Surface Hardening of 18CrNi3MoA-SH Steel with Heating in Electrolytic Plasma

Abstract

We investigated 18CrNi3MoA-SH steel, hardened by electrolyte-plasma processing method. Scanning analysis of transient surface demonstrated that in the course of details’ electrolyte-plasma heating chemical surface modification takes place along with tempering. Unit value of micro hardness on the crosscut is estimated. Micro hardness twofold increase concerning initial condition testifies to material hardness after electrolyte-plasma processing. This method advantages are minor energy expenditure in the time of tempering high speeds, possibility of local surface processing especially of large size details with complicated shape. 18CrNi3MoA-SH steel hardening by electrolyte-plasma method is performed on semi-industrial installation constructed at D.Serikbayev EKSTU in collaboration with «TehnoAnalyt» Ltd., Ust-Kamenogorsk. The detail heating temperature is 930 - 9400С, overall time of processing is approximately 5 minutes, hardening is produced at 860 - 8700C then cooled in electrolyte flux. Electrolyte composition is 10 %-s' Na2CO3 and C3H8O3. The metallographic analysis was realized on «NEOPHOT 21» microscope. The qualitative and quantitative phase analysis of steel structure was carried out on PANanalytical" X-Ray diffractometer involving Cu-K radiation. Microhardness determination was measured on PMT-3 device with diamond cutting point; by indentation load 1 N according to State Standard 9450-76.

The Study of the Formation of Ideas of Future Specialists About Tribology

“…In our opinion, to achieve this goal, there is an appropriate scientific research experimental base as part of the center for engineering and tribology and highly qualified personnel with academic degrees and titles, specialists in the field of tribology (Skakov et al, 2012) This work was carried out within the framework of the grant financing project of the Ministry of Education and Science of the Republic of Kazakhstan for 2021-2023 on the topic «Development and implementation of a highly effective technology for applying an anticorrosive coating based on ultrahigh molecular weight polyethylene» (IRN AR092259925 «Development and implementation of a highly effective technology for applying an anticorrosive coating based on ultrahigh molecular weight polyethylene»).…”

Effect of Electrolytic-Plasma Carbonitriding on Structure and Microhardness of Low Carbon Steel 18CrNi3Mo

“…In accordance with the tasks as an object of research we selected low-carbon 18CrN3iMo engineering steel (0.16-0.18% C; 3.3% Ni; 0.9% Cr; 0.51% Mo; 0.44% Mn; 0.34% Si; 0.05% Al; 0.008% S; 0.012% P; 0.015% N; 0.1% O; 0.1% H) General State Standard (GOST) widely used in industry as drill bit drilling tool material. The steel samples were produced by method described in [6,7]. Experimental studies and mechanical tests were performed in laboratory of research Institute "Nanotechnology and New Materials" in Regional University engineering profile laboratory "ІRGETAS" at D.Serikbaev East Kazakhstan State Technical University.…”

“…One of such methods is electrolytic-plasma treatment (EPT). EPT is electrochemical process of surface layer hardening in combination with electric discharge phenomena at the boundary -main electrode -aqueous electrolyte solution [7]. As a result, surface layer is modified by electrolyte ions in electric current holdover, a structure which according to its multifunctional technological characteristics significantly surpasses coatings produced by conventional methods.…”

Phase Composition and Microhardness of Surface Layers 34CrNi1Mo Steel after Electrolytic-Plasma Processing

“…While electrolytic plasma carburization significant difference is achieved in core properties and the surface layer. This results from the fact that at chemical-thermal processing the chemical composition is being changed, that significantly influences physico-mechanical properties of steel details [1][2][3].…”