Аннотация
The present research work is devoted to investigation of various modes of electrolytic-plasma cementation influence on peculiarities of structurally-phase conditions and hardening of constructional steel 30CrMnSi. Scientifically based low-powered and resources-economy type of processing has been selected and leads to stable ferrite-perlites structures formation providing higher mechanical properties. Cementation process was carried out with different modes selection of electrolytic-plasma processing in the electrolyte containing water solution of 10 % of sodium carbonate and 10 % of glycerin. Metallographic analysis with "NEOPHOT-21" microscope application, X-ray analysis on diffractometer X'PertPRO in monochromatic CrKα- radiation, tests for microhardness for device PMT-3 were used in this work as basic methods of research. It is set that microstructure of steel 30CrMnSi samples at different modes of processing consists of a - phases, carbides and retained austenite. Microhardness of the initial sample makes approximately 3000 MPa, and after processing its microhardness makes 6100 MPa that is explained by processing mode. The developed technology of electrolytic-plasma cementation of constructional steels under conditions of the arc discharge in electrolyte is optimal i.e. it provides reliable quality and demanded properties of details working under variable loadings and often exposed to wear, also forming strengthened modified surface coating.