Journals →  Tsvetnye Metally →  2017 →  #7 →  Back

MATERIALS SCIENCE
ArticleName Distinctive features of the structure and characteristics of long-length light gauge ingots from aluminium alloys, cast into electromagnetic crystallizer
DOI 10.17580/tsm.2017.07.12
ArticleAuthor Avdulov A. A., Usynina G. P., Sergeev N. V., Gudkov I. S.
ArticleAuthorData

RPC “Magnetic Hydrodynamics”, Krasnoyarsk, Russia:

A. A. Avdulov, Head of Department of Continuous Casting Technologies
N. V. Sergeev, Leading Engineer of High-frequency Currents Department
I. S. Gudkov, Leading Engineer of Department of Continuous Casting Technologies, e-mail: rdohead@mail.ru

LLC “KiK”, Krasnoyarsk, Russia.

G. P. Usynina, Head of Independent Laboratory

Abstract

The technology for continuous casting of aluminium alloys into electromagnetic crystallizers was first being developed in 1980s under management of Z. N. Getselev. The given method is being further developed in the RPC “Magnetic Hydrodynamics” company. By now its employees have mastered a continuous casting of long-length light gauge blanks and casting of cylindrical ingots with a diameter of 70 mm. This paper describes the properties of light gauge blanks. Casting into an electromagnetic crystallizer is significantly different than the methods for casting of ingots where the molten metal has no contact with the mould’s wall; which enables a faster crystallization and thus affects the melt of a high-frequency electromagnetic field. There are given the results of researching the structure and properties of long-length ingots (with a diameter of 8 mm) from aluminium alloys that were cast into an electromagnetic crystallizer. A refinement of dendrite cells and a reduction of the width of eutectic layers were noted. It was shown that casting into electromagnetic crystallizers can guarantee metal cleanness in the case of nonmetallic inclusions without a preliminary cleaning of the melt (refinement, degasification etc.). The reason for the absence of non-metallic inclusions and other impurities in light gauge ingots, cast into an electromagnetic crystallizer, lies in properties of crystallization of the melt in a high-frequency electromagnetic field. It was determined that ingots with small diameters, cast into an electromagnetic crystallizer, have a dispersed structure where the dendrite cell size is 4 μm, which is typical for granulated aluminium alloys that are obtained at cooling speeds of 103–104 °С/sec. The obtained cast material’s properties are comparable with properties of a deformed material.

keywords Electromagnetic crystallizer, casting of metals into electromagnetic field, aluminium alloys, electromagnetic effect on the melt, high-frequency currents, granulated alloys
References

1. Getselev Z. N. et al. Continuous casting in electromagnetic crystallizer. Moscow : Metallurgiya, 1983. 152 p.
2. Dobatkin V. I., Elagin V. I. Granulated aluminium alloys. Moscow : Metallurgiya, 1983. 176 p.
3. Isco M., Harumi K., Katsusome N. Supersaturation and decomposition of Al – Fe alloys during solidification. Journal of Japan Institute of Light Metals. 1973. Vol. 25, No. 1. pp. 1–9.
4. Azamatov R. A., Aleksandrov V. K., Andreev A. D. et al. Light alloys metallurgy. Moscow. : Metallurgiya, 1983. 311 p.
5. Shmorgun V. G., Gurevich L. M., Trudov A. F., Pisarev S. P. et al. Mechanical properties of wire with bearing layer made of aluminium alloy 01417. Izvestiya VolGTU. 2014. Vol. 136, No. 9. pp. 15–18.
6. Lopatina E. S., Voroshilov D. S., Zaporozhets O. A. Investigation of technological parameters of obtaining of 01417 alloy ingots in electromagnetic crystallizer. Youngsters and science: collection of materials of the VI All-Russian scientific-technical conference of students, post-graduate students and young scientists. Krasnoyarsk : Sibirskiy federalnyy universitet, 2011. pp. 31–35.
7. E. Baake et al. MHD technologies in metallurgy. Intensive course specific IV. Saint Petersburg : SPbGETU “LETI”, 2013. 250 p.
8. State Standard GOST 11739.22–90. Aluminium casting and wrought alloys. Methods for determination of rare-earth elements and yttrium. Introduced: 1991–07–01.
9. State Standard GOST 9012–59. Metals. Method of Brinell hardness measurement. Introduced: 1960–01–01.
10. Stetsenko V. Yu. Mechanisms of crystallization process of metals and alloys. Lite i metallurgiya. 2013. No. 1. pp. 48–54.
11. Stetsenko V. Yu. Definition of the casting mechanisms of aluminum-silicon alloys with superfine and inverted microstructure. Lite i Metallurgiya. 2013. No. 2. pp. 22–29.
12. Verkhovlyuk A. M., Shcheretskiy A. A., Lakhnenko V. L., Apukhtin V. V., Nazarenko A. V. Prospective modifiers for aluminum-based alloys. Lite i Metallurgiya. 2013. No. 3. pp. 68–71.
13. Masahiro Tani, Masafumi Zeze Takehiko Toh, Keiji Tsunenari. Electromagnetic Casting Technique for Slab Casting. Nippon steel technical report. 2013. No. 104. pp. 56–61.
14. Hai Hao, Xingguo Zhang, Shan Yao. Improvement of casting speed and billet quality of direct chill cast aluminum wrought alloy with combination of slit mold and electromagnetic coil. Materials Transactions. 2007. Vol. 48, No. 8. pp. 2194–2201.
15. Grandfield J. F., Davidson C. J., Taylor J. A. Application of a new hot tearing analysis to horizontal direct chill cast magnesium alloy AZ91. Light Metals. 2001. No. 1. pp. 895–901.
16. Evans J. W. The use of electromagnetic casting for AI alloys and other metals. JOM. 1995. Vol. 47. pp. 38–41.
17. Yu-bo Zuo, Jian-zhong Cui, Dan Mou, Qing-feng Zhu, Xiang-jie Wang, Lei Li. Effect of electromagnetic field on microstructure and macrosegregation of flat ingot of 2524 aluminium alloy. Transactions of Nonferrous Metals Society of China. 2014. Vol. 24. pp. 2408–2413.

Language of full-text russian
Full content Buy
Back