Conclusions
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1.
The aluminum coating on cast iron, as on steel [1, 2], consists of two zones — a light gray surface zone and light transition zone.
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2.
The transition (light) zone has a high hardness due to hardening of α phase by silicon.
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3.
The transition zone contains, along with FeAl and the α solid solution, Fe3AlC3, which evidently also increases the hardness of the transition zone.
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Literature cited
I. N. Kidin et al. "Structure and phase composition of aluminum coatings," Metal. i Term. Obrabotka Metal., No. 2, 7–11 (1971).
A. N. Minkevich, Chemicothermal Treatment of Metals and Alloys [in Russian], Mashinostroenie, Moscow (1965).
S. S. Gorelik, L. N. Rastorguev, and Yu. A. Skakov, X-Ray and Electron-Optical Analysis (Supplement) [in Russian], Metallurgiya, Moscow (1970).
Additional information
Rybinsk Motor Construction Factory. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 9, pp. 71–72, September, 1973.
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Zhukov, A.A., Gladkov, V.A., Bronnikova, T.A. et al. Structure and composition of aluminum coatings on cast iron. Met Sci Heat Treat 15, 809–811 (1973). https://doi.org/10.1007/BF00656301
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DOI: https://doi.org/10.1007/BF00656301