University of Oulu

Ghosh, S., Somani, M.C., Setman, D. et al. Hot Deformation Characteristic and Strain Dependent Constitutive Flow Stress Modelling of Ti + Nb Stabilized Interstitial Free Steel. Met. Mater. Int. (2020). https://doi.org/10.1007/s12540-020-00827-1

Hot deformation characteristic and strain dependent constitutive flow stress modelling of Ti + Nb stabilized interstitial free steel

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Author: Ghosh, Sumit1,2; Somani, Mahesh Chandra1; Setman, Daria3;
Organizations: 1Materials and Mechanical Engineering, Centre for Advanced Steels Research, University of Oulu, P.O. Box 4200, 90014, Oulu, Finland
2Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, Uttarakhand, 247667, India
3Faculty of Physics, Physics of Nanostructured Materials, University of Vienna, Boltzmanngasse 5, 1090, Vienna, Austria
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.2 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2020082061162
Language: English
Published: Springer Nature, 2020
Publish Date: 2020-08-20
Description:

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 °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 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 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.

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Series: Metals and materials international
ISSN: 1598-9623
ISSN-E: 2005-4149
ISSN-L: 1598-9623
Issue: Online first
DOI: 10.1007/s12540-020-00827-1
OADOI: https://oadoi.org/10.1007/s12540-020-00827-1
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Subjects:
Funding: Open access funding provided by University of Oulu. Authors sincerely acknowledge the Tata Steel Ltd.; Jamshedpur, India for providing the materials for the present research work. Authors are also grateful to the Metallurgical and Materials Engineering Department, Indian Institute of Technology, Roorkee, India for providing all the research facilities to carry out the present research work. SG and MCS also express their gratitude to the Academy of Finland to provide resources under the auspices of the Genome of Steel (Profi3) Project #311934.
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