PREDICTION OF RESIDUAL STRESS AFTER ROLLING AND RECRYSTALLIZATION

Recrystallization treatment in metallic materials introduces micro-stresses at the grain level and micro-micro-stresses at the crystalline lattice level, however, it relieves the residual macro-stresses. It is a subject of interest in metallurgy and materials science, as an atomic-scale phenomenon. Since mechanical sciences treat materials as continuums, recrystallization works as a classic stress relief annealing treatment. In this context, in the present work the authors investigated the effect of recrystallization on the residual macro-stresses, in the thickness plane of cold-rolled steel sheets. The proposed method was a process simulation by a mathematical correlation proposed in a previous work, aided by numerical simulation of thermal behavior. It was found that tensile stresses were introduced at the surface and compressive stresses at the center of the sheet, contrarily to the original residual stress profile normally introduced by forming. The curves obtained analytically and numerically were compared with experimental and literature results, showing that the proposed method achieved satisfactory coincidence.