激光熔覆Fe-Mo-V-C合金涂层组织及摩擦磨损性能

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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 Fe_0.7Mo_0.3, 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 HV_0.2, 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.

Key words： laser cladding Fe-Mo-V-C alloy coatings microstructure frictional wear

Received: 30 October 2019 Published: 19 June 2020

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TG174.44

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	ZHANG Lei
	CHEN Xiaoming
	SU Jianhao
	ZHANG Kai
	CHEN Kuan
	ZHAO Jian

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ZHANG Lei,CHEN Xiaoming,SU Jianhao, et al. Microstructure and frictional wear performance of Fe-Mo-V-C alloy coating prepared by laser cladding[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(1): 65-71.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I1/65

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