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A Calphad assessment of Al–C–Fe system with the carbide modelled as an ordered form of the fcc phase

Connétable, Damien and Lacaze, Jacques and Maugis, Philippe and Sundman, Bo A Calphad assessment of Al–C–Fe system with the carbide modelled as an ordered form of the fcc phase. (2008) Calphad, vol. 32 (n° 2). pp. 361-370. ISSN 0364-5916

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Official URL: http://dx.doi.org/10.1016/j.calphad.2008.01.002

Abstract

As part of an extensive study devoted to the development of new high-Al steels, a CALPHAD-type assessment of the Al–Fe–C system has been carried out. In place of the usual cementite, these steels show precipitation of the so-called κ carbide that is an ordered form of austenite. Inconsistencies between the scarce experimental information in the Al–Fe–C system and extrapolations from the available Al–Fe and Al–C descriptions made it necessary to revise them. This has been done in part by using new ab initio calculations as well as phase diagram data. The κ carbide has been described as an ordered form of the fcc phase, with its Gibbs energy calculated as the sum of a disordered and an ordered contribution. The additional parameters needed to express the ordered part were evaluated using phase equilibria information and new ab initio data related to the κ carbide. With this approach, addition of new alloying elements, like Mn or Ni, for extrapolation to higher-order systems should be straightforward.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Calphad website : http://www.sciencedirect.com/science/journal/03645916
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > Arcelor Mittal Research (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By:Celine Cabaup

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