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New approach for modelling strain induced precipitation of Nb(C,N) in HSLA steels during multipass hot deformation in austenite

Nagarajan, V., Palmiere, E.J. and Sellars, C.M. (2009) New approach for modelling strain induced precipitation of Nb(C,N) in HSLA steels during multipass hot deformation in austenite. Materials Science and Technology, 25 (9). pp. 1168-1174. ISSN 0267-0836


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A new model for strain induced precipitation of Nb(C,N) is developed from the existing model for single pass hot deformation. This new model can be extended to multipass deformation to explain the microstructural evolution during the hot deformation of Nb supersaturated high strength low alloy (HSLA) steels. The key feature of this model is the microband geometry employed, which leads to determination of the local solute concentration at microbands, and hence the potential for carbonitride precipitation on the microbands. The model also validates the need for concurrent growth and coarsening processes, even at the early stages of precipitation. The evolution of the precipitate radius, number density and volume fraction are compared with the experimental results obtained from thin foil TEM micrographs on Fe-30 wt-%Ni alloys ( that are austenitic at room temperature and are similar to HSLA steels in deformation behaviour) subjected to deformation by plane strain compression. The model predictions are in good agreement with experimental results.

Item Type: Article
Copyright, Publisher and Additional Information: © 2009 Institute of Materials, Minerals and Mining. Published by Maney. Reproduced in accordance with the publisher's self-archiving policy.
Keywords: Strain induced precipitation; Modelling; Model austenite; Hot deformation; HSLA steels
Institution: The University of Sheffield
Academic Units: The University of Sheffield > University of Sheffield Research Centres and Institutes > Institute for Microstructural and Mechanical Process Engineering (Sheffield)
Depositing User: Miss Anthea Tucker
Date Deposited: 28 Sep 2009 11:46
Last Modified: 10 Jun 2014 05:55
Published Version: http://dx.doi.org/10.1179/174328409X455242
Status: Published
Publisher: Maney
Refereed: Yes
Identification Number: 10.1179/174328409X455242
URI: http://eprints.whiterose.ac.uk/id/eprint/9784

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