The critical strain for initiation of dynamic recrystallization is an important value in case of thermomechanical process design. In this research, different models have been utilized to describe hot compression flow curves of C45 carbon steel up to the peak point. Further, equations derived from these models were used to calculate the critical strain in wide range of thermomechanical conditions. Thus calculated values of the critical strain are function of the peak strain and of other deformation parameters. The calculations showed comparable results of almost each derived equation.Keywords: hot deformation, flow curve modeling, onset of dynamic recrystallization
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