Hydrogen‐induced degradation of X80 pipeline steel was investigated through a high strain rate tensile test (2 × 10⁻⁴/s) with interposed unloading, reloading, aging at 30°C, or annealing at 200°C with or without hydrogen charging. The results indicated that plasticity degradation does not occur in the hydrogen‐precharged specimens; however, hydrogen embrittlement occurs in the reloading stage when the specimens are charged with hydrogen in the unloading stage after applying a prestrain. Interposed aging at 30°C or annealing at 200°C can also increase the degradation. It indicates that the hydrogen traps caused by the strain along with hydrogen charging are the major source of dislocations. The formation of a hydrogen atmosphere around mobile dislocations, which is related to the rates of hydrogen diffusion and dislocation movement, plays an important role in the degradation process. Both pinning and depinning of dislocations affect plasticity degradation.

中文翻译：

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氢对高应变率拉伸试验下X80管线钢力学响应的影响

通过高应变率拉伸试验（2×10 ^-4）研究了X80管线钢的氢致降解/ s），并在不加氢的情况下进行介于30°C的卸载，重新装载，老化或200°C的退火处理。结果表明，在预充氢的试样中不会发生可塑性降解。但是，在施加预应变后，在卸载阶段向试样充氢时，在重新加载阶段会发生氢脆。在30°C时插入中间时效或在200°C时退火也可能增加降解。这表明，由应变引起的氢陷阱和氢电荷是位错的主要来源。移动位错周围氢气氛的形成与氢扩散和位错运动的速率有关，在降解过程中起着重要的作用。脱位的钉扎和脱钉都会影响可塑性的下降。