1. Key Laboratory of Research on Hydraulic and Hydro-Power Equipment Surface Engineering Technology of Zhejiang Province, Standard & Quality Control Research Institute Ministry of Water Resources. P. R. C, Hangzhou 310012, China; 2. Water Machinery and Remanufacturing Technology Engineering Laboratory of Zhejiang Province, Hangzhou Machine Design & Research Institute Ministry of Water Resources. P. R. C, Hangzhou 310012, China; 3. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
Abstract：Fe-Mo-V-C alloy coatings were prepared on the 45# steel by laser cladding technique with coaxial powder-feeding. The phase compositions, microstructure and element distribution were characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (DES). In addition, the microhardness and friction and wear property of coatings were tested by Vickers hardness tester and dry sliding friction and wear tester, and the wear mechanism was analyzed. The results show that Fe-Mo-V-C alloy coating prepared by laser cladding is mainly composed of α-Fe and Fe-based alloy, including (α-Fe,Ni), Fe4V and Fe0.7Mo0.3, intermetallic compounds including VC, V8C7, VB and Fe3C, and eutectic phase composed of Fe-based metal and Fe3C. The microtructure of coating is compact and uniform, and the fine and hard particles in the matrix are dispersive, homogeneous and extensive. The average hardness of coating at 1 600 W is as high as 1 020 HV0.2, and its wear resistance is 14 times of the substrate. The dispersion strengthening of VC particles leads to high hardness, and it works as pinning effect and wear-resistant skeleton during the wear process, which greatly improves the wear resistance of Fe-based coating.
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2020, Vol. 25 
