Hot Deformation Characteristic and Strain Dependent Constitutive Flow Stress Modelling of Ti + Nb Stabilized Interstitial Free Steel
- Author(s)
- Sumit Ghosh, Mahesh Chandra Somani, Daria Setman, Suhrit Mula
- Abstract
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 a temperature range of 650-1100 degrees C and at constant true strain rates in the range 10(-3)-10 s(-1), to a total true strain of 0.7. The flow stress curves can be categorized into two distinct types, i.e. with/without the presence of steady-state flow following peak stress behavior. A novel constitutive model comprising the strain effect on the activation energy of DRX and other material constants has been established to predict the constitutive flow behavior of the IF steel in both alpha and gamma phase regions, separately. Predicted flow stress seems to correlate well with the experimental data both in gamma and alpha phase regions with a high 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 with the modelled equations suggests that dislocation glide controlled by dislocation climb is the dominant mechanism for the DRX, as confirmed by the transmission electron microscopy analysis. Graphic
- Organisation(s)
- Physics of Nanostructured Materials
- External organisation(s)
- University of Oulu, Indian Institute of Technology Roorkee
- Journal
- Metals and Materials International
- Volume
- 27
- Pages
- 2481–2498
- No. of pages
- 18
- ISSN
- 1598-9623
- DOI
- https://doi.org/10.1007/s12540-020-00827-1
- Publication date
- 08-2020
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103018 Materials physics
- Keywords
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/hot-deformation-characteristic-and-strain-dependent-constitutive-flow-stress-modelling-of-ti--nb-stabilized-interstitial-free-steel(8c00d750-9dba-4b8a-97e1-9617be996950).html