Way of Hardening Surface Coating of Details from Steel 30CrMnSi in Electrolytic Plasma

Abstract

The present work is devoted research of influence of various modes of electrolytic-plasma cementation on feature of change a structurally-phase conditions and hardening of a constructional steel 30CrMnSi. It is chosen scientifically proved low-power and resources-economy a processing kind which leads to formation stable ferrite-perlites structures, provides higher mechanical properties. Cementation process carried out with selection of different modes of electrolytic-plasma processing in the electrolyte containing water solution of 10 % of sodium carbonate and 10 % of glycerin. As the basic methods of research in work we used metallographic the analysis with microscope application «NEOPHOT-21», X-ray analysis on diffractometer Х’PertPRO in monochromatic CrKα - radiation, tests for microhardness for device PMT-3. It is established that a microstructure of samples steel 30CrMnSi at different modes of processing consist from α - phases, particle carbides. Microhardness of the initial sample makes approximately 3000 МPа, and after processing its microhardness makes 6100 МPа that speaks about of a processing mode. The developed technology of electrolytic-plasma cementation of constructional steels in the conditions of the arc category in electrolyte is the optimal as provides reliable quality and demanded properties of details, working in variable loadings and often exposed to wear, forms the strengthened, modified surface coating.

Plasma Electrolytic Cementation of 0.3C-1Cr-1Mn-1Si-Fe Steel

“…Approximately 65% of the bulk of the studied steel is occupied by pearlite grains. The average grain size of perlite is about 12.7 µm, and the average grain size of ferrite turned out to be somewhat smaller and amounted to 9.4 µm [9].…”

Functional Surface Layer Strengthening and Wear Resistance Increasing of a Low Carbon Steel by Electrolytic-Plasma Processing

“…It is stated that electrolyte-plasma processing requires low power (within 3 kWh) when rapid motion occurs. The obtained data are used in [17].…”

Change of Structure and Mechanical Properties of R6M5 Steel Surface Layer at Electrolytic-Plasma Nitriding

“…Electrolytic-plasma processing of samples was carried out at the experimental industrial installation having the following main parts: electrolytic cell, power supply, automatic control system, electrolyte cooling system, electrolyte supply system [8]. The process carried out in an water electrolyte solution containing 20% carbamide, 10% sodium carbonate with active cathode in following mode: the sample heating temperature varied from 450°C to 550°C, processing time varied from 3 to 9 min.…”