Hydrogen embrittlement of ultrafine-grained austenitic stainless steels processed by high-pressure torsion at moderate temperature

Yoji Mine, Daisuke Haraguchi, Takahiro Ideguchi, Nobuaki Horita, Zenji Horita, Kazuki Takashima

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)

    Abstract

    The effect of hydrogen on the plasticity of ultrafine-grained austenite was studied on type 304, 316L, and 310S stainless steels processed by high-pressure torsion at moderate temperature. Like austenitic steels with ordinary grain sizes, the hydrogen-induced ductility loss for the ultrafine grains became more pronounced with decreasing stability of the austenitic phase. For all the steels, the uniform elongation was limited by strengthening due to the ultra grain refinement; the ultrafine-grained 310S stable austenitic steel further exhibited a small local elongation due to a lack of martensitic transformation. The ductility loss due to hydrogenation for 316L steel with an intermediate austenite stability was retained to a moderate level. The ultrafine-grained 304 metastable austenitic steel exhibited a serious ductility loss induced by hydrogen showing localised shear deformation. This suggests that the dynamic martensite transformation plays a crucial role in the hydrogen embrittlement of ultrafine-grained metastable austenitic steel.

    Original languageEnglish
    Pages (from-to)1083-1090
    Number of pages8
    Journalisij international
    Volume56
    Issue number6
    DOIs
    Publication statusPublished - 2016

    All Science Journal Classification (ASJC) codes

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

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