PECULIARITIES OF PROCESSES OF CARBIDE FORMATION AND DISTRIBUTION OF Cr, Mn AND Ni IN WHITE CAST IRONS
Abstract
During crystallization of castings from white cast iron, carbides Me3С, Me7С3, Me23С6 were formed depending on chromium and carbon content. Impeded chromium diffusion caused formation of thermodynamically unstable and non-uniform phases (carbides). During heat treatment process stable equilibrium phases were formed as a result of rearrangement of the carbides’ crystal lattice, replacement of iron, manganese, nickel and silicon atoms by chromium atoms. The allocated atoms concentrated, forming inclusions of austenite inside the carbides. Holding during 9 hours at 720 °С and annealing decreased the non-uniformity of chromium distribution in the metallic base of cast iron containing 11,5 % Cr, and increased it in the cast iron containing 21,5 % Cr. Holding during 4.5 hours at 1050 °С and normalization decreased the non-uniformity of chromium distribution in the metallic base of cast iron containing 21,5 % Cr, and increased it in cast iron containing 11,5 % Cr.
About the Author
V. V. Netrebko
Zaporizhzhya National Technical University
Ukraine
Ukraine
Netrebko Valeriy, Ph. D in Engineering, Associate Professor Dep. «Equipment and Technology of Welding Production», Zaporozhskiy National Technical University, 64, Zhukovsky str., Zaporozhie, 69063, Ukraine, tel. +38 (050-486-27-40). Е-mail: olgavvn@mail.ru, ORCID: 0000–0003–3283–0116.
References
1. Garber M. Ye. Iznosostoykie belye chuguny [Wear resistant white cast irons]. Moscow, Mashinostroenie Publ., 2010. 280 p.
2. Garost A. I. Zhelezouglerodistye splavy [Iron-carbon alloys]. Minsk, Belaruskaya navuka Publ., 2010. 252 p.
3. Kirillov A. A., Belov V. D., Rozhkova Ye. V. and oth. Strukturno i nestrukturno chuvstvitelnye svoystva khromistykh chugunov [Structurally and non-structurally susceptible properties of chromium cast irons]. Chernye metally – Ferrous metals, 2007, no. 9, pp. 7–13.
4. Tsypin I. I. Belye iznosostoykie chuguny. Struktura i svoystva [White wear resistant cast irons. Structure and properties], Moscow, Metallurgiya Publ., 1983. 176 p.
5. Cheylyak h A. P. Ekonomnolegirovannye metastabilnye splavy i uprochnyayushchie tekhnologii [Sparingly alloyed metastable alloys and strengthening technologies]. Kharkov, NNTs KhFTI Publ., 2003. 212 p.
6. Kopyciński D., Kawalec M., Szczęsny A., Gilewski R., Piasny S. Analysis of the Structure and Abrasive Wear Resistance of White Cast Iron With Precipitates of Carbides. Archives of Metallurgy and Materials. Institute of metallurgy and materials science of Polish academy of sciences, 2013, vol. 58, issue 3, pp. 973–976.
7. Gierek A., Bajka L. Zeliwo stopowe jako tworzywo konstrukcyjne [Cast iron as a structural material for alloys]. Katowice, Slask Publ., 1976. 230 р.
8. Gudremon E. Spetsialnye stali [Special Steels]. Moscow, Metallurgiya Publ., 1966. Vol. 1, 736 p.
9. Zhukov A. A. Psevdogeksagonalnyy karbid Fe7C3 i evtektika Fe3C-Fe7C3 v sisteme Fe-C [Pseudohexagonal carbide Fe7C3 and eutectic Fe3C-Fe7C3 in the Fe-C system]. Izvestiya Akademii nauk SSSR. Metally – News of the USSR Science Academy. Metals, 1973, no.1, pp.181–183.
10. Volchok I. P., Netrebko V. V. Osobennosti legirovaniya margantsem iznosostoykikh vysokokhromistykh chugunov [Peculiarities of alloying of high-chromium cast irons with manganese]. Litye i metallurgiya – Foundry Production and metallurgy, 2012, no. 3, pp. 162–165.
11. Belikov S., Volchok I., Netrebko V. Manganese influence on chromium distribution in high-chromium cast iron. Archives of Metallurgy and Materials. Institute of metallurgy and materials science of Polish academy of sciences, 2013, vol. 58, issue 3, pp. 895–897.
12. Bunin K. P., Malinochka Y a. N., Taran Yu. N. Osnovy metallografii chuguna [Metallography foundations]. Moscow, Metallurgiya Publ., 1969. 416 p.
13. Kosolapova T. Ya. Karbidy [Carbides]. Moscow, Metallurgiya Publ., 1968. 300 p.
14. Kutsova V. Z., Kovzel M. A., Hrebenieva A. V., Velychko O. O. Vplyv izotermichnoho hartuvannia na fazovyi sklad biloho vysokokhromystoho chavunu 28X32H3Ф [Influence of isothermal hardening on the phase composition of white high-chromium cast iron 28Х32Н3Ф]. Dnipropetrovsk, PSАES Publ., 2012, issue 64, pp. 81–87.
15. Netrebko V. V., Volchok I. P. Osobennosti legirovaniya chromium iznosostoykikh chugunov [Peculiarities of alloying of cast irons with chromium]. Litye i metallurgiya – Foundry Production and metallurgy, 2013, no. 3, pp. 75–78.
16. Netrebko V. V. Osobennosti raspredeleniya khroma v vysokokhromistykh chugunakh [Peculiarities of chromium distribution in high-chromium cast irons], Dnipropetrovsk, PSАES Publ., 2013, issue 65, pp. 346–349.
Review
For citations:
Netrebko V.V. PECULIARITIES OF PROCESSES OF CARBIDE FORMATION AND DISTRIBUTION OF Cr, Mn AND Ni IN WHITE CAST IRONS. Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY). 2015;(3):40-46. (In Russ.)
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