A Study of Processing Cu/WC_P Composite Coatings by Laser Cladding

In this paper,laser processing was used to carry out laser cladding Cu/WC P composite coatings on 45 steel substrates.The influence rule of WC amount on the microstructure and the wear resistance of composite coatings was investigated.The results showed that by adjusting the content of WC,α-Cu solid solution and WC diphasic tissue can be found; when the content of WC is above 30%,some dot like WC particles will be found,which indicates that WC can melt and solute at a certain extent; between Cu/WC_P composite coatings and metal matrix there is a transition region in which the microstructures are the compounds of steel substrate and WC.The test of friction resistance of the Cu/WC_P composite coating was conducted on 40Cr grinding wheel and the result showed that the friction coefficient and the wearing amount are the least while the amount of WC is 10%.The test of friction resistance was conducted on horniness alloy grinding wheel and the result showed that the friction coefficient is the least while the amount of WC is 30%; the wearing amount is the least while the amount of WC is 10%.