Abstract
Deformation-induced martensitic transformation of unstable austenite is a critical factor in the hydrogen embrittlement of austenitic and austenite-containing steels. It has previously been shown to increase the effective hydrogen diffusivity within the steel and to release hydrogen into the microstructure. This study of a bainitic steel, however, shows opposite trends. Despite most retained austenite transforming into martensite, the hydrogen release was not detected. More surprisingly, hydrogen exhibits significantly lower diffusivity after deformation. This is attributed to the generation of defects, acting as hydrogen traps, which offset the transformation-induced hydrogen release and reduce the effective hydrogen diffusivity.
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