Prediction of Structure Change of Austenite of Low Carbon Steels

Abstract

Dynamic and static recrystallization behavior of γ grains of low carbon steels have been studied by means of hot working simulator. The obtained results are the following. Dynamic recrystallization is initiated after some critical degree of deformation ε_c which decreases as the temperature increases and the initial grain size becomes finer. Dynamically recrystallized fraction increases as increasing the strain, the strain rate and the temperature. On the other hand, statically recrystallized grain size becomes finer with decreasing the initial grain size and with increasing the strain, and statically recrystallized fraction increases markedly after deformation as increasing the temperature and the strain. On the basis of these results, a prediction model of γ structure changes after deformation is developed and its availability in the case of hot mill rolling was certified.