The effect of deformation temperature on the recrystallization behavior of AISI 304 stainless steel

This paper presents a study for constitutive equation over a wide range of temperatures (700 similar to 1100 degrees C) when AISI 304 stainless steel undergoes large strain. Dependency of flow stress upon strain rate and temperature, is described by the hyperbolic sine form of the Arrhenius equation. By modifying the Voce's equation, a constitutive equation for the steel was obtained. The material constants required in the proposed constitutive equation have been obtained by a series of hot torsion tests. Also, in this work, we propose no-dynamic recrystallization temperature (Tndrx) for AISI 304 stainless steel. The Tndrx of the steel is found to be about 855 degrees C, which can be obtained from continuous cooling torsion (CCT) curve and electron back-scattered diffraction (EBSD) analysis. Results revealed the proposed constitutive equations could predict flow stress softening due to dynamic recrystallization, with an acceptable amount of error, when the steel undergoes large strain at a wide range of temperatures.