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<p>The hydrogen permeation kinetics of X80 steel under both constant stress and slow strain rate tension (SSRT) stress were investigated using in-situ stress hydrogen permeation techniques. Under constant stress of 70, 80, 90% <i>σ</i><sub>s</sub>, the diffusion coefficient and subsurface hydrogen concentration of X80 steel are positively correlated with the applied stress, and when the stress is 98% <i>σ</i><sub>s</sub> the hydrogen trapping effect of dislocations led to a decrease in the diffusion coefficient and a further increase in the subsurface hydrogen concentration. Further, the hydrogen trapping effect in dislocations leads to the decrease in the hydrogen diffusion coefficient and increase in the subsurface hydrogen concentration. Under SSRT stress, the hydrogen permeation flux shows a minimum value with increasing stress during the initial stage of plastic deformation due to the dual effects of hydrogen trapping in dislocations and the dynamic compensation of subsurface hydrogen concentration. With the continuous increase in the stress level, dislocation plays a dominant role in hydrogen transport, and the hydrogen permeation flux increases slowly.</p>

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Hydrogen Permeation Behavior of X80 Steel under Constant and Slow Strain Rate Tension Stress

  • 期刊论文

  • 发表日期：

    2025年3月10日

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  • Yunying Xing,
  • Zhile Yang,
  • Qian Zhao,
  • Lei Zhang

摘要

The hydrogen permeation kinetics of X80 steel under both constant stress and slow strain rate tension (SSRT) stress were investigated using in-situ stress hydrogen permeation techniques. Under constant stress of 70, 80, 90% σs, the diffusion coefficient and subsurface hydrogen concentration of X80 steel are positively correlated with the applied stress, and when the stress is 98% σs the hydrogen trapping effect of dislocations led to a decrease in the diffusion coefficient and a further increase in the subsurface hydrogen concentration. Further, the hydrogen trapping effect in dislocations leads to the decrease in the hydrogen diffusion coefficient and increase in the subsurface hydrogen concentration. Under SSRT stress, the hydrogen permeation flux shows a minimum value with increasing stress during the initial stage of plastic deformation due to the dual effects of hydrogen trapping in dislocations and the dynamic compensation of subsurface hydrogen concentration. With the continuous increase in the stress level, dislocation plays a dominant role in hydrogen transport, and the hydrogen permeation flux increases slowly.