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<p>Hydrogen embrittlement has emerged as a critical challenge that restricts the application of high-strength martensitic steel. The hydrogen embrittlement susceptibility and associated fracture morphologies of high-strength martensitic steel subjected to different aging durations were systematically examined via slow strain rate tensile tests, microstructural characterization, thermal desorption spectroscopy, and finite element simulations. The as-charged specimen exhibited predominantly intergranular fracture, governed by hydrogen-enhanced decohesion mechanism. After 3&#xa0;d of aging, quasi-cleavage fracture features occurred with reduced susceptibility to hydrogen embrittlement, accompanied by transgranular fracture governed by the hydrogen-enhanced localized plasticity mechanism. Extending the aging period to 8&#xa0;d yielded ductile fracture, indicative of superior hydrogen embrittlement resistance. A diffusion-kinetic finite element model was developed and shown to accurately predict hydrogen diffusion behavior, and finally quantitative correlations among aging duration, hydrogen concentration, and fracture mode transitions were established.</p>

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Effect of aging time on hydrogen embrittlement susceptibility in high-strength martensitic steel

  • 期刊论文

  • 发表日期：

    2026年4月2日

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  • Zhi-Hao Tian,
  • Chun-Lei Shang,
  • Peng-Hui Bai,
  • Hong-Hui Wu,
  • Xiang Li,
  • Ying-Dong Fu,
  • Yuan-Hao Wu,
  • Shui-Ze Wang,
  • Jun-Heng Gao,
  • Hai-Tao Zhao,
  • Chao-Lei Zhang,
  • Xin-Ping Mao

摘要

Hydrogen embrittlement has emerged as a critical challenge that restricts the application of high-strength martensitic steel. The hydrogen embrittlement susceptibility and associated fracture morphologies of high-strength martensitic steel subjected to different aging durations were systematically examined via slow strain rate tensile tests, microstructural characterization, thermal desorption spectroscopy, and finite element simulations. The as-charged specimen exhibited predominantly intergranular fracture, governed by hydrogen-enhanced decohesion mechanism. After 3 d of aging, quasi-cleavage fracture features occurred with reduced susceptibility to hydrogen embrittlement, accompanied by transgranular fracture governed by the hydrogen-enhanced localized plasticity mechanism. Extending the aging period to 8 d yielded ductile fracture, indicative of superior hydrogen embrittlement resistance. A diffusion-kinetic finite element model was developed and shown to accurately predict hydrogen diffusion behavior, and finally quantitative correlations among aging duration, hydrogen concentration, and fracture mode transitions were established.