A Study on Non-Isothermal Static Recrystallization During Hot Rolling of Carbon Steels

Abstract

In this article, the effects of hot rolling parameters on static recrystallization, mechanical properties, and final microstructures of a low carbon steel have been investigated. A numerical analysis was first employed to determine distributions of temperature, strain, and strain rate during hot rolling and then the predicted results were combined with the additivity rule together with Avrami equation to evaluate the progress of non-isothermal static recrystallization after hot rolling. In the next stage, hot rolling experiments have been performed under different rolling conditions to assess the effects of rolling layout on microstructures and mechanical properties of the rolled steel. The results indicate that temperature distribution and the kinetics of subsequent static recrystallization are significantly affected by the employed deformation rate during hot rolling. Furthermore, increasing rolling speed alters flow stress and behavior of hot rolled strip while yield stress increases and even the Lüders bands are disappeared in the samples rolled under high speeds.