Interfacial microstructure and properties of steel bonded cemented carbide/Q235 steel by vacuum fusion

The composite plates of TiC-based steel bonded cemented carbides and Q235 steels were prepared by vacuum fusion. The interfacial microstructure and mechanical properties of the composite plates were investigated. The results show that, there is a certain width mutual dissolution zone between the steel bonded cemented carbides and Q235 steel matrix, and the width of the mutual dissolution zone depends on the fusion temperature and fusion time. Mn, Ni, and Mo elements diffuse from the steel bonded cemented carbides to the matrix through the mutual dissolution zone, and Fe element diffuses from the matrix to the steel bonded cemented carbides through the mutual dissolution zone. The mutual dissolution zone is the transition zone of microstructure, chemical composition, and microhardness. The shear strength of the composite plate interface is 176~245 MPa, indicating that the metallurgical bonding between the steel bonded cemented carbides and Q235 steels matrix is formed.