Abstract
In this study, the effect of hydrogen on dislocation and twinning behavior along various grain boundaries in a high-manganese twinning-induced plasticity steel was investigated using an in situ micropillar compression test. The compressive stress in both elastic and plastic regimes was increased with the presence of hydrogen. Further investigation by transmission electron backscatter diffraction and scanning transmission electron microscope demonstrated that hydrogen promoted both dislocation multiplication and twin formation, which resulted in higher stress concentration at twin–twin and twin–grain boundary intersections.
Highlights
High-Mn twinning-induced plasticity (TWIP) steels with outstanding mechanical properties have drawn tremendous attention in the steel design and application realm [1, 2]
scanning electron microscopy (SEM) images of pristine micropillars fabricated at the high angle grain boundaries (HAGBs) are presented in Fig. 1c, d
T-EBSD results showed that dislocation transmission through both low angle grain boundaries (LAGBs) and HAGBs is suppressed by hydrogen, which was proposed as another possible strengthening mechanism [46]
Summary
High-Mn twinning-induced plasticity (TWIP) steels with outstanding mechanical properties have drawn tremendous attention in the steel design and application realm [1, 2]. The formation of twins can effectively suppress dislocation gliding, contributing to a pronounced dynamic strain hardening behavior. Like other steels and alloys, such high-strength material suffers from hydrogen-induced. Tremendous efforts have been dedicated to exploring the hydrogen embrittlement behavior in TWIP steels focusing on the effects of initial microstructure [19,20,21,22,23,24], alloying elements [25,26,27,28,29,30], strain rates [31, 32],
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