E Kevanlo - Department of Materials and Polymer Engineering, Hakim Sabzevari University, Sabzevar, Iran
G.R Ebrahimi - Department of Materials and Polymer Engineering, Hakim Sabzevari University, Sabzevar, Iran
S.A.A Sani - Department of Materials Science and Engineering, Iran University of Sience and Technology, Tehran, Iran
A Momeni - Department of Materials Science and Engineering, Hamedan University of Technology, Hamedan, Iran

In this work dynamic recrystallization behavior of AISI 403 martensitic stainless steelwas studied using hot compression tests over temperature range of 900°C -1200°C and strain raterange of 0.001 s-1-1 s-1. The obtained flow curves showed that the hot compression behavior of thealloy is controlled by dynamic recrystallization. The flow stress and strain corresponding to thecritical, peak and onset of steady state region were related to the Zener-Hollomon parameter usingsimple power equations. The variation of dynamic recrystallization fraction with strain showedthat restoration kinetics is enhanced with increasing the temperature and decreasing the strain rate.The development of DRX was modeled using Avrami Kinetics equation. The equations proposedby Baragar and Cingara-McQueen were used to develop a new model capable of predicting theflow curves up to the onset of steady state flow region. This softening work is mainly controlledby the phenomenon of dynamic recrystallization.

Martensitic-stainless steel, Dynamic recrystallization, Hot deformation, Recrystallization kinetics