Conclusions
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1.
Dilatometric curves obtained at 800–1000° were analyzed and also the kinetics of graphitization of cast irons with 0.03–0.28% sulfur (excess sulfur not combined with manganese).
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2.
It was found that the activation energy of graphitization Qε is minimal in the first moments for cast irons with −0.03% ΔS. For all the cast irons investigated the value of Qε decreases with graphitizing time. With a change of ΔS from 0.03 to 0.11% the initial values of Qε increase, and with 0.28% ΔS the final values of Qε increase.
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Literature cited
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M. A. Krishtal and É. G. Titenskii, Properties of Malleable Cast Iron [in Russian], Metallurgiya, Moscow (1967).
R. M. Kahn (Editor), Physical Metallurgy [Russian translation], Mir (1968).
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A. P. Lyubchenko et al., "Microrelief of graphite grains and microdistribution of sulfur (S35) in malleable cast irons," Fiz. Metal. Metalloved., 5 (26) 846 (1968).
K. P. Bunin, Ya. N. Malinochka, and Yu. N. Taran, Fundamentals of Metallography of Cast Iron [in Russian], Metallurgiya, Moscow (1969).
Additional information
V. A. Malyshev Khar'kov Factory of Transportation Machine Construction. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 54–57, March, 1974.
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Lyubchenko, A.P., Tsarina, I.V. & Sherman, D.G. Dilatometric study of graphitization in malleable cast iron with sulfur. Met Sci Heat Treat 16, 252–255 (1974). https://doi.org/10.1007/BF00663068
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DOI: https://doi.org/10.1007/BF00663068