Dynamic recrystallization behavior of AISI 321 austenitic stainless steel were studied using hot compression
tests over the range of temperatures from 900 °C to 1200°C and strain rates from 0.001 s-1 to 1 s-1. The critical
strain and stress for initiation of dynamic recrystallization were determined by plotting strain hardening rate
vs. stress curves and a constitutive equation describing the flow stress at strains lower than peak strain. Also, the
strain at maximum flow softening was obtained and the effect of deformation conditions (Z parameter) on the
critical strain and stress were analyzed. Finally, the volume fraction of dynamic recrystallization was calculated at
different deformation conditions using these critical values. Results showed that the model used for predicting
the kinetics of dynamic recrystallization has a great consistency with the data, in the form of θ-ε curves,
directly acquired from experimental flow curves.