Effects of Nano-CeO2 Doping on Microstructure and Wear Performance of Laser clad Fe/Cr3C2Alloy Composite Coating
XIAO Yi1,2, GU Jianfeng1, ZHANG Junxi3, YANG Youli1
1 School of Mechanical Engineering, Nantong Vocational University, Nantong 226007; 2 State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200072; 3 Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai 200090
Abstract: The effects of 1% nano-CeO2 doping to the organizational structure and wear resistance of Fe/Cr3C2 composite coatings formed by using laser cladding on low-carbon steel surface has been researched in this paper with the aid of SEM, EDS, XRD, micro-hardness tester and sliding wearing test. Experimental results demonstrated that compound phases such as α-Fe, γ-Fe, Cr3C2, Cr23C6, Cr7C3, etc. are the main constituent phases of Fe+Cr3C2+1%CeO2 composite coatings. Composite coatings’ micro-structures were refined obviously after adding 1% nano-CeO2, and the quantities of non-cladding Cr3C2 reduced significantly, as well as the primary carbides transformed from coarse rod to block with risen quantity and uniform distribution, which effectively restrained and eliminated crack formation. The hardnesses and wear resistances of the Fe+Cr3C2+1%CeO2composite coatings were improved significantly, and in particular, the cross-sectional micro-hardness of Fe+30%Cr3C2+1%CeO2 coating was 105HV higher than that of Fe+30% Cr3C2 coating (increased by 15.4%). Meanwhile, the hardness distribution homogeneities of the doped coatings along depth direction gets improved apparently.
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2017, Vol. 31 
