High Temperature Microstructure and Property of WC Ceramic Layer on Surface of Roll Forging Die by Powder Feeding Laser Cladding

Microstructure and hardness of self-smelting Co-base alloy without WC,self smelting Ni-base alloy plus WC and self smelting Co-base alloy plus WC powder feeding laser cladding layers at different temperatures were studied experimentally.The results show that microstrudues and properties of the three layers significantly differ in structure and property under the same laser processing parameters.For the Ni-base alloy,its hardness decreases markedly at 700℃ with an obvious structural change; for the Co-base alloys,the changes starts only at 700℃,and extent of the change with temperatures are smaller.Also,it has been proved that no prodigious change in the hardness of WC can be observed with the rise of temperature.