Influence of cold rolling reduction on the deformation behaviour and crystallographic orientation development

In the present paper, a systematic study has been conducted aiming to attain an insight into the influence of rolling reduction on the deformation behaviour and crystallographic orientation development during cold rolling. Simulations were successfully carried out using a crystal plasticity finite element method (CPFEM) model with the highest reduction of 80%. Aluminium single crystals with initial ideal Cube orientation ({0 0 1}〈1 0 0〉) were selected in order to avoid the influence of grain boundaries. The results revealed the development of deformation matrix bands through the billet thickness, parallel to the rolling direction, which have been observed in the experiment in the literature. The sign of rotation angles in the neighbouring matrix bands are opposite with each other, even at the reduction of 80%. The corresponding {1 1 1} pole figures offered direct evidence of the spread of crystallographic orientation around the transverse direction. It is clear from the current study that the rolling reduction significantly influences the deformation heterogeneity which leads to the inhomogeneous texture evolution, non-uniform distributions of macroscopic stress and strain in the cold rolled samples. The slip system activity has been examined in detail and the predicted results are consistent with the early reported experiments.