Microstructure and friction and wear properties of nickel coated WC iron based alloy coating

To improve the mechanical, friction and wear properties of 15Cr1Mo1V steel surface, a mixture of iron based alloy powder and nickel coated WC particles was used as raw materials to prepare a nickel coated WC iron based alloy coating on the surface of 15Cr1Mo1V steel using laser cladding technology. The influence of nickel coated WC mass fraction on the microstructure, phase composition, mechanical properties, friction and wear properties of the iron based alloy coating was analyzed. The results show that the phases of the nickel coated WC iron based alloy coating were Cr₂₃C₆, Fe₃W₃C, Fe₆W₆C and WC. With the increased of nickel coated WC content, the microstructure of iron based alloy coating was refined, and the precipitation of Cr₂₃C₆ and Fe₆W₆C increased. The microhardness, strength, toughness, plasticity and wear resistance of iron based alloy coatings were all improved. When the mass fraction of nickel coated WC was 30%, the microstructure of the iron based alloy coating was dense and the refinement effect was most obvious. The highest hardness of the coating reached 819 HV0.5. The tensile strength at room temperature and high temperature was 531, 508 MPa, and the yield strength at room temperature and high temperature was 383, 342 MPa. The impact absorption energy was 62.2 J, and the friction and wear resistance performance was the best.