from the conferences organized by TANGER Ltd. provisional website
Asymmetric cryorolling is a technique that combines the features of asymmetric rolling and cryorolling, and can be used to produce ultrafine grained aluminum sheets. The problem with asymmetric cryorolling is the heat generated in the roll gap by high contact friction and the plastic deformation. Prediction of temperature rise during asymmetric cryorolling is very important. The temperature rise can be as large as to increase the sheet temperature above the cryogenic temperature. Therefore it is necessary to estimate the actual sheet temperature during asymmetric cryorolling for a precise control of recovery, and hence of the grain size. This paper presents the results of the finite element simulation of heat transfer during asymmetric cryorolling of aluminum alloys. The effects of thickness reduction (20 – 60 %), rolls speed ratio (0 – 60 %), friction coefficient (0.1 – 0.4), rolling velocity (0.05 – 10 m/s) and roll temperature (77 – 300 K) on the temperature rise in the strip during asymmetric cryorolling were found. The results of investigation can be useful for the development of the optimal treatment process of aluminum alloys by cryogenic severe plastic deformation to obtain the ultrafine grain structure and high strength properties.Keywords: Asymmetric cryorolling, aluminum alloy, finite element method, temperature field, severe plastic deformation
© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.