Abstract
Crack growth behaviors of a type 301 and a type 304 austenitic stainless steel under cathodic charging were examined. Hydrogen assisted accelerated crack growth was observed both under cyclic loading and sustained constant loading. Time dependent slow crack growth was observed above a threshold stress intensity factor of KIHE. The value of KIHE was found to be lowered by a superimposed cyclic load. This was considered to be due to the formation of the plasticity induced martensite and a cyclic sharpening effect at an advancing crack tip in this study. The time dependent crack growth was more pronounced by a sensitizing treatment in the type of 304 steel. Fracture surfaces corresponding to the time dependent crack growth were primarily quasi-cleavage fasets and were found to be associated with the hydrogen embrittlement.
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