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Hojo, Tomohiko*; Koyama, Motomichi*; Kumai, Bakuya*; Zhou, Y.*; Shibayama, Yuki; Shiro, Ayumi*; Shobu, Takahisa; Saito, Hiroyuki*; Ajita, Saya*; Akiyama, Eiji*
ISIJ International, 65(2), p.284 - 296, 2025/02
Shibayama, Yuki; Hojo, Tomohiko*; Koyama, Motomichi*; Akiyama, Eiji*
International Journal of Hydrogen Energy, 88, p.1010 - 1016, 2024/10
Times Cited Count：1 Percentile：0.00(Chemistry, Physical)
ders band propagation in an Fe-5Mn-0.1C medium Mn steel clarified through 
scanning electron microscopyKoyama, Motomichi*; Yamashita, Takayuki*; Morooka, Satoshi; Yang, Z.*; Varanasi, R. S.*; Hojo, Tomohiko*; Kawasaki, Takuro; Harjo, S.
Tetsu To Hagane, 110(3), p.205 - 216, 2024/02
Times Cited Count：0 Percentile：0.00(Metallurgy & Metallurgical Engineering)ders deformation in an Fe-5Mn-0.1C medium-Mn steelKoyama, Motomichi*; Yamashita, Takayuki*; Morooka, Satoshi; Sawaguchi, Takahiro*; Yang, Z.*; Hojo, Tomohiko*; Kawasaki, Takuro; Harjo, S.
Tetsu To Hagane, 110(3), p.197 - 204, 2024/02
Times Cited Count：1 Percentile：54.79(Metallurgy & Metallurgical Engineering)ders band propagation in an Fe-5Mn-0.1C medium Mn steel clarified through scanning electron microscopyKoyama, Motomichi*; Yamashita, Takayuki*; Morooka, Satoshi; Yang, Z.*; Varanasi, R. S.*; Hojo, Tomohiko*; Kawasaki, Takuro; Harjo, S.
ISIJ International, 62(10), p.2043 - 2053, 2022/10
Times Cited Count：10 Percentile：66.38(Metallurgy & Metallurgical Engineering)ders deformation in an Fe-5Mn-0.1C medium-Mn steelKoyama, Motomichi*; Yamashita, Takayuki*; Morooka, Satoshi; Sawaguchi, Takahiro*; Yang, Z.*; Hojo, Tomohiko*; Kawasaki, Takuro; Harjo, S.
ISIJ International, 62(10), p.2036 - 2042, 2022/10
Times Cited Count：18 Percentile：83.42(Metallurgy & Metallurgical Engineering)Hojo, Tomohiko*; Shibayama, Yuki; Ajita, Saya*; Koyama, Motomichi*; Akiyama, Eiji*
Materia, 61(7), p.413 - 418, 2022/07
no abstracts in English
Nishimura, Hayato*; Hojo, Tomohiko*; Ajita, Saya*; Shibayama, Yuki*; Koyama, Motomichi*; Saito, Hiroyuki*; Shiro, Ayumi*; Yasuda, Ryo*; Shobu, Takahisa; Akiyama, Eiji*
Tetsu To Hagane, 107(9), p.760 - 768, 2021/09
Times Cited Count：0 Percentile：0.00(Metallurgy & Metallurgical Engineering)no abstracts in English
Nishimura, Hayato*; Hojo, Tomohiko*; Ajita, Saya*; Shibayama, Yuki*; Koyama, Motomichi*; Saito, Hiroyuki*; Shiro, Ayumi*; Yasuda, Ryo*; Shobu, Takahisa; Akiyama, Eiji*
ISIJ International, 61(4), p.1170 - 1178, 2021/04
Times Cited Count：7 Percentile：39.62(Metallurgy & Metallurgical Engineering)Shibayama, Yuki; Hojo, Tomohiko*; Koyama, Motomichi*; Saito, Hiroyuki*; Shiro, Ayumi*; Yasuda, Ryo*; Shobu, Takahisa; Matsuno, Takashi*; Akiyama, Eiji*
ISIJ International, 61(4), p.1322 - 1329, 2021/04
Times Cited Count：7 Percentile：39.62(Metallurgy & Metallurgical Engineering)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：17 Percentile：64.23(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.
Koyama, Motomichi*; Hojo, Tomohiko*; Miyamoto, Goro*; Morooka, Satoshi; Yamashita, Takayuki; Sawaguchi, Takahiro*; Mine, Yoji*; Mayama, Tsuyoshi*; Okitsu, Takayuki*; Sakakibara, Mutsumi*; et al.
no journal, ,
no abstracts in English
Harjo, S.; Miyamoto, Goro*; Shibata, Akinobu*; Koyama, Motomichi*; Yoshimi, Kyosuke*; Su, Y. H.; Takata, Shinichi; Gong, W.; Kawasaki, Takuro
no journal, ,
no abstracts in English
ders band propagation in a medium Mn steelKoyama, Motomichi*; Yamashita, Takayuki*; Morooka, Satoshi; Yang, Z.*; Varanasi, R.*; Hojo, Tomohiko*; Kawasaki, Takuro; Harjo, S.
no journal, ,
ders deformation of 5Mn-0.1C steels monitored by in-situ synchrotron X-ray diffraction under tensile loadingMorooka, Satoshi; Yamashita, Takayuki*; Koyama, Motomichi*; Shiro, Ayumi*; Tominaga, Aki; Shobu, Takahisa
no journal, ,
no abstracts in English
Morooka, Satoshi; Koyama, Motomichi*; Kawasaki, Takuro; Harjo, S.
no journal, ,
Morooka, Satoshi; Kawasaki, Takuro; Harjo, S.; Yamashita, Takayuki*; Koyama, Motomichi*; Sawaguchi, Takahiro*; Haga, Yoshinori
no journal, ,
no abstracts in English
ders band propagation in a medium Mn steelKoyama, Motomichi*; Hojo, Tomohiko*; Varanasi, R.*; Yamashita, Takayuki*; Morooka, Satoshi; Kawasaki, Takuro; Harjo, S.
no journal, ,
no abstracts in English
Ajita, Saya*; Nishimura, Hayato*; Hojo, Tomohiko*; Koyama, Motomichi*; Fujita, Kenichi*; Kakinuma, Hiroshi*; Akiyama, Eiji*; Shibayama, Yuki
no journal, ,
no abstracts in English
Morooka, Satoshi; Yamashita, Takayuki*; Koyama, Motomichi*; Harjo, S.; Shobu, Takahisa
no journal, ,
no abstracts in English
