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<p>To solve the problems of low hardness and poor wear resistance of low alloy steel surfaces, a laser cladding (LC) layer was prepared on 35CrMnSi steel by using W6Mo5Cr4V2 powder as well as a mixed powder containing W6Mo5Cr4V2 and 10%, 20% and 30% of WC. The microstructure of different cladding layers was analyzed, and the effect of the cladding layer composition on the hardness and wear resistance was investigated. The cladding layers prepared by using a mixed powder of W6Mo5Cr4V2-10%WC and W6Mo5Cr4V2-20%WC had good bonding effects with the substrate, and that of W6Mo5Cr4V2-30%WC was almost not cladded on the substrate. The microstructure of the W6Mo5Cr4V2 cladding layer was predominantly dendritic in shape. As the mass fraction of WC increased, the microstructure of the cladding layer evolved from dendritic shape to net shape. More granular carbides and intermetallic compounds were precipitated at grain boundaries and within grains. Compared with the W6Mo5Cr4V2 cladding layer, the hardness inside the W6Mo5Cr4V2-10%WC and W6Mo5Cr4V2-20%WC cladding layers and in the heat-affected zone was significantly improved. The average hardness of the W6Mo5Cr4V2 cladding layer and the heat-affected zones was 755.63 HV and 379.75 HV. After adding 10% and 20% WC, respectively, in the powder to prepare the cladding layer, the average hardness of the cladding layers increased to 778.24 HV and 794.28 HV, and that of the heat-affected zone was 424.25 HV and 408.15 HV. The friction coefficient of the cladding layer with the addition of WC powder was significantly reduced, the spalling pits on the wear scar surface were reduced, the wear scar depth was shallower, and the wear mass loss was reduced. The wear scar of the W6Mo5Cr4V2-20%WC powder cladding layer was the shallowest at 31&#xa0;μm, and the surface showed the best wear resistance, related to the combined effect of the microstructure and hardness of the cladding layer.</p>

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Effect of WC Powder Addition on Microstructure and Wear Resistance of Laser Cladded 35CrMnSi Cladding Layers

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Jidong Xu,
  • Bo Li,
  • Mingfeng Zhang,
  • Xingfu Yu,
  • Yong Su,
  • Yanbin Li

摘要

To solve the problems of low hardness and poor wear resistance of low alloy steel surfaces, a laser cladding (LC) layer was prepared on 35CrMnSi steel by using W6Mo5Cr4V2 powder as well as a mixed powder containing W6Mo5Cr4V2 and 10%, 20% and 30% of WC. The microstructure of different cladding layers was analyzed, and the effect of the cladding layer composition on the hardness and wear resistance was investigated. The cladding layers prepared by using a mixed powder of W6Mo5Cr4V2-10%WC and W6Mo5Cr4V2-20%WC had good bonding effects with the substrate, and that of W6Mo5Cr4V2-30%WC was almost not cladded on the substrate. The microstructure of the W6Mo5Cr4V2 cladding layer was predominantly dendritic in shape. As the mass fraction of WC increased, the microstructure of the cladding layer evolved from dendritic shape to net shape. More granular carbides and intermetallic compounds were precipitated at grain boundaries and within grains. Compared with the W6Mo5Cr4V2 cladding layer, the hardness inside the W6Mo5Cr4V2-10%WC and W6Mo5Cr4V2-20%WC cladding layers and in the heat-affected zone was significantly improved. The average hardness of the W6Mo5Cr4V2 cladding layer and the heat-affected zones was 755.63 HV and 379.75 HV. After adding 10% and 20% WC, respectively, in the powder to prepare the cladding layer, the average hardness of the cladding layers increased to 778.24 HV and 794.28 HV, and that of the heat-affected zone was 424.25 HV and 408.15 HV. The friction coefficient of the cladding layer with the addition of WC powder was significantly reduced, the spalling pits on the wear scar surface were reduced, the wear scar depth was shallower, and the wear mass loss was reduced. The wear scar of the W6Mo5Cr4V2-20%WC powder cladding layer was the shallowest at 31 μm, and the surface showed the best wear resistance, related to the combined effect of the microstructure and hardness of the cladding layer.