The hydrogen effect on a X65 carbon steel was investigated using in-situ electrochemical nanoindentation approach. The alterations in elastic behavior, pop-in load, and hardness under hydrogen-free and hydrogen-charged conditions in both ferrite and bainite were compared and discussed. The results demonstrated a non-affected elastic behavior by hydrogen in both microconstituents. The homogeneous and heterogeneous dislocation nucleation are proposed as the dominant mechanisms for pop-in behavior in ferrite and bainite, respectively. In addition, the reduction of pop-in load by hydrogen in both microconstituents indicates a hydrogen-enhanced dislocation nucleation in both homogenous and heterogeneous manners. Moreover, a hydrogen-induced hardness increment was detected in both microconstituents, which is related to the hydrogen-enhanced lattice friction on dislocations. Also, the more prominent hardness increment in bainite was caused by its significantly more trapping sites.

使用原位电化学纳米压痕方法研究了氢对 X65 碳钢的影响。比较和讨论了在无氢和充氢条件下铁素体和贝氏体的弹性行为、突入载荷和硬度的变化。结果证明氢在两种微成分中均未影响弹性行为。均质和异质位错成核分别被认为是铁素体和贝氏体中弹出行为的主要机制。此外，两种微成分中氢对弹出载荷的减少表明氢增强的位错成核以同质和异质方式。此外，在两种微成分中都检测到氢致硬度增加，这与位错上氢增强的晶格摩擦有关。此外，贝氏体中更显着的硬度增加是由其明显更多的俘获位点引起的。