Abstract
In this study, the effect of deformation temperature (800°C, 850°C and 900°C), strain rate (1 s -1 and 5 s -1 ) and amount of strain (1, 2 and 3) in the occurrence of dynamic mechanisms of grain refinement in two C-Mn steels without and with Nb addition (0.035 wt.%) was evaluated. The steels were deformed by torsion in a Gleeble thermomechanical simulator and water cooled immediately after deformations. Different dynamic mechanisms of ferritic grain refinement were obtained as a function of the deformation temperature. At higher deformation temperatures the ferritic grain refinement occurred by dynamic recrystallization of austenite (DRA) and in lower temperatures the operating mechanism
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