Аңдатпа
The paper presents the results of microstructure evolution obtained by finite element modeling in the DEFORM program for various types of rolling in relief rolls: symmetric rolling, asymmetric rolling with an asymmetry coefficient of 1.5 due to the roll diameters of 200 and 300 mm, as well as single-drive rolling, in which one of the rolls is driven and the other roll is idling. After rolling in relief rolls, the billet undergoes two-stage leveling in smooth rolls. The presence of a single driven roll with the ability to adjust its rotational speed allows for a higher asymmetry coefficient. The microstructure evolution was evaluated using the Cellular Automata method, which allows for the assessment of changes in both the size and shape of the grains. It was found that using a billet with a heating temperature of 700°C is the most preferable option in all cases, as it eliminates the negative effect of static recrystallization, and the implementation of single-drive rolling allows for the highest degree of grain refinement.