Gibbs energy minimisation model for the austenite-ferrite phase transformation in Fe-C-X-Y alloys

A new model has been developed to predict austenite ferrite transformation kinetics in steels. For each alloying element, the concentration profile is computed solving a unique diffusion equation (including the 2 phases and the interface). The interface is described assuming linear variation of chem...

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Bibliographic Details
Published inPhilosophical magazine letters Vol. 101; no. 6; pp. 232 - 241
Main Authors Mathevon, Alexandre, Perez, Michel, Massardier, Véronique, Fabrègue, Damien, Chantrenne, Patrice, Rocabois, Philippe
Format Journal Article
LanguageEnglish
French
German
Published Abingdon Taylor & Francis 03.06.2021
Taylor & Francis Ltd
Subjects
Alloying elements
Austenite
Computing time
Decarburization
Equilibrium
Ferrite
Gibbs energy minimisation
Manganese
Modeling
Optimization
phase transformation kinetics
Phase transitions
Quaternary systems
steels
Thermodynamic equilibrium
thermodynamics
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Summary:A new model has been developed to predict austenite ferrite transformation kinetics in steels. For each alloying element, the concentration profile is computed solving a unique diffusion equation (including the 2 phases and the interface). The interface is described assuming linear variation of chemical potentials, saving thus computational time. Interface motion is driven by the minimisation of Gibbs energy. The model naturally reproduces the transition between thermodynamic equilibria (Para equilibrium, Local equilibrium with negligible partitioning, Local equilibrium) during heating. The validity of the model for reverse transformation has been validated on ternary and quaternary systems Fe-C-(Mn-Si-Mo) on decarburisation experiments.
ISSN:0950-0839
1362-3036
DOI:10.1080/09500839.2021.1909166