Study of localized plasticity bands in rolled steel sheets via speckle photography

This work aims to study the plastic deformation heterogeneity in flat samples of low-carbon steel under uniaxial tension. It is shown that at different stages of work hardening, the local elongation distributions possess a spatiotemporal ordering in the form of macroscopic zones of localized plastic deformation. An unambiguous correspondence is established between the current law of work hardening and the localized plasticity distributions recorded via speckle photography. Unfolding, etching and winding cause the changes in both the mechanical properties and localized plasticity behavior within the roll. The effect of the fractured surface layer on the local deformation distribution is established as well. Since the local deformation foci lead to the loss of plastic flow stability during cold rolling, understanding their nucleation and development regularities is of great importance in the design of technological modes for the manufacturing of products with complex shapes.