Conclusions
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1.
In piles manufactured by the centrifugal method in molds lined with a sand-resin mixture the depth of the dendritic zone is 1–3.5 mm; with increasing cooling rates this depth increases, and this increases the strength of cast iron rings.
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2.
Annealing of cast iron of the given composition at 500–830°C for more than 1h decreases the depth of the dendritic zone.
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3.
Injection of ammonia increases the depth of the dendritic zone and increases the strength of cast iron castings.
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Literature cited
I. N. Bogachev, Metallography of Cast Iron [in Russian], Metallurgizdat, Moscow (1962).
I. N. Bogachev and I. N. Berenova, Zavodskaya laboratoriya, No. 6 (1951).
I. N. Bogachev, T. S. Davydov, and S. G. Rozhkov, Graphitization and Heat Treatment of White Cast Iron [in Russian], Mashinostroenie, Moscow (1964).
É. Ya. Khrapkovskii, Structure and Strength of Thin Walled Castings of Gray Cast Iron [in Russian], Mashinostroenie, Moscow (1965).
P. I. Levi, Nitrogen in Cast Iron Castings [in Russian], Mashinostroenie, Moscow (1964).
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 4, pp. 63–65, April, 1966