Hydrogen embrittlement of steel has been widely studied; however, the hydrogen behavior during thermoplastic deformation is still unknown. The hydrogen behavior in thermoplastic deformation may have a significant impact on the properties of materials after processing. In this study, hydrogen embrittlement samples were obtained using electrolytic hydrogen charging, and thermoplastic deformation experiments of hydrogen-charged samples at different temperatures were conducted. Hydrogen slightly increased the flow stress, particularly when the deformation temperature was 1123 K. Microstructure characterization revealed that the samples with a high hydrogen content had a higher dislocation density. Molecular dynamics and density functional theory calculations were performed to understand this mechanism. The difference in Gibbs free energy between systems showed that hydrogen reduced the driving force of defect recovery, making recovery more difficult. This microstructure evolution law explained the experimentally observed increase in the dislocation density due to hydrogen. The increase in dislocation density leads to an increase in the flow stress. This study provides useful information and understanding about the behavior of hydrogen during alloy processing. Improving the alloy processing method may be a powerful way to inhibit hydrogen embrittlement.

钢的氢脆已被广泛研究；然而，热塑性变形过程中的氢行为仍然未知。热塑性变形中的氢行为可能对加工后材料的性能产生重大影响。本研究采用电解充氢获得氢脆样品，并进行了不同温度下充氢样品的热塑性变形实验。氢略微增加了流动应力，特别是当变形温度为 1123 K 时。微观结构表征表明，氢含量高的样品具有更高的位错密度。进行分子动力学和密度泛函理论计算以了解这种机制。系统之间吉布斯自由能的差异表明氢降低了缺陷恢复的驱动力，使恢复更加困难。这种微观结构演化规律解释了实验观察到的氢引起的位错密度增加。位错密度的增加导致流动应力的增加。这项研究提供了有用的信息和对合金加工过程中氢行为的理解。改进合金加工方法可能是抑制氢脆的有效方法。位错密度的增加导致流动应力的增加。这项研究提供了有用的信息和对合金加工过程中氢行为的理解。改进合金加工方法可能是抑制氢脆的有效方法。位错密度的增加导致流动应力的增加。这项研究提供了有用的信息和对合金加工过程中氢行为的理解。改进合金加工方法可能是抑制氢脆的有效方法。