The initiation and propagation of hydrogen-induced cracks (HICs) in twining-induced plasticity (TWIP) steel were quantificationally explored based on the HIC statistics at a macro level and a micro level by slow strain rate tensile (SSRT) with in-situ hydrogen-charging and electron microanalysis. The heterogeneous deformation and grain boundary character determines a HIC initiation. The slip transfer parameter m′ < 0.93 and the minimum residual Burgers vector of residual dislocations on a grain boundary b_r > 0.19 were the critical condition for HIC initiation. Moreover, HICs prone to initiate and propagate along random grain boundaries (RGBs), while the Σ3 grain boundaries and vice.

基于宏观水平和微观水平的 HIC 统计，通过原位氢慢应变率拉伸 (SSRT) 量化研究了孪晶诱导塑性 (TWIP) 钢中氢致裂纹 (HIC) 的萌生和扩展-充电和电子微量分析。异质变形和晶界特征决定了 HIC 引发。滑移传递参数米'<0.93并且在晶粒边界残留的位错的最小残余伯格斯矢量b _{- [R} > 0.19是为HIC开始时的临界条件。此外，HIC 易于沿随机晶界 (RGB) 启动和传播，而Σ 3 晶界则相反。