Characterization of shot peening properties and modelling on the fatigue performance of 304 austenitic stainless steel

In this paper, the stress relaxation behavior and fatigue performance of SS304 materials treated with three shot peening intensities (0.1 mmA, 0.25 mmA and 0.4 mmA) were studied and a life prediction model was proposed. The model can describe the stress relaxation process and fatigue failure process of shot peening specimens completely combined with the surface morphology of the specimens treated with different shot peening intensities. The predicted fatigue lives of three kinds of shot peening intensities based on the model was in good agreement with the test lives. Besides, the model can describe the life transition behavior of shot peening specimens under high mechanical stress levels and explained the life transition mechanism combined with the test results.