Conclusions
It was found that tempering processes are similar in quenched steel and nitrided iron — in the first stage of tempering (20–180°) the martensite with nitrogen transforms, with formation of metastable F16N2 and temper martensite; in the second stage (180–300°) the retained austenite decomposes and the Fe16N2 →Fe4N transformation occurs; in the third stage (300–550°) the number of lattice defects decreases and the Fe4N particles coalesce. After quenching and tempering at 500–600° the alloy consists of a ferrite—nitride mixture of the type of temper sorbite in carbon steel.
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Literature cited
L. I. Lysak and Ya. N. Vovk, "Formation of phase with a cubic lattice during quenching of steels," Fiz. Metal. Metalloved.,19, 5, 669–705 (1965).
Yu. L. Al'shevskii and G. V. Kurdyumov, "The crystal lattice of martensite in manganese steels," Fiz. Metal. Metalloved.,25, 1, 172–174 (1968).
M. V. Belous, Yu. N. Moskalenko, and V. G. Permyakov, "Phase transformations during tempering of quenched alloys in the Fe−N system, Fiz. Metal. Metalloved.,28, 5, 894–902 (1969).
Additional information
Kiev Polytechnical Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 28–30, March, 1974.
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Belous, M.V., Moskalenko, Y.N. & Permyakov, V.G. Phase transformations during tempering of quenched Fe−N alloys. Met Sci Heat Treat 16, 225–226 (1974). https://doi.org/10.1007/BF00663060
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DOI: https://doi.org/10.1007/BF00663060