METALLOGRAPHIC STUDIES OF COATINGS OBTAINED BY HF HEATING

To create the most wear-resistant layers of metals for hardening parts operating in an abrasive environment, it takes to apply modern methods. Among them, the application of hardening coatings using boration by high-frequency currents should be considered relevant. (Research purpose) The research purpose is conducting materials science studies of wear-resistant coatings with iron silicide and flux obtained by high-speed boration with high-frequency currents. (Materials and methods) To study the microstructure of the reinforcing coating, templets with a size of 10x10x4 millimeters were cut out of the obtained samples, which were pressed into a tablet with a polymer binder in such a way that the ends of the templet with a cut of the coating were located on the area examined under the microscope. The studies were carried out according to GOST 5640-2020. Various powders of silicides, borides and carbides were used as charge materials for coating. (Results and discussion) A two-layer coating was formed on sample 3 during induction surfacing of the charge. The reinforcing coating on sample 4 has a similar macrostructure, with the difference that the thickness ratio of its layers differs from the previous sample and the pores have a large area. The hardening coating on sample 5 was obtained from a charge with a minimum content of flux powder, a reduced content of boron carbide and a maximum content of cast iron powder. (Conclusions) Studies have established that by adjusting the component and mass composition of the initial charge, the parameters of induction surfacing in the studied Fe-Si-B, Fe-Cr-Si-B systems, it is possible to directly obtain multilayer, predominantly composite and porous reinforcing coatings on the surface of steel 35, and similar structural materials.