Experimental Investigation of Fatigue Life Cycle Behaviour of Austenitic SS 316L

In this paper the fatigue life of 316L stainless steel through detailed experimental investigation has been carried out. The fatigue test performed for the mechanical testing and microstructural characterization. The rotary bending machines is used to find the cycle with a load ratio R = 0.1. The Specimens were tested under constant load, but load varied for different specimens to check the life cycle. S-N curve comparison shows the relationship between stress and number of cycle. Furthermore the fracture surfaces of the failed specimens were analysed using SEM to identify the sequence of damage evolution. It is revealed distinct zones associated with crack initiation at firstly surface voids, subsequent propagation through the microstructure, and final rupture. Overall, the experimental findings indicate that the fatigue limit of the material is approximately 140.40 MPa.