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Hojo, Tomohiko*; Kumai, B.*; Koyama, Motomichi*; Akiyama, Eiji*; Waki, Hiroyuki*; Saito, Hiroyuki*; Shiro, Ayumi*; Yasuda, Ryo*; Shobu, Takahisa; Nagasawa, Akihiko*
International Journal of Fracture, 224(2), p.253 - 260, 2020/08
Times Cited Count：14 Percentile：67.28(Materials Science, Multidisciplinary)In the study, the pre-strain effect on hydrogen embrittlement property of the ultra-high-strength transformation-induced plasticity -aided bainitic ferrite steel was investigated towards application for automobile frame parts. 3-10% tensile pre-strain suppressed hydrogen-induced mechanical degradation relative to total elongation while 12-15% pre-strained specimen did not exhibit elongation after hydrogen charging. The advantageous effect of the 3-10% pre-strain was attributed to the suppression of crack initiation related to retained austenite. The TRIP by pre-straining decreased the volume fraction of retained austenite before hydrogen charging, thereby reducing existing probabilities of preferential crack initiation sites and propagation paths. Conversely, high pre-strain such as 12-15% does not effectively work due to work hardening resulting in increases in hydrogen embrittlement susceptibility and a significant increase in hydrogen content due to the multiplication of dislocations.
Kimura, Atsushi; Nagasawa, Naotsugu; Shimada, Akihiko; Taguchi, Mitsumasa
Radiation Physics and Chemistry, 124, p.130 - 134, 2016/07
Times Cited Count：9 Percentile：64.88(Chemistry, Physical)no abstracts in English
CKikuma, Hiroyuki*; Takeuchi, Yukiko*; Nakamura, Shunsuke*; Sugimoto, Masaki; Nagasawa, Naotsugu; Shimada, Akihiko; Hakoda, Teruyuki; Taguchi, Mitsumasa
no journal, ,
no abstracts in English
Nagasawa, Naotsugu; Kimura, Atsushi; Idesaki, Akira; Ishii, Yasuyuki; Yamada, Naoto; Koka, Masashi; Shimada, Akihiko; Okubo, Takeru; Sato, Takahiro; Taguchi, Mitsumasa
no journal, ,
no abstracts in English
Kimura, Atsushi; Nagasawa, Naotsugu; Shimada, Akihiko; Taguchi, Mitsumasa
no journal, ,
no abstracts in English
