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<p>The brittle fracture risk of pipeline steel that transports hydrogen increases. The fracture behaviors of X80 steel in different hydrogen environments were studied by slow strain rate tensile (SSRT) tests to evaluate the effects of adsorbed hydrogen and dissolved hydrogen on hydrogen embrittlement. The results showed that surface-adsorbed hydrogen and dissolved hydrogen in the bulk both increased the risk of hydrogen embrittlement. The adsorbed hydrogen played a more important role in hydrogen embrittlement than dissolved hydrogen in the bulk. Density functional theory (DFT) results showed that H-atom adsorption on the surface is exothermic, whereas adsorption in the bulk is endothermic. During penetration from the surface into the bulk, H atoms diffuse from the surface to the subsurface, encountering the largest diffusion energy barrier. H atoms prefer to stay on the surface rather than in the inner bulk. The high concentration of adsorbed hydrogen atoms on the surface is mainly responsible for hydrogen embrittlement.</p>

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Hydrogen Embrittlement of X80 Steel in Different Hydrogen Environments from the Perspective of Density Functional Theory Calculations

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • S. Y. Li,
  • W. M. Zhao,
  • J. J. Dai

摘要

The brittle fracture risk of pipeline steel that transports hydrogen increases. The fracture behaviors of X80 steel in different hydrogen environments were studied by slow strain rate tensile (SSRT) tests to evaluate the effects of adsorbed hydrogen and dissolved hydrogen on hydrogen embrittlement. The results showed that surface-adsorbed hydrogen and dissolved hydrogen in the bulk both increased the risk of hydrogen embrittlement. The adsorbed hydrogen played a more important role in hydrogen embrittlement than dissolved hydrogen in the bulk. Density functional theory (DFT) results showed that H-atom adsorption on the surface is exothermic, whereas adsorption in the bulk is endothermic. During penetration from the surface into the bulk, H atoms diffuse from the surface to the subsurface, encountering the largest diffusion energy barrier. H atoms prefer to stay on the surface rather than in the inner bulk. The high concentration of adsorbed hydrogen atoms on the surface is mainly responsible for hydrogen embrittlement.