Effect of Shot Peening on Microstructure and Mechanical Properties of High‐Manganese Steel/304 Stainless‐Steel Clad Plates

The effect of shot peening on the interfacial element diffusion, microstructure, and mechanical properties of high‐manganese steel/304 stainless‐steel clad plate is studied. The modified diffusion constitutive model of the clad plate, which considers the effect of shot peening, has been established. Due to shot peening, a gradient structure is developed in the depth direction of high‐manganese steel, which promotes metallurgical bonding and corresponds to a sharp increase in shear strength from 236.6 ± 6.2 to 336.3 ± 8.5 MPa, an increase of 42%. Such a significant increase in shear strength results from the rise in dislocations on the composite interface, which provides diffusion pathways for the further diffusion of elements, leading to the increase in the diffusion distance of elements and the thickness of the interface layer.