Abstract
H13 coating, Stellite156 coating and WC/Ni62 composite coating were prepared on AISI H13 hot working die steel by laser cladding. By means of metallographic microscope, scanning electron microscope, microhardness tester and friction and wear tester, the microstructure, hardness and wear resistance of H13 and three cladding layers were compared and analysed. The results show that H13 alloy coating, Stellite156 alloy coating and WC/Ni62 composite coating all show good metallurgical bonding characteristics with H13 steel substrate. The H13 alloy coating is mainly composed of white reticular dendritic, black intercrystalline carbide, martensite and residual austenite; the Stellite156 alloy coating is mainly composed of primary γ-Co dendrites and eutectic tissues; the WC/Ni62 matrix composite coating is mainly composed of WC particles, dendrites and fine eutectic tissues. The average microhardness of the three cladding layers is obviously higher than that of the substrate. WC/Ni62 composite coating has the best wear resistance under dry wear conditions.
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