Conclusions
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1.
A method is proposed for surface hardening of austenitic steels (N27T3, N21T3M2, and others) that includes stabilization of austenite throughout the entire piece due to aging, destabilization of the surface layer by heating with high-frequency current, the martensitic transformation in the surface layer during cooling of the piece to temperatures between MS of the surface layer and MS of the core, and aging of the martensite.
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2.
This treatment produced a hardened layer 4 mm thick with a hardness of HRC 48 on austenitic steel N21T3M2.
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Literature cited
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Additional information
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 8, pp. 7–10, August, 1977.
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Sagaradze, V.V., Malyshev, K.A., Shchedrin, E.I. et al. Surface hardening of austenitic steels. Met Sci Heat Treat 19, 646–648 (1977). https://doi.org/10.1007/BF00673850
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DOI: https://doi.org/10.1007/BF00673850