Fatigue Strength Evaluation of Etch-pitting SUS316NG Material

Abstract

In order to investigate the effect of corrosion damage like as corrosion pits on high cycle fatigue strength of SUS316NG which was used for nuclear power generation plant, rotating bending fatigue tests were carried out using the specimen which has a few artificial corrosion pits. As a result, the fatigue strength at (10)^8 cycle of specimen having corrosion pits was much lower than that specimen without pits. The decrease of fatigue strength at (10)^8 cycles was explained by treating a stress concentration factor from shapes of each corrosion pits as fatigue strength reduction factor.