In order to improve the friction and wear properties of the 45 steel, Co-based alloy coatings were prepared on the substrate of 45 steel by supersonic induction cladding technology.The microstructure morphology, phase composition, microhardness and wear properties of coatings were studied.Results showed that the Co-based alloy coating was metallurgically bonded with the substrate, and no voids, cracks or other defects appeared on the coating.The coating was composed of complex phases, mainly including γ-Co, γ-(Fe, Ni), Cr23C6, Cr7C3, Co7W6, intermetallic compounds Co3Fe7 and FeNi3.Furthermore, the microhardness of the Co-based alloy coating was 573.1 HV0.2 N, which was 2.67 times higher than that of the substrate(215.0 HV0.2 N).Under the condition of dry friction condition at room temperature, the friction and wear properties of the coating were better than that of 45 steel substrate, and the wear forms of the coating were slight abrasive wear and adhesion wear.
