In order to improve the microhardness and wear resistance of 45#steel surface,Fe60 self-fusible alloy powder was used as cladding material to prepare cladding coating by laser cladding and laser remelting process.The microstructure of the coating was observed by scanning electron microscope(SEM),and the microhardness,wear resistance and wear mechanism of the coating were measured by Vickers hardness tester,wear test machine and three-dimensional morphometer.The results show that the microstructure of the coating dendrites prepared by laser cladding is larger,and the dendrite grains are finer and denser after laser remelting.Planar crystals are formed in the bonding regions of laser cladding coating,laser remelting coating and matrix,which results in metal-lurgical bonding.Compared with the matrix,the average hardness of the coating prepared by laser cladding is 682 HV,which is 3.43 times that of the matrix.The average hardness of the coating after laser remelting is 670 HV,which is 3.38 times higher than that of the matrix.After laser remelting and laser cladding,the friction coefficient and wear amount of the coating are significantly reduced compared with the matrix,and the wear amount is re-duced by 8 times and 2.67 times,respectively,and the wear resistance is significantly improved.The friction and wear forms of the coating are abrasive wear and adhesive wear.
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