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Ebihara, Kenichi; Yamaguchi, Masatake; Itakura, Mitsuhiro
Metallurgical and Materials Transactions A, 57(4), p.1480 - 1489, 2026/04
Times Cited Count：0 Percentile：0.00(Materials Science, Multidisciplinary)Hydrogen (H) embrittlement is an important issue for steel. The experimental thermal desorption spectra of H from an iron sample containing H-enhanced strain-induced vacancies (Vs) were successfully reproduced by revising a previous numerical model. In the revised model, we adopted concentration variables for Vs and V clusters, which are distinguished by the number of trapped H atoms. This revision eliminated the assumption of V and V cluster migration, required in the original model. Simulation results of the revised model revealed that the spike-like desorption on the peak attributed to Vs and V clusters in the spectra simulated by the original model was an artifact caused by the assumption. In addition, it was suggested that V clusters can exist other than Vs in the specimens after deformation with H charging. It is considered that the revised model is a useful framework for studying Vs and V clusters under H-affected conditions.
neutron diffraction study to elucidate hydrogen effect on the deformation mechanism in Type 310S austenitic stainless steelIto, Tatsuya; Ogawa, Yuhei*; Gong, W.; Mao, W.*; Kawasaki, Takuro; Okada, Kazuho*; Shibata, Akinobu*; Harjo, S.
Proceedings of the 7th International Symposium on Steel Science (ISSS 2024), p.237 - 240, 2024/11
Shibayama, Yuki; Hojo, Tomohiko*; Koyama, Motomichi*; Akiyama, Eiji*
International Journal of Hydrogen Energy, 88, p.1010 - 1016, 2024/10
Times Cited Count：10 Percentile：59.70(Chemistry, Physical)Higa, Ryota*; Fujihara, Hiro*; Toda, Hiroyuki*; Kobayashi, Masakazu*; Ebihara, Kenichi; Takeuchi, Akihisa*
Materials Transactions, 65(8), p.899 - 906, 2024/08
Times Cited Count：3 Percentile：20.18(Materials Science, Multidisciplinary)It is indispensable to suppress hydrogen embrittlement (HE) to develop the strength of the Al-Zn-Mg alloy. Because intergranular fracture (IGF) is mainly observed when HE occurs in the alloy, we need to understand the IGF initiation to suppress HE. In the present study, we investigated the stress, strain, and H concentration, which influence the IGF initiation, in actual fractured regions by simulation of a crystal plasticity finite element method and H diffusion analysis in a 3D image-based model, which was created based on 3D polycrystalline microstructure data obtained from X-ray imaging technique. Combining the simulation and in-situ observation of the tensile test sample by X-ray CT, we examined the stress, strain, and H concentration, and discussed the IG crack initiation condition. As a result, it is revealed that stress normal to grain boundary induced by crystal plasticity dominates IG crack initiation while the accumulation of H due to stress has little impact on it.
Nagase, Fumihisa; Uetsuka, Hiroshi
Proc. of Int. Topical Meeting on LWR Fuel Performance, 0, p.677 - 684, 1997/03
no abstracts in English
Nagase, Fumihisa; ; Komatsu, Kazushi*; Furuta, Teruo
JAERI-Review 95-012, 122 Pages, 1995/08
JAERI-Review-95-012.pdf:4.42MB
no abstracts in English
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Journal of Nuclear Science and Technology, 19(2), p.158 - 165, 1982/00
Times Cited Count：29 Percentile：90.93(Nuclear Science & Technology)no abstracts in English
-Steam Reaction and Rapid Cooling; ;
JAERI-M 9681, 19 Pages, 1981/09
no abstracts in English
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JAERI-M 9445, 37 Pages, 1981/04
no abstracts in English
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Journal of Nuclear Science and Technology, 18(9), p.705 - 717, 1981/00
Times Cited Count：45 Percentile：96.18(Nuclear Science & Technology)no abstracts in English
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JAERI-M 8081, 26 Pages, 1979/02
no abstracts in English
Ito, Tatsuya; Ogawa, Yuhei*; Gong, W.; Mao, W.*; Kawasaki, Takuro; Okada, Kazuho*; Shibata, Akinobu*; Harjo, S.
no journal, ,
Ito, Tatsuya; Ogawa, Yuhei*; Gong, W.; Kawasaki, Takuro; Okada, Kazuho*; Shibata, Akinobu*; Harjo, S.
no journal, ,
no abstracts in English
Ito, Tatsuya; Ogawa, Yuhei*; Gong, W.; Kawasaki, Takuro; Okada, Kazuho*; Shibata, Akinobu*; Harjo, S.
no journal, ,
