Abstract
Materials with ultrafine grain structure and unique physical and mechanical properties can be obtained by severe plastic deformation methods including the asymmetric rolling processes. Asymmetric rolling is a very effective way to generate ultrafine grain structures in steels, magnesium alloys and other materials. Since the asymmetric rolling is a continuous process, it has great potential for industrial production of ultrafine grain structure sheets and bars. Basic principles of asymmetric rolling are described in detail in scientific literature. Focus in the well-known works is on the possibility to control the structure of metal sheets. This study reflects the investigation findings regarding the impact of speed asymmetry on shear strain during rolling of sheet and bars in the three-roll passes. Numerical comparison of shear strain ratios in case of symmetric and asymmetric rolling is made in this study. Adequacy of the developed models is demonstrated. The results of this research work will be useful for the analysis of ultrafine grain structure evolution of metals in various asymmetric cold rolling processes.
Keywords
Asymmetric rolling, finite element method, shear strain, severe plastic deformation
1. Pesin A., Salganik V., Trahtengertz E., Drigun E., 2000. Development of the asymmetric rolling theory and technology. Proceedings of the 8-th International Conference on Metal Forming 2000, 311-314.
2. Pesin A., Salganik V., Trahtengertz E., Cherniahovsky M., Rudakov V., 2002. Mathematical modeling of the stress-strain state in asymmetric flattening of metal band. Journal of Materials Processing Technology 125-126, 689-694.
3. Pesin A., 2003. Practical results of modeling asymmetric rolling. Steel in Translation 33, 46-49.
4. Pesin A.M., 2003. New solutions on basis of non-symmetric rolling model. Stal, 66-68.
5. Kyung-Moon Lee, Hu-Chul Lee, 2010. Grain refinement and mechanical properties of asymmetrically rolled low carbon steel. Journal of Materials Processing Technology 210, 1574-1579.
6. Chang L.L., Cho J.H., Kang S.B., 2011. Microstructure and mechanical properties of AM31 magnesium alloys processed by differential speed rolling. Journal of Materials Processing Technology 211, 1527-1533.
7. Weijun Xia, Zhenhua Chen, Ding Chen, Suqing Zhu, 2009. Microstructure and mechanical properties of AZ31 magnesium alloy sheets produced by differential speed rolling. Journal of Materials Processing Technology 209, 26-31.
8. Zuo Fang-qing, Jiang Jian-hua, Shan Ai-dang, Fang Jian-min, Zhang Xing-yao, 2008. Shear deformation and grain refinement in pure Al by asymmetric rolling. Transactions of Nonferrous Metals Society of China 18, 774-777.
9. Ji Y.H., Park J.J., Kim W.J., 2007. Finite element analysis of severe deformation in Mg-3Al-1Zn sheets throughout differential-speed rolling with a high speed ratio. Materials Science and Engineering A 454-455, 570-574.
10. Sverdlik M., Pesin A., Pustovoytov D., Perekhozhikh A., 2013. Advanced Materials Research 742, 476-481.
11. Ji Y.H., Park J.J., 2009. Development of severe plastic deformation by various asymmetric rolling processes. Materials Science and Engineering A 499, 14-17.
12. Kim W.J., Hwang B.G., Lee M.J., Park Y.B., 2011. Effect of speed-ratio on microstructure, and mechanical properties of Mg-3Al-1Zn alloy, in differential speed rolling. Journal of Alloys and Compounds 509. 8510-8517.
13. Angella G., Esfandiar Jahromi B., Vedani M., 2013. A comparison between equal channel angular pressing and asymmetric rolling of silver in the severe plastic deformation re-gime. Materials Science and Engineering A 559, 742-750.
14. Saeed Tamimi, João P. Correia, Augusto B. Lopes, Said Ahzi, Frederic Barlat, Jose J. Gracio, 2014. Asymmetric rolling of thin AA-5182 sheets: Modelling and experiments. Materials Science and Engineering A 603, 150-159.
15. Furukawa M, Horita Z, Nemoto M, Langdon T.G, 2001. Review: Processing of Metals by Equal-channel Angular Pressing. Journal of Material Science 36, 2835-2843.
16. Tkachenko A., Eremin A., Gorkin N., Birykov M., 2012. Cassette-type stand with dual adjustable gauges for three-roll rolling of section bars. Modeling and development of metal forming processes, 237-244.