Abstract
In the rolling process of heavy cylinders, the deformation section is subjected to the effects of compression and shear. In order to analyze the influences of the shear effect on the microstructure evolution characteristics, a mathematical model was established and the rolling process was simulated. Firstly, shear-compression specimen (SCS) and ordinary cylinder specimens were designed, high-temperature compression experiments were carried out and the mathematical model of microstructure evolution considering shear effect was established; then, a program based on finite element software was developed to simulate the microstructure evolution process, and the feasibility of the development program was verified by compression experiments. Finally, a macro–micro coupling model based on the development program was established to simulate the microstructure evolution of the heavy cylinder during the rolling process. Then, the influence of the shear effect on the microstructure evolution was analyzed. The results showed that the shear effect had a great influence on the heavy cylinder. Dynamic recrystallization was more likely to occur in the heavy cylinder during the rolling process and the grain refinement was more obvious; compared with the case without considering the shear effect, the volume fraction of dynamic recrystallization was increased by 0.25%, and the grain size was refined by 30 μm.
Highlights
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(1) For the same specimen, the grain size increased with the increase in deformation temperature, when the deformation rate remained constant; (2) for the same specimen, the grain size increased with the decrease in the deformation rate, when the deformation temperature remained constant; (3) compared with the common cylinder specimen and the shear-compression specimen (SCS), the grain size of the SCS was smaller and the refinement effect of dynamic recrystallization was better under the same deformation conditions
The results showed that the dynamic recrystallization deformation of SCS occurs more and the grain size is better refined under the same deformation conditions
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. It is necessary to analyze the shear effect and simulate the microstructure evolution process of heavy cylinders during the rolling process. In this paper, the microstructure evolution model of the metal material deformation process was established based on the shear effect, and through the secondary development of the finite element software, simulation research on the microstructure evolution of the cylinder rolling process was realized. The second section presents the high-temperature compression experiment of the SCS and ordinary cylinder specimen and analyzes the influence of the shear effect. The fifth section presents the microstructure evolution characteristics of the rolling process and demonstrates the importance of the shear effect
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