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Journal Articles

Enhancement of uniform elongation by temperature change during tensile deformation in a 0.2C TRIP steel

Tsuchida, Noriyuki*; Harjo, S.

Metals, 11(12), p.2053_1 - 2053_16, 2021/12

AA2022-0310.pdf:1.71MB

 Times Cited Count:2 Percentile:10.12(Materials Science, Multidisciplinary)

Journal Articles

Hydrogen embrittlement resistance of pre-strained ultra-high-strength low alloy TRIP-aided steel

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:62.19(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.

Journal Articles

Martensite phase stress and the strengthening mechanism in TRIP steel by neutron diffraction

Harjo, S.; Tsuchida, Noriyuki*; Abe, Jun*; Gong, W.*

Scientific Reports (Internet), 7(1), p.15149_1 - 15149_11, 2017/11

AA2017-0453.pdf:3.62MB

 Times Cited Count:129 Percentile:94.66(Multidisciplinary Sciences)

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