학술논문
Laser Processing of High-Entropy VNb2 TaCrMoWTi0.3 B0.6 Alloy Coatings for Wear Reduction in Dry Friction with Different Counterfaces
Document Type
Original Paper
Author
Source
Powder Metallurgy and Metal Ceramics. 62(5-6):339-349
Subject
Language
English
ISSN
1068-1302
1573-9066
1573-9066
Abstract
The microstructure, phase composition, and microhardness of the cast high-entropy VNb2 TaCrMoW alloy with the addition of titanium diboride were studied. The initial VNb2 TaCrMoW alloy consisted of two bcc solid solutions, slightly differing in lattice parameters (a = 0.3139 nm and 0.3200 nm). The addition of boron as titanium diboride and repeated remelting led to a bcc solid solution with a larger lattice parameter (a = 0.3217 nm) and a boride with W3.5 Fe2.5 B4 structure (a = 0.6054 nm and c = 0.3256 nm). The bcc solid solution was the first to crystallize, and the boride was part of the eutectic grains and precipitated from the last melt portions, forming a closed network. The resulting alloy was applied to a carbon steel substrate as a coating using electrospark deposition employing an Elitron-24A installation with varying electrical pulse energy. Higher pulse energy during coating deposition increased the layer thickness and surface roughness but did not influence the phase composition. The microstructure of the coatings was more uniform compared to the cast alloys, and X-ray diffraction showed that the coatings contained bcc solid solutions, Fe7 W6 intermetallic compound, and a small amount of TaO2 oxide. The coatings had a hardness of about 10 GPa and were 11–15 μm and 16–20 μm thick at discharge energies of 0.52 and 1.1 J, respectively. A comparative analysis of the phase composition, hardness, and microstructure of the cast alloy and associated coatings was carried out. The coatings deposited at a discharge energy of 0.52 J were subjected to laser processing. Laser processing of the coatings resulted in a thermally affected zone, while the surface layer hardness hardly changed. The wear resistance of the coatings deposited at a discharge energy of 0.52 J was analyzed. Wear resistance testing was conducted for three counterface materials (VK6, Al2 O3 , and Si3 N4 ) in quasistatic and dynamic loading modes. Laser processing of the electrospark coatings changed the wear mechanism and significantly increased the wear resistance regardless of the counterface material and loading mode.