In situ neutron diffraction analysis of the deformation mechanism in Hydrogen-charged Fe-24Cr-19Ni-based austenitic stainless steel

伊東 達矢   ; 小川 祐平*; Gong, W.   ; Mao, W.*; 川崎 卓郎   ; 岡田 和歩*; 柴田 曉伸*; Harjo, S.   

Ito, Tatsuya; Ogawa, Yuhei*; Gong, W.; Mao, W.*; Kawasaki, Takuro; Okada, Kazuho*; Shibata, Akinobu*; Harjo, S.

Hydrogen is being considered as an alternative energy carrier to fossil fuels to achieve the goal of Carbon Neutrality. While hydrogen has historically been associated with causing steel embrittlement, Ogawa et al. reported that the introduction of hydrogen to a Fe-24Cr-19Ni-based (mass%) austenitic stainless steel (AISI Type 310S) enhances both strength and ductility, thus counteracts the embrittlement effect. Although this phenomenon was qualitatively explained by the hydrogen-induced solid-solution strengthening and the promotion of deformation twinning, the influence of hydrogen on the development of dislocations and stacking faults (, twin nuclei) during deformation remains less understood. The aim of this work is to investigate the effects of hydrogen on the evolution of these crystal defects and overall deformation mechanisms by using neutron diffraction measurements.