304不锈钢表面激光熔覆铁基中熵合金涂层组织性能研究

doi:10.11896/cldb.22050201

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Abstract The Fe_63.3Mn₁₄Si_9.1Cr_9.8C_3.8 medium entropy alloy coating was prepared on the surface of 304 stainless steel by laser melting technology. The optimum process parameters of Fe-based medium entropy alloy coating were obtained by orthogonal test design. The microstructure, microhardness and wear resistance and corrosion resistance of the coating were observed and tested. The results show that the optimum parameters are laser power 1 500 W, scanning speed 4 mm/s and spot diameter 4 mm. The Fe_63.3Mn₁₄Si_9.1Cr_9.8C_3.8medium entropy alloy coating is mainly simple FCC phase structure. The average microhardness of the coating is 279HV_0.1, which is about 1.4 times that of the 304 stainless steel matrix 200HV_0.1. In 3.5% NaCl solution, the current density of Fe_63.3Mn₁₄Si_9.1Cr_9.8C_3.8 medium entropy alloy coating is 2.532×10^-6 A·cm^-2, which is one order of magnitude lower compared to 304 stainless steel. The coating shows obvious passivation behavior. Under dry friction conditions, the friction coefficient of the coating is 0.55, which is lower than that of 304 stainless steel, and its wear rate is 6.26×10^-4 mm³/(N·m), which is 34% lower compared to 304 stainless steel. The corrosion resistance of Fe_63.3Mn₁₄Si_9.1Cr_9.8C_3.8 medium entropy alloy coating in 3.5% NaCl solution is better than that of 304 stainless steel, and good wear resistance, which has potential application value.

Key words： laser cladding medium entropy alloy technological parameter corrosion resistance friction and wear resistance

Published: 10 October 2023 Online: 2023-09-28

CLC number:

TG178.1

Fund:National Natural Science Foundation of China (52061027), Zhejiang Provincial Natural Science Foundation (LY23E010002), and Science and Technology Program Project of Gansu Province (22YF7GA155).

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	Articles by authors
	ZHAO Yanchun
	ZHANG Linhao
	SHI Ziqiang
	LI Wensheng
	ZHANG Dong
	KOU Shengzhong

Cite this article:

ZHAO Yanchun,ZHANG Linhao,SHI Ziqiang, et al. Study on the Microstructure and Properties of Fe-based Medium Entropy Alloy Coatings by Laser Melting on 304 Stainless Steel Surfaces[J]. Materials Reports, 2023, 37(19): 22050201-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22050201 OR http://www.mater-rep.com/EN/Y2023/V37/I19/22050201

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