DOI: 10.18503/1995-2732-2024-22-3-52-59
Abstract
The article presents the results of a study on the processes of forming the structure and properties of aluminum billets cast under vibration on a semi-continuous casting machine. The study shows that vibration used in the formation of semi-continuously cast billets significantly improve heat exchange in the forced cooling zones, which, in turn, should influence the quality of the metal in cast billets and increase performance of the process in general. It has been found that under vibration heat removed in the mold increases significantly for both billets (made of camphene and the aluminum alloy). This is an important applied factor since in real conditions due to insufficient heat removal in the mold the exit cast billets have small thickness of the solidified shell, leading to a breakthrough of liquid metal with the relevant consequences. At the same time, vibration due to the force action on solidifying metal has a significant effect on the formation of the structure and properties of cast billets: firstly, provoking the nucleation of crystallization centers due to cavitation, and, secondly, the destruction of growing crystals. This force impact of the vibration pulse, in particular for aluminum alloy AD31, refines the macro- and microstructure of cast metal up to 3 times, and also increases its strength characteristics up to 20% with unchanged plasticity. Besides, vibration reduces the transcrystallization zone due to the destruction of columnar crystals and, consequently, reduces structural heterogeneity and anisotropy of the metal properties along the cross-section of the cast billet. Thus, the study shows the advantages of using vibration in the formation of semi-continuously cast billets and proves its significant potential for improving the quality of the produced billets and increasing performance of the continuous casting process. The most optimal process flow chart for applying vibration in continuous casting is to supply a vibration pulse to the mold and the cast billet at the same time.
Keywords
alloy, crystallization, structure formation, properties, heat transfer, cast metal, billet
For citation
Uzdieva N.S., Akhtaev S. S-S., Aisungurov N.D. Formation of Semi-Continuously Cast Billets Under Vibration. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2024, vol. 22, no. 3, pp. 52-59. https://doi.org/10.18503/1995-2732-2024-22-3-52-59
1. Nuradinov A.S., Taranov E.D., Eldarkhanov A.S. The influence of vibration on the thermophysical conditions of forming continuously cast billets. Protsessy litya [Casting Processes]. 2011;(2):34-38. (In Russ.)
2. Nuradinov A.S., Uzdieva N.S., Akhtaev S.S.-S. Roll casting: rolling of high-strength aluminum alloys. Vestnik GGNTU. Tekhnicheskie nauki [Herald of Grozny State Oil Technical University. Technical Sciences]. 2023;19(1(31)):58-66. (In Russ.)
3. Prikhodko O.G., Deev V.B., Prusov E.S. et al. Crystallization and formation of the structure of aluminum alloys and castings after external physical actions in the casting process. Metallurgiya: tekhnologii, innovatsii, kachestvo: trudy XXII Mezhdunarodnoy nauchno-prakticheskoy konferentsii [Metallurgy: Technologies, Innovations, Quality. Proceedings of the 22nd International Scientific and Practical Conference]. Novokuznetsk, 2021, pp. 316-321. (In Russ.)
4. Prusov E.S., Deev V.B., Rakhuba E.M. Influence of crystallization conditions on the formation of the structure of composite alloys. Liteynoe proizvodstvo [Foundry]. 2019;(3):6-8. (In Russ.)
5. Uzdieva N.S., Nuradinov A.S., Akhtaev S.S.-S., Isaeva M.R. Effect of insoluble impurities and vibration on crystallization processes in molten metals. Vestnik GGNTU. Tekhnicheskie nauki [Herald of Grozny State Oil Technical University. Technical Sciences]. 2023;19(2(32)):57-63. (In Russ.)
6. Zeng J., Koitzsch R., Pfeifer H., Friedrich B. Numerical simulation of the twin-roll casting process of magnesium alloy strip. Journal of Materials Processing Technology. 2009;209:2321-2328.
7. Smulsky A.A., Semenchenko A.I., Elov S.M. Thermal analysis of aluminum alloys. Protsessy litya [Casting Processes]. 2002;(1):10-16. (In Russ.)
8. Eldarkhanov A.S., Nuradinov A.S., Uzdieva N.S. et al. Control of heat exchange processes in a roll mold during rolling from the molten condition. Stal [Steel]. 2022;(4):7-11. (In Russ.)
9. Nuradinov A.S., Nogovitsyn A.V., Nuradinov I.A. et al. Study of the possibility of controlling the formation of crystal structure of metal alloys. Science and Innovation. 2020;(16(4)):67-73.
10. Wei Yan, Zhanquan Hao, Weiqing Chen, Jing Li. Mixing effect of slag compositions and additives on crystallization of mold fluxes for Ti-bearing steels. Journal of Materials Research and Technology. 2021;10:882-894.
11. Kuzmichev V.E. Zakony i formuly fiziki. Spravochnik [Laws and formulas of physics. Handbook]. Kyiv: Naukova dumka, 1989, 864 p. (In Russ.)
12. Nuradinov A.S. Heat exchange processes in the formation of continuously cast billets. Liteyshchik Rossii [Foundry of Russia]. 2006;(7):34-37. (In Russ.)
13. Nuradinov A.S., Eldarkhanov A.S., Taranov E.D. Heat exchange processes during the formation of concast billets in the field of elastic vibrations. Stal [Steel]. 2006;(6):51-52. (In Russ.)