University of Oulu

Pashangeh, S., Ghasemi Banadkouki, S.S., Somani, M.C. and Kömi, J. (2022), Effect of Carbon Partitioning and Residual Compressive Stresses on the Lattice Strains of Retained Austenite During Quenching and Isothermal Bainitic Holding in a High-Silicon Medium-Carbon Steel. steel research int., 93: 2100463. https://doi.org/10.1002/srin.202100463. https://doi.org/10.1002/srin.202100463

Effect of carbon partitioning and residual compressive stresses on the lattice strains of retained austenite during quenching and isothermal bainitic holding in a high-silicon medium-carbon steel

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Author: Pashangeh, Shima1; Ghasemi Banadkouki, Seyyed Sadegh1; Somani, Mahesh Chandra2;
Organizations: 1Department of Mining and Metallurgical Engineering, Yazd University, University Blvd, Post Box 98195 – 741 Safayieh, Yazd, Iran
2Materials and Mechanical Engineering, Centre for Advanced Steels Research, University of Oulu, Post Box 4200, 90014 Oulu, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2022021819788
Language: English
Published: John Wiley & Sons, 2022
Publish Date: 2022-10-27
Description:

Abstract

The residual compressive stresses and dimensional changes related to the lattice strains of retained austenite (RA) phase in a high-Si, medium-carbon steel (Fe-0.53C-1.67Si-0.72Mn-0.12Cr) are investigated for samples austenitized and quenched for isothermal bainitic transformation (Q&B) in the range 5 s to 1 h at 350 °C. Also, samples are directly quenched in water (DWQ) from the austenitization temperature for comparison with Q&B samples. Field emission scanning electron microscopy (FE-SEM) combined with electron backscatter diffraction (EBSD) analyses, and X-ray diffraction are used to investigate the microstructural evolution, phase distribution, and lattice parameters of RA phase. While the Q&B samples showed formation of bainite and high-carbon fresh martensite in conjunction with stabilization of various fractions of RA, the DWQ samples displayed nearly complete martensitic microstructure. For short holding durations (≪200 s), there was limited formation of bainite and the inadequate carbon partitioning to the adjacent untransformed austenite areas resulted in significant martensite formation and the associated c/a ratio of martensite resulted in high compressive residual stresses within the RA phase. While, at long isothermal holding times (≫ 200 s), there was a significant formation of bainite. The DWQ samples displayed maximum lattice strain in a small fraction of untransformed RA phase.

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Series: Steel research international
ISSN: 1611-3683
ISSN-E: 1869-344X
ISSN-L: 1611-3683
Volume: 93
Issue: 4
Article number: 2100463
DOI: 10.1002/srin.202100463
OADOI: https://oadoi.org/10.1002/srin.202100463
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Subjects:
Funding: The funding of this research activity under the auspices of the Genome of Steel (Profi3) by the Academy of Finland through project #311934 is gratefully acknowledged. S.P. expresses her gratitude to the Ministry of Science Research and Technology in Iran for funding a research visit to the University of Oulu, Finland, to conduct this research work.
Copyright information: © 2021 Wiley-VCH GmbH. This is the peer reviewed version of the following article: Pashangeh, S., Ghasemi Banadkouki, S.S., Somani, M.C. and Kömi, J. (2022), Effect of Carbon Partitioning and Residual Compressive Stresses on the Lattice Strains of Retained Austenite During Quenching and Isothermal Bainitic Holding in a High-Silicon Medium-Carbon Steel. steel research int., 93: 2100463. https://doi.org/10.1002/srin.202100463, which has been published in final form at https://doi.org/10.1002/srin.202100463. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.