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Sumit Ghosh,Mahesh Chandra Somani,Daria Setman,Suhrit Mula 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8
An effort has been made to establish a relation between Zener–Hollomon parameter, flow stress and dynamic recrystallization(DRX). In this context, the plastic flow behavior of Ti + Nb stabilized interstitial free (IF) steel was investigated in atemperature range of 650–1100 °C and at constant true strain rates in the range 10−3–10 s−1, to a total true strain of 0.7. Theflow stress curves can be categorized into two distinct types, i.e. with/without the presence of steady-state flow followingpeak stress behavior. A novel constitutive model comprising the strain effect on the activation energy of DRX and othermaterial constants has been established to predict the constitutive flow behavior of the IF steel in both α and γ phase regions,separately. Predicted flow stress seems to correlate well with the experimental data both in γ and α phase regions with ahigh correlation coefficient (0.982 and 0.936, respectively) and low average absolute relative error (7 and 11%, respectively)showing excellent fitting. A detailed analysis of the flow stress, activation energy of DRX and stress exponent in accord withthe modelled equations suggests that dislocation glide controlled by dislocation climb is the dominant mechanism for theDRX, as confirmed by the transmission electron microscopy analysis.
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