Details of the Researcher

PHOTO

Hiroshi Abe
Section
Graduate School of Engineering
Job title
Associate Professor
Degree

  • 博士（工学）（東北大学）

  • 修士（工学）（東北大学）

Committee Memberships 7

  • 原子力学会 水化学部会 運営小委員会　委員（企画担当）

    2017/04 - Present

  • 原子力学会 水化学部会 運営小委員会　委員（企画担当）

    2017/04 - Present

  • 日本保全学会 東北・北海道支部 広報・会員委員会　委員

    2016/04 - Present

  • 日本保全学会 東北・北海道支部 広報・会員委員会　委員

    2016/04 - Present

  • 腐食防食学会 東北支部　幹事

    2012/04 - 2018/03

  • 腐食防食学会 「材料と環境」編集委員会　委員

    2014/06 - 2016/05

  • 腐食防食学会 「材料と環境」編集委員会　委員

    2014/06 - 2016/05

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Professional Memberships 5

  • 日本鉄鋼協会

  • 日本機械学会

  • 日本保全学会

  • 日本原子力学会

  • 腐食防食学会

Research Areas 2

  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Machine materials and mechanics / 環境強度

  • Energy / Nuclear engineering / 保全工学

Awards 6

  1. 溶接技術奨励賞

    2020　日本溶接学会 東北支部

  2. Paper award

    2019/06

  3. 日本機械学会 動力エネルギーシステム部門 優秀講演表彰

    2013/11

  4. 日本機械学会 動力エネルギーシステム部門 優秀講演表彰

    2009/11

  5. 東北大学総長賞

    2008/03　東北大学

  6. Marcel Pourbaix Award (The Best Poster Paper in Corrosion Science)

    2005/04　NACE

Show all ︎Show 5

Papers 69

  1. Visualisation and quantitative evaluation of chlorides in corroded crevice of stainless steel using radioisotope 36Cl− Peer-reviewed

    So Aoki, Yosuke Abe, Hiroshi Abe, Yutaka Watanabe, Masahiro Yamamoto

    Corrosion Science　2025/10

    DOI： 10.1016/j.corsci.2025.113119 　

  2. Design of an EIS-based sensor for indirect non-invasive corrosion inspection Peer-reviewed

    Zhixin Dong, Benoît Ter-Ovanessian, Hiroshi Abe, Nicolas Mary, Yutaka Watanabe, Bernard Normand

    Corrosion Science　254　113029-113029　2025/09

    Publisher: Elsevier BV

    DOI： 10.1016/j.corsci.2025.113029 　

    ISSN： 0010-938X

  3. Effect of surface finish on SCC susceptibility of 316L stainless steel in high-temperature oxygenated water Peer-reviewed

    Hiroshi Abe, Yutaka Watanabe, Ken Oyama, Tadashi Tatsuki

    Proceedings of 21st International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors　2023

  4. Combined Effects of Chloride Ion and Dissolved Oxygen on SCC Growth of Low-Alloy Steels in High Temperature Water Peer-reviewed

    Tomohiro Takita, Hiroshi Abe, Yutaka Watanabe, Hiromitsu Inagaki

    Proceedings of 21st International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors　2023

  5. Corrosion Monitoring of Carbon Steel in Non-Irradiated, Humidity-Controlled Environments Simulating Gamma-Ray Irradiation Peer-reviewed

    Atsushi Omori, Saya Ajito, Hiroshi Abe, Kuniki Hata, Tomonori Sato, Yoshiyuki Kaji, Hiroyuki Inoue, Mitsumasa Taguchi, Hajime Seito, Eiji Tada, Shunichi Suzuki, Eiji Akiyama

    MATERIALS TRANSACTIONS　63　(4)　555-561　2022/02

    Publisher: Japan Institute of Metals

    DOI： 10.2320/matertrans.mt-c2021006 　

    ISSN： 1345-9678

    eISSN： 1347-5320

  6. EMAR monitoring system applied to the thickness reduction of carbon steel in a corrosive environment Peer-reviewed

    Gildas Diguet, Hina Miyauchi, Sho Takeda, Tetsuya Uchimoto, Nicolas Mary, Toshiyuki Takagi, Hiroshi Abe

    Materials and Corrosion　73　(5)　658-668　2022/01/21

    Publisher: Wiley

    DOI： 10.1002/maco.202112915 　

    ISSN： 0947-5117

    eISSN： 1521-4176

  7. Corrosion Monitoring of Carbon Steel in Non-Irradiated, Humidity-Controlled Environments Simulating Gamma-Ray Irradiation Peer-reviewed

    Atsushi Omori, Saya Ajito, Hiroshi Abe, Kuniki Hata, Tomonori Sato, Yoshiyuki Kaji, Hiroyuki Inoue, Mitsumasa Taguchi, Hajime Seito, Eiji Tada, Shunichi Suzuki, Eiji Akiyama

    Zairyo-to-Kankyo　70　(11)　358-364　2021/11/10

    Publisher: Japan Society of Corrosion Engineering

    DOI： 10.3323/jcorr.70.358 　

    ISSN： 0917-0480

    eISSN： 1881-9664

  8. Influence of Mechanical Surface Treatments on Oxide Properties Formed on 304L Stainless Steel in Simulated BWR and PWR Primary Water Peer-reviewed

    Kathleen Jaffré, Hiroshi Abe, Benoît Ter-Ovanessian, Nicolas Mary, Bernard Normand, Yutaka Watanabe

    Journal of Nuclear Materials　556　(1)　153258-153258　2021/08

    Publisher: Elsevier BV

    DOI： 10.1016/j.jnucmat.2021.153258 　

    ISSN： 0022-3115

  9. Role of the Jet Angle, Particle Size, and Particle Concentration in the Degradation Behavior of Carbon Steel under Slow Slurry Erosion-Corrosion Conditions Peer-reviewed

    Charles Rasse, Nicolas Mary, Hiroshi Abe, Yutaka Watanabe, Bernard Normand

    Metals　11　(8)　1152-1152　2021/07/21

    Publisher: MDPI AG

    DOI： 10.3390/met11081152 　

    eISSN： 2075-4701

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    Erosion-corrosion behavior of piping systems is a critical issue for their durability. This work concerns the erosion-corrosion behavior of carbon steel as a function of abradant characteristics as particle size and concentration. Degradation tests were performed in a jet erosion-corrosion cell with a maximum flow rate of 4.8 m/s, and jet angles comprised 30° and 90°. Abradant particles consisted of angular alumina powder with a mean diameter of 181, 219, and 359 µm. A critical threshold flow velocity of about 2.5 m/s was determined when experiments were performed with particles with diameters of 181 µm and jet angles of 45°. Even if erosion did not occur, the degradation rate increased compared with the stagnant condition because of dissolved dioxygen supply. A maximum of erosion-corrosion of 4 mg × cm−2 × h−1 was determined for the jet angle of 45°, irrespective of the particle sizes. The increase of abradant concentration led to a higher degradation rate regardless of the jet angle. However, the degradation rates tended to limit values of 7 mg × cm−2 × h−1 at 45° and 5 mg × cm−2 × h−1 at 90°. Above a critical concentration, a slowdown of the degradation was measured, suggesting that particle behavior in dense fluid acts on material degradation. This critical concentration can be understood from the interactions of the particles in concentrated media that modify trajectories in the flow and at the metal surface, reducing their kinetic energy consequently.

  10. Effect of Mechanical Surface Treatments on the Surface State and Passive Behavior of 304L Stainless Steel Peer-reviewed

    Kathleen Jaffré, Benoît Ter-Ovanessian, Hiroshi Abe, Nicolas Mary, Bernard Normand, Yutaka Watanabe

    Metals　11　(1)　135-135　2021/01/12

    Publisher: MDPI AG

    DOI： 10.3390/met11010135 　

    eISSN： 2075-4701

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    The effect of dry grinding on 304L stainless steel’s passive behavior is compared to two other surface finishing (mechanical polishing down to 2400 with SiC emery paper and 1 µm with diamond paste, respectively). The characterization of the surface state was performed using scanning electron microscopy, transmission electron microscopy, 3D optical profilometer, and X-ray diffraction. Results indicate that each surface treatment leads to different surface states. The ground specimens present an ultrafine grain layer and a strong plastic deformation underneath the surface, while an ultrafine grain layer characterizes the subsurface of the polished specimens. Grinding induces high residual compressive stresses and high roughness compared to polishing. The characterization of the passive films was performed by electrochemical impedance spectroscopy and Mott–Schottky analysis. The study shows that the semiconductor properties and the thickness of the passive films are dependent on the surface state of the 304L stainless steel.

  11. Corrosion Monitoring in Humidity-Controlled Environment Simulating Gamma Ray Irradiation Peer-reviewed

    Atsushi Omori, Eiji Akiyama, Hiroshi Abe, Kuniki Hata, Tomonori Sato, Yoshiyuki Kaji, Hiroyuki Inoue, Mitsumasa Taguchi, Hajime Seito, Eiji Tada, Shunichi Suzuki

    Zairyo-to-Kankyo　69　(4)　107-111　2020/04/10

    Publisher: Japan Society of Corrosion Engineering

    DOI： 10.3323/jcorr.69.107 　

    ISSN： 0917-0480

    eISSN： 1881-9664

  12. Mechanistic understanding of flow-accelerated corrosion mitigation by trace chromium in carbon steel Peer-reviewed

    Hiroshi Abe, Kazuki Kushida, Yutaka Watanabe

    Proceedings of The NACE International East Asia and Pacific Area Conference　2019/11

  13. Effects of Gamma Ray Irradiation on Corrosion of Carbon Steels at Water Line Peer-reviewed

    Tomomichi Ariga, Hiroshi Abe, Yutaka Watanabe

    Proceedings of 19th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors　2019/08

  14. Characteristics of Work Hardened Surface Layer on Austenitic Stainless Steels and Its Relation to SCC Susceptibility in High Temperature Water Peer-reviewed

    Hiroshi Abe, Yutaka Watanabe, Takamichi Miyazaki

    Proceedings of 19th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors　2019/08

  15. Influence of activated carbon on crevice corrosion in adsorption tower of advanced liquid processing system (ALPS) Peer-reviewed

    Yoshikazu Maeda, Hiroshi Abe, Yutaka Watanabe

    Corrosion Engineering, Science and Technology　53　39-43　2018/07

  16. Oxidation kinetics of austenitic stainless steels as SCWR fuel cladding candidate materials in supercritical water Peer-reviewed

    Hiroshi Abe, Ryuichi Suzuki, Yutaka Watanabe

    Minerals, Metals and Materials Series　9　1181-1194　2018

    Publisher: Springer International Publishing

    DOI： 10.1007/978-3-319-67244-1_75 　

    ISSN： 2367-1696 2367-1181

  17. Effect of molybdate anion addition on repassivation of corroding crevice in austenitic stainless steel Peer-reviewed

    Shun Watanabe, Tomohiro Sekiguchi, Hiroshi Abe, Yutaka Watanabe

    Minerals, Metals and Materials Series　9　1157-1168　2018

    Publisher: Springer International Publishing

    DOI： 10.1007/978-3-319-67244-1_73 　

    ISSN： 2367-1696 2367-1181

  18. Characterization of the Corroded Surface Morphology of a Carbon Steel Piping Elbow Affected by Flow-Accelerated Corrosion Peer-reviewed

    Hiroshi ABE, Yutaka WATANABE, Makoto NAKASHIMA, Tadashi TATSUKI

    E-Journal of Advanced Maintenance　Vo.9　(No.1)　26-32　2017/06

  19. Effect of Scaly Structure on the Measurement of Pipe Wall Thickness using EMAT Peer-reviewed

    Hongjun SUN, Ryoichi URAYAMA, Tetsuya UCHIMOTO, Fumio KOJIMA, Toshiyuki TAKAGI, Hiroshi ABE, Kunihiro KOBAYASHI

    E-Journal of Advanced Maintenance　Vo.9　(No.1)　15-25　2017/05

  20. Characteristics of scalloped surface and its relation to FAC rate of carbon steel piping elbow Peer-reviewed

    阿部 博志, 矢野 拓磨, 渡邉 豊, 中嶋 誠, 田附 匡

    日本機械学会論文集　Vol.83　(No.847)　2017/03/25

    DOI： 10.1299/transjsme.16-00453 　

  21. Critical Potentials for Re-Passivation of Corroding Crevice in Corrosion Resistant Alloys

    Yutaka Watanabe, Hiroshi Abe, Tomohiro Sekiguchi

    Proceedings of 20th NPC International Conference　Paper No.58　2016/10

  22. Influence of Activated Carbon on Crevice Corrosion in Adsorrtion Tower of Advanced Liquid Processing System(ALPS)

    Yoshikazu Maeda, Hiroshi Abe, Yutaka Watanabe

    Proceedings of 17th Asian Pacific Corrosion Control Conference　2016/01

  23. Determining the repassivation potential for crevice corrosion of 316L stainless steels and alloy 600 in chloride-containing environment Peer-reviewed

    Hiroki Iwakane, Tomohiro Sekiguchi, Hiroshi Abe, Yutaka Watanabe

    Proceedings of 17th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors　2015/09

  24. Characterization of oxide film formed in flow accelerated corrosion of carbon steels and its relationship to thining rate Peer-reviewed

    Hiroshi Abe, Takuma Yano, Takamichi Miyazaki, Yutaka Watanabe, Kazutoshi Fujiwara, Kimitoshi Yoneda, Fumio Inada

    Proceedings of 17th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors　2015/09/01

  25. Effect of Chromium Content on the Oxidation Behavior of Ni-Cr Model Alloys in Superheated Steam Peer-reviewed

    Fethi Hamdani, Hiroshi Abe, Benoit Ter-Ovanessian, Bernard Normand, Yutaka Watanabe

    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE　46A　(5)　2285-2293　2015/05

    DOI： 10.1007/s11661-015-2786-7 　

    ISSN： 1073-5623

    eISSN： 1543-1940

  26. Effects of phosphorus segregation on stress corrosion cracking in the heat-affected zone of a dissimilar weld joint between a Ni-base alloy and a low alloy steel Peer-reviewed

    Ziqing Zhai, Hiroshi Abe, Yuichi Miyahara, Yutaka Watanabe

    CORROSION SCIENCE　92　(March 2015)　32-42　2015/03

    DOI： 10.1016/j.corsci.2014.10.037 　

    ISSN： 0010-938X

    eISSN： 1879-0496

  27. Effects of Thermal History and Microstructure on Segregation of Phosphorus and Alloying Elements in the Heat-Affected Zone of a Low Alloy Steel Peer-reviewed

    Ziqing Zhai, Yuichi Miyahara, Hiroshi Abe, Yutaka Watanabe

    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE　45A　(13)　6163-6172　2014/12

    DOI： 10.1007/s11661-014-2582-9 　

    ISSN： 1073-5623

    eISSN： 1543-1940

  28. Oxidation behavior of austenitic stainless steels as fuel cladding candidate materials for SCWR in superheated steam Peer-reviewed

    Hiroshi Abe, Seung Mo Hong, Yutaka Watanabe

    NUCLEAR ENGINEERING AND DESIGN　280　652-660　2014/12

    DOI： 10.1016/j.nucengdes.2014.08.020 　

    ISSN： 0029-5493

  29. Evaluation of crevice forming materials for creviced stress corrosion cracking tests in oxygenated high-temperature water Peer-reviewed

    Hiroshi Abe, Junichi Ishikura, Yutaka Watanabe

    Proceedings of 19th International Corrosion Congress　2014/11

  30. CHARACTERIZATION OF THE OXIDE FILM FORMED IN THE FLOWACCELERATED CORROSION OF CARBON STEELS

    Takuma Yano, Hiroshi Abe, Takamichi Miyazaki, Yutaka Watanabe, Kazutoshi Fujiwara, Fumio Inada

    Proceedings of 19th NPC International Conference　Paper No. 10266　2014/10/02

  31. Effect of non-halide anions on repassivation of crevice corrosion on the austenitic stainless steel

    Tomohiro Sekiguchi, Yutaka Watanabe, Hiroshi Abe

    Proceedings of 19th NPC International Conference　Paper No. 10267　2014/10/01

  32. Segregation behavior of phosphorus in the heat-affected zone of an A533B/A182 dissimilar weld joint before and after simulated thermal aging Peer-reviewed

    Ziqing Zhai, Yuichi Miyahara, Hiroshi Abe, Yutaka Watanabe

    JOURNAL OF NUCLEAR MATERIALS　452　(1-3)　133-140　2014/09

    DOI： 10.1016/j.jnucmat.2014.05.005 　

    ISSN： 0022-3115

    eISSN： 1873-4820

  33. Oxidation Behavior of Cladding Tube-Shaped 15Cr-20Ni Austenitic Stainless Steels in Supercritical Water at 700°C

    Ryuichi Suzuki, Hiroshi Abe, Yutaka Watanabe

    Proceedings of International Symposium On High-Temperature Oxidation And Corrosion 2014 (ISHOC2014)　337-340　2014/06

  34. Materials Peer-reviewed

    Yutaka Watanabe, Hiroshi Abe, Yoshiaki Oka

    Supercritical-Pressure Light Water Cooled Reactors　9784431550259　321-345　2014/05/01

    Publisher: Springer Japan

    DOI： 10.1007/978-4-431-55025-9_4 　

  35. MECHANISTIC STUDY OF FAC PROCESSES FOCUSED ON THE OXIDE LAYER PROPERTIES Peer-reviewed

    Hiroshi Abe, Yutaka Watanabe

    PROCEEDINGS OF THE ASME PRESSURE VESSELS AND PIPING CONFERENCE - 2013, VOL 6B: MATERIALS AND FABRICATION　No. 98066　2014

    DOI： 10.1115/PVP2013-98066 　

  36. Mechanistic Aspects of Flow-Accelerated Corrosion Suppression by Trace Chromium in Carbon Steels

    Hiroshi Abe, Yutaka Watanabe

    Proceedings of the 10 International Conference on Flow Dynamics　2013/11

  37. Effects of Microstructure on Stress Corrosion Cracking in Heat Affected Zone of Alloy 182-A533B Dissimilar Weld Joint Under BWR Conditions Peer-reviewed

    Ziqing Zhai, Hiroshi Abe, Yutaka Watanabe

    Proceedings of 16th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors　2013/08/14

  38. Oxidation Behavior of Austenitic Stainless Steels in Supercritical Water Peer-reviewed

    Hiroshi Abe, Ryuichi Suzuki, Hong Seung Mo, Yutaka Watanabe

    Proceedings of 16th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors　2013/08/13

  39. Progress of Super Fast Reactor Phase 2 Project and Studies of Waseda University Peer-reviewed

    Y. Oka, S. Morooka, M. Yamakawa, Y. Ishiwatari, Y. Katsumura, Hideo Mori, Yoshinori Hamamoto, T. Kugo, K. Takase, K. Ezato, T. Misawa, Y. Watanabe, H. Abe, K. Sue

    Proceedings of the 6th International Symposium on Supercritical-Water-Cooled Reactors　ISSCWR6-13035　2013/03

  40. High-temperature steam oxidation kinetics and mechanism of SCWR fuel cladding candidate materials Peer-reviewed

    Hiroshi Abe, Seung Mo Hong, Yutaka Watanabe

    International Conference on Nuclear Engineering, Proceedings, ICONE　1　No. 16432　2013

    Publisher: American Society of Mechanical Engineers (ASME)

    DOI： 10.1115/ICONE21-16432 　

  41. Role of delta-ferrite in stress corrosion cracking retardation near fusion boundary of 316NG welds Peer-reviewed

    Hiroshi Abe, Yutaka Watanabe

    JOURNAL OF NUCLEAR MATERIALS　424　(1-3)　57-61　2012/05

    DOI： 10.1016/j.jnucmat.2012.02.006 　

    ISSN： 0022-3115

  42. Iodine-Induced Stress Corrosion Cracking of Zircaloy-4: Identification of Critical Parameters Involved in Intergranular to Transgranular Crack Propagation Peer-reviewed

    Virginie Francon, Marion Fregonese, Hiroshi Abe, Yutaka Watanabe

    ENVIRONMENTAL DEGRADATION OF ENGINEERING & MATERIALS ENGINEERING AND TECHNOLOGIES　183　49-+　2012

    DOI： 10.4028/www.scientific.net/SSP.183.49 　

    ISSN： 1012-0394

  43. Mechanistic Study of Combined Effect of Cr Content and Water Chemistry on FAC Rate of Carbon Steels Peer-reviewed

    Hiroshi Abe, Yutaka Watanabe

    Proceedings of the 8th International Conference on Flow Dynamics　416-417　2011/11

  44. Effects of solidification mode and low-temperature aging on SCC behavior Peer-reviewed

    Hiroshi Abe, Yutaka Watanabe, Takamichi Miyazaki

    Proceedings of 19th International Conference on Nuclear Engineering　ICONE19-43554　2011/08/10

  45. Evaluation of Stress Corrosion Cracking Susceptibility for Austenitic Alloys in Salt Production Environments Peer-reviewed

    津川貴臣, 渡辺 豊, 阿部博志

    日本海水学会誌　65　(2)　88-96　2011/04

    Publisher: The Society of Sea Water Science, Japan

    DOI： 10.11457/swsj.65.88 　

    ISSN： 0369-4550

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    Constant strain SCC tests have been performed on five kinds of austenitic alloys, SUS316L, YUS270, NAS254N, NAS354N, and C-22, in simulated salt production environments. From the results of the SCC tests, susceptible conditions to SCC for each alloy. were clarified SUS316L and YUS270 were susceptible to SCC, but NAS254N, NAS354N, and C-22 were not susceptible in the salt production environments. Cold rolling increased SCC susceptibility for SUS316L and YUS270. And there was no potent influence on SCC resistance by a change in atmosphere, judging from the SCC test results under conditions of bubbling O2 and N2 gas only in bittern.<br>The material selection guideline for salt production plants has been determined based on both the test results and reported SCC experiences in actual plants. The material selection guideline for the salt production environmentsis as follows;<br>· It is possible to apply SUS316L to the condensation process.<br>· It is reasonable to apply super stainless steel of over 40 in PRE to low density crystallization process.<br>· If it is necessary to avoid all local corrosion in high density crystallization processes and later, super stainless steel of over 50 in PRE or Ni-base alloys should be applied.<br>(Pitting Resistance Equivalent: PRE = Cr + 3.3Mo + 20N)

  46. DEVELOPMENT OF μ-PIXE/RBS/SEM SYSTEM FOR CORROSION LAYER ANALYSIS OF STEEL Peer-reviewed

    S. MATSUYAMA, K. ISHII, M. FUJIWARA, Y. KIKUCHI, H. SUGAI, K. FUJIKI, Y. HATORI, N. HAMADA, Y. ITO, S. HIRAISHI, Y. MIURA, A. FUKAYA, S. TANNO, H. ABE, Y. WATANABE, H. YAMAZAKI

    International journal of PIXE　vol.21　(Nos.3&4)　87-93　2011

  47. STRESS CORROSION CRACKING BEHAVIOR NEAR THE FUSION BOUNDARY OF DISSIMILAR WELD JOINT WITH ALLOY 182-A533B LOW ALLOY STEEL Peer-reviewed

    Hiroshi Abe, Makoto Ishizawa, Yutaka Watanabe

    15TH INTERNATIONAL CONFERENCE ON ENVIRONMENTAL DEGRADATION OF MATERIALS IN NUCLEAR POWER SYSTEMS-WATER REACTORS　791-802　2011

  48. Understanding Key Parameters in Flow Accelerated Corrosion forAdvancedWall Thinning Prediction Peer-reviewed

    Hiroshi Abe, Shinji Ebara, Nobuyuki Fujisawa, Hidetoshi Hashizume, Kiwamu Sue, Yutaka Watanabe, Takayuki Yamagata

    Proceedings of International Symposium on the Ageing Management & Maintenance of Nuclear Power Plants　2010/12

  49. Oxidation Behavior and Cracking Susceptibility of Ni-Cr Alloys in Dry Steam and Inert Gas under Extremely-Low Oxygen Partial Pressure Peer-reviewed

    Hiroshi ABE, Yasuhiro KENMOKU, Takayuki ENDO, Takamichi MIYAZAKI, Yutaka WATANABE

    Journal of Solid Mechanics and Materials Engineering　Vol.4　(No.7)　891-897　2010/07

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/jmmp.4.891 　

    ISSN： 1880-9871

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    In order to investigate oxidation behavior and cracking susceptibility of the Ni-Cr alloys under extremely-low oxygen partial pressure, three Ni-Cr alloys (Ni-14Cr, Ni-22Cr and Ni-30Cr) were used as plate specimen and reverse U-bend specimen for oxidation experiments for 750 hours at 400 °C in two kinds of gas system (inert gas and dry steam) under various oxygen potential (Ni stable, Ni/NiO equilibrium and NiO stable). The Ni-Cr alloys cracked along grain boundary both in inert gas system (with trace O2, without H2O) and in hydrogenated steam. In the inert gas system, the cracking susceptibility was confirmed in near NiO stable condition. On the other hand, no crack was found in near Ni stable condition. In the dry steam system, the cracking susceptibility was confirmed in near Ni/NiO equilibrium. In contrast, no crack was found in near NiO stable condition. The cracking susceptibility was confirmed in near Ni/NiO equilibrium in hydrogenated steam as contrasted with higher oxygen potential in inert gas system. This result shows that potential range for the cracking susceptibility seemed to be different between the two kinds of gas system. Cracking severity was highest for Ni-14Cr and lowest for Ni-30Cr both in inert gas and steam; however, even Ni-30Cr was not immune to intergranular cracking in steam near Ni/NiO equilibrium.

  50. EFFECTS OF Cr CONTENT AND ENVIRONMENTAL FACTORS ON FAC RATE OF CARBON STEELS Peer-reviewed

    Yutaka Watanabe, Kiwamu Sue, Hiroshi Abe

    PROCEEDINGS OF THE ASME PRESSURE VESSELS AND PIPING CONFERENCE, VOL 6, PTS A AND B　933-936　2010

  51. Study of FAC rate of carbon steels based on characterization of oxide film Peer-reviewed

    Yutaka Watanabe, Hiroshi Abe

    Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B　76　(763)　433-435　2010

    Publisher: Japan Society of Mechanical Engineers

    DOI： 10.1299/kikaib.76.763_433 　

    ISSN： 0387-5016

  52. EFFECT OF MATERIAL FACTORS ON FAC RATE AND CHARACTERISTICS OF OXIDE LAYER Peer-reviewed

    Yutaka Watanabe, Hiroshi Abe, Takamichi Miyazaki

    PROCEEDINGS OF THE ASME PRESSURE VESSELS AND PIPING CONFERENCE 2010, VOL 6, PTS A AND B　PVP2010-25584　1253-1256　2010

    DOI： 10.1115/PVP2010-25584 　

  53. 高Ni 合金の高温水中SCC 機構解明と耐SCC 成分設計に関する基礎的研究(1)事業概要

    渡辺豊, 竹田陽一, 阿部博志, 佐藤崇之, 宮崎孝道, 庄子哲雄

    日本原子力学会「2009 年秋の大会」　2009/09

  54. 高Ni 合金の高温水中SCC 機構解明と耐SCC 成分設計に関する基礎的研究(2)高温水中SCC 感受性評価

    佐藤崇之, 竹田陽一, 渡辺豊, 阿部博志, 宮崎孝道, 庄子哲雄

    日本原子力学会「2009 年秋の大会」　2009/09

  55. 高Ni 合金の高温水中SCC 機構解明と耐SCC 成分設計に関する基礎的研究(3)気相中における応力下酸化挙動評価

    阿部博志, 渡辺豊, 竹田陽一, 佐藤崇之, 宮崎孝道, 庄子哲雄

    日本原子力学会「2009 年秋の大会」　2009/09

  56. CHARACTERIZATION OF CORROSION LAYER OF CARBON STEEL BY MICRO-PIXE/RBS ANALYSIS Peer-reviewed

    S. Matsuyama, K. Ishii, H. Yamazaki, M. Fujiwara, Y. Kikuchi, M. Nakhostin, Y. Kawamura, S. Tsuboi, K. Yamanaka M, Watanabe, S. Ohkura, Y. Hashimoto, M. Fujikawa, G. Catella, K. Fujiki, Y. Hatori, N. Hamada, S. Tanino, H. Abe, Y. Watanabe

    International Journal of PIXE,19,(2009),61-66　2009　99-103　2009

    Publisher: Cyclotron and Radioisotope Center, Tohoku University

  57. Metallurgical Study on Low-temperature Aging Characteristics and SCC Behavior of Type 316L Welds Peer-reviewed

    Hiroshi Abe, Yutaka Watanabe

    Proceedings of 17th International Corrosion Congress　2008/09

  58. Low-temperature aging characteristics of type 316L stainless steel welds: Dependence on solidification mode Peer-reviewed

    Hiroshi Abe, Yutaka Watanabe

    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE　39A　(6)　1392-1398　2008/06

    DOI： 10.1007/s11661-008-9511-8 　

    ISSN： 1073-5623

  59. Low-Temperature Aging of Delta-Ferrite in 316L SS Welds; Changes in Mechanical Properties and Etching Properties Peer-reviewed

    Hiroshi Abe, Keita Shimizu, Yutaka Watanabe

    Journal of Power and Energy Systems　2　(1)　2-7　2008

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/jpes.2.2 　

    ISSN： 1881-3062

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    Thermal aging embrittlement of LWR components made of stainless cast (e.g. CF-8 and CF-8M) is a potential degradation issue, and careful attention has been paid on it. Although welds of austenitic stainless steels (SSs) have γ-δ duplex microstructure, which is similar to that of the stainless cast, examination on thermal aging characteristics of the SS welds is very limited. In order to evaluate thermal aging behavior of weld metal of austenitic stainless steel, the 316L SS weld metal has been prepared and changes in mechanical properties and in etching properties at isothermal aging at 335°C have been investigated. The hardness of the ferrite phase has increased with aging, while the hardness of austenite phase has stayed same. It has been suggested that spinodal decomposition has occurred in δ-ferrite by the 335°C aging. The etching rates of δ-ferrite at immersion test in 5wt% hydrochloric acid solution have been also investigated using an AFM technique. The etching rate of ferrite phase has decreased consistently with the increase in hardness of ferrite phase. It has been thought that this characteristic is also caused by spinodal decomposition of ferrite into chromium-rich (α') and iron-rich (α).

  60. Low-Temperature Aging Characteristics and SCC Behaviors of Type 316L Welds Peer-reviewed

    Hiroshi Abe, Yutaka Watanabe

    Proceedings of 13th International Conference on Environmental Degradation of Materials in Nuclear Power Systems,(CD-ROM),1-12　2007

  61. Low-temperature aging of delta-ferrite in 316L SS welds; changes in mechanical properties and etching properties Peer-reviewed

    Hiroshi Abe, Keita Shimizu, Yutaka Watanabe

    Proceedings of The 15th International Conference on Nuclear Engineering,CD-ROM　2　(1)　2-7　2007

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/jpes.2.2 　

    ISSN： 1881-3062

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    Thermal aging embrittlement of LWR components made of stainless cast (e.g. CF-8 and CF-8M) is a potential degradation issue, and careful attention has been paid on it. Although welds of austenitic stainless steels (SSs) have γ-δ duplex microstructure, which is similar to that of the stainless cast, examination on thermal aging characteristics of the SS welds is very limited. In order to evaluate thermal aging behavior of weld metal of austenitic stainless steel, the 316L SS weld metal has been prepared and changes in mechanical properties and in etching properties at isothermal aging at 335°C have been investigated. The hardness of the ferrite phase has increased with aging, while the hardness of austenite phase has stayed same. It has been suggested that spinodal decomposition has occurred in δ-ferrite by the 335°C aging. The etching rates of δ-ferrite at immersion test in 5wt% hydrochloric acid solution have been also investigated using an AFM technique. The etching rate of ferrite phase has decreased consistently with the increase in hardness of ferrite phase. It has been thought that this characteristic is also caused by spinodal decomposition of ferrite into chromium-rich (α') and iron-rich (α).

  62. Effect of physical property of water on SCC growth rate of 316L stainless steels in high-temperature water Peer-reviewed

    Hiroshi Abe, Yutaka Watanabe

    PROGRESSES IN FRACTURE AND STRENGTH OF MATERIALS AND STRUCTURES, 1-4　353-358　270-274　2007

    ISSN： 1013-9826

  63. P58 Effect of solidification mode on susceptibility of aging and corrosion behavior of 316L SS welds in high-temperature water

    ABE Hiroshi, SHIMIZU Keita, WATANABE Yutaka

    Proceedings of the 1992 Annual Meeting of JSME/MMD　2006　635-636　2006

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/jsmezairiki.2006.0_635 　

  64. 429 Importance of Physical Properties of Water in Stress Corrosion Cracking in High-Temperature Water and its Implication to the Cracking Mechanisms

    WATANABE Yutaka, ABE Hiroshi

    Proceedings of the 1992 Annual Meeting of JSME/MMD　2005　313-314　2005

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/jsmezairiki.2005.0_313 　

  65. Effect of physical property and chemistry of water on cracking of stainless steels in sub-critical and supercritical water Peer-reviewed

    Y Watanabe, H Abe, Y Daigo, R Fujisawa, M Sakaihara

    ADVANCES IN FRACTURE AND FAILURE PREVENTION, PTS 1 AND 2　261-263　1031-1036　2004

    ISSN： 1013-9826

  66. Stress Corrosion Cracking Mechanisms of 316 Stainless Steels in Sub-Critical Liquid Water and Supercritical Water from a “Dielectric Constant of Water” Point of View Peer-reviewed

    Hiroshi Abe, Yutaka Watanabe, Kiwamu Sue

    Proceedings of 2004 International Congress on Advances in Nuclear Power Plants,Paper No.4226,1-8　2004

  67. Corrosion Resistance and Cracking Susceptibility of 316L Stainless Steel in Sulfuric Acid-Containng Supercritical Water Peer-reviewed

    Yutaka Watanabe, Hiroshi Abe, Yuzo Daigo, Takashi Nishida

    CORROSION2004,Paper No.493,1-7　2004

  68. Cracking of Stainless Steels in Supercritical Water : A Mechanistic Insight

    ABE Hiroshi, DAIGO Yuzo, WATANABE Yutaka, NISHIDA Takashi

    Proceedings of the 1992 Annual Meeting of JSME/MMD　2003　745-746　2003

    Publisher: The Japan Society of Mechanical Engineers

    DOI： 10.1299/jsmezairiki.2003.0_745 　

  69. Environmentally Assisted Cracking of Sensitized Stainless Steel in Supercritical Water: Effects of Physical Property of Water Peer-reviewed

    Yutaka Watanabe, Hiroshi Abe, Yuzo Daigo, Takashi Nishida

    Proceedings of International Conference on Global Environment and Advanced Nuclear Power Plants,Paper No.1183　2003

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Misc. 18

  1. Stress Corrosion Cracking of Stainless Steel Weldments in Nuclear Power Plants Peer-reviewed

    Hiroshi Abe

    63　(11)　2024/11

  2. Database for corrosion under irradiation conditions (Contract research) Peer-reviewed

    Sato, Tomonori, Hata, Kuniki, Kaji, Yoshiyuki, Ueno, Fumiyoshi, Inoue, Hiroyuki, Taguchi, Mitsumasa, Seito, Hajime, Tada, Eiji, Abe, Hiroshi, Akiyama, Eiji, Suzuki, Shunichi

    JAEA-Review　2021-001　2021/06

    DOI： 10.11484/jaea-review-2021-001 　

  3. OS0915-416 Wastage mechanism of heating tubes made of austenitic stainless steels in a melamine production plant

    YAMAMOTO Kohei, ABE Hiroshi, WATANABE Yutaka, ONO Masashi, ARIOKA Shinpei

    2015　"OS0915-416-1"-"OS0915-416-3"　2015/11/21

    Publisher: The Japan Society of Mechanical Engineers

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    It was reported by the authors that a nitrided layer formed on SUS310S heating tubes in the reactor of melamine production plant showed a severe spalling susceptibility. After replacement to SUS304 heating tubes, spalling and thinning was suppressed. According to the previous studies, phases of the nitrided layers of the SUS310S and SUS304 heating tubes consist mainly of γ' and α', respectively. The reason why the SUS310S heating tube showed the high spalling susceptibility was considered to be a higher expansion rate of γ' compared with α'. The purpose of this study is to investigate the relation between the spalling susceptibility and nitrided layer characteristics (crystal structure, nitrogen concentration). EDX analysis showed a higher nitrogen concentration of SUS310S than that of SUS304. This results are consistent with the solid solubility of nitrogen shown in the phase diagram of Fe-N systems. XRD analysis indicated that the nitrided layer of SUS310S consists of both γ' and α'. The nitrogen concentration and expansion rate of γ' estimated by XRD analysis was higher than that of α'. Those results infer that the high expansion rate of γ' causes severe spalling susceptibility of the SUS310S heating tubes.

  4. B124 Oxidation rate of candidate materials for fuel cladding of supercritical water-cooled reactor

    Suzuki Ryuichi, Abe Hiroshi, Watanabe Yutaka

    National Symposium on Power and Energy Systems　2015　(20)　43-46　2015/06/07

    Publisher: The Japan Society of Mechanical Engineers

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    Supercritical water-cooled reactor (SCWR) is one of the advanced reactor concepts for generation IV nuclear reactors. Material of fuel cladding for SCWR is required long term integrity and durability at metal temperature of 700℃. Then, 15Cr-20Ni austenitic stainless steel (1520S) which has sufficient creep strength at 700℃ was proposed for the candidate materials for fuel cladding of SCWR. In this study, oxidation behavior of 1520S as candidate materials, SUS316L and SUSS 1 OS as comparison materials in supercritical water at 700℃ and 650℃ under 24MPa for 1500h were discussed in terms of: temperature, cold work (CW) and surface finish. The main objective of this work is to predict the oxide behavior of candidate materials after 50,000h which is the estimated maximum operating time of fuel cladding.

  5. A233 Relationship between thinning rate of carbon steels due to flow-accelerated corrosion and characteristics of oxide films formed

    YANO Takuma, ABE Hiroshi, Miyazaki TAKAMICHI, WATANABE Yutaka, FUJIWARA Kazutoshi, YONEDA Kimitoshi

    National Symposium on Power and Energy Systems　2015　(20)　205-208　2015/06/07

    Publisher: The Japan Society of Mechanical Engineers

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    Major mechanism of the pipe wall thinning taking place in the nuclear power plant is flow-accelerated corrosion (FAC). Mechanism of FAC is not yet fully understood, especially, role of oxide film in determining thinning rate. The main objective of this work is finding characteristics of oxide film and examining a relationship between film characteristics and thinning rate. Furthermore, role of film characteristics on FAC model was discussed. Transmission Electron Microscope (TEM) observation using Fresnel contrast was used to investigate the microscopic defect structure of the oxide film. As a result of observation, the oxide layer formed on the specimens was consisted of porous and compact oxides in nanometer-scale and the thinning rate increased with decreasing compact oxide thickness. However, it have been suggested that compact oxide thickness doesn't affect thinning rate and rate determining step is diffusion of ferrous ion in diffusion layer.

  6. OS1407 Microstructure and ageing properties of stainless steel weld

    ABE Hiroshi, TERAO Toshihiko, WATANABE Yutaka

    2013　"OS1407-1"-"OS1407-3"　2013/10/12

    Publisher: The Japan Society of Mechanical Engineers

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    To evaluate the rate of thermal embrittlement of type 316 low-carbon stainless steel weld metal at BWR operating temperature, aging test at 310℃, 335℃, and400℃ was carried out. Hardness of each ferrite and austenite phase of specimens was measured selectively by microhardness tester. Hardness of ferrite was increased apparently with all three aging temperatures, whereas hardness of austenite was not changed. Changes in the microstructure of ferrite aged at 310℃ for 11,000h and 18,000h were analyzed by TEM. It has been revealed that hardening of ferrite with aging at 310℃ was result of spinodal decomposition. Arrhenius plot for hardening rate of ferrite at each three aging temperature was plotted, and apparent activation energy was estimated. Using the apparent activation energy, hardening rate at 288℃ was discussed.

  7. D113 A study of FAC mechanism based on detailed observation of oxide film

    ABE Hiroshi, WATANABE Yutaka

    National Symposium on Power and Energy Systems　2013　(18)　109-110　2013/06/19

    Publisher: The Japan Society of Mechanical Engineers

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    Effects of Cr content on flow accelerated corrosion (FAC) of carbon steels have been evaluated and their relation to oxide scale characteristics based on detailed oxide layer characterizations using transmission electron microscope with X-ray analyzer have been discussed There is no "threshold" concentration of chromium below which there is no effect of Cr content on the corrosion rate Time dependency to chromium effect has also been not observed Thickness of oxide layer does not affect the FAC rate in this experiments

  8. D113 Evaluation of aging embrittlement of low-carbon austenitic stainless steel weld metal near the BWR operating temperature

    TERAO Toshihiko, ABE Hiroshi, WATANABE Yutaka

    National Symposium on Power and Energy Systems　2012　(17)　121-124　2012/06/20

    Publisher: The Japan Society of Mechanical Engineers

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    Austenitic stainless steel weld metal used in boiling water reactor (BWR) is mainly austenitic, but contains up to around 15 % of ferrite. Abe et al. examined aging properties of type 316 low-carbon stainless steel weld metal at 335℃ and suggested that thermal hardening due to spinodal decomposition potentially occur even at lower temperature such as BWR operating temperature (288 ℃). To evaluate the rate of thermal embrittlement of type 316 low-carbon stainless steel weld metal at BWR operating temperature, aging test at 310℃, 335℃, and 400℃ was carried out. It is revealed that hardening with aging at 310℃ was result of spinodal decomposition. Comparing thermal hardening behavior, hardening rate at 288℃ was discussed.

  9. Combined effect of material and environment factors on flow accelerated corrosion and oxide film property of carbon steel pipes

    阿部博志, 渡辺豊

    Journal of The Surface Finishing Society of Japan　63　(5)　290-295　2012/05/01

    Publisher: The Surface Finishing Society of Japan

    DOI： 10.4139/sfj.63.290 　

  10. 高Ni合金の環境助長割れ感受性条件の検討(3)高温気相環境での割れ条件と皮膜特性

    阿部博志, 渡辺豊, 竹田陽一, 佐藤崇之, 山内大輔, 宮崎孝道, 庄子哲雄

    日本原子力学会秋の大会予稿集(CD-ROM)　2011　ROMBUNNO.E49　2011/09/02

  11. 高Ni合金の環境助長割れ感受性条件の検討(2)高温水環境での応力下酸化挙動と割れ感受性評価

    竹田陽一, 山内大輔, 渡辺豊, 阿部博志, 佐藤崇之, 宮崎孝道, 庄子哲雄

    日本原子力学会秋の大会予稿集(CD-ROM)　2011　ROMBUNNO.E48　2011/09/02

  12. 高Ni合金の環境助長割れ感受性条件の検討(1)研究内容と成果の概要

    渡辺豊, 竹田陽一, 阿部博志, 佐藤崇之, 山内大輔, 宮崎孝道, 庄子哲雄

    日本原子力学会秋の大会予稿集(CD-ROM)　2011　ROMBUNNO.E47　2011/09/02

  13. OS2507 Microstructural characteristics and SCC susceptibility near the fusion boundary of dissimilar weld joint with Ni-base weld metal and low alloy steel

    ABE Hiroshi, WATANABE Yutaka

    2011　"OS2507-1"-"OS2507-2"　2011/07/16

    Publisher: The Japan Society of Mechanical Engineers

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    Stress corrosion cracking (SCC) behavior near the fusion boundary of dissimilar weld joint with Alloy 182-A533B low alloy steel (LAS) in high temperature water have been investigated focused on the relationship between the crack pass and characteristics of microstructure. It has been observed that spherical and crack-like oxides were formed in LAS. From the results of metallographic observation of the SCC specimens, cracks in Alloy 182 propagated along the dendrite grain boundary, and crack-like oxides in LAS propagated along the prior austenite grain boundary in coarse-grained heat-affected zone. It has been suggested that the continuousness between dendrite and prior austenite grain boundary across the fusion boundary, namely the continuousness of crack pass, affects the SCC behavior in LAS. Possible effect of multiple heat cycle of welding process on the formation of the continuous grain boundary has also been suggested.

  14. C202 Mechanistic study of Cr effect on FAC rate of carbon steel

    ABE Hiroshi, WATANABE Yutaka

    National Symposium on Power and Energy Systems　2011　(16)　291-292　2011/06/22

    Publisher: The Japan Society of Mechanical Engineers

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    Combined effects of Cr content and pH on flow accelerated corrosion (FAC) of carbon steels have been formulated and their relation to oxide scale characteristics based on detailed oxide layer characterizations using transmission electron microscope with X-ray analyzer have been discussed. It has been possible that the solubility of Fe_3O_4 was enhanced locally by the high H_2 partial pressure which results from the high corrosion rate. Cr concentration is highest at top surface of oxide layer, and that decrease from surface to oxide / metal interface gradually. It has been suggested that Cr enrichment stabilize oxide layer (decrease solubility of oxide layer), as a result, FAC suppressed.

  15. C211 Effect of material and environmental factors on FAC rate and on characteristics of oxide film of carbon steels

    WATANABE Yutaka, ABE Hiroshi

    National Symposium on Power and Energy Systems　2010　(15)　345-346　2010/06/20

    Publisher: The Japan Society of Mechanical Engineers

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    Combined effects of Cr content and pH on corrosion rate of carbon steels due to flow accelerated corrosion have been examined by experiments and their relation to oxide scale characteristics based on detailed oxide layer characterizations using transmission electron microscope with X-ray analyzer have been discussed. Effect of Cr content on FAC mitigation decrease continuously as pH is increased from neutral to 10.4 and effect of pH on that increase significantly from pH 9.1 to 9.4. Obvious Cr enrichment has been observed in the oxide layer of 1.01 wt % Cr content steel regardless pH condition. Cr concentration is highest at top surface of oxide layer, and that decrease from surface to oxide / metal interface gradually. It has been suggested that Cr enrichment stabilize oxide layer (decrease solubility and defect density of oxide layer), as a result, FAC suppressed.

  16. 製塩設備模擬環境におけるオーステナイト系合金の応力腐食割れ感受性

    津川 貴臣, 渡辺 豊, 阿部 博志

    日本海水学会誌　64　(3)　166-167　2010/05/20

    ISSN： 0369-4550

  17. B105 Study of FAC rate of carbon steels based on characterization of oxide film

    WATANABE Yutaka, ABE Hiroshi

    National Symposium on Power and Energy Systems　2009　(14)　59-60　2009/06/28

    Publisher: The Japan Society of Mechanical Engineers

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    Effects of Cr content and environmental factors, pH and dissolved oxygen concentration, on removal rate of carbon steels due to flow accelerated corrosion have been examined by experiments. Cr content holds a strong impact on the FAC rate regardless of pH values from 6.84 to 10.4. Addition of 1% Cr to carbon steel reduces the FAC rate by one order of magnitude under the environmental conditions, where magnetite forms. Detailed characterizations of oxide film formed on the specimen have been carried out by using SEM and TEM. Preferential corrosion of pearlite phase has been observed at specimen surface of low Cr content steel in early stage of FAC. It has been suggested that oxide structure and porosity were obviously different between low and high Cr content steels.

  18. 131 Metallurgical Study on Stress Corrosion Cracking of Type 316L Welds

    ABE Hiroshi, WATANABE Yutaka

    2008　(43)　63-64　2008/03/15

    Publisher: The Japan Society of Mechanical Engineers

Show all ︎Show first 5

Books and Other Publications 1

  1. Supercritical-Pressure Light Water Cooled Reactors

    Hiroshi Abe, Koichiro Ezato, Yoshinori Hamamoto, Yosuke Katsumura, Takeharu Misawa, Hideo Mori, Shinichi Morooka, Yusa Muroya, Yoshiaki Oka, Kazuyuki Takase, Yutaka Watanabe

    2014

Research Projects 17

  1. Mechanistic study on unique corrosion phenomena in specific environments and challenges to extend the service life of accelerators and irradiation facilities

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

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

    Institution: Tohoku University

    2023/04/01 - 2026/03/31

  2. 特殊環境下で発現する新規な腐食事象の機構解明と加速器・照射施設の長寿命化への挑戦

    阿部 博志

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 基盤研究(B)

    Category: 基盤研究(B)

    Institution: 東北大学

    2023/04/01 - 2026/03/31

  3. 古代の出土文化財が教えてくれる1000年超の腐食寿命予測モデル

    渡辺 豊, 宮崎 孝道, 阿部 博志, 柳田 明進, 山本 正弘

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 基盤研究(B)

    Category: 基盤研究(B)

    Institution: 東北大学

    2022/04/01 - 2025/03/31

  4. Proposal for Design Guidelines for Next-Generation Stainless Steel Weld Metal with Excellent Aging Resistance

    Hiroshi Abe

    Institution: Tohoku University

    2022/10 - 2025/03

  5. 軽水炉１次系隙間腐食抑止と隙間水質迅速浄化技術の開発：化学的ポンピング手法の創案

    渡辺 豊, 宮崎 孝道, 阿部 博志, 竹田 陽一, 青木 聡

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 基盤研究(B)

    Category: 基盤研究(B)

    Institution: 東北大学

    2019/04/01 - 2022/03/31

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    （１）バルク水環境の高純度水による置換のみを用いた通常の浄化手段と比較して、バルク水へのNa2MoO4あるいはK2MoO4の添加と高純度化を交互に行うことによる『化学的ポンピング操作』により隙間内浄化(Cl-の排出)が加速される効果を評価・実証した。すなわち、一定時間後の隙間内溶液のCl-濃度を、隙間内環境にモリブデン酸塩が共存している場合としていない場合で比較し、後者を基準としてモリブデン酸塩添加によるCl-排出促進効果を定量的に調査した。当該実験において、当初は、狭隘液絡部と液溜まり部を有するチタン製ブロックの試験体を使用していたが、同一条件下においてもCl-濃度のバラツキが大きいことが問題であった。そこで、ステンレス鋼製の針を有する注射器を改造して、狭隘液絡部と液溜まり部を有する試験体を作製することにより、試験後にイオン分析に持ち込むまでの操作を減らした。これによって、実験の再現性が格段に向上した。 （２）多様な条件下での予測技術への展開を図るため、COMSOLをベースとして、隙間内環境浄化のプロセスを再現可能な数値シミュレーションを実現した。 （３）NaCl水溶液中での隙間腐食試験へのトレーサー技術の適用方法を確立することを目標に予備試験を実施した。試験片にはSUS304ステンレス鋼製M4六角ボルトおよびナットを、試験溶液は0.6 mol/L NaCl水溶液(室温、放射能量8 kBq / 20.4mL (Cl- 20853 ppm))を用いた。30日間自然浸漬したがすきま腐食の発生は認められなかった。また、イメージングプレートを用いて36Cl-トレーサーを分析したが、今回の試験条件では検出できなかった。

  6. 溶接模擬熱処理を応用した粒界組織制御による応力腐食割れに免疫なステンレス鋼の創成 Competitive

    阿部 博志, 宮崎 孝道, 堀内 寿晃, 源 聡

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 基盤研究(B)

    Category: 基盤研究(B)

    Institution: 東北大学

    2019/04/01 - 2022/03/31

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    （１）粒界島状δ相分布組織を有するSCC耐性に優れた316L系ステンレス鋼の創成：母材成分と熱処理条件を実験変数とした島状δ相の成分・分布形態評価 昨年度までに作製した、粒界のみが優先的に溶融・凝固して島状δ相が分布した組織を有するオーステナイト系ステンレス鋼を対象として、詳細な組織観察を実施した。具体的には、エッチングにより金属組織を現出させて、粒径ならびに晶出した島状δ相の分布形態を調査した。フェライトスコープを用いたフェライト率の定量評価も併せて実施した。平均フェライト率と平均粒径の比較から、比較的フェライト量が多い試料では平均粒径が小さくなる傾向が明らかになった。この理由として、粒界に晶出した島状フェライトが結晶粒の成長を抑制した可能性が考えられた。従って機械特性ならびに耐SCC性の観点からは、フェライト分布形態に加えて平均粒径も考慮する必要があることが明らかになった。 （２）熱時効劣化感受性の低いδ相の成分設計指針の確立と実証：島状δ相の熱時効挙動の評価と計算科学によるミクロ組織変化予測 スピノーダル分解とG相析出・成長の理解のためには、G相の固溶の多様性の検討が必要であり、そのための熱力学データの整備を行った。具体的には、3副格子モデルによる熱力学関数の構築ならびに実験データとの合わせこみを実施した。加えて、この成果を反映させて新規開発した熱力学データベース(Gver6.54.2)によるG相析出のシミュレーションを行い、結果の妥当性を評価した。その結果、従来の結果と比較して精確で合理的な結果が得られた。この成果は、他の合金系への展開が期待される。

  7. オーステナイト系ステンレス鋼溶接金属の熱時効挙動ならびに高温水中 SCC 感受性に及ぼす加工硬化層の影響解明と表面仕上げ条件の最適化

    Offer Organization: 日本溶接協会

    System: 2021 年度次世代を担う研究者助成事業

    2021/04 - 2022/03

  8. ステンレス鋼溶接金属における熱時効脆化の速度論評価と組織異方性の影響解明に基づく長期信頼性担保 Competitive

    阿部 博志

    Offer Organization: 中部電力株式会社

    System: 原子力安全技術研究所 公募研究

    2019/07 - 2021/03

  9. Development of a visualization method of hidden damage for integrity evaluation of components exposed to a massive earthquake

    Watanabe Yutaka

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

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

    Institution: Tohoku University

    2016/04/01 - 2019/03/31

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    A potentiostatic etching method to visualize plastic strain introduced in stainless steels has been newly developed, where difference in dissolution rate of metal due to local mis-orientation caused by deformation twin or accumulation of dislocation at slip planes is utilized. This method can detect and quantify pre-existing plastic strain introduced in stainless steels at ambient temperature or at operating temperature of a nuclear reactor. The potentiostatic etching method has been first developed for Type 316 stainless steels and then a methodology has been developed in order to apply the etching method to evaluate other types of austenitic stainless steels. A procedure to apply the etching method to actual components has also been proposed.

  10. 加工硬化層の特徴抽出に基づく表面仕上げの最適化による耐応力腐食割れ性向上 Competitive

    阿部 博志

    Offer Organization: 中部電力株式会社

    System: 原子力安全技術研究所 公募研究

    2017/07 - 2019/03

  11. 金属組織学に基づく高信頼性ステンレス鋼溶接部の創成と寿命予測式の精緻化 Competitive

    阿部 博志

    Offer Organization: 日本学術振興会

    System: 科研費 若手研究(A)

    2015/04 - 2019/03

  12. Application of morphological analysis of the interface at oxide and alloy for continuous quantitative evaluation on initiation process of stress corrosion cracking

    Takeda Yoichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

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

    Institution: Tohoku University

    2014/04/01 - 2017/03/31

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    Essential reaction in Stress corrosion cracking is considered as oxidation, under the interaction with the influencing factors like grain boundary and strain distribution. With aiming to detect precursor and clarify overall process on crack initiation, quantitative characterization of morphology of the interface between formed oxide and alloy was carried out. The locations of the interface were used for quantitative characterization of localized oxidation. The parameter named depth of localized oxidation penetration was proposed and successfully obtained in terms of oxidation time. Before the crack initiation, not only monotonic increase of oxidation penetration but also recovering of those were clarified at short oxidation time region. High susceptible material indicated higher depth penetration and its increment before crack initiation. Crack initiation prediction was pronounced when both the value and trend of depth of localized oxidation penetration were reasonably evaluated.

  13. Hydrogen Embrittlement Suppression Based on Protective Film-Oriented Compositional Design

    WATANABE Yutaka, ABE Hiroshi, MIYAZAKI Takamichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

    Category: Grant-in-Aid for Challenging Exploratory Research

    Institution: Tohoku University

    2012/04/01 - 2014/03/31

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    Oxide species of which solubility of hydrogen is extremely low has been investigated based on literature survey. It has been considered that Cr2O3 shows excellent performance from the suppression of hydrogen permeation point of view. Hydrogen permeability of the oxide layer which formed on type 430 stainless steel with different condition of surface finish and oxidation treatment has been evaluated by electrochemical hydrogen permeation technique. Even a nanometer-scaled Cr rich oxide decrease the hydrogen permission current significantly. Different hydrogen permission current behaviors have been found for different type of surface finish and it may be due to the difference in protectiveness of oxide layer.

  14. 流れ加速型腐食抑制に及ぼす鋼中Crの作用機構解明と対策材におけるCr含有量の下限値の検討 Competitive

    阿部 博志

    Offer Organization: 社団法人日本鉄鋼協会

    System: 鉄鋼研究振興助成

    2012/04 - 2013/03

  15. 潜在的経年劣化事象を考慮した低炭素ステンレス鋼溶接部におけるSCC停留モデル確立 Competitive

    阿部 博志

    Offer Organization: 日本学術振興会

    System: 科研費 若手研究(B)

    2010/04 - 2012/03

  16. Understanding initiation processes of stress corrosion cracking by means of real time imaging and development of anti-SCC materials

    WATANABE Yutaka, TAKEDA Yoichi, OIKAWA Katsunari, ABE Hiroshi, MIYAZAKI Takamichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

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

    Institution: Tohoku University

    2010 - 2012

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    A visualization method has been developed, where local and transient anodic events occurring in initiation processes of stress corrosion cracking can be observed in a wide window and in real time. The initiation process was found to be intermittent and very small-scale anodic events and their repassivation. Cracks tend to initiate at the location where a few anodic events occur in proximity to each other. In most cases, oxide inclusions containing Si, Mg, or Al, provided initiation sites. Stress corrosion cracks tend to retard when they reach δ-ferrite located on grain boundaries (especially on triple points). We may be able to effectively improve SCC initiation life of steels by locatingδ-ferrite on grain boundaries as much as up to a few % of volume fraction.

  17. スピノーダル分解に着目した軽水炉における低炭素ステンレス銅溶接部のSCC機構解明

    阿部 博志

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 特別研究員奨励費

    Institution: 東北大学

    2007 - 2008

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    あらかじめ成分を調整した溶接フィラーを用いて2種類のSUS316L溶接試料を作製し、それらの溶接組織および化学組成・成分分布について詳細なキャラクタリゼーションを行うと共に、高温水中SCC発生・進展試験を行い、溶融境界近傍におけるき裂進展挙動に及ぼす微視組織の影響を明らかにした。特に、き裂先端およびその周辺において形成される酸化物および溶融境界近傍の組織的特徴に着目し、溶融境界近傍におけるSCCき裂進展遅延メカニズムを解明した。さらに、δ-フェライトのスピノーダル分解に着目し、低温時効を受けた材料におけるSCC進展メカニズムの成立性についても考察した。 1.SUS316L溶接試料のpartially melted zoneの粒界において、またSUS316NG溶接試料のunmixed zoneのγ-γ界面において島状δ-フェライトが分布していた。一方、き裂は母材においてはIGSCCで、溶接金属においてはIDSCCで進展することから、どちらの溶接試料においても溶融境界近傍においてき裂進展経路上に島状δ-フェライトが存在することが明らかになった。 2.き裂は母材で発生し、粒界を経路として溶接金属に向かって進展する。一方、partially melted zoneにおいてき裂の進展経路上(粒界)に島状のδ-フェライトが存在する。き裂がδ-フェライトに達した際に、δ-フェライトの一部が酸化されてき裂先端でCr_2O_3が形成される。これが酸素の拡散障壁として働き、き裂前方での固相酸化反応が抑制され、結果としてき裂が停留する。き裂停留後、き裂はδ-フェライトを迂回してから再び粒界を進展するが、次のδ-フェライトに遭遇する。これを繰り返すことにより、溶融境界近傍においてSCCき裂の進展遅延が起こる。 3.335℃・13200時間時効材においても、溶融境界近傍を進展するき裂の大部分において、その先端がδ-フェライトに達したところに位置していたため、本研究で明らかにしたき裂進展遅延メカニズムは、低温時効を受けた材料においても成立することが明らかになった。

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  1. Ag添着活性炭の腐食加速現象機構の解明研究

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    本研究は、多核種除去設備における接液材料の局部腐食に関して、汚染水処理機器において確認されている、Ag添着活性炭共存下での金属腐食の腐食加速現象の機構解明に向けた調査を実施する。

  2. 銀添着活性炭の腐食加速現象の機構解明と対策

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    東京電力株式会社福島第一原子力発電所の事故対策のための技術開発の一環で、多核種除去設備において確認されている、銀添着活性炭共存下での金属腐食に関し、調査を実施する。

  3. 流れ加速型腐食抑制に及ぼす鋼中Crの作用機構解明と対策材におけるCr含有量の下限値の検討

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    流れ加速型腐食（FAC）減肉速度に及ぼす鋼中Crの影響を複数の流動条件下で定量的に評価し、酸化皮膜構造との関わりを調査することで、減肉抑制に及ぼす鋼中Crの作用機構を明らかにする。厳しい流動条件下においても炭素鋼が優れた耐FAC性を発揮するCr含有量の下限値について検討し、FAC対策材の開発ならびに規格化につながる知見を得る。