Experimental and Numeric Analysis of Strain and Texture of Asymmetric Rolled AA1050 Aluminum

B. D. ZANCHETTA; F. S. NASCIMENTO; A. M. KLIAUGA; J. B. RUPERT; R. E. BOLMARO

Saint George

Conferencia; 18th International Conference on Textures of Materials; 2017

Brigham Young University, Utah.

The asymmetrical rolling (AR) increases the shear strain during deformation by changing the speed ratio between the superior and the inferior rolls. This will modify the texture of the deformed material and induce greater grain refinement [1]. It also modifies the recrystallization textures and thus alter the plastic anisotropy of rolling sheets [2]. In this work we quantified the equivalent deformation and the induced percentage of shear of a AA1050 aluminum at speed ratios of 1.5 and 2.0 and thickness reduction per pass of 10% and 5% up to an equivalent deformation of 1.4. The experimental results were compared with the numerical simulation using DEFORM V10. The crystallographic orientation was measured by x-ray diffraction at the samples middle plane after each pass. The initial sample had a recrystallization texture with a clear cube texture. The distribution of shear, compression and rigid body rotation was obtained from the finite element simulation. Most of the shear components were concentrated at the sub surface planes, closer to the rolls; and, at the samples middle plane the rigid body rotation was the predominant strain component. A clear difference in texture between surface and center was measured at an equivalent deformation of 1.0. Consequently the measured texture for the initial rolling passes showed only a progressive rotation of the texture components, whereas the subsurface region presented shear components. Only after the final reduction steps shear components could be identified at the middle plane. Increasing the tangential speed ratio yielded higher shear strains but the effect of reducing the reduction step was much more pronounced.