Improved Wear Resistance of Low Carbon Steel by Duplex Surface Treatment Combining Cathodic Plasma Electrolytic Nitrocarburising and Anodic Plasma Electrolytic Polishing

A technology for duplex plasma treatment of the steel surface is proposed. At the first stage, it is proposed to carry out nitrocarburising at the cathode polarity of the treated sample to harden the surface layer. The composition and structure of nitrocarburised layers have been studied. It is show...

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Bibliographic Details
Published in:Transactions of the Indian Institute of Metals 2023-08, Vol.76 (8), p.2183-2192
Main Authors: Kusmanov, S. A., Tambovskiy, I. V., Mukhacheva, T. L., Kusmanova, I. A., Korableva, S. S., Gorokhov, I. S.
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Coefficient of friction
Corrosion and Coatings
Diffusion layers
Electric contacts
Electric discharges
Electropolishing
Fatigue wear
Friction reduction
High temperature
Iron oxides
Low carbon steels
Materials Science
Metallic Materials
Microhardness
Original Article
Oxidation
Surface layers
Surface roughness
Surface treatment
Tribology
Wear resistance
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Summary:A technology for duplex plasma treatment of the steel surface is proposed. At the first stage, it is proposed to carry out nitrocarburising at the cathode polarity of the treated sample to harden the surface layer. The composition and structure of nitrocarburised layers have been studied. It is shown that as a result of the simultaneous diffusion of nitrogen and carbon, their diffusion coefficients increase, contributing to the achievement of concentrations up to 0.74 ± 0.14% and 0.67 ± 0.18%, respectively, as well as an increase in the microhardness of the surface layer to 1020 ± 20 HV. At the second stage, it is proposed to carry out anodic polishing of the nitrocarburised surface to remove the porous oxide layer with a highly developed relief, which is formed as a result of exposure to the surface of electrical discharges and high-temperature oxidation. Tribological tests have shown a joint positive effect of the hardness of the diffusion layer and low surface roughness, including a dense layer of iron oxides, on a reduction in the friction coefficient by a factor of 2 and weight wear by a factor of 23 during fatigue wear of the treated sample under boundary friction and plastic contact with the counterbody.
ISSN:0972-2815
0975-1645
DOI:10.1007/s12666-023-02921-5