PREDICTION OF STRUCTURE CHANGE OF AUSTENI TE OF LOW-CARBON STEELS

Dynamic and static recrystallization behavior of gamma grains of low c arbon steels have been studied by means of hot working simulator. The obtained results are the following. Dynamic recrystallization is initi ated after some critical degree of deformation epsilon(c) which decrea ses as the temperature increases and the initial grain size becomes fi ner. Dynamically recrystallized fraction increases as increasing the s train, the strain rate and the temperature. On the other hand, statica lly recrystallized grain size becomes finer with decreasing the initia l grain size and with increasing the strain, and statically recrystall ized fraction increases markedly after deformation as increasing the t emperature and the strain. On the basis of these results, a prediction model of gamma structure changes after deformation is developed and i ts availability in the case oi hot mill rolling was certified.