Preparation and properties of laser remelted Ni60/50%WC composite coating

doi:10.13251/j.issn.0254-6051.2021.05.040

Abstract

Abstract: To eliminate defects such as cracks and holes in the Ni60/50%WC composite coating, laser cladding+remelting processing were carried out on the 45 steel surface by using CO₂ laser device. The coating cracks were visualized by using commercial colored flaw detection agent, and the microstructure of coating was analyzed by means of X-ray diffraction (XRD) and scanning electron microscope (SEM/EDS). The microhardness and wear resistance of the coating were examined by micro hardness tester and friction and wear tester. The results show that the laser remelting can achieve the goal of secondary slag discharging, crack healing and surface roughness improvement. The crack-free coating can be obtained by laser cladding with laser power of 3.0 kW, scanning rate of 350 mm/min, overlap rate of 50%, powder feeding rate of 5 g/min, combined with laser remelting with remelting power of 1.5 kW, scanning rate of 300 mm /min, and remelting overlap rate of 50%. Laser remelting can improve the non-uniformity of coating microstructure and enhance the crystallinity and density. Before and after laser remelting, the average microhardness of the composite coating is 740.07 and 700.02 HV0.2, the average friction coefficient is 0.475 and 0.462, and the wear rate is 4.223×10^-15 and 4.874×10^-15 m³/(N·m), in each respectively.

Key words: laser cladding, laser remelting, WC, Ni60, cracks and pores

CLC Number:

TG174.4

Zhang Leitao, Li Haitao, Jia Runnan, Wang Zhe, Fan Shuaiqi, Wang Xuesong, Dai Jiaoyan, Xu Jinfu. Preparation and properties of laser remelted Ni60/50%WC composite coating[J]. Heat Treatment of Metals, 2021, 46(5): 229-234.

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