/10

DOI： 10.1179/136217108X347601 　

ISSN： 1362-1718

Crystallography of transformed beta microstructure in friction stir welded Ti-6Al-4V alloy Peer-reviewed

S. Mironov, Y. Zhang, Y. S. Sato, H. Kokawa

SCRIPTA MATERIALIA　59　(5)　511-514　2008/09

DOI： 10.1016/j.scriptamat.2008.04.038 　

ISSN： 1359-6462

Stir zone microstructure of commercial purity titanium friction stir welded using pcBN tool Invited Peer-reviewed

Yu Zhang, Yutaka S. Sato, Hiroyuki Kokawa, Seung Hwan C. Park, Satoshi Hirano

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING　488　(1-2)　25-30　2008/08

DOI： 10.1016/j.msea.2007.10.062 　

ISSN： 0921-5093

Development of grain structure in beta-phase field during friction stir welding of Ti-6Al-4V alloy Peer-reviewed

S. Mironov, Y. Zhang, Y. S. Sato, H. Kokawa

SCRIPTA MATERIALIA　59　(1)　27-30　2008/07

DOI： 10.1016/j.scriptamat.2008.02.014 　

ISSN： 1359-6462

Microstructural evolution during friction stir-processing of pure iron Peer-reviewed

S. Mironov, Y. S. Sato, H. Kokawa

ACTA MATERIALIA　56　(11)　2602-2614　2008/06

DOI： 10.1016/j.actamat.2008.01.040 　

ISSN： 1359-6454

Microstructural characteristics and mechanical properties of Ti-6Al-4V friction stir welds Peer-reviewed

Yu Zhang, Yutaka S. Sato, Hiroyuki Kokawa, Seung Hwan C. Park, Satoshi Hirano

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING　485　(1-2)　448-455　2008/06

DOI： 10.1016/j.msea.2007.08.051 　

ISSN： 0921-5093

Friction Spot Joining of High Strength Steel Sheets for Automotives Peer-reviewed

R. Ohashi, M. Fujimoto, S. Mironov, Y.S. Sato, H. Kokawa

IIW Document III-1488-08　1-6　2008/06

Reaction in 304 austenitic stainless steel during friction stir welding using WC-based alloy tool Peer-reviewed

Y.S. Sato, M. Muraguchi, H. Kokawa

IIW Document IX-2272-08　1-9　2008/06

Microstructure and mechanical properties of friction stir spot welded AZ31 Mg alloy Peer-reviewed

Q. Yang, S. Mironov, Y.S. Sato, K. Okamoto

Proceedings of the 7th International Friction Stir Welding Symposium　CD-ROM　2008/05

Solid-state phase transformation of DP-590 steel during friction spot joining Peer-reviewed

S. Mironov, R. Ohashi, M. Fujimoto, Y.S. Sato, H. Kokawa

Proceedings of the 7th International Friction Stir Welding Symposium　CD-ROM　2008/05

Effect of microstructure on properties of friction stir welded Inconel Alloy 600 Peer-reviewed

Y. S. Sato, P. Arkom, H. Kokawa, T. W. Nelson, R. J. Steel

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING　477　(1-2)　250-258　2008/03

DOI： 10.1016/j.msea.2007.07.002 　

ISSN： 0921-5093

Experimental simulation of recrystallized microstructure in friction stir welded Al alloy using a plane-strain compression test Invited Peer-reviewed

Kunitaka Masaki, Yutaka S. Sato, Masakatsu Maeda, Hiroyuki Kokawa

SCRIPTA MATERIALIA　58　(5)　355-360　2008/03

DOI： 10.1016/j.scriptamat.2007.09.056 　

ISSN： 1359-6462

Reassessment of the effects of laser surface melting on IGC of SUS 304 Peer-reviewed

Sen Yang, Zhanjie Wang, Hiroyuki Kokawa, Yutaka S. Sato

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING　474　(1-2)　112-119　2008/02

DOI： 10.1016/j.msea.2007.03.103 　

ISSN： 0921-5093

Effect of twin-induced grain boundary engineering on intergranular corrosion propagation in 304 austenitic stainless steel Peer-reviewed

S. Sato, M. Miyagi, H. Kokawa, Z.J. Wang, Y.S. Sato

Proceedings of the 8th International Conference on Trends in Welding Research　in press　2008

Characteristics of microstructure in ultrahigh carbon steel produced during friction stir welding Peer-reviewed

Yutaka S. Sato, Hideaki Yamanoi, Hiroyuki Kokawa, Tadashi Furuhara

ISIJ INTERNATIONAL　48　(1)　71-76　2008

DOI： 10.2355/isijinternational.48.71 　

ISSN： 0915-1559

Analysis of plastic flow of the al alloy joint produced by friction stir spot welding Peer-reviewed

Mitsuo Fujimoto, Shinji Koga, Natsumi Abe, S. Yutaka Sato, Hiroyuki Kokawa

Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society　26　(1)　67-73　2008

DOI： 10.2207/qjjws.26.67 　

ISSN： 0288-4771

Experimental estimation of strain rate during FSW of Al-alloy using plane-strain compression Peer-reviewed

Kunitaka Masaki, Yutaka S. Sato, Masakatsu Maeda, Hiroyuki Kokawa

ADVANCED WELDING AND MICRO JOINING / PACKAGING FOR THE 21ST CENTURY　580-582　299-+　2008

ISSN： 0255-5476

Microstructural evolution in 304 austenitic stainless steel during friction stir welding Peer-reviewed

Hiroyuki Kokawa, Seung Hwan C. Park, Yutaka S. Sato, Kazutaka Okamoto, Satoshi Hirano, Masahisa Inagaki

ADVANCED WELDING AND MICRO JOINING / PACKAGING FOR THE 21ST CENTURY　580-582　9-+　2008

ISSN： 0255-5476

Effects of process time and thread on tensile shear strength of al alloy lap joint produced by friction stir spot welding Peer-reviewed

Mitsuo Fujimoto, Daisuke Watanabe, Natsumi Abe, Hiroyuki Kokawa, Yutaka Sato

Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society　26　(4)　253-258　2008

DOI： 10.2207/qjjws.26.253 　

ISSN： 0288-4771

Improvement of intergranular stress corrosion crack susceptibility of austenite stainless steel through grain boundary engineering Peer-reviewed

Weizhong Jin, Sen Yang, Hiroyuki Kokawa, Zhanjie Wang, Yutaka S. Sato

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY　23　(6)　785-789　2007/11

ISSN： 1005-0302

Multibody Joining: A New Method for Spot Joining of Sheet Materials Peer-reviewed

M.P. Miles, K. Kohkonen, B. Siemssen, R. Steel, S. Packer, Y.S. Sato

Proceedings of MS&T’07　227-234　2007/11

Arrest of weld-decay in 304 austenitic stainless steel by twin-induced grain boundary engineering Peer-reviewed

H. Kokawa, M. Shimada, M. Michluchi, Z. J. Wang, Y. S. Sato

ACTA MATERIALIA　55　(16)　5401-5407　2007/09

DOI： 10.1016/j.actamat.2007.06.005 　

ISSN： 1359-6454

Microstructural evolution of ultrahigh carbon steel during friction stir welding Peer-reviewed

Y. S. Sato, H. Yamanoi, H. Kokawa, T. Furuhara

SCRIPTA MATERIALIA　57　(6)　557-560　2007/09

DOI： 10.1016/j.scriptamat.2007.04.050 　

ISSN： 1359-6462

Grain growth phenomena in friction stir welded 1100 Al during post-weld heat treatment Invited Peer-reviewed

Y. S. Sato, H. Watanabe, H. Kokawa

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING　12　(4)　318-323　2007/07

DOI： 10.1179/174329307X197575 　

ISSN： 1362-1718

Grain boundary engineering of 304 austenitic stainless steel by laser surface melting and annealing Peer-reviewed

Sen Yang, Zhan Jie Wang, Hiroyuki Kokawa, Yutaka S. Sato

JOURNAL OF MATERIALS SCIENCE　42　(3)　847-853　2007/02

DOI： 10.1007/s10853-006-0063-2 　

ISSN： 0022-2461

Microstructure of friction-stir-welded high-nitrogen stainless steel Invited Peer-reviewed

S. H. C. Park, Y. S. Sato, H. Kokawa, K. Okamota, S. Hirano, M. Inagaki

THERMEC 2006, PTS 1-5　539-543　3757-+　2007

ISSN： 0255-5476

Enhancement of formability in magnesium alloy AZ31B via friction stir processing Invited Peer-reviewed

Y. S. Sato, A. Sasaki, A. Sugimoto, A. Honda, H. Kokawa

THERMEC 2006, PTS 1-5　539-543　3775-+　2007

ISSN： 0255-5476

Grain boundary engineering of high-nitrogen austenitic stainless steel Invited Peer-reviewed

H. Kokawa, W. Z. Jin, Z. J. Wang, M. Michiuchi, Y. S. Sato, W. Dong, Y. Katada

THERMEC 2006, PTS 1-5　539-543　4962-+　2007

ISSN： 0255-5476

Microstructure and properties of friction stir welded 304 stainless steel using W-BASED alloy tool Invited Peer-reviewed

Yutaka S. Sato, Masahiro Muraguchi, Hiroyuki Kokawa

FRICTION STIR WELDING AND PROCESSING IV　261-+　2007

Microstructural factors governing mechanical properties in friction stir welds Peer-reviewed

Yutaka S. Sato, Hiroyuki Kokawa

MECHANICAL BEHAVIOR OF MATERIALS X, PTS 1AND 2　345-346　1493-+　2007

ISSN： 1013-9826

Microstructural analysis of the stir zone of Al alloy produced by friction stir spot welding Peer-reviewed

Mitsuo Fujimoto, Shinji Koga, Natsumi Abe, Sato S. Yutaka, Hiroyuki Kokawa

Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society　25　(4)　553-559　2007

DOI： 10.2207/qjjws.25.553 　

ISSN： 0288-4771

Twin-induced grain boundary engineering for 316 austenitic stainless steel Peer-reviewed

M. Michiuchi, H. Kokawa, Z. J. Wang, Y. S. Sato, K. Sakai

ACTA MATERIALIA　54　(19)　5179-5184　2006/11

DOI： 10.1016/j.actamat.2006.06.030 　

ISSN： 1359-6454

Microstructural characteristics of dissimilar butt friction stir welds of AA7075 and AA2024 Peer-reviewed

Y.S. Sato, Y. Kurihara, H. Kokawa

Proceedings of 6th International FSW Symposim, St-Sauveur, Canada　CD-ROM　2006/10

Ultraprecision machining characteristics of poly-crystalline germanium Peer-reviewed

Jiwang Yan, Yasunori Takahashi, Jun'ichi Tamaki, Akihiko Kubo, Tsunemoto Kuriyagawa, Yutaka Sato

JSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing　49　(1)　63-69　2006/09/15

DOI： 10.1299/jsmec.49.63 　

ISSN： 1344-7653 1347-538X

Effect of microstructure on fracture limit strain of pseudo-plane strain deformation in friction stir welded Al alloy 5052

Yutaka Sato, Yusuke Sugiura, Hiroyuki Kokawa

Keikinzoku Yosetsu/Journal of Light Metal Welding and Construction　44　(5)　15-22　2006/05

ISSN： 0368-5306

AA5052摩擦攪拌接合部の擬平面ひずみ変形における破断限界ひずみに及ぼすミクロ組織の影響 Invited Peer-reviewed

佐藤 裕, 杉浦裕介, 粉川博之

軽金属溶接　44　(5)　195-202　2006/05

ISSN： 0368-5306

Forming property and microstructure in dissimilar thickness friction stir weld of Al alloy 5052 Peer-reviewed

Y. S. Sato, F. Yamashita, Y. Sugiura, H. Kokawa

SAE Technical Papers　2006-01-1393　2006

DOI： 10.4271/2006-01-1393 　

Microstructural evolution during friction stir welding of ultrafine grained Al alloys Invited Peer-reviewed

YS Sato, M Urata, Y Kurihara, SHC Park, H Kokawa, K Ikeda, N Tsuji

NANOMATERIALS BY SEVERE PLASTIC DEFORMATION　503-504　169-174　2006

ISSN： 0255-5476

Effect of threads on tool in friction stir welding of aluminum alloys Peer-reviewed

H Fujii, L Cui, M Maeda, YS Sato, K Nogi

ADVANCED STRUCTURAL AND FUNCTIONAL MATERIALS DESIGN, PROCEEDINGS　512　389-394　2006

DOI： 10.4028/0-87849-996-2.389 　

ISSN： 0255-5476

Effect of Microstructure on Postweld Formability in Friction Stir Welded Al Alloy 5052 Peer-reviewed

Y. S. Sato, Y. Sugiura, Y. Shoji, S. H. C. Park, H. Kokawa, K. Ikeda

TRENDS IN WELDING RESEARCH, PROCEEDINGS　7　387-391　2006

Development of Intergranular Corrosion Resistant 316 Austenitic Stainless Steel by Grain Boundary Engineering Peer-reviewed

M. Michiuchi, H. Kokawa, Z. J. Wang, Y. S. Sato, K. Sakai

TRENDS IN WELDING RESEARCH, PROCEEDINGS　7　935-938　2006

Ultraprecision Machining Characteristics of Poly-crystalline Germanium Peer-reviewed

J. Yan, Y. Takahashi, J. Tamaki, A. Kubo, T. Kuriyagawa, Y. Sato

Proceedings of the 3rd International Conference on Leading Edge Manufacturing in 21st Century　1035-1040　2005/10/19

Nitrogen desorption by high-nitrogen steel weld metal during CO2 laser welding Peer-reviewed

W Dong, H Kokawa, S Tsukamoto, YS Sato

METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE　36　(5)　677-681　2005/10

DOI： 10.1007/s11663-005-0058-4 　

ISSN： 1073-5615

Microstructural Evolution during Friction Stir Welding of Ultrafine Grained Al Alloys Peer-reviewed

Y.S. Sato, M. Urata, Y. Kurihara, S.H.C. Park, H. Kokawa, K. Ikeda, N. Tsuji

Material Science Forum　503-504　169-174　2005/09

Microstructural characterisation of stir zone containing residual ferrite in friction stir welded 304 austenitic stainless steel Peer-reviewed

SHC Park, YS Sato, H Kokawa, K Okamoto, S Hirano, M Inagaki

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING　10　(5)　550-556　2005/09

DOI： 10.1179/174329305X46691 　

ISSN： 1362-1718

Microstructural Evolution in Austenitic Stainless Steels during Friction Stir Welding Peer-reviewed

Hiroyuki Kokawa, Seung Hwan, C. Park, Yutaka S. Sato, Kazutaka Okamoto, Satoshi Hirano, Masahisa Inagaki

Proceedings of the 8th Inter-University Research Seminar (IURS) on Science and Technology of Welding and Joining, Frontiers of Welding and Joining - Processes　15-16　135-147　2005/08

Microstructure and mechanical properties of friction stir welded SAF 2507 super duplex stainless steel Peer-reviewed

YS Sato, TW Nelson, CJ Sterling, RJ Steel, CO Pettersson

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING　397　(1-2)　376-384　2005/04

DOI： 10.1016/j.msea.2005.02.054 　

ISSN： 0921-5093

Novel production for highly formable Mg alloy plate Peer-reviewed

Y. S. Sato, S. H C Park, A. Matsunaga, A. Honda, H. Kokawa

Journal of Materials Science　40　(3)　637-642　2005/02

DOI： 10.1007/s10853-005-6301-1 　

ISSN： 0022-2461

Microstructures in friction stir welded 304 austenitic stainless steel Peer-reviewed

H. Kokawa, S. H.C. Park, Y. S. Sato, K. Okamoto, S. Hirano, M. Inagaki

Welding in the World　49　(3-4)　34-40　2005

DOI： 10.1007/BF03266473 　

ISSN： 0043-2288

Relationship between bend property and oxide array in the root of a friction stir welded Al alloy Peer-reviewed

Y.S. Sato, H. Takauchi, S.H.C. Park, H. Kokawa

Proceedings of the 11th International Symposium on Plasticity and its Current Application (Plasticity 2005)　CD-ROM　2005/01

Properties and microstructure of friction stir welded inconel alloy 600 Peer-reviewed

YS Sato, P Arkom, SHC Park, H Kokawa, TW Nelson, RJ Steel

PROCEEDINGS OF THE FIFTEENTH (2005) INTERNATIONAL OFFSHORE AND POLAR ENGINEERING CONFERENCE, VOL 4　IV　13-17　2005

ISSN： 1098-6189

Microstructure and mechanical properties of friction stir welded 430 stainless steel Peer-reviewed

SHC Park, T Kumagai, YS Sato, H Kokawa

PROCEEDINGS OF THE FIFTEENTH (2005) INTERNATIONAL OFFSHORE AND POLAR ENGINEERING CONFERENCE, VOL 4　IV　6-12　2005

ISSN： 1098-6189

Grain growth in friction stir welded Al alloy 1100 during postweld heat treatment

Yutaka S. Sato, Hitomi Watanabe, Seung Hwan, C. Park, Hiroyuki Kokawa

Proceedings of the 5th International Friction Stir Welding Symposium　CD-ROM　2004/09

Corrosion resistance of friction stir welded 304 stainless steel Peer-reviewed

SHC Park, YS Sato, H Kokawa, K Okamoto, S Hirano, M Inagaki

SCRIPTA MATERIALIA　51　(2)　101-105　2004/07

DOI： 10.1016/j.scriptamat.2004.04.001 　

ISSN： 1359-6462

Microstructures in friction stir welded 304 austenitic stainless steel Peer-reviewed

Hiroyuki Kokawa, Seung Hwan, C. Park, Yutaka S. Sato, Kazutaka Okamoto, Satoshi Hirano, Masahisa Inagaki

IIW Document IX-2093-04　1-5　2004/07

Friction Stir Welding of Equal Channel Angular Pressed Al Alloys Peer-reviewed

Y.S. Sato, M. Urata, H. Kokawa, K. Ikeda

IIW Document IX-2103-04　1-8　2004/07

Microstructural evolution during dissimilar friction stir welding of Al and Mg alloys

M. Michiuchi, Seung Hwan, C. Park, Yutaka S. Sato, Hiroyuki Kokawa

Proceedings of IIW Pre-Assembly Meeting on FSW in Nagoya 2004　117-125　2004/07

Friction stir welding of an accumulative roll-bonded Al alloy 1100 having ultrafine grains

SATO Yutaka

Proceedings of IIW Pre-Assembly Meeting on FSW in Nagoya 2004　127-134　2004/07

Corrosion properties in friction stir welded 304 austenitic stainless steel

S.H.C. Park, Y.S. Sato, H. Kokawa, K. Okamoto, S. Hirano, M. Inagaki

Proceedings of IIW Pre-Assembly Meeting on FSW in Nagoya 2004　52　(4)　135-142　2004/07

ISSN： 0043-2318

Corrosion resistance of friction stir welded 304 stainless steel

SHC Park, YS Sato, H Kokawa, K Okamoto, S Hirano, M Inagaki

SCRIPTA MATERIALIA　51　(2)　101-105　2004/07

DOI： 10.1016/j.scriptamat.2004.04.001 　

ISSN： 1359-6462

Constitutional liquation during dissimilar friction stir welding of Al and Mg alloys Peer-reviewed

YS Sato, SHC Park, M Michiuchi, H Kokawa

SCRIPTA MATERIALIA　50　(9)　1233-1236　2004/05

DOI： 10.1016/j.scriptamat.2004.02.002 　

ISSN： 1359-6462

Post-weld formability of friction stir welded Al alloy 5052 Peer-reviewed

YS Sato, Y Sugiura, Y Shoji, SHC Park, H Kokawa, K Ikeda

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING　369　(1-2)　138-143　2004/03

DOI： 10.1016/j.msea.2003.11.035 　

ISSN： 0921-5093

FIB-assisted TEM study of an oxide array in the root of a friction stir welded aluminium alloy Peer-reviewed

YS Sato, F Yamashita, Y Sugiura, SHC Park, H Kokawa

SCRIPTA MATERIALIA　50　(3)　365-369　2004/02

DOI： 10.1016/j.scriptamat.2003.10.008 　

ISSN： 1359-6462

Effect of microstructure on corrosion of friction stir welded 304 stainless steel

Seung Hwan, C. Park, Yutaka S. Sato, Hiroyuki Kokawa, Kazutaka Okamoto, Satoshi Hirano

Proceedings of the 5th International Symposium on Friction Stir Welding, Metz, France　5　CDR　2004

Suppression of weld decay of austenitic stainless steel by grain boundary engineering

Hiroyuki Kokawa, Masayuki Shimada, Masato Michiuchi, Wei Zhong Jin, Zhan Jie Wang, Yutaka S. Sato

Proceedings of Finnish-German-Japanese Seminar on Mechanical and Metallurgical Approaches to New Joining Process, Awajishima, Hyogo, Japan　196-203　2004

Interlayer growth at interfaces of Ti/Al-1%Mn, Ti/Al-4.6%Mg and Ti/pure Al friction weld joints by post-weld heat treatment Peer-reviewed

A Fuji, K Ikeuchi, YS Sato, H Kokawa

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING　9　(6)　507-512　2004

DOI： 10.1179/136217104225021797 　

ISSN： 1362-1718

Microstructural evolution of 304 austenitic stainless steel during friction stir welding Peer-reviewed

H Kokawa, SHC Park, YS Sato, K Okamoto, S Hirano, M Inagaki

PROCEEDINGS OF THE FOURTEENTH (2004) INTERNATIONAL OFFSHORE AND POLAR ENGINEERING CONFERENCE, VOL 4　IV　73-77　2004

ISSN： 1098-6189

Friction stir welding of ultrafine grained Al alloy 1100 produced by accumulative roll-bonding Peer-reviewed

YS Sato, Y Kurihara, SHC Park, H Kokawa, N Tsuji

SCRIPTA MATERIALIA　50　(1)　57-60　2004/01

DOI： 10.1016/j.scriptamat.2003.09.037 　

ISSN： 1359-6462

Mechanism governing nitrogen absorption by steel weld metal during laser welding Peer-reviewed

Wei Dong, Hiroyuki Kokawa, Susumu Tsukamoto, Yutaka S. Sato, Makoto Ogawa

Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science　35　(2)　331-338　2004

DOI： 10.1007/s11663-004-0033-5 　

ISSN： 1073-5615

Grain boundary engineering for intergranular corrosion resistant austenitic stainless steel Peer-reviewed

H Kokawa, M Shimada, ZJ Wang, YS Sato, M Michiuchi

ADVANCES IN FRACTURE AND FAILURE PREVENTION, PTS 1 AND 2　261-263　1005-1010　2004

ISSN： 1013-9826

Rapid formation of the sigma phase in 304 stainless steel during friction stir welding Peer-reviewed

SHC Park, YS Sato, H Kokawa, K Okamoto, S Hirano, M Inagaki

SCRIPTA MATERIALIA　49　(12)　1175-1180　2003/12

DOI： 10.1016/j.scriptamat.2003.08.022 　

ISSN： 1359-6462

Microstructural evolution and its effect on Hall-Petch relationship in friction stir welding of thixomolded Mg alloy AZ91D Peer-reviewed

SHC Park, YS Sato, H Kokawa

JOURNAL OF MATERIALS SCIENCE　38　(21)　4379-4383　2003/11

DOI： 10.1023/A:1026351619636 　

ISSN： 0022-2461

Hall-Petch relationship in friction stir welds of equal channel angular-pressed aluminium alloys Peer-reviewed

YS Sato, M Urata, H Kokawa, K Ikeda

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING　354　(1-2)　298-305　2003/08

DOI： 10.1016/S0921-5093(03)00008-X 　

ISSN： 0921-5093

Suppression of chromium depletion by grain boundary structural change during twin-induced grain boundary engineering of 304 stainless steel Peer-reviewed

HY Bi, H Kokawa, ZJ Wang, M Shimada, YS Sato

SCRIPTA MATERIALIA　49　(3)　219-223　2003/08

DOI： 10.1016/S1359-6462(03)00261-6 　

ISSN： 1359-6462

Effect of micro-texture on fracture location in friction stir weld of Mg alloy AZ61 during tensile test Peer-reviewed

SHC Park, YS Sato, H Kokawa

SCRIPTA MATERIALIA　49　(2)　161-166　2003/07

DOI： 10.1016/S1359-6462(03)00210-0 　

ISSN： 1359-6462

Mechanical Properties and Microstructure in Friction Stir Weld of Magnesium Alloy Peer-reviewed

S.H.C. Park, Y.S. Sato, H. Kokawa

溶接法ガイドブック５ 「溶接プロセスの高効率化」　II-386-II-390　2003/06

Texture effects on tensile properties in friction stir weld of a magnesium alloy AZ31 Peer-reviewed

Seung Hwan, C. Park, Yutaka S. Sato, Hiroyuki Kokawa

Proceedings of the 4th International Symposium on Friction Stir Welding, Park City, Utah, USA　CDR　2003/05

DOI： 10.1007/s11661-003-0228-4 　

Metallurgical and mechanical properties of friction stir welded stainless steels Peer-reviewed

Kazutaka Okamoto, Satoshi Hirano, Masahisa Inagaki, Seung Hwan, C. Park, Yutaka S. Sato, Hiroyuki Kokawa, Tracy W. Nelson, Carl D. Sorensen

Proceedings of the 4th International Symposium on Friction Stir Welding, Park City, Utah, USA　(10-11)　CDR-203　2003/05

ISSN： 0005-111X

Hardness distribution and microstructure in friction stir weld of Al alloy 5052 Peer-reviewed

Yutaka S. Sato, Yusuke Sugiura, Hiroyuki Kokawa

Proceedings of the 4th International Symposium on Friction Stir Welding, Park City, Utah　CDR　2003/05

Basal plane texture and flow pattern in friction stir weld of a magnesium alloy Peer-reviewed

SHC Park, YS Sato, H Kokawa

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE　34A　(4)　987-994　2003/04

DOI： 10.1007/s11661-003-0228-4 　

ISSN： 1073-5623

Nitrogen absorption by iron and stainless steels during CO2 laser welding Peer-reviewed

W Dong, H Kokawa, YS Sato, S Tsukamoto

METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE　34　(1)　75-82　2003/02

DOI： 10.1007/s11663-003-0057-2 　

ISSN： 1073-5615

Effect of twin-induced grain boundary engineering on intergranular corrosion in austenitic stainless steel Peer-reviewed

M Shimada, H Kokawa, ZJ Wang, YS Sato

TRENDS IN WELDING RESEARCH, PROCEEDINGS　93-98　2003

Reproduction of ultra-fine grains in equal channel angular pressed Al alloy 5083 by friction stir process Peer-reviewed

YS Sato, M Urata, H Kokawa, K Ikeda

TRENDS IN WELDING RESEARCH, PROCEEDINGS　262-266　2003

Improvement of mechanical properties in thixomolded Mg alloy AZ91D by friction stir welding Peer-reviewed

SHC Park, YS Sato, H Kokawa, T Tsukeda

TRENDS IN WELDING RESEARCH, PROCEEDINGS　267-272　2003

Effect of friction stirring on microstructure in equal channel angular pressed aluminum alloys Peer-reviewed

YS Sato, M Urata, H Kokawa, K Ikeda

THERMEC'2003, PTS 1-5　426-4　2947-2952　2003

ISSN： 0255-5476

Recovery retardation in equal channel angular pressed Al-Zr alloy during friction stir welding Peer-reviewed

YS Sato, M Urata, H Kokawa, K Ikeda

SCRIPTA MATERIALIA　47　(12)　869-873　2002/12

DOI： 10.1016/S1359-6462(02)00385-8 　

ISSN： 1359-6462

Intergranular Corrosion-Resistant Stainless Steel by Twin-Induced Grain Boundary Engineering Peer-reviewed

Hiroyuki Kokawa, Masayuki Shimada, Zhan Jie Wang, Yutaka S. Sato

Annales de Chimie, Science des Materaix　27　(Suppl.1)　S315-S325　2002/12

Dissimilar Friction-Stir Welding of Al Alloy 1050 and Mg Alloy AZ31 Peer-reviewed

Seung Hwan, C. Park, Masato Michiuchi, Yutaka S. Sato, Hiroyuki Kokawa

Proceedings of International Welding/Joining Conference-Korea 2002 on Intelligent Technology in Welding and Joining for the 21st Century, Gyeongju, Korea　534-538　2002/10

Intergranular Corrosion-Resistant Stainless Steel by Grain Boundary Engineering Peer-reviewed

Hiroyuki Kokawa, Masayuki Shimada, Zhan Jie Wang, Yutaka S. Sato

Proceedings of International Welding/Joining Conference-Korea 2002 on Intelligent Technology in Welding and Joining for the 21st Century, Gyeongju, Korea　250-254　2002/10

Effect of Microstructure on Mechanical Properties in Friction Stir Welded Cast A356 Aluminum Alloy Peer-reviewed

Yutaka S. Sato, Mitsunori Urata, Takayasu Kaneko, Hiroyuki Kokawa

Proceedings of International Welding/Joining Conference-Korea 2002 on Intelligent Technology in Welding and Joining for the 21st Century, Gyeongju, Korea　493-498　2002/10

Ductile-brittle transition of steel electron beam weld metal in small punch test Peer-reviewed

Gai, X, YS Sato, H Kokawa, K Ichikawa

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING　7　(4)　204-211　2002/08

DOI： 10.1179/136217102225004275 　

ISSN： 1362-1718

Production of Intergranular Corrosion-Resistant Stainless Steel by Twin-Induced Grain Boundary Engineering Peer-reviewed

Hiroyuki Kokawa, Masayuki Shimada, Zhan Jie Wang, Yutaka S. Sato

Proceedings of the 7th Inter-University Research Seminar on Materials Science, Welding, Joining and Allied Processes, Bratislava, Slovakia, Edited by P. Orszagh, ATP Technika　5-11　2002/06

Optimization of grain boundary character distribution for intergranular corrosion resistant 304 stainless steel by twin-induced grain boundary engineering Peer-reviewed

M. Shimada, H. Kokawa, Z. J. Wang, Y. S. Sato, I. Karibe

Acta Materialia　50　(9)　2331-2341　2002/05/24

DOI： 10.1016/S1359-6454(02)00064-2 　

ISSN： 1359-6454

Parameters controlling microstructure and hardness during friction-stir welding of precipitation-hardenable aluminum alloy 6063 Peer-reviewed

YS Sato, M Urata, H Kokawa

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE　33　(3)　625-635　2002/03

DOI： 10.1007/s11661-002-0124-3 　

ISSN： 1073-5623

Distribution of tensile property and microstructure in friction stir weld of 6063 aluminum Peer-reviewed

YS Sato, H Kokawa

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE　32　(12)　3023-3031　2001/12

DOI： 10.1007/s11661-001-0177-8 　

ISSN： 1073-5623

Microstructural factors governing hardness in friction-stir welds of solid-solution-hardened Al alloys Peer-reviewed

YS Sato, SHC Park, H Kokawa

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE　32　(12)　3033-3042　2001/12

DOI： 10.1007/s11661-001-0178-7 　

ISSN： 1073-5623

Effect of Friction Stir Processing on Microstructure and Hardness Profile of Equal Channel Angular Pressed Aluminum Alloy 1050 Peer-reviewed

Yutaka S. Sato, Mitsunori Urata, Hiroyuki Kokawa, Keisuke Ikeda

Proceedings of the 7th International Welding Symposium on Today and Tomorrow in Science and Technology of Welding and Joining, JWS, Kobe, Japan　1　633-638　2001/11

Mechanical Properties and Microstructure in Friction-Stir-Weld of Magnesium Alloy AZ61 Peer-reviewed

Seung Hwan, C. Park, Yutaka S. Sato, Hiroyuki Kokawa

Proceedings of the 7th International Welding Symposium on Today and Tomorrow in Science and Technology of Welding and Joining, JWS, Kobe, Japan　1　639-644　2001/11

In-situ Observation of Interlayer Growth during Post-weld Heat Treatment in Friction-welded Joint of Titanium and Aluminum Peer-reviewed

Akiyoshi Fuji, Kenji Ikeuchi, Masaaki Kimura, Yutaka S. Sato, Hiroyuki Kokawa

Proceedings of the 7th International Welding Symposium on Today and Tomorrow in Science and Technology of Welding and Joining, JWS, Kobe, Japan　1　663-668　2001/11

Prevention of Weld Decay of Austenitic Stainless Steel by Twin-induced Grain Boundary Engineering Peer-reviewed

Masayuki Shimada, Hiroyuki Kokawa, Zhan Jie Wang, Yutaka S. Sato

Proceedings of the 7th International Welding Symposium on Today and Tomorrow in Science and Technology of Welding and Joining, JWS, Kobe, Japan　2　681-686　2001/11

Mechanism of Nitrogen Absorption of Steel Weld Metal During Laser Welding Peer-reviewed

Wei Dong, Hiroyuki Kokawa, Yutaka S. Sato, Susumu Tsukamoto, Makoto Ogawa

Proceedings of the 7th International Welding Symposium on Today and Tomorrow in Science and Technology of Welding and Joining, JWS, Kobe, Japan　2　845-850　2001/11

Evaluation of Ductile-Brittle Transition Temperature in Electron-Beam Welded Steel by Small Punch Test Peer-reviewed

Xiaohui Gai, Yutaka S. Sato, Hiroyuki Kokawa, Kazutoshi Ichikawa

Proceedings of Asian Pacific Conference on Fracture And Strength '01 & International Conference on Advanced Technology In Experimental Mechanics '01, JSME　2　1030-1035　2001/10

DOI： 10.1299/jsmeatemapcfs.2.01.03.0_1030 　

Arrest of Intergranular Corrosion in Austenitic Stainless Steel by Twin-Induced Grain Boundary Engineering Peer-reviewed

Masayuki Shimada, Hiroyuki Kokawa, Zhang Jie Wang, Yutaka S. Sato

Proceedings of Asian Pacific Conference on Fracture And Strength '01 & International Conference on Advanced Technology In Experimental Mechanics '01, JSME　2　1036-1040　2001/10

DOI： 10.1299/jsmeatemapcfs.2.01.03.0_1036 　

Distributions of hardness and microstructure in friction stir weld of Al alloy 6063 Peer-reviewed

Yutaka S. Sato, Hiroyuki Kokawa, Masatoshi Enomoto, Shigetoshi Jogan, Takenori Hashimoto

Proceedings of the 3rd International Symposium on Friction Stir Welding, Kobe, Japan　3　CDR　2001/09

Retention of fine grained microstructure of equal channel angular pressed aluminum alloy 1050 by friction stir welding Peer-reviewed

YS Sato, M Urata, H Kokawa, K Ikeda, M Enomoto

SCRIPTA MATERIALIA　45　(1)　109-114　2001/07

DOI： 10.1016/S1359-6462(01)01000-4 　

ISSN： 1359-6462

Microtexture in the friction-stir weld of an aluminum alloy Peer-reviewed

YS Sato, H Kokawa, K Ikeda, M Enomoto, S Jogan, T Hashimoto

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE　32　(4)　941-948　2001/04

DOI： 10.1007/s11661-001-0351-z 　

ISSN： 1073-5623

Microstructural characteristics in friction stir welded aluminum alloys

Yutaka S. Sato, Hiroyuki Kokawa

Keikinzoku Yosetsu/Journal of Light Metal Welding and Construction　39　(1)　15-21　2001/01

ISSN： 0368-5306

Properties of as welded and heat treated pure titanium-7075 Al-Zn-Mg alloy friction weld joints Peer-reviewed

A Fuji, K Ameyama, H Kokawa, Y Satoh, TH North

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING　6　(1)　23-30　2001

DOI： 10.1179/136217101101538505 　

ISSN： 1362-1718

Dependence of Carbide Precipitation on Grain Boundary Structure in Sensitized Austenitic Stainless Steel Peer-reviewed

Hiroyuki Kokawa, Takashi Koyanagawa, Masayuki Shimada, Yutaka S. Sato, Takeshi Kuwana

Properties of Complex Inorganic Solids 2, ed. by A. Meike et al., Kluwer Academic/Plenum Publishers, New York　17-26　2000/11

Arrest of Weld Decay of Austenitic Stainless Steel by Grain Boundary Engineering Peer-reviewed

Hiroyuki Kokawa, Masayuki Shimada, Yutaka S. Sato

Proceedings of International Workshop on Fundamental Study and Its Application of Intelligent Nano and Mesoscopic Structured Materials by Field Control, ISRE 2000　91-105　2000/08

Effect of Grain Boundary Structure on Weld Decay of 304 Austenitic Stainless Steel Peer-reviewed

Hiroyuki Kokawa, Masayuki Shimada, Yutaka S. Sato

Proceedings of J. J. Jonas Symposium on Thermomechanical Processing of Steel, edited by S. Yue and E. Essadiqi, COM 2000, CIM　581-593　2000/08

Grain-boundary structure and precipitation in sensitized austenitic stainless steel Peer-reviewed

H Kokawa, M Shimada, YS Sato

JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY　52　(7)　34-37　2000/07

DOI： 10.1007/s11837-000-0159-0 　

ISSN： 1047-4838

Dependence of Carbide Precipitation on Grain Boundary Structure in Sensitized Austenitic Stainless Steel Peer-reviewed

Hiroyuki Kokawa, Takashi Koyanagawa, Masayuki Shimada, Yutaka S. Sato, Takeshi Kuwana

Properties of Complex Inorganic Solids 2　17-26　2000

Effect of nitrogen on shape recovery and tensile properties of Ti-Ni alloy weldments - GTA welding of Ti-Ni shape memory alloy (Report 2) Peer-reviewed

Yoshihiro Sato, Hiroyuki Kokawk, Takeshi Kuwana, Shouichi Sato, Yutaka S. Sato

Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society　18　(2)　318-323　2000

DOI： 10.2207/qjjws.18.318 　

ISSN： 0288-4771

Precipitation sequence in friction stir weld of 6063 aluminum during aging Peer-reviewed

YS Sato, H Kokawa, M Enomoto, S Jogan, T Hashimoto

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE　30　(12)　3125-3130　1999/12

DOI： 10.1007/s11661-999-0223-5 　

ISSN： 1073-5623

Effects of Magnetic Stirring and Grain Structure on Ultrasonic Characteristics in Inconel Overlay-Welds Peer-reviewed

H. Kokawa, Y. S. Sato, A. Ishida, T. Arakawa, K. Hirano

Proceedings of 5th International Conference on Trands in Welding Research, Georgia, USA, Edited by J.M. Vitek, S.A. David, J.A. Johnson, H.B. Smartt, T. DebRoy, ASM International　5　67-71　1999/06

Effect of Nitrogen on Sigma Transformation in Duplex Stainless Steel Weld Metal at High Temperatures Peer-reviewed

Yutaka S. Sato, Hiroyuki Kokawa, Takeshi Kuwana

Proceedings of 5th International Conference on Trands in Welding Research, Georgia, USA, Edited by J.M. Vitek, S.A. David, J.A. Johnson, H.B. Smartt, T. DebRoy, ASM International　5　131-136　1999/06

Preferential precipitation site of sigma phase in duplex stainless steel weld metal Peer-reviewed

Yutaka S. Sato, Hiroyuki Kokawa

Scripta Materialia　40　(6)　659-663　1999/02/19

DOI： 10.1016/S1359-6462(98)00483-7 　

ISSN： 1359-6462

Superplastic deformation mechanisms of monolithic intermetallics Peer-reviewed

WY Kim, Y Sato, S Semboshi, S Hanada, H Kokawa

TOWARDS INNOVATION IN SUPERPLASTICITY II　304-3　147-154　1999

ISSN： 0255-5476

Effect of nitrogen on sigma transformation in duplex stainless steel weld metal Peer-reviewed

YS Sato, H Kokawa, T Kuwana

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING　4　(1)　41-49　1999

DOI： 10.1179/stw.1999.4.1.41 　

ISSN： 1362-1718

Behaviour of Nitrogen in High Strength Stainless Steel JJ1 Weld Metal Peer-reviewed

H. Kokawa, Y. S. Sato, T. Kuwana, Y. Shindo

IIW Document IX-1908-98　51　1-10　1998/09

Effect of nitrogen on corrosion of duplex stainless steel weld metal Peer-reviewed

H Matsunaga, YS Sato, H Kokawa, T Kuwana

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING　3　(5)　225-232　1998

DOI： 10.1179/stw.1998.3.5.225 　

ISSN： 1362-1718