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摘要
To improve the mechanical properties of the FeCoNiCr series high-entropy alloy cladding layer, FeCoNiCr0.5B high-entropy alloy coatings are prepared on the surface of 20 steel using magnetic field-assisted plasma cladding technology. The effects of the applied magnetic field on the microstructure and phase structure of the high-entropy alloy coating are analyzed by scanning electron microscopy(SEM), optical microscope(OM), X-ray diffraction(XRD), and the wear resistance and microhardness distribution of the coatings are tested by Vickers hardness tester and friction wear tester. The results show that the microstructure of FeCoNiCr0.5B high-entropy alloy coating is composed of face-centered cubic(FCC)phase and M3B phases, and the applied magnetic field does not change the physical phase type. The average grain size of the coating is reduced from 18.64 μm to 15.93 μm under the effect of magnetic field assistance, and the mechanical properties of the molten layer are significantly improved. When the magnetic field strength is 45 mT, the average microhardness of the coating reaches 708.84 HV, which is 19.5% higher than the average hardness of the coating without magnetic field assistance; meanwhile, the wear quality of the coating reaches the minimum, the minimum wear weight loss is only 6 mg, which is 40.8% of the weight loss of the coating without magnetic field assistance, the average friction coefficient is reduced from 0.64 to 0.42, and the main wear form of the coating is changed from adhesive wear to abrasive wear. The results are not only conducive to the improvement of the relevant theory of plasma cladding high-entropy alloys with external magnetic fields, but also provide a feasible solution for the improvement of the properties of FeCoNiCr0.5B high-entropy alloys. ? 2022 Editorial Office of Chinese Journal of Mechanical Engineering.
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