Abbasi, E. and Rainforth, W.M. orcid.org/0000-0003-3898-0318 (2017) Microstructural Evolution of Nb-V-Mo and V Containing TRIP assisted Steels during Thermomechanical Processing. Journal of Materials Science and Technology, 33 (4). pp. 311-320. ISSN 1005-0302
Abstract
The microstructural evolution and precipitation behaviour of Nb-V-Mo and single V containing transformation induced plasticity assisted steels were investigated during thermomechanical processing. A plane strain compression testing machine was used to simulate the thermomechanical processing. Microstructures were characterised by optical microscopy, scanning-transmission electron microscopy and microanalysis, and X-ray diffraction analysis, and Vickers hardness was obtained from the deformed specimens. The resulting microstructure of both Nb-V-Mo and V steels at room temperature primarily consisted of an acicular/bainitic ferrite, retained austenite and martensite surrounded by allotriomorphic ferrite. The TEM analysis showed that a significant number of Nb(V,Mo)(C,N) precipitates were formed in the microstructure down to the finishing stage in Nb-V-Mo steel (i.e. 830 °C). It was also found that the V(C,N) precipitation primarily occurred in both ferrite and deformed austenite below the finishing stage. The results suggested that Nb-Mo additions considerably increased the temperature stability of microalloy precipitates and controlled the microstructural evolution of austenite. However, the microalloy precipitation did not cause a significant precipitation strengthening in both Nb-V-Mo and V steels at room temperature.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 Elsevier Ltd. This is an author produced version of a paper subsequently published in Journal of Materials Science & Technology. Uploaded in accordance with the publisher's self-archiving policy. Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/) |
Keywords: | Microalloyed TRIP-assisted steel; Thermomechanical processing; Precipitation behavior; Microstructural evolution |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Funding Information: | Funder Grant number ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/L025213/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 19 Sep 2016 08:46 |
Last Modified: | 30 Aug 2017 00:30 |
Published Version: | http://dx.doi.org/10.1016/j.jmst.2016.08.019 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.jmst.2016.08.019 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:104768 |