University of Oulu

M C Somani et al 2019 J. Phys.: Conf. Ser. 1270 012025

On the recrystallization characteristics and kinetics of two high-Si DQ&P steels

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Author: Somani, M C1; Porter, D A1; Karjalainen, L P1;
Organizations: 1Materials and Mechanical Engineering, Centre for Advanced Steels Research, University of Oulu, 90014 Oulun yliopisto, Finland
2Dept. of Metallurgical, Materials and Biomedical Engineering, University of Texas at El Paso, El Paso, TX 79968, USA
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.4 MB)
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Language: English
Published: IOP Publishing, 2019
Publish Date: 2019-08-22


In the direct quenching and partitioning (DQ&P) process to develop tough, ultrahigh-strength steel, the hot rolling stage involving deformation and recrystallization between successive passes affects the state of the austenite prior to the quenching and partitioning step. Therefore, in order to design appropriate thermo-mechanically controlled rolling processes, the recrystallization characteristics of two experimental high-Si DQ&P steels, with compositions (in wt.%) 0.3C-1Si-2Mn-1Cr and 0.25C-1.5Si-3Mn, were determined using the stress relaxation technique on a Gleeble thermomechanical simulator and modelled in terms of the effects of temperature, strain, strain rate and initial grain size. Data analysis resulted in the estimation of the powers of strain (-2.8 and -2.4) and strain rate (-0.23 and -0.14) and the recrystallization activation energies (303 and 289 kJ/mol) for the 0.3C-1Si-2Mn-1Cr and 0.25C-1.5Si-3Mn steels, respectively. This suggests that increasing the contents of Mn and Si made the recrystallization kinetics less sensitive to strain, strain rate and temperature. New regression equations derived to describe the recrystallization kinetics can be used in the design of the rough rolling part of thermomechanical processing.

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Series: Journal of physics. Conference series
ISSN: 1742-6588
ISSN-E: 1742-6596
ISSN-L: 1742-6588
Volume: 1270
Issue: 1
Article number: 12025
DOI: 10.1088/1742-6596/1270/1/012025
Host publication: 7th International Conference on Recrystallization and Grain Growth, 4–9 August 2019, Ghent, Belgium
Host publication editor: Kestens, Leo A.I.
Pirgazi, Hadi
Minh, Tuan Nguyen
Petrov, Roumen H.
Conference: International Conference on Recrystallization and Grain Growth
Type of Publication: A4 Article in conference proceedings
Field of Science: 216 Materials engineering
Funding: The funding of this research activity through the RFCS Grant Agreement RFSR-CT-2014-00019 is gratefully acknowledged.
Copyright information: © Copyright 2019 IOP Publishing. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under licence by IOP Publishing Ltd.