University of Oulu

Vahid Javaheri, Nasseh Khodaie, Antti Kaijalainen, David Porter, Effect of niobium and phase transformation temperature on the microstructure and texture of a novel 0.40% C thermomechanically processed steel, Materials Characterization, Volume 142, 2018, Pages 295-308, ISSN 1044-5803, https://doi.org/10.1016/j.matchar.2018.05.056

Effect of niobium and phase transformation temperature on the microstructure and texture of a novel 0.40% C thermomechanically processed steel

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Author: Javaheri, Vahid1; Khodaie, Nasseh2; Kaijalainen, Antti1;
Organizations: 1Materials and Production Engineering Unit, Faculty of Technology, University of Oulu, Finland
2Department of Chemical and Materials Engineering, University of Alberta, Canada
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 7.9 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2018061325821
Language: English
Published: Elsevier, 2018
Publish Date: 2018-06-13
Description:

Abstract

Field emission scanning electron microscopy, electron backscatter diffraction (EBSD) and X-ray diffraction (XRD) have been employed to investigate the effect of niobium and phase transformation temperature on the evolution of microstructure and texture in a novel thermomechanically processed, medium‑carbon, low-alloy steel intended for slurry pipeline applications. Thermomechanical processing consisted of hot-rolling in the austenitic region with deformation both above the recrystallization limit temperature and below the recrystallization stop temperature. Immediately after rolling, specimens were directly quenched in water to two different temperatures of 560 °C and 420 °C and subsequently furnace cooled from those temperatures to simulate the cooling of coiled strip on a hot strip mill. The microstructure of samples quenched to 560 °C mostly comprised of upper bainite, whereas the samples quenched to 420 °C mainly consisted of lath-type lower bainite. The transformation texture of all samples at the mid-thickness position consisted of α, γ and ε-fibers with high intensities close to the transformed copper, transformed brass and rotated cube components. The addition of 0.013 wt% Nb refined the microstructure and sharpened the texture. The texture of the small fraction of retained austenite present in the final microstructures indicated that the main bcc texture components result from the brass and copper components in the parent austenite.

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Series: Materials characterization
ISSN: 1044-5803
ISSN-E: 1873-4189
ISSN-L: 1044-5803
Volume: 142
Pages: 295 - 308
DOI: 10.1016/j.matchar.2018.05.056
OADOI: https://oadoi.org/10.1016/j.matchar.2018.05.056
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Subjects:
Funding: The authors are grateful for financial support from the European Commission under grant number 675715 – MIMESIS – H2020-MSCA-ITN-2015, which is a part of the Marie Sklodowska-Curie Innovative Training Networks European Industrial Doctorate programme.
EU Grant Number: (675715) MIMESIS - Mathematics and Materials Science for Steel Production and Manufacturing
Copyright information: © 2018 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/BY-NC-ND/4.0/).
  https://creativecommons.org/licenses/by-nc-nd/4.0/