Microstructure and Wear Resistance of Laser Cladding Fe-based Alloy Coatings in Different Cladding Areas

Fe-based alloy coating was prepared on 27SiMn substrate by laser cladding technology,and the samples of the upper and middle regions of the cladding layer were obtained by turning.The microstructure,phase composition,hardness and wear resistance of different cladding areas were studied by SEM,XRD,microhardness,friction and wear tester.The results show that bcc phase content in the upper region of the cladding layer is less than that in the middle region of the cladding layer,and the upper region of the cladding layer contains more metal compounds Fe₂Si,Cr₂B and carbides M₇C₃ and M₅C₂.The hardness of the middle area of the cladding layer is higher than that of the upper area of the cladding layer.At the same time,the main wear mechanism of the upper area of the cladding layer is adhesive wear and abrasive wear.The wear mechanism of the middle area of the cladding layer is mainly abrasive wear.The wear resistance of the middle area of the cladding layer is better than that of the upper area of the cladding layer.