Формування структури листових заготовок при валковій розливці металів

• Дата: 2022
• Автори: Нурадінов, А. С., Ноговіцин, О. В., Школяренко, В. П., Нурадінов, І. А.
• Формат: Стаття
• Мова: Ukrainian
• Опубліковано: National Academy of Sciences of Ukraine, Physical-Technological Institute of Metals and Alloys of NAS of Ukraine 2022
• Теми: валкове розливання-прокатка металів; валковий кристалізатор; гідродинаміка розплаву; температура перегріву; інтенсивність теплообмінних процесів; листова заготовка; швидкість розливання; трансформація структури
• Онлайн доступ: https://plit-periodical.org.ua/index.php/plit/article/view/formation-structure-sheet-blanks-during-roll-casting-metals
• Назва журналу: Casting Processes

УДК 669.1: 669.2: 536.2 The physical modeling method was used to study the processes of formation of the structure of sheet blanks during ingotless casting-rolling of metals. At the same time, on the basis of theoretical analysis, the main parameters are determined, with the help of which it is possible to effectively control the processes of crystallization and the formation of the structure of sheet blanks. The studies carried out made it possible to establish the regularities of the influence of hydrodynamic and thermophysical conditions of pouring metal (the speed and nature of metal movement in the inter-roll space, the overheating temperature of the melt and the intensity of heat removal from it) on the processes of its crystallization and structure formation. A transparent organic alloy camphene (C10H16) was used as a modeling medium, which makes it possible to visually study these processes during the ingotless rolling of metals. Due to the transparency of camphene, the transformation of the sheet blank structure at different stages of its formation was clearly studied: the rough primary structure of the crusts solidifying on the rolls, due to their partial deformation in the rolling zone, passes into a fine-grained structure upon exiting it. The dependence of the linear rate of metal pouring on the overheating temperature of the melt and the intensity of heat exchange processes in the roller mold is shown. At the same time, the optimal ranges of values of these parameters are determined, which ensure the stability of the process of roll casting of metals. The results obtained were the basis for the development of practical recommendations for roll casting of real metals, in particular aluminum alloys of various grades.   References 1. Chalmers B. (1968) Theory of solidification. Moscow: Metallurgy. 288 p. [in russian].2. Flemings M. S. (1977) Solidification processes. Moscow: Mir. 423 p. [in russian].3. Balandyn G. F. (1979) Formation of the crystal structure of castings. Moscow: Mashinostroenie. 288 p. [in russian].4. Ovsienko D. E. (1994) Genesis and growth of crystals from the melt. Kyiv: Nauk. Dumka. 256 p. [in russian].5. Efimov. V. A., Eldarkhanov A. S. (2004) Technologies of modern metallurgy. Moscow: New Technologies. 784 p. [in russian].6. Nuradinov A. S., Nakhaev M. R. (2020) Processes of crystallization and formation of the structure of cast blanks. Grozny: publishing house of Chechen State University. 170 p. [in russian].7. Eldarkhanov A. S., Efimov V. A., Nuradinov A. S. (2001) Casting formation processes and their modeling. Moscow: Mashinostroenie. 206 p. [in russian].8. Brovman M. Ya., Nikolaev V. A., Polukhin V. P. (2007) The length of the zone of plastic deformation and the permissible speed during ingotless rolling of steel strips. Metally. No. 1. P. 44–49. [in russian].9. Brovman M. Ya., Nikolaev V. A., Polukhin V. P. (2007) Analysis of the temperature regime and improvement of the cooling efficiency of rolls and rollers. Rolled production. No. 7. P. 36–43. [in russian].10. Kawalla R. (2011) Properties of Magnesium Strips produced by Twin-Roll-Casting and Hot Rolling. Materials Science Forum. Vol. 690. P. 21–24. [in russian].11. Efimov V. A., Anisovich G. A., Babich V. N. et al. (1991) Special methods of casting: Reference book. Moscow: Mashinostroenie. 436 p. [in russian].12. Brovman M. Ya., Nikolaev V. A. (2006) On improving the quality of the surface of the strip during rolling in rolled combined aggregates. Rolled products production. No. 5. P. 9–14. [in russian].13. Shur I. A. (2001) Prospects for the development of ingotless rolling of aluminum alloys. Technology of light alloys. No. 5–6. P. 38–41. [in russian].14. Buchner Achim R. (2004) Thin Strip Casting of Steel with a Twin Roll Caster-Correlation between Feeding System and Strip Quality. Steel Research. No. 1. R. 5–12. [in russian].15. Kats A. M., Kudin M. V., Shatalov R. L. (2002) Investigation of heat transfer and solidification during ingotless rolling of low-alloyed zinc. Tsvetnye metally. No. 9. P. 80–85. [in russian].16. Nuradinov A. S., Nogovitsyn A. V., Nuradinov I. A. et al. (2020) Research of possibility of control of the formation of crystal structure of metal alloys. Science and innovation. No. 16 (4). P. 67–73. [in russian].17. Eldarkhanov A. S., Nuradinov A. S., Uzdiyeva N. S. et al. (2019) Optimization of the thermal performance of the MNLZ crystallizer. Metallurg. No. 1. P. 17–23. [in russian].