Microstructure and properties of Al0.1CoCrFeNi high entropy alloy coating fabricated by laser cladding

doi:10.13251/j.issn.0254-6051.2020.12.031

Abstract

Abstract: Al_0.1CoCrFeNi high-entropy alloy coating on the surface of H13 steel was prepared by using laser cladding technology. The results show that the structure of Al_0.1CoCrFeNi high-entropy alloy coating is single phase FCC type, showing as columnar grains at the junction of coating and substrate steel, while as equiaxed grains in other regions; and the maximum microhardness on the coating section is up to 560.2 HV0.5, which is about 2.5 times of that of the substrate. The coating exhibits better thermal shock resistance than that of the substrate. No cracks are found in the coating after thermal shocking at 600 ℃ and 800 ℃ for 50 cycles, but when undergone 7 cycles at a high temperature of 1000 ℃, the steel substrate is broken while there is no obvious cracks in the coating and the junction zone of coating and substrate. Both the friction coefficient and wear rate of the coating are lower than that of the substrate, which indicates oxidation wear is the main wear mechanism for the coating, while the substrate steel shows mixed mechanisms of oxidation wear and fatigue wear.

Key words: high entropy alloy coating, microstructure, thermal shock resistance, wear resistance

CLC Number:

TG146.6

Fan Jiacheng, Liu Ning, Zhou Huiling, Zhang Xinghua, Niu Muye, Chang Haobo, Geng Yifan. Microstructure and properties of Al_0.1CoCrFeNi high entropy alloy coating fabricated by laser cladding[J]. Heat Treatment of Metals, 2020, 45(12): 155-159.

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Microstructure and properties of Al_0.1CoCrFeNi high entropy alloy coating fabricated by laser cladding

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