Study on Microstructure and Properties of Laser Cladding WC/17-4PH Composite Coating
ZHANG Yongyan
WEI Tong
YANG Hai
HONG Fumin
SUN Weiwei
Abstract：Composite coatings of 17-4PH+WC with varying mass fractions were prepared on the surface of 45 steel using the Laserline LDF-3000-60 laser cladding technique.The microstructure,hardness,and wear resistance of the fused cladding layer were examined and analyzed using an optical microscope,microhardness tester,and friction-wear testing method.The results indicate that the average hardness of the fused cladding layer increases with the WC content.When the WC mass fraction is 25%,the coating achieves good metallurgical bonding with the substrate,displaying a uniform and dense structure,free from defects such as thermal cracks and porosity.The average hardness of the fused cladding layer is 497.6 HV,which is 153.0%higher than that of the substrate.When the WC mass fraction is 30%,an increase in the ceramic phase results in the appearance of through-cracks from the coating surface to the substrate,with the coating hardness rising 160.7%compared to the substrate,and wear volume being 26.2%of that of the substrate.These findings suggest that the coating exhibits optimal performance when the WC mass fraction is 25%.
Keywords：laser cladding17-4PHWC contentcomposite coatings
Publication Date：2024-11-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 48-52 )