A mathematical model of structural transformations in an alloy steel under the thermal cycle of multipass welding is suggested for computer implementation. The minimum necessary set of parameters for describing the transformations under heating and cooling is determined. Ferritic-pearlitic, bainitic and martensitic transformations under cooling of a steel are considered. A method for deriving the necessary temperature and time parameters of the model from the chemical composition of the steel is described. Published data are used to derive regression models of the temperature ranges and parameters of transformation kinetics in alloy steels. It is shown that the disadvantages of the active visual methods of analysis of the final phase composition of steels are responsible for inaccuracy and mismatch of published data. The hardness of a specimen, which correlates with some other mechanical properties of the material, is chosen as the most objective and reproducible criterion of the final phase composition. The models developed are checked by a comparative analysis of computational results and experimental data on the hardness of 140 alloy steels after cooling at various rates.
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References
V. I. Zyuzin, “Incubation period of isothermal transformation of austenite,” in: Proc. of the Inst. Metallofiz. and Metallurgy [in Russian], UFAN SSSR, Sverdlovsk (1945), Issue 5, pp. 37 – 39.
D. A. Mirzaev, et al., “Kinetic laws of formation of ferrite from austenite in Fe – 9% Cr alloys with different purity with respect interstitial admixtures,” Fiz. Met. Metalloved., 86(6), 90 – 105 (1998).
M. Kh. Shorshorov and V. V. Belov, Phase Transformations and Variation of Properties in Steel under Welding [in Russian], Nauka, Moscow (1972), 219 p.
A. S. Kurkin, E. L. Makarov, and A. B. Kurkin, “Numerical simulation of phase transformations in solution of problems of thermal plasticity,” Svarka Diagn., No. 6, 18 – 23 (2012).
P. Seyffarth and G. Kuscher, Schweiss-ZTU-Schaubilder, Veb Verlag Technik, Berlin (1982), 236 p.
J. Brozda, J. Pilarczyk, and M. Zeman, Spawalnicze Wykresy Przemian Austenitu CTPc-S, Slask, Katowice (1983), 140 p.
L. E. Popova and A. A. Popov, Diagrams of Transformation of Austenite in Steels and Beta-Solutions in Titanium Alloys [in Russian], Metallurgiya, Moscow (1991), 504 p.
O. G. Kasatkin and P. Seyffarth, “Interpolation models for estimating the phase composition of heat-affected zone in arc welding of low-alloy steels,” Avtomat. Svarka, No. 1, 7 – 11 (1984).
D. P. Koistinen and R. E. Marburger, “A general equation prescribing the extent of the austenite-martensite transformation in pure iron-carbon alloys and plain carbon steels,” Acta Metall., No. 7, 59 – 60 (1959).
A. V. Konovalov, A. S. Kurkin, E. L. Makarov et al, The Theory of Welding Processes [in Russian], Izd. MGTU Im. N. E. Baumana (2007), 752 p.
L. A. Efimenko, A. K. Prygaev, and O. Yu. Elagina, Metallurgy and Heat Treatment of Welded Joints [in Russian], Logos, Moscow (2007), 456 p.
G. F. Vander Voort, Atlas of Time-Temperature Diagrams for Irons and Steels, ASM Int. (1991), 766 p.
M. Kh. Shorshorov, The Metallurgy of Welding of Steels and Titanium Alloys [in Russian], Nauka, Moscow (1965), 336 p.
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 2, pp. 60 – 66, February, 2017.
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Kurkin, A.S., Makarov, E.L., Kurkin, A.B. et al. Parameters of Models of Structural Transformations in Alloy Steel Under Welding Thermal Cycle. Met Sci Heat Treat 59, 124–130 (2017). https://doi.org/10.1007/s11041-017-0115-z
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DOI: https://doi.org/10.1007/s11041-017-0115-z