Microstructure and high temperature tribological properties of laser cladding FeCoCrNi-based high-entropy alloy coatings

ZHU Zhengxing; LIU Xiubo; LIU Yifan; MENG Yuan; ZHOU Haibin; ZHANG Shihong

doi:10.11868/j.issn.1001-4381.2022.000620

Cailiao gongcheng (Mar 2023)

Microstructure and high temperature tribological properties of laser cladding FeCoCrNi-based high-entropy alloy coatings

ZHU Zhengxing,
LIU Xiubo,
LIU Yifan,
MENG Yuan,
ZHOU Haibin,
ZHANG Shihong

Affiliations

ZHU Zhengxing: Hunan Province Key Laboratory of Materials Surface/Interface Science & Technology, Central South University of Forestry & Technology, Changsha 410004, China
LIU Xiubo: Hunan Province Key Laboratory of Materials Surface/Interface Science & Technology, Central South University of Forestry & Technology, Changsha 410004, China
LIU Yifan: Hunan Province Key Laboratory of Materials Surface/Interface Science & Technology, Central South University of Forestry & Technology, Changsha 410004, China
MENG Yuan: Hunan Province Key Laboratory of Materials Surface/Interface Science & Technology, Central South University of Forestry & Technology, Changsha 410004, China
ZHOU Haibin: Hunan Province Key Laboratory of Materials Surface/Interface Science & Technology, Central South University of Forestry & Technology, Changsha 410004, China
ZHANG Shihong: Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials(Ministry of Education), Anhui University of Technology, Maanshan 243002, Anhui, China

DOI: https://doi.org/10.11868/j.issn.1001-4381.2022.000620
Journal volume & issue: Vol. 51, no. 3
pp. 78 – 88

Abstract

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High-entropy alloy coatings show great potential for improving the wear resistance of the stainless steel substrate. To investigate the effects of Cu/Si doping on the microstructure and high temperature tribological properties of FeCoCrNi high-entropy alloy coating, FeCoCrNiCux and FeCoCrNiSix series of high-entropy alloy coatings were prepared on the 304 stainless steel by laser cladding.The microstructure and phase distribution of the coatings were characterized by XRD, SEM and EDS, and the high temperature tribological properties of the coatings were tested by a high temperature friction and wear tester. The results show that both FeCoCrNiCux and FeCoCrNiSix high entropy alloy coatings form a single FCC-type solid solution with good metallurgical bonding to the substrate under suitable laser cladding parameters.The addition of Cu reduces the surface hardness of FeCoCrNi coatings, but improves the metallurgical bonding due to the increase of thermal conductivity of the coating; the addition of Si promotes grain refinement and improves the surface hardness of the coating. At 600 ℃, the addition of Cu/Si elements significantly improves the tribological properties of the coating, with the coefficients of friction of 0.24 and 0.19 for FeCoCrNiCu and FeCoCrNiSi coatings, respectively, and the wear rates are 1.58×10-4 mm3·N-1·m-1 and 6.77×10-5 mm3·N-1·m-1, respectively, which are 56.1% and 81.9% lower than FeCoCrNi coating.The main wear mechanisms of FeCoCrNiCu coating are oxidation wear, fatigue wear and slightly abrasive wear, while FeCoCrNiSi coating is oxidation wear.

Published in Cailiao gongcheng

ISSN: 1001-4381 (Print)
Publisher: Journal of Materials Engineering
Country of publisher: China
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: http://jme.biam.ac.cn/CN/1001-4381/home.shtml

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