Abstract
Abstract The effects of the grain boundary on hydrogen embrittlement of AISI type 316 stainless steel were studied by means of in situ environmental cell straining techniques in a high voltage electron microscope. During hydrogen embrittlement the grain boundaries effectively blocked dislocations and dislocation pile-ups were developed. The grain boundary relieved the accumulated stress by activating grain boundary dislocation or stacking fault sources, and the ϵ martensitic phase nucleated and grew. The propagation of crack across a grain boundary was observed. A crack nucleated in a second grain close to the intersection of the pile-ups with the grain boundary and propagated along the second grain.
Published Version
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