We investigated the effects of hydrogen on ε-martensite-related damage evolution (crack/void initiation and growth) in Fe-Mn-Si-base austenitic steel using tensile tests after gaseous hydrogen charging at 100 MPa. Specifically, we evaluated the quantitative hydrogen effects on ε-martensite fraction and associated damage evolution with different strains and strain rates. Hydrogen charging increased the probability of ε-martensite-related damage initiation and deteriorated micro-damage arrestability, which decreased elongation. The primary factor causing the detrimental hydrogen effects on resistance to damage evolution was the promotion of deformation-induced γ-ε martensitic transformation. An increasing strain rate from 10⁻⁴ to 10⁻² s⁻¹ suppressed the γ-ε martensitic transformation and correspondingly increased elongation. Interestingly, the ε-martensite fraction near the fracture surface did not change with increasing strain rate, but the area fraction of the brittle-like fracture region decreased. This fact implied that the brittle-like fracture at the low strain rate, which had a longer time for damage growth, was assisted by stress-driven hydrogen diffusion near the crack/void tips.

我们使用在100 MPa气态充氢后进行的拉伸试验，研究了氢对Fe-Mn-Si基奥氏体钢中ε-马氏体相关损伤演变（裂纹/空隙萌生和生长）的影响。具体而言，我们评估了氢对ε-马氏体组分的定量影响以及与不同菌株和菌株速率相关的损伤演化。充氢增加了ε-马氏体相关损伤引发的可能性，并降低了微损伤的阻止能力，从而降低了伸长率。导致氢不利于抗损伤发展的主要因素是变形诱导的γ - ε的促进马氏体转变。从10 ^-4到10 ^-2 s ^-1的应变率增加抑制了γ - ε马氏体相变并相应地增加了伸长率。有趣的是，断裂表面附近的ε-马氏体部分并没有随应变率的增加而变化，而脆性断裂区域的面积部分却有所减少。这一事实表明，应力驱动的氢在裂纹/空隙尖端附近的扩散辅助了低应变速率下的脆性断裂（具有更长的损伤增长时间）。