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Casting and Foundry
ArticleName Action of protective coatings on surface carbonizing of steel castings
ArticleAuthor E. B. Ten, O. A. Kol
ArticleAuthorData

National University of Science and Technology “MISiS” (Moscow, Russia):

Ten Е. В., Dr. Eng., Prof., e-mail: edis_ten@mail.ru
Kol O. A., Senior Lecturer

Abstract

The surface carbonizing of castings from steel 10Cr18Ni9L during producing in the molds from sand-resin mixtures give rise to decrease of their corrosion resistance. The method of applying the protection coatings on the mold and core surface was used for prevention of surface carbonizing of castings. The efficiency of protection action of the passive (glazing) and active aluminophosphate (AF) and aluminochromphosphate (ACrF) coatings has been examined. All these coatings restrict effectively the surface carbonizing of castings, and the glazing coating has the protection action at the same time owing to forming of the dense low gas-permeable layer on the mold and core surface during glazing melting. And the phosphate (AF and ACrF) coatings not only create the low gas-permeable ceramic layer, but also generate the oxidizing gas atmosphere on the casting and mold contact interface due to phosphates decomposition. Therefore the phosphate coatings restrict the surface carbonizing of steel castings more effectively. It was established that the linear relationship between carbon content in the external layer of castings and the factor of carbonizing ability of gas atmosphere, that has been revealed for the castings without protective coatings, is also valid for the same castings with protective coatings.

keywords Steel, mould, core, castings, gas atmosphere, surface carbonizing, protective coatings, sand-resin mixtures, glazing melting, efficiency of action
References

1. Ten E. B., Kol O. A., Klyuev M. P. Formirovanie pripoverkhnostnoy neodnorodnosti v stalnykh otlivkakh (Formation of surface heterogeneity in steel castings). Liteyshchik Rossii = Russian Foundry Worker. 2010. No. 11. pp. 38–41.
2. Sorokin Yu. I., Mikhaylov A. M., Yakovleva L. A. Nauglerozhivanie stalnykh otlivok v liteynoy forme (Carbonization of steel castings in mold). Izvestiya vuzov. Chernaya metallrugiya = Izvestiya. Ferrous metallurgy. 1972. No. 11. pp. 154–157.
3. Schneider M. J., Chatterjee M. S. Introduction to Surface Hardnening of Steels. ASM International. All right reserved. 2013. pp. 389–398. Available at: www.asminternational.org.
4. Detre R., Maskr K. Kachestvo stalnykh otlivok v svyazi s nitriruyushchim, nauglerozhivayushchim i obezuglerozhivayushchim deystviem formy (Quality of steel castings in connection with nitriding, carbonizing and decarbonizing infl uence of mold). 35 Mezhdunarodnyy kongress liteyshchikov (The 35-th International Congress of Foundry Workers). Moscow: Mashinostroenie, 1972. pp. 61–65.
5. Common defects of furan sand castings and its prevention measures. Special Reports of Suzhou Xingye Materials Technology Co., 2012-3-9. 5 p. Available at: www.chinaxingye.com/en/N_view_76.html.
6. Yukalov I. N. Otlivki iz khimicheski stoykikh splavov (Chemical-resistant alloy castings). Moscow : Mashinostroenie, 1964. 232 p.
7. Surface Treatment for Precipitation-Hardnening Stainless Steels. Journal. NASA SP-5090. Washington, D.C., January, 1968. 13 p.
8. Rajkolhe R., Khan J. G. Defects, Caused and Their Remendies in Casting Process: A Review. International Journal of Research in Advent Technology. 2014. Vol. 2, No. 3. pp. 375–383
9. Zhukovskiy S. S., Anisovich G. A., Davydov N. I. et al. Formovochnye materialy i tekhnologii liteynoy formy: spravochnik (Molding materials and molding technologies: reference book). Under the general editorship of S. S. Zhukovskiy. Moscow : Mashinostroenie, 1993. 432 p.
10. Ten E. B., Kol O. A., Badmazhapova I. B., Klyev M. P. Surface carburization of steel castings. Steel in Translation. 2011. No 1, Vol. 41, Iss 1. pp. 19–22.
11. Tezyka H., Yamano K., Amamiya Y., Katagiri H., Seiko D. Electric Furnace Steel. 1977. Vol. 48, No. 3. pp. 209–215.
12. Baker J. T. Method of casting steel in a shell mold. Patent US, No. 3409069 A. B22C23/00, B22D27/04. Amsted Industries Incorporated. Patented: November 5, 1968. 2 p.
13. Bauman B. V., Ovchinnikov A. V., Perevezentseva O. V. Sposob otbora prob i gazokhromatografi cheskiy analiz gazovoy sredy liteynykh form (Method of sampling and gaschromatographic analysis of gas medium of molds). Zavodskaya laboratoriya = Inorganic materials. 1973. No. 10. p. 1200.
14. Kumanin I. B., Bauman B. V., Ten E. B. Protivoprigarnye pokrytiya i kachestvo poverkhnosti stalnykh otlivok (Non stick coatings and quality of surface of steel castings). Plavka i kristallizatsiya metallov (Smelting and crystallization of metals). Trudy MISiS = Proceedings of National University of Science and Technologies. Moscow : Metallurgiya, 1980. No. 123. pp. 113–122.

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