Abstract
In order to evaluate the effect of stress concentration on long life fatigue properties of SUS316NG and SUS304TP, rotating bending fatigue tests were carried out using the specimen with artificial corrosion pits. And then, to evaluate the fatigue crack initiation and propagation properties from the pits, the stress intensity factor range was calculated by the pit diameter at surface and the pit depth which were obtained by optical microscope observations, and also it was calculated by the pit area on fracture surface which obtained by SEM observations. As the results, the surface fatigue crack initiation and propagation properties of both austenitic stainless steels could be evaluated by the value of the stress intensity factor range which calculated using the pit diameter at surface and maximum pit depth by the optical microscope observation.
