The effect of speed asymmetry on the strain state in aluminium bimetals during accumulative rolling

Abstract

Methods of severe plastic deformation are one of the most modern and cost-effective methods for obtaining high values of mechanical properties in metals and alloys. It is possible to obtain an ultrafine-grained structure due to such processes. The shear component has a significant effect on the value of the true deformation in case of using the methods of severe plastic deformation. In this paper, the strain state of aluminium alloys Al5083, Al1070, and Al2024 in the process of bimetal asymmetric rolling and accumulative rolling was investigated. Symmetrical and asymmetrical rolling of a sample was simulated in the Deform 2D software package. The thickness of the workpiece was 2 mm, the reduction by one pass was 50%, the friction coefficient on the contact of the metal and the rolls ranged from 0.1 to 0.4, the velocity of the rolls was 1.047 rad / s in the symmetric case. The discrepancy between the speeds of the rolls was 10-50%. The presented data agree with the known experimental data on the processing of aluminium alloys, thus the result obtained provide for obtaining the UFG structure in these alloys.