Metall. Res. Technol.
Volume 116, Number 6, 2019
|Number of page(s)||5|
|Published online||17 September 2019|
An original unified approach for the description of phase transformations in steel during cooling: first application to binary Fe–C
Laboratoire d’Étude des Microstructures et de Mécanique des Matériaux (LEM3), CNRS, Université de Lorraine, Arts et Métier Paris Tech,
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Accepted: 9 August 2019
Exploiting Landau’s theory of phase transformations, defining an original order parameter and using the phenomenological transformation temperatures, it is reported that it is possible to describe in a global approach the conditions for the formation of each constituent (ferrite, bainite, martensite) from austenite during cooling in steel. It allowed to propose a new rigorous classification of the different thermodynamic conditions controlling each phase transformation. In a second step, the approach predicts naturally the effect of cooling rate on the bainite start temperature. Finally, perspectives are assessed to extend the approach in order to take into account the effect of an external field such as applied stress.
Key words: phase transformation / steel / austenite / ferrite / bainite / martensite / Landau / order parameter
© O. Bouaziz, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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