Abstract
Heterogeneous plastic strain is essential for understanding hydrogen-induced crack (HIC) initiation in twining-induced plasticity (TWIP) steel with relatively no microtexture. In this study, electron backscattered diffraction technology was used to quantitatively characterize the heterogeneous plastic strain after a slow strain rate test with hydrogen charging, and the deformation mode and HIC initiation mechanism were clarified. From a statistical analysis of more than 100 grain boundaries, the cracked grain boundary and its vicinity have high heterogeneous strain; that is, the geometrically necessary dislocation density is high, and vice versa. Therefore, high strain incompatibility is the key factor for HIC initiation.
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