Abstract
To determine the best heat treatment of steel, thermokinetic diagrams of austenite decomposition are required. Experimental determination of those diagrams is extremely difficult. In the present work, a model of the phase transitions is proposed; the model takes account of the structure of powder steel. A method is developed for computer experiments with steel cooling. The proposed model permits the determination of the kinetic parameters of austenite decomposition on the basis of isothermal diagrams for two values of the steel porosity. By that means, the transformation kinetics in this steel may be predicted for other values of the porosity, both in isothermal conditions and in continuous cooling. The model is verified for У8 and ПК80 steel with different porosity, by means of published experimental data.
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Kisino, T., Nagaki, S., and Inoue, T., Phase transformations, thermal conductions and elasto-plastic stress in hardening of steel, Materials, 1979, vol. 28, no. 312, pp. 861–867.
Mirzaev, D.A., Okishev, K.Yu., Schastlivtsev, V.M., Mirzoev, A.A., Yakovleva, I.L., and Karzunov, S.E., Kinetics of ferrite formation from austenite in Fe9% Cr alloys with various concentrations of interstitial impurities, Phys. Met. Metallogr., 1998, vol. 86, no. 6, pp. 590–600.
Okishev, K.Yu., Nucleation site saturation and kinetic parameters of austenite-ferrite transformation in Fe–9% Cr alloys, Vestn. Yuzh.-Ural. Gos. Univ., Ser.: Metall., 2012, no. 15 (274), pp. 116–121.
Tkachenko, I.F. and Tkachenko, K.I., On kinetics of initial stage of the pearlite transformation into nonalloy steel, Izv. Vyssh. Uchebn. Zaved., Chern. Metall., 2003, no. 4, pp. 43–45.
Christian, J.W., The Theory of Transformations in Metals and Alloys, New York: Pergamon, 1965.
Gurevich, Yu.G., Ivashko, A.G., and Tsyganova, M.S., Mathematical modeling of austenite decomposition to calculate the thermokinetic diagram, Izv. Vyssh. Uchebn. Zaved., Chern. Metall., 2004, no. 9, pp. 45–48.
Gurevich, Yu.G. and Tsyganova, M.S., Isothermal and thermokinetic diagrams of powder steels of different porosity, Steel Transl., 2006, vol. 36, no. 1, pp. 74–78.
Ivashko, A.G., Tsyganova, M.S., and Polishchuk, I.N., Computer modeling of phase transformations during thermal treatment, Vestn. Tyumen. Gos. Univ., 2008, no. 6, pp. 129–140.
Gurevich, Yu.G., Antsiferov, V.N., Bulanov, V.Ya., and Ivashko, A.G., Termokineticheskie i izometricheskie diagrammy poroshkovykh stalei: Spravochnik (Thermokinetic and Isothermal Diagrams of Powder Steels: Handbook), Gurevich, Yu.G., Ed., Yekaterinburg: UrO, Ross. Akad. Nauk, 2001.
Ermakov, S.S. and Vyaznikov, N.F., Poroshkovye stali i izdeliya (Powder Steels and Products), Leningrad: Mashinostroenie, 1990.
Antsiferov, V.N., Bulanov, V.Ya., Bogodukhov, S.I., and Grevnov, L.M., Termokhimicheskaya obrabotka poroshkovykh stalei (Thermochemical Treatment of Powder Steels), Yekaterinburg: UrO, Ross. Akad. Nauk, 1997.
Antsiferov, V.N., Bobrova, S.N., Perel’man, O.M., and Shatsov, A.A., Isothermal decomposition of austenite in powered nickel-molybdenum steel, Met. Sci. Heat Treat., 1993, vol. 35, no. 8, pp. 450–454.
Taha, H.A., Operations Research: An Introduction, New Jersey: Paerson Education, 2003.
Gurevich, Yu.G. and Ivashko, A.G., Kinetika raspada pereokhlazhdennogo austenita poroshkovykh stalei (Kinetics of Decomposition of Supercooled Austenite of Powder Steels), Kurgan: Kurgan. Gos. Univ., 1998.
Bunday, B.D., Basic Optimization Methods, London: Edward Arnold, 1984.
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Original Russian Text © A.G. Ivashko, M.S. Tsyganova, R.I. Nabatov, 2016, published in Izvestiya VUZ. Chernaya Metallurgiya, 2016, No. 3, pp. 191–196.
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Ivashko, A.G., Tsyganova, M.S. & Nabatov, R.I. Decomposition kinetics of supercooled austenite in porous powder steel. Steel Transl. 46, 196–200 (2016). https://doi.org/10.3103/S0967091216030062
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DOI: https://doi.org/10.3103/S0967091216030062