EFFECT OF HYDROGEN ON CREEP IN AUSTENITIC STAINLESS STEEL

The dynamic charging does not influence on the creep rate of type 321 austenitic stainless steel if the initial strain was less than 2%, in which the amounts evolving hydrogen after test were below 1.5 ppm (by wt). However, the creep rate increased markedly when the initial strain was larger then 8% or the specimen was precharged for a long time. In the case the corresponding amount evolving hydrogen was 5 to 12 ppm (by wt).