Effects of Ni Concentration and Aging Heat Treatment on the Hydrogen Embrittlement Behavior of Precipitation-Hardened High-Mn Austenitic Steel

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  • Hosoda Takashi
    Research & Development Center, Sanyo Special Steel Co., Ltd.
  • Ogawa Yuhei
    Department of Mechanical Engineering, Kyushu University Research Center for Hydrogen Industrial Use and Storage (HYDROGENIUS), Kyushu University
  • Takakuwa Osamu
    Department of Mechanical Engineering, Kyushu University Research Center for Hydrogen Industrial Use and Storage (HYDROGENIUS), Kyushu University
  • Motomura Susumu
    Department of Hydrogen Energy Systems, Graduate School of Engineering, Kyushu University, now Takenaka Corporation
  • Hosoi Hyuga
    Department of Hydrogen Energy Systems, Graduate School of Engineering, Kyushu University, now Toyota Motor Corporation
  • Matsunaga Hisao
    Department of Mechanical Engineering, Kyushu University Research Center for Hydrogen Industrial Use and Storage (HYDROGENIUS), Kyushu University International Institute for Carbon-Neutral Energy Research (I<sup>2</sup>CNER), Kyushu University

Bibliographic Information

Other Title
  • 析出硬化型高Mnオーステナイト鋼の水素脆化挙動に及ぼすNi含有量および時効熱処理の影響
  • セキシュツ コウカガタ コウMn オーステナイトコウ ノ スイソゼイカ キョドウ ニ オヨボス Ni ガンユウリョウ オヨビ ジコウ ネツ ショリ ノ エイキョウ

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Description

<p>The effects of Ni concentration and dispersed conditions of vanadium carbide (VC) nano-particles on the hydrogen embrittlement (HE) behavior of precipitation-hardened high-Mn austenitic steels were investigated under the presence of thermally pre-charged hydrogen. Slow strain-rate tensile tests revealed that HE susceptibility decreased with an addition of Ni. VC precipitates functioned as the trapping sites for dissolved hydrogen, though its effect on resisting the HE was trivial. Hydrogen enhanced intergranular (IG) fracture wherein its area fraction was increased with the hardening by VC as well as with the escalation of internal hydrogen concentration. The IG fracture was the primary rationale for the hydrogen-induced loss of ductility. Possible mechanisms of the IG-related HE as well as future strategy for mitigating the mechanical degradation is discussed based on the fractographic observation and post-mortem microstructural analyses.</p>

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 108 (2), 156-172, 2022

    The Iron and Steel Institute of Japan

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