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Characterisation of precipitation and carbide coarsening in low carbon low alloy Q&T steels during the early stages of tempering
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Ju, Yulin, Goodall, Aimee, Strangwood, Martin and Davis, Claire (2018) Characterisation of precipitation and carbide coarsening in low carbon low alloy Q&T steels during the early stages of tempering. Materials Science and Engineering: A, 738 . pp. 174-189. doi:10.1016/j.msea.2018.09.044 ISSN 0921-5093.
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WRAP-characterisation-precipitation-carbide-coarsening-carbon-low-tempering-Davis-2018.pdf - Accepted Version - Requires a PDF viewer. Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0. Download (2273Kb) | Preview |
Official URL: http://dx.doi.org/10.1016/j.msea.2018.09.044
Abstract
In order to ensure that appropriate tempering conditions are used to obtain desired strength and toughness for low carbon low alloy quench and tempered (Q&T) steel plates in a range of thickness, it is desirable to be able to predict the effect of composition and tempering conditions (time and temperature) on the microstructure and hence the hardness evolution for these steels. In this paper, carbide precipitation and coarsening behaviour in three low carbon low alloy Q&T steels have been investigated during tempering at 600 °C up to 16 hours to determine the role of alloying additions of Mo, V, Cr and Si. It has been found that auto-tempering occurs during water quenching with ε’-carbide and cementite being present within the martensite laths for all three steels. In the Base steel, cementite becomes the stable second phase after 2 hours tempering and has an elliptical (sometimes spherical) shape, which coarsens with time during tempering from 2 h to 16 h. However, in the Base-Mo-V and Base-Cr-Mo-V-Si steels, elliptical and needle-shaped cementite (shown to contain Mn, Mo and Cr) both exist during tempering; furthermore, finer elliptical secondary Mo-V-rich carbides are observed after tempering for 4 h. The coarsening of cementite contributing to the softening process in the three steels has been quantified with, most significantly, the inter- and intra-lath carbides coarsening independently. Although fine secondary alloy carbides are observed after 4 hours tempering, they do not result in any noticeable secondary hardening peak in the Base-Mo-V and Base-Cr-Mo-V-Si steels.
Item Type: | Journal Article | ||||||||
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Subjects: | T Technology > TS Manufactures | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||
Library of Congress Subject Headings (LCSH): | Tempering, Plates, Iron and steel, Steel -- Heat treatment | ||||||||
Journal or Publication Title: | Materials Science and Engineering: A | ||||||||
Publisher: | Elsevier S.A. | ||||||||
ISSN: | 0921-5093 | ||||||||
Official Date: | 19 December 2018 | ||||||||
Dates: |
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Volume: | 738 | ||||||||
Page Range: | pp. 174-189 | ||||||||
DOI: | 10.1016/j.msea.2018.09.044 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 19 September 2018 | ||||||||
Date of first compliant Open Access: | 15 September 2019 | ||||||||
RIOXX Funder/Project Grant: |
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