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Mehdi Shaban Ghazani,Beitallah Eghbali,Gholamreza Ebrahimi 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.5
Dynamic recrystallization behavior of AISI 321 austenitic stainless steel were studied using hot compressiontests over the range of temperatures from 900 °C to 1200 °C and strain rates from 0.001 s-1to 1 s-1. The criticalstrain and stress for initiation of dynamic recrystallization were determined by plotting strain hardening ratevs. stress curves and a constitutive equation describing the flow stress at strains lower than peak strain. Also, thestrain at maximum flow softening was obtained and the effect of deformation conditions (Z parameter) on thecritical strain and stress were analyzed. Finally, the volume fraction of dynamic recrystallization was calculated atdifferent deformation conditions using these critical values. Results showed that the model used for predictingthe kinetics of dynamic recrystallization has a great consistency with the data, in the form of θ-ε curves,directly acquired from experimental flow curves.