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This work is devoted to experimental research of the influence of technological parameters of plasma-electrolytic modification on the structural-phase condition, also changes in the mechanical and tribological properties of the surface layers of structural steel 0,3Cr-1Mn-1Si-Fe after plasma-electrolytic processing. Metallographic analysis methods using «NEOPHOT-21» and «AXIOPHOT-2» optical microscopes, X-ray diffraction analysis on X'PertPRO and XRD-6000 diffractometers in monochromatic CuKα radiation, as well as elemental analysis on scanning electron microscopes FEIXL-30-FEG and JSM6390-LV, mechanical testing for microhardness on the installation PMT-1M, methods for measuring wear resistance according to the “ball-disk” scheme and corrosion resistance obtained the following results: microstructure of steel 0,3Cr-1Mn-1Si-Fe after nitriding in electrolyte plasma according to mode 1 consist from α-phase and iron nitride (FeN); and mode 2: at a temperature of 700-750oC with a treatment time of 3-7 minutes, a layer consisting of α-Fe, oxides (Fe2O, FeO) and iron FeN nitride and ε- is formed in the electrolyte, which is characterized by ammonium chloride (NH4Cl) content phases (solid solution based on iron nitride Fe3N) with a thickness of 30 μm, which is highly resistant to corrosion. It was determined that after plasma electrolytic nitriding at a temperature of 850 °С for 7 minutes, the wear rate as compared to the initial state of the 0.3Сr-1Mn-1Si-Fe steel samples decreased 4.3 times.
Keywords: Plasma electrolytic nitriding, structural steel, structural and phase condition, wear resistance© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.