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A phase-field method coupled with CALPHAD for the simulation of ordered κ-carbide precipitates in both disordred γ and α phases in low density steel
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Rahnama, Alireza, Dashwood, R. J. and Sridhar, Seetharaman (2017) A phase-field method coupled with CALPHAD for the simulation of ordered κ-carbide precipitates in both disordred γ and α phases in low density steel. Computational Materials Science, 126 . pp. 152-159. ISSN 0927-0256.
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Official URL: http://dx.doi.org/10.1016/j.commatsci.2016.09.015
Abstract
In order to simulate multi-component diffusion controlled precipitation of ordered phases in low density steels using the phase-field method, the Gibbs free energy of the γ, α and κ phases in the quaternary Fe-Mn-Al-C system was linked to the CALPHAD method using a three-sublattice model which is based on the accumulation of considerable thermodynamic data in multi-component systems and the assurance of continuous variation of the interface area. This model includes the coherent precipitation of κ phase from a disordered FCC γ phase and semi-coherent precipitation of the same κ phase from a disordered BCC α structure. The microstructure evolution of κ- carbide was simulated with three-dimensional phase-field model. The simulation was first performed for a single particle in both γ and α phases to investigate the evolution of interfacial and elastic strain energy during the precipitation process. The simulation results show that κ has a cuboidal morphology in γ and elongated plate-like morphology in α which is in agreement with the morphologies reported in the literature. The multi-particle simulations were also performed for the precipitation of κ phase from both disordered γ and α. The results also demonstrate that the size of κ precipitates in γ is remarkably smaller than that in α phase.
Item Type: | Journal Article | ||||||||||
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Subjects: | T Technology > TN Mining engineering. Metallurgy T Technology > TS Manufactures |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||||
Library of Congress Subject Headings (LCSH): | Steel -- Density -- Mathematical models, Phase diagrams, Physical metallurgy | ||||||||||
Journal or Publication Title: | Computational Materials Science | ||||||||||
Publisher: | Elsevier Science BV | ||||||||||
ISSN: | 0927-0256 | ||||||||||
Official Date: | January 2017 | ||||||||||
Dates: |
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Volume: | 126 | ||||||||||
Page Range: | pp. 152-159 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Date of first compliant deposit: | 13 September 2016 | ||||||||||
Date of first compliant Open Access: | 3 October 2016 | ||||||||||
Funder: | High Value Manufacturing Catapult, Tata Steel |
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