Tailoring of interface microstructure and bonding property in 1Cr17 / 8Cr13MoV / 1Cr17 stainless steel clad plate with Ni interlayer

Abstract

In this study, the 1Cr17/8Cr13MoV/1Cr17 stainless steel clade plate with Ni interlayer is taken as the research object. The composite rolling and spheroidizing annealing process are used to obtain a clad plate with ideal interface microstructures and excellent bonding properties, which solved the key problem of poor bonding properties in the field of stainless steel clad plate preparation. To reveal the strengthening mechanism of interfacial bonding, multi-scale characterizations are performed to investigate the regulation mechanism of Ni interlayer on elements diffusion and microstructure evolution at the interfacial region. The results suggest that the high density of geometrically necessary dislocations at the interface and the diffusion of Ni promote the formation of fine-grained zones, thereby the crack initiation resistance is improved. The Ni interlayer effectively inhibits the diffusion of C and Cr at the interface and forms a coherent interface with low lattice misfit at the interface of 8Cr13MoV/Ni and 1Cr17/Ni, which effectively improves the bonding strength and the macroscopic uniform plastic deformation capacity of the stainless steel clade plate.