材料科学与工程学院知识库

The martensite/austenite MLS composite plates were fabricated by hot roll bonding of the alternately stacked 2Cr13 and 316L stainless steel plates. The effects of heat treatment on the microstructure transformation, interface behavior, tensile properties, fracture modes and failure mechanisms have been studied in depth. The microstructure of the composite plates is composed of austenite in 316L layers, martensite and a small amount of ferrite in 2Cr13 layers. After heat treatment, the microstructure of the composite plates changes from rolling texture to equiaxed grains. Most importantly, the recrystallization and thermal diffusion formed after heat treatment can effectively increase the overall plasticity of composite plates at the expense of small strength and hardness, improve the interface deformation compatibility and interfacial bonding strength, change the fracture mode from the quasi-cleavage fracture into the full dimple fracture, and fracture mechanism from the interface failure into the intralayer failure.