Effect of Mn Content on High-temperature Tribological Properties of Laser Cladding FeCoCrNiMnx High-entropy Alloy Coatings
XIE Xiaoming1, SHEN Ying2, LIU Xiubo1,*, ZHU Zhengxing1, LI Mingxi3,*
1 Hunan Province Key Laboratory of Materials Surface/Interface Science & Technology, Central South University of Forestry & Technology, Changsha 410004, China 2 School of Aeronautics and Astronautics, Nanchang Institute of Technology, Nanchang 330044, China 3 Agriculture Equipment Institute of Hunan, Changsha 410125, China
Abstract: High-entropy alloy coatings have great potentialability to improve the wear-resistant and friction-reducing properties of steel substrates. In order to investigate the effects of different Mn contents on the high-temperature tribological properties of laser-cladding-coated FeCoCrNiMnx high-entropy alloy coatings, five high-entropy alloy coatings of FeCoCrNiMnx (x=0, 0.25, 0.5, 0.75, 1.0) were successfully prepared on the surface of Q235 steel using laser cladding technology. The phase composition, micro-morphology and high-temperature tribological properties of five coa-tings were systematically analyzed by characterization and performance testing methods, such as XRD, SEM, EDS and high-temperature friction-wear testing, then their wear-resistant and friction-reducing mechanisms at high temperatures were discussed. The results show that all five high-entropy alloys formed simple solid solution phases and no complex phases were generated. Compared to Q235 steel, five coatings have significantly improved wear and friction reduction properties at high temperature. The average friction coefficients of coatings decrease firstly and then increase with the increasing of Mn content, but the average friction coefficients of all coatings containing Mn element were lower than that without Mn element. To high temperature wear resistance, five coatings' wear rates showed an overall decreasing trend with increasing of Mn content. Among 5 kinds of coatings with Mn element, the one with x=1 got the lowest wear rate of 2.71×10-4 mm3/(N·m), which is reduced by 61.2% and 33.9% compared to substrate and the coating without Mn element, respectively, and the wear mechanisms of five coatings at high temperature are dominated by abrasive wear and oxidative wear.
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2024, Vol. 38 
