Surface Nanocrystallization and Numerical Modeling of 316L Stainless Steel during Ultrasonic Shot Peening Process

Surface nanocrystallization of metals and alloys via high-frequency ultrasonic shot peening (USP) can significantly increase the mechanical properties materials. However, relationship between external process parameters internal microstructure materials is still unclear an accurate numerical model to simulate USP urgently required for better control grain refinement process. In this study, we successfully realized surface 316L stainless steel using with frequency amplitude 20 kHz 50 ?m, respectively. The evaluation during was revealed. We established a finite element calculated plastic strain stress distribution investigated effects frequency, working distance, on simulation method. dynamic behavior studied high-speed camera, FE results agreed well experimental results. also impact multiple shots by camera observation simulation. Research indicate that effective method obtain large-scale bulk nanocrystalline help scientists engineers understand steel.