Abstract
The present paper focuses on the underlying principles of the effect of S-phase on reducing hydrogen embrittlement susceptibility. Hydrogen permeation test indicates that S-phase formed by low-temperature carburising has minor effect on hydrogen diffusion. Moreover, hydrogen-induced phase transformation caused by hydrogen charging is suppressed in the presence of S-phase. The kernel average misorientation result indicates that lattice distortion introduced by hydrogen charging is suppressed in the presence of S-phase. Cross-sectional EBSD investigations on the surface layer of fractured samples show that S-phase remains extremely stable during tensile deformation after hydrogen charging.
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