ANALYSIS OF THE TECHNOLOGICAL POSSIBILITY OF MANAGING THE ROUGHNESS PARAMETERS OF STAINLESS STEELS IN THE PROCESS OF JET COMBINED ELECTROLYTIC-PLASMA TREATMENT

This article discusses the technological possibility of controlling surface roughness parameters in a wide range of values, from processing surfaces made in the preparation operations to finishing at the nanoscale. The studies used samples made of 20Kh13, 08Kh18N9T, AISI 304, AISI 310, materials obtained by SLM technology, AISI 316L steel, and nickel-based heat-resistant alloys such as EP648 and Inconel 718. It was shown that the processing involves a sequential combination of focused electrolyte plasma jet processing followed by focused glow discharge plasma finishing. It has been shown that pre-treatment can reduce the roughness parameter from Ra 80 μm to Ra 0.2 μm for various stainless steels and alloys produced by SLM technology, while finishing can reduce the roughness parameter from Ra 0.2 to Ra 0.004 μm, as is the case for 08X18N9T stainless steel. Atomic force microscopy shows that the surface of stainless-steel samples after jet electrolyte-plasma treatment has an average surface height of Sa 11.713 nm at 2499.515 μm2. The results of these studies can be used for surface treatment of stainless steels and alloys in medicine and other fields.