EVOLUTION OF THE MICROSTRUCTURE IN THE HOT-ROLLING PROCESS

A thermomechanical finite-element model of flat rolling is coupled wit h closed form equations describing the process of recrystallization an d is applied to study hot rolling of low carbon steel strips. Formulae for the recrystallized grain diameters, developed by various authors, are considered. Calculated diameters of the grains are compared with the results of the measurements carried out after experimental hot rol ling of the carbon steel samples. Evaluating the accuracy of the calcu lations, using each of the expressions for the diameter of the recryst allized austenite grains, indicates that the relation of Roberts is cl osest to the measurements.