CREATION OF WEAR-RESISTANT COATINGS ON STEEL 35 BY THE METHOD OF ELECTROSPARK ALLOYING WITH POWDER OBTAINED BY ELECTROEROSIVE DISPERSION OF T5K10 CARD ALLOY

10.25712/ASTU.1811-1416.2024.01.011

Abstract

In the work, by electroerosive dispersion of the T5K10 alloy in oil, a powder was obtained, which was applied to workpieces made of steel 35 by the method of electric spark alloying with a non-localized electrode, the composition, structure and properties of the resulting coatings were studied. The chemical and phase compositions and microstructure of the resulting particles were determined. It has been established that during electroerosive dispersion in the resulting powder particles, complete dissolution of the original tungsten carbide in cubic carbide (Ti,W)C occurs. Studies of the kinetics of mass transfer during electric spark alloying with a non-localized electrode have shown that the resulting powder is deposited together with steel granules at a rate of 1.9-2.6 mg/(cm²×min). The resulting coatings consist of tungsten-containing and iron-containing phases, the elements of which are evenly distributed throughout the depth of the coating. The concentration of the elements W, Ti, Co in coatings depends on the ratio of the masses of the powder and steel granules in the applied powder. Tests have shown that, due to the high concentration of alloying elements in the coatings, they have high hardness (6.4 GPa-9.2 GPa) and a reduced wear rate (0.13×10⁵-0.39×10⁵ mm³/Nm) compared to the original steel 35 (2.6 GPa and 2.47×10⁵-2.65×10⁵ mm³/Nm, respectively).