| Название |
Effect of niobium addition on the structural-phase composition, mechanical and special properties of cast irons based on the Cr–Mn–Ni–Ti system |
| Реферат |
The data on changes of the phase composition, the formation of alloys structure, oxide layers, the distribution of elements between the structural components of the alloy and the oxidation surface, the depth of oxide and sub oxide layers, wear resistance, scale resistance, expansion resistance and mechanical properties of Cr–Mn–Ni–Ti cast iron depending on the different content of niobium and the heat-storage capacity of the mold are presented. Alloying of white cast iron with niobium leads to formation of complex (Nb,Ti)C carbides. These carbides have low coagulation rate and possessing thermal stability. They are able to retain the alloys mechanical properties at high temperatures for a long time, what leads to the increase in heat and wear resistance. The quantitative metallographic analysis of carbides (Nb,Ti)C and complex carbides (Cr,Fe,Mn)7C3 was carried out on the studied compositions samples. The structure and properties of niobium alloyed cast irons have been studied, after the tests for scale stability. Using micro-X-ray spectral analysis, it was determined that the chemical composition and structure of oxide films depend on the distribution of alloying elements between the structural components of the alloy. The distribution of elements along the depth of oxide layers has been studied in alloys with a content of niobium of 1.5%. The average manganese content in the film is 30%, chromium is 19%, this oxide film has protective properties, the scale resistance of cast iron alloyed with 1.5% Nb is equaled to 0.035–0.055 g/(m2·h), depending on the type of the mold. When the niobium and chromium of cast irons are alloyed together, the metal hardens in the form, which ensures the stability of the cast iron structure under operating conditions at elevated temperatures. The cast iron with 1.5% Nb has the best special properties, the wear resistance of this iron has increased by 1.2 times in comparison with niobium-free cast iron, and the scale resistance is equaled to 1.7–2.0 times, the growth is of 0.0–0.09%. |
| Библиографический список |
1. Zhukov А. А., Silman G. I., Froltsov М. S. Wear-resistant castings from complex-alloyed white cast irons. Moscow: Mashinostroenie, 1984. 104 p.
2. Ree E. H, Ree Hosen, Kolokoltsev V. M., Petrochenko E. V. et. al. Complex-alloyed white functional cast irons in cast and heat-treated states. Vladivostok: Dalnauka, 2006. 275 p.
3. Tsypin I. I. White wear-resistant cast irons - evolution and prospects. Liteynoe proizvodstvo. 2000. No. 9. pp. 15–16.
4. Bobro Yu. G. Alloyed cast irons. Moscow: Metallurgiya. 1976. 288 p.
5. Silman G. I. Thermodynamics and thermokinetics of structure formation in cast irons and steels. Moscow: Mashinostroenie, 2007. 302 p.
6. Garber М. Е. Wear-resistant white cast irons: properties, structure, technology, use. Moscow: Mashinostroenie, 2010. 280 p.
7. Goldstein Ya. Е., Mizin V. G. Inoculation of iron-carbon alloys. Moscow: Metallurgiya, 1993. 416 p.
8. Karantzalis A. E., Lekatou A., Kapoglou A., Mavros H., Dracopoulos V. Phase Transformations and Microstructucal Observations During Subcritical Heat Treatments of a High-Chromium Cast Iron. Journal of Materials Engineering and Performance. 2012. Vol. 21, Iss. 6. pp. 1030–1039.
9. Gushchin N. S., Kulikov V. I., Nuraliev F. А., Takhirov А. А. Wear-resistant chromium alloyed cast irons with special properties. Liteynoe proizvodstvo. 2015. No. 4. pp. 7–11.
10. Efremenko V. G., Cheylyakh А. P., Kozarevskaya Т. V., Shimidzu К., Chabak Yu. G., Efremenko А. V. Interphase distribution of chemical elements in complex-alloyed white cast iron. Vestnik Priazovskogo gosudarstvennogo tekhnicheskogo universiteta. Tekhnicheskie nauki. 2014. No. 28. pp. 89–99.
11. Aleksandrov М. V. Structure formation and abrasive wear resistance of the cast composite material based on the system: alloyed white cast iron — TiС. Liteyshchik Rossii. 2015. No. 2. pp. 29–34.
12. Netrebko V. V. Features of alloying white wear-resistant cast irons. Lite i metallurgiya. 2014. No. 2(75). pp. 37–41.
13. Nofal Cmrdi Аdel. Metallurgical aspects of high-chromium white cast irons. Liteyshchik Rossii. 2017. No. 11. pp. 26–32.
14. Yoganandh J., Natarjan S., Kumaresh Babu S. P. Erosive Wear Behavior of Nickel-Based High Alloy White Cast Iron Under Mining Conditions Using Orthogonal Array. Journal of Materials Engineering and Performance. 2013. Vol. 22, Iss. 9. pp. 2534–2540.
15. Kawalec M. The spheroidization of VC carbides in high-vanadium cast iron. Archives of Foundry Engineering. 2011. Vol. 11 (spec. 3). pp. 111–116.
16. Sain P. K., Sharma C. P., Bhargava A. K. Microstructure Aspects of a Newly Developed, Low Cost, Corrosion-Resistant White Cast Iron. Journal Metallurgical and Materials Transactions : A. 2013. Vol. 44F. pp. 1665–1671.
17. Wang Z. H., He D. Y. et all. Effect of vanadium on property of Fe–Cr–C hard-facing alloy [J]. Transactions of the China Welding Institution. 2010. Vol. 31, Iss. 9. pp. 61–63.
18. Kawalec M., Corny M. Alloyed white cast iron with precipitation of spheroidal vanadium carbides VC. Archives of Foundry Engineering. 2012. Vol. 12(4). pp. 95–100.
19. Kolokoltsev V. M., Konopka Z., Petrochenko E. V. Zeliwo specjalne rodzaje, odlewanie, obrobka, cieplna, wtasciwosci. Czestochowa, 2013. 185 p.
20. Kazakov А. А., Pakhomova О. V., Kazakova Е. I. Study of the cast structure of industrial slab of ferrite-pearlite steel. Chernye Metally. 2012. No. 11. pp. 9–15.
21. Kondratyuk S. E., Vorobel R. А., Stas I. М., Brechko E. L., Bavda G. I. Characteristics of the dendritic structure in dependence on the crystallization conditions of carbon steels. Protsessy litya. 2009. No. 4. pp. 38–44.
22. Kolokoltsev V. М., Petrochenko Е. V., Molochkova О. S. Al influence on the phase composition, structure and properties of heat- and wear-resistance cast iron of Cr–Mg–Ni–Ti system. Chernye Metally. 2018. No. 7. pp. 6–11.
23. Kolokoltsev V. M., Petrochenko Е. V. Metallurgical and metallurgy aspects of enhancing the functional properties of cast articles from white cast irons. Vestnik Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta im. G. I. Nosova. 2014. No. 4 (48). pp. 87-98.
24. Kolokoltsev V. M., Petrochenko E. V. Structure features and properties of high-alloy white irons. Vestnik Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta im. G. I. Nosova. 2013. No. 5(45). pp. 3–8.
25. Gromczyk М., Kondracki М., Studnicki А., Szajnar J. Stereological analysis of carbides in hypoeutectic chromium cast iron. Archives of Foundry Engineering. 2015. Vol. 15, Iss. 2. pp. 17–22.
26. Petrochenko Е. V., Molochkova О. S. Analysis of the relationship of chemical composition, cooling conditions during solidification of the alloys with the structural features, oxidized surface and properties of the complex-alloyed white cast irons. Vestnik Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta im. G. I. Nosova. 2011. No. 4(36). pp. 50–53.
27. Kolokoltsev V. М., Petrochenko Е. V., Molochkova О. S. Structure and properties of heat- and wear-resistance white cast irons of the Cr–Mn–Ni–Ti system. Chernye Metally. 2016. No. 3. pp. 42–48.
28. Kolokoltsev V. M., Petrochenko E. V., Molochkova O. S. Influence of complex V, Cu, Ti and B alloying on structural and phase state, mechanical properties and wear resistance of white cast iron. CIS Iron and Steel Review. 2016. Vol. 11. pp. 23–29.
29. Kolokoltsev V. M., Petrochenko E. V., Molochkova O. S. Influence of boron modification and cooling conditions during solidification on structural and phase state of heat- and wear-resistant white cast iron. CIS Iron and Steel Review. 2018. Vol. 15. pp. 11–15.
30. Molochkova O. S. The choice of composition and the study of structure, properties of heat-resistant complex-alloyed white cast irons: Dissertation … of Candidate of Engineering Sciences. MGTU im. G. I. Nosova. Magnitogorsk, 2012. 123 p.
31. Petrochenko E. V. Features of crystallization, formation of structure and properties of wear- and heat-resistant cast irons in various cooling conditions: Dissertation … of Doctor of Engineering Sciences. Magnitogorsk, 2012. 310 p.
32. Lyakishev N. P., Tulin N. А., Pliner Yu. L. Alloying alloys and steels with niobium. Moscow: Metallurgiya, 1981. 190 p.
33. GOST 6130-71 Metals. Methods of determining heat resistance. Introduced: 01.01.1972.
34. GOST 7769-82 Alloy cast iron for castings of special properties. Grades. Introduced: 01.01.1983.
35. GOST 23.208-79 Ensuring of wear resistance of products. Wear resistance testing of materials by friction against loosely fixed abrasive particles. Introduced: 01.01.1981. |
