In situ neutron diffraction study to elucidate hydrogen effect on the deformation mechanism in Type 310S austenitic stainless steel

Tatsuya Ito; Yuhei Ogawa; Wu Gong; Wenqi Mao; Takuro Kawasaki; Kazuho Okada; Akinobu Shibata; Stefanus Harjo

doi:10.2355/isijisss.2024.0_237

ポスター In situ neutron diffraction study to elucidate hydrogen effect on the deformation mechanism in Type 310S austenitic stainless steel

Tatsuya Ito (J-PARC Center, Japan Atomic Energy Agency) ; Yuhei Ogawa (Research Center for Structural Materials/Materials Evaluation Field/Steel Research Group, National Institute for Materials Science) ; Wu Gong (J-PARC Center, Japan Atomic Energy Agency) ; Wenqi Mao (J-PARC Center, Japan Atomic Energy Agency) ; Takuro Kawasaki (J-PARC Center, Japan Atomic Energy Agency) ; Kazuho Okada (Research Center for Structural Materials/Materials Evaluation Field/Steel Research Group, National Institute for Materials Science) ; Akinobu Shibata (Research Center for Structural Materials/Materials Evaluation Field/Steel Research Group, National Institute for Materials Science) ; Stefanus Harjo (J-PARC Center, Japan Atomic Energy Agency)

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Tatsuya Ito, Yuhei Ogawa, Wu Gong, Wenqi Mao, Takuro Kawasaki, Kazuho Okada, Akinobu Shibata, Stefanus Harjo. In situ neutron diffraction study to elucidate hydrogen effect on the deformation mechanism in Type 310S austenitic stainless steel. https://doi.org/10.2355/isijisss.2024.0_237

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(abstract)

Hydrogen embrittlement has long been an obstacle to the development of safe infrastructure. However, in contrast to hydrogen's embrittling effect, recent research has revealed that the addition of hydrogen improves both the strength and uniform elongation of AISI Type 310S austenitic stainless steel. A detailed understanding of how hydrogen affects the deformation mechanism of this steel could pave the way for the development of more advanced materials with superior properties. In the present study, in situ neutron diffraction experiments were conducted on Type 310S steel with and without hydrogen-charged to investigate the effect of hydrogen on the deformation mechanism. In addition to the effect of solid-solution strengthening by hydrogen, the q-value, a parameter representing the proportion of edge and screw dislocations in the accumulated dislocations, was quantitatively evaluated using CMWP analysis on neutron diffraction patterns. The comparison of q-values between the hydrogen-charged and non-charged samples reveals that hydrogen has minimal effect on dislocation character in Type 310S steel.

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