Research on strain-induced α'-martensite as hydrogen diffusion channel in austenitic stainless steel
The microstructural evolution and hydrogen embrittlement(HE)behaviors of 304 and 316L austenitic stainless steel(ASS)were investigated.The hydrogen desorption rate and hydrogen content of 304 and 316L ASS were measured by thermal desorption spec-trometer.The results show that compared with the solution-treated 304 ASS,the strain-induced α'-martensite is produced in cold-rolled sample,the hydrogen content increases,and the HE sensitivity increases.However,little α'-martensite is produced after cold rolling of 316L ASS,the hydrogen content is less,and the HE sensitivity is very low.The fractures of the four samples are all ductile fractures be-fore hydrogen charging and that of the cold-rolled 316L ASS is quasi-cleavage and cleavage fracture after hydrogen charging,while the fracture of cold-rolled 304 ASS is intergranular fracture after hydrogen charging.The role of strain-induced α'-martensite in hydrogen dif-fusion and HE mechanism is determined.
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