Conclusions
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1.
Oxide films formed on the surface of Mn−Al steels during heating in a weakly oxidizing atmosphere can be used for local protection of surfaces not to be nitrided.
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2.
Heating in spent carburizer or pyrolized gas at 650–750° for 3–12 h produces a dense oxide film impenetrable to atomic nitrogen on the surface of high-manganese austenitic steels with 1.50–3.8% Al.
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Literature cited
E. V. Trunina et al., “Nitriding of austenitic steels,” in: Technology, Organization, and Mechanization of Processes in Heat and Chemicothermal Treatments [in Russian], NIIINFORMTYaZhMASh, Moscow, No. 13-68-4 (1968), p. 2.
B. Chalmers, Physical Metallurgy [Russian translation], Metallurgizdat, Moscow (1963), p. 449.
Additional information
A. A. Baikov Institute of Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 8, pp. 6–9, August, 1975.
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Rudman, V.A., Blinov, V.M. Local protection of Mn − Al austenitic steels against nitriding. Met Sci Heat Treat 17, 645–647 (1975). https://doi.org/10.1007/BF00664306
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DOI: https://doi.org/10.1007/BF00664306