Conclusions
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1.
A new morphological variety of sulfides was found, formed due to cocrystallization of sulfides and graphite, separate sections of such "complex platelets" consisting of almost pure sulfide.
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2.
In the center of complex biphase sulfides we found a phase intermediate in composition between manganese [(Mn,Fe)S] and iron [(Fe,Mn)S] sulfides.
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3.
Slow cooling of cast iron during solidification promotes the growth of long sulfide inclusions in the form of "eutectic dendrites" and clusters of them.
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Literature cited
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C. Sims and F. Dahle, Trans. Am. Foundrymen's Soc.,46, 65 (1938).
K. I. Bunin, Ya. N. Malinochka, and Yu. N. Taran, Basic Metallography of Cast Iron [in Russian], Metallurgiya, Moscow (1969).
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H. Morrogh, J. Iron Steel Inst.,143, 207 (1941).
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Additional information
Moscow Automobile Factory Higher Technical School. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 32–35, May, 1977.