Flow stress and critical dynamic recrystallization behavior of Cu-Fe16Mn0.6C high manganese TWIP steel

Abstract

The true stress-strain curve of Cu-Fe16Mn0.6C twinning induced plasticity (TWIP) steel was studied with a compression test on Thermecmastor-Z thermal simulator at a temperature range of 850-1150°C and strain rate range of 0.03-30s -1. The influence of deformation temperature and strain rate on high-temperature flow stress and critical recrystallization behavior of the TWIP steel was investigated. It is concluded that the peak flow stress of Cu-Fe16Mn0.6C under high-temperature deformation decreases as the temperature increases but increases with the strain rate. Meanwhile at strain rate of 0.03 and 30s -1 obvious peak stresses are observed which demonstrates the dynamic recrystallization. The constitutive equation of Cu-Fe16Mn0.6C under high temperature deformation is calculated by linear regression method. The activation energy is 505kJmol -1. The relationship between critical strain of dynamic revrystallization and Zener-Hollomon parameter is determined by the curve between strain-hardening rate and flow stress. The true stress-strain curve of Cu-Fe16Mn0.6C TWIP steel was studied with a compression test on Thermecmastor-Z thermal simulator at a temperature range of 850-1150°C and strain rate range of 0.03-30s -1. The influence of deformation temperature and strain rate on high-temperature flow stress and critical recrystallization behavior of the TWIP steel was investigated. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.