Effect of Laser Power on Microstructure and Wear Resistance of WCP/Ni Cermet Coating

钢铁研究学报(英文版), 2006, 13(3): 74-78.

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1.School of Materials Science and Technology, Anhui University of Technology, Ma′anshan 243002, Anhui, China

2.School of Materials Science and Technology, Anhui University of Technology, Ma′anshan 243002, Anhui, China

3.School of Materials Science and Technology, Anhui University of Technology, Ma′anshan 243002, Anhui, China

4.School of Materials Science and Technology, Anhui University of Technology, Ma′anshan 243002, Anhui, China

5.School of Nano and Advanced Materials, Changwon National University, Changwon 641-773, Gyeungnam do, Korea

基金项目: 韩国研究项目(KRF-2004-005-D00096) Research Program of Anhui Science and Technology Office(2005KJ030)

Effect of Laser Power on Microstructure and Wear Resistance of WCP/Ni Cermet Coating

Keywords： laser power

Laser cladding nickel-based alloy coating (Ni60) and nickel-based composite coating doped with WC particles by 35% (WCP/Ni) were produced on the low-carbon steel substrate by CO2 continuous wave laser with power of 5 kW using the injected powder technique. The effect of laser power on microstructure and wear resistance of laser cladding WCP/Ni cermet coating was investigated. The WCP/Ni alloy coating with evenly distributed WC ceramic phases and the better bond with the substrate alloy was obtained at a power of 2.2 kW. Diffusion solution reaction happened between WC particles and the substrate alloy during laser cladding, and led to the formation of block rich-tungsten carbide on the edges of the WC particles, especially at higher power. The WCP/Ni alloy coating consists of the undissolved WC particles, the block or dendritic rich-tungsten carbide, the bar-like rich-chromium carbide, and dendrite solid solution and eutectic structure among the carbides. Microhardness and wear resistance of the WCP/Ni coating at different powers were much higher or better than those of Ni60 alloy coating, and the best results were obtained at power of 2.2 kW.

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Effect of Laser Power on Microstructure and Wear Resistance of WCP/Ni Cermet Coating

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