Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia

V. M. Kolokoltsev, Dr. Eng., Prof., Advisor to the Rector's Office, e-mail: kwm@magtu.ru
N. A. Feoktistov, Cand. Eng., Associate Prof., Head of the Dept. of Foundry Processes and Materials Science, e-mail: fna87@mail.ru
E. V. Skripkin, Postgraduate Student, Dept. of Foundry Processes and Materials Science, e-mail: skripkin-86@yandex.ru
V. P. Chernov, Dr. Eng., Prof., Dept. of Foundry Processes and Materials Science, e-mail: tchernov42@mail.ru

South Ural State University, Chelyabinsk, Russia
V. K. Dubrovin, Dr. Eng., Prof., Dept. of Pyrometallurgical Technologies, e-mail: dubrovinvk@susu.ru

The article presents the computer modeling results of the working layer fusion process of a high-alloy steel rolling roll with a core, which made it possible to determine the temperaturetime conditions under which strong adhesion of dissimilar metals occurs, as well as a trouble-free operation of the rolling roll in hot rolling mills. In the process of obtaining a rolling roll, one of the most important operations is the casting of the core with high-strength cast iron. The result of this operation is a high-quality bond between the working layer and the core. The article presents the results of a temperature and time parameters analysis of the working layer fusing process with the core and identifies the conditions that ensure the best possible bond between them. The thermal fields in the mold-working layer-core system, which are formed in this system after casting the high-strength cast iron, have been determined by calculation. The temperature gradient that can be achieved when casting cast iron over a crystallized working layer, as well as the temperature and time conditions for the interaction between cast iron and steel, have been determined to ensure high-quality the working layer fusion with the core. The results of computer modeling in «PoligonSoft» computer modeling system were verified with ultrasonic testing of an experimental rolling roll, as well as evaluated with fusion zone metallographic analysis. The structure of steel and cast iron fusion zone was established by applying metallographic analysis as well as a comparative analysis of the alloys hardness in the roll barrel section from the core through the fusion zone to the working layer was carried out. It was found that the hardness of the core is two times lower than that of the working layer, the length of the fusion zone is about 1000 μm.

The study was carried out by grant of the Russian Science Foundation No. 25-79-31018, https://rscf.ru/project/25-79-31018/.

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