In situ study on the orientation and strain-rate correlation mechanism of hydrogen embrittlement behavior of ferrite under shear stress

LX Li and LS Liang and YH Wang and JY Liu and MH Sun and P Zhao and JH Hu and GT Xu and G Wang and K Xu, JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T, 33, 9674-9692 (2024).

DOI: 10.1016/j.jmrt.2024.11.271

This study investigates the effects of orientation and strain rate on the hydrogen-enhanced localized plasticity mechanism during shear deformation of interstitial free steel. The stress-orientation correlation of hydrogen embrittlement is related to atomic-scale mechanisms, as evidenced through in situ electron backscatter diffraction, slow-strain-rate shear testing, electron microscopic characterization, and molecular dynamics simulations. The dislocation density increment after hydrogen charging was 59.25% higher along the 100 crystallographic zone axis than along the 111 crystallographic zone axis, which is mainly attributed to the combined effect of strain- induced transport and interstitial diffusion of hydrogen atoms. The strain rate correlation of hydrogen embrittlement is also affected by the interstitial diffusion during the strain-induced transport of H. Interstitial diffused hydrogen induce dislocation forest emissions that promote local plasticity, which ultimately leads to the orientation and strain rate correlation of hydrogen embrittlement.

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