Conclusions
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1.
A method for the thermodynamic and kinetic analysis of processes of internal oxidation and the transformation of alloying elements during the carbonitriding of steels is developed.
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2.
Manganese, molybdenum, and tungsten do not form independent carbides and nitrides, and may enter into the composition of complex cementite-base carbonitrides. The formation of chronium and titanium nitrides is possible in the carbonitrided layer.
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3.
The formation of complex spinel-type oxides is possible in steels during carbonitriding as a result of internal oxidation of the alloying elements. The thickness of the internal oxidized layer is 2–20 μm. Alloying of steels with tungsten and molybdenum makes it possible to inhibit the internal-oxidation process.
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 54–58, May, 1985.
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Lakhtin, Y.M., Kogan, Y.D. & Solodkin, G.A. Internal oxidation and transformation of compounds of alloying elements in steel subjected to carbonitriding. Met Sci Heat Treat 27, 380–386 (1985). https://doi.org/10.1007/BF00693381
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DOI: https://doi.org/10.1007/BF00693381