Features of Increasing the Wear Resistance of 90CrSi Tool Steel Surface under Various Electrophysical Parameters of Plasma Electrolytic Treatment

Author:

Grigoriev Sergey N.1ORCID,Tambovskiy Ivan V.12,Mukhacheva Tatiana L.12,Kusmanova Irina A.2,Podrabinnik Pavel A.1ORCID,Khmelevsky Nikolay O.13,Suminov Igor V.1,Kusmanov Sergei A.12ORCID

Affiliation:

1. Department of High-Efficiency Processing Technologies, Moscow State University of Technology “STANKIN”, 127994 Moscow, Russia

2. Department of Mathematical and Natural Sciences, Kostroma State University, 156005 Kostroma, Russia

3. Department of Physics, Agrarian University – Moscow Timiryazev Agricultural Academy, 127434 Moscow, Russia

Abstract

The paper investigates the feasibility of plasma electrolytic treatment (PET) of 90CrSi tool steel to enhance hardness and wear resistance. The influence of electrophysical parameters of PET (polarity of the active electrode, chemical-thermal treatment, and polishing modes) on the composition, structure, morphology, and tribological properties of the surface was studied. Tribological tests were carried out under dry friction conditions according to the shaft-bushing scheme with fixation of the friction coefficient and temperature in the friction contact zone, measurements of surface microgeometry parameters, morphological analysis of friction tracks, and weight wear. The formation of a surface hardened to 1110–1120 HV due to the formation of quenched martensite is shown. Features of nitrogen diffusion during anodic PET and cathodic PET were revealed, and diffusion coefficients were calculated. The wear resistance of the surface of 90CrSi steel increased by 5–9 times after anodic PET followed by polishing, by 16 times after cathodic PET, and up to 32 times after subsequent polishing. It is shown that in all cases, the violation of frictional bonds occurs through the plastic displacement of the material, and the wear mechanism is fatigue wear during dry friction and plastic contact.

Funder

Ministry of Science and Higher Education of the Russian Federation

Ministry of Higher Education of the Russian Federation

Publisher

MDPI AG

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