Microstructure and tensile behavior of high-chromium cast iron/Hadfield steel composite fabricated by hot rolling process

Abstract This study employed a hot-rolling technique to fabricate a bimetal composite combining Hadfield steel and High-chromium cast iron (HCCI). The microstructure evolution and tensile properties of the bimetal composite were studied. Experimental results revealed that initial HCCI layers, characterized by limited plasticity, underwent necking and fragmentation into irregular fragments during deformation. The bonding interface of the two metals presented a wave shape. The two metals fused together and showed a good metallurgical bonding without interface cracks and delamination. The composite demonstrated an average tensile strength of 284 MPa. The results of tensile test showed that a large number of tunnel cracks were formed near the fracture of the sample. In the bimetallic composite, crack propagation stopped or transferred when encountering ductile Hadfield steel.