Fretting Wear Properties of Laser-cladded MoNbTaVW Refractory High-entropy Alloy Coatings
DONG Yinghui1,2, CHEN Feihuan3, CAI Zhaobing1,2,3,*, LIN Guangpei1, LU Bingwen4,*, ZHANG Po1,3, GU Le1,2,3
1 Key Laboratory of Metallurgical Equipment and Control Technology, Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China 2 Precision Manufacturing Institute, Wuhan University of Science and Technology, Wuhan 430081, China 3 Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan 430081, China 4 Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651, China
Abstract: The fretting wear properties and fretting wear mechanism of MoNbTaVW refractory high-entropy alloy coatings prepared by laser cladding were studied under different loads (10 N, 20 N, 30 N), different fretting amplitances (50 μm, 150 μm, 250 μm) and different cycles (5 000, 10 000, 15 000). The results show that the prepared MoNbTaVW refractory high-entropy alloy coating is composed of Fe7Ta3-type HCP solid solution phase, FCC solid solution phase and (Fe, Ni) matrix phase, where the FCC phase is unmelted high-entropy alloy powder. According to the range analysis of orthogonal test, the effect of fretting amplitude on the wear volume is the largest, followed by the effect of load, and the effect of cycle number on the wear volume is the least. The wear volume of MoNbTaVW refractory high-entropy alloy coating reaches the maximum under the fretting wear conditions of 15 000 times, 20 N and 250 μm. The effect of load on the friction coefficient is the largest, followed by the amplitude of fretting, and the number of cycles has the smallest effect on the friction coefficient. The friction coefficient of MoNbTaVW refractory high-entropy alloy coating reaches the maximum value under the fretting wear conditions of 10 000 times, 30 N and 150 μm. The fretting wear mechanism of MoNbTaVW refractory high-entropy alloy coating is mainly oxidation wear and adhesive wear. The wear debris generated by fretting wear is mainly Ta- and W-oxides.
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