Rodriguez-Galeano, K.F. orcid.org/0000-0002-1797-3525, Nutter, J., Azakli, Y. orcid.org/0000-0002-3175-8565 et al. (2 more authors) (2024) Influence of Cr and Cr+Nb on the interphase precipitation and mechanical properties of V–Mo microalloyed steels. Materials Science and Engineering: A, 893. 146140. ISSN: 0921-5093
Abstract
There has been much research on steels strengthened by interphase precipitation, but the role of Cr remains unclear. Isothermal transformations have been performed at different temperatures to investigate the effect of Cr and Cr + Nb additions on the interphase precipitation resulting from the austenite-to-ferrite transformations in V–Mo based dual phase steels. Optical microscopy (OM) plus transmission electron microscopy (TEM) and tensile testing were used to characterize and correlate microstructural evolution to the tensile properties and the interphase precipitation formed during the austenite to ferrite (γ→α) transformation. It was found that an addition of 0.5 wt% Cr to V–Mo microalloyed steel accelerates the transformation rate of ferrite, producing a higher volume fraction of ferrite. Importantly, the addition of Cr reduces the diameter of the interphase precipitates giving an important contribution to the yield strength. A further addition of 0.03 wt% Nb to the Cr–V–Mo reduces the contribution made by the interphase precipitation and increased the grain refined contribution. A new method was used to calculate the volume fraction of interphase precipitation with TEM images from extraction replicas is presented and included in a root-mean-square model which includes the precipitation hardening made by IP on microalloyed DP steels to effectively predict their yield strength.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2024 The Authors. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
Keywords: | Engineering; Materials Engineering |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > School of Chemical, Materials and Biological Engineering |
Funding Information: | Funder Grant number Engineering and Physical Sciences Research Council EP/S019367/1 Engineering and Physical Sciences Research Council EP/R00661X/1 Engineering and Physical Sciences Research Council EP/P02470X/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/V001809/1 Engineering and Physical Sciences Research Council EP/S018107/1 |
Date Deposited: | 30 Sep 2025 15:42 |
Last Modified: | 30 Sep 2025 15:44 |
Status: | Published |
Publisher: | Elsevier BV |
Refereed: | Yes |
Identification Number: | 10.1016/j.msea.2024.146140 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:232384 |