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<p>This work examined the effect of variant selection on hydrogen embrittlement (HE) in austenitic stainless steel associated with martensite. The single-variant martensite and multi-variant martensite were introduced into the austenitic stainless steel, and the corresponding HE behavior was comparatively investigated. The introduction of multi-variant martensite led to a higher proportion of Σ3 grain boundary, while introduction of single-variant martensite was accompanied by a higher MUD of &lt; 111 &gt; oriented grains. Σ3 grain boundary can trap more hydrogen steadily as irreversible hydrogen traps and impede the free migration of hydrogen as three-dimensional diffusion barriers, thereby suppressing the brittle intergranular fracture by disrupting the connectivity of RGBs. A higher MUD of &lt; 111 &gt; oriented grains promoted the diffusion of hydrogen in the steel with single-variant martensite, accordingly increasing the susceptibility to hydrogen embrittlement. Under the combined effect of two factors, a considerably higher HE resistance was achieved in the steel with multi-variant martensite. This work provided a new insight into the effect of variant selection on HE and offered a novel approach for martensite design to alleviate HE in austenitic stainless steel with martensite.</p>

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Superior hydrogen embrittlement resistance associated with martensite in austenitic stainless steel achieved by modulating variant selection

  • 期刊论文

  • 发表日期：

    2026年3月28日

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  • Xiaohui Xi,
  • Tong Wu,
  • Zhikun Liu,
  • Yongchang Zheng,
  • Jinliang Wang,
  • Ning Xu,
  • Zhen Zhang,
  • Qiang Liu

摘要

This work examined the effect of variant selection on hydrogen embrittlement (HE) in austenitic stainless steel associated with martensite. The single-variant martensite and multi-variant martensite were introduced into the austenitic stainless steel, and the corresponding HE behavior was comparatively investigated. The introduction of multi-variant martensite led to a higher proportion of Σ3 grain boundary, while introduction of single-variant martensite was accompanied by a higher MUD of < 111 > oriented grains. Σ3 grain boundary can trap more hydrogen steadily as irreversible hydrogen traps and impede the free migration of hydrogen as three-dimensional diffusion barriers, thereby suppressing the brittle intergranular fracture by disrupting the connectivity of RGBs. A higher MUD of < 111 > oriented grains promoted the diffusion of hydrogen in the steel with single-variant martensite, accordingly increasing the susceptibility to hydrogen embrittlement. Under the combined effect of two factors, a considerably higher HE resistance was achieved in the steel with multi-variant martensite. This work provided a new insight into the effect of variant selection on HE and offered a novel approach for martensite design to alleviate HE in austenitic stainless steel with martensite.