Abstract
The research described in this paper is devoted to short-term anodic nitriding of grade 45 steel with postquenching (nitroquenching) in the aqueous solution of ammonia and ammonia chloride. The modified layer structure, as revealed, is composed of alternate layers: a surface oxide layer composed of FeO and Fe3O4; a layer of dispersed nitrides Fe4N and Fe2–3N with retained austenite; next, a martensitic zone composed of nitrogen and carbon; and the initial nitrogen-enriched ferrite–pearlitic structure. It is found that concentrations of electrolyte components and processing conditions affect the formation character and properties of diffusion layers. The possibility is shown for obtaining a nitroquenched layer 130 µm in thickness with a surface microhardness of to 1200 HV with a decrease in roughness R a from 0.57 to 0.55 µm, R z from 1.75 to 1.62 µm, and R max from 5.74 to 4.00 µm.
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Original Russian Text © S.A. Kusmanov, A.A. Smirnov, P.N. Belkin, 2016, published in Fizikokhimiya Poverkhnosti i Zashchita Materialov, 2016, Vol. 52, No. 1, pp. 105–112.
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Kusmanov, S.A., Smirnov, A.A. & Belkin, P.N. Features of nitroquenching of medium-carbon steel during anodic electrolyte–plasma processing. Prot Met Phys Chem Surf 52, 133–139 (2016). https://doi.org/10.1134/S2070205116010135
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DOI: https://doi.org/10.1134/S2070205116010135