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Thermodynamics of stable and metastable structures in Fe-C system
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.ORCID iD: 0000-0001-5031-919X
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.ORCID iD: 0000-0002-4521-6089
2014 (English)In: Calphad, ISSN 0364-5916, E-ISSN 1873-2984, Vol. 46, 148-158 p.Article in journal (Refereed) Published
Abstract [en]

The thermodynamic properties and the phase diagram of the Fe-C system are reviewed by means of the CALPHAD method and Gibbs energy functions valid from 0 K upwards are presented. The Fe-C system has been evaluated previously by Gustafson. The information on thermodynamic properties and phase equilibria have now been updated and used as a basis to re-optimize the model parameters. In addition, thermodynamic properties of metastable cementite, Hagg and eta carbides are evaluated on the basis of available experimental data and taking into account the magnetic nature of these carbides. Moreover, a model is proposed for carbon ordering phenomena in martensite. Structural changes during early stages of aging of martensite are described using the proposed model and tempering equilibria with cementite, Hagg, and eta carbides are well reproduced. It should also been mentioned that the present description represents experimental data on the equilibrium with the liquid better than Gustafson's thermodynamic description.

Place, publisher, year, edition, pages
2014. Vol. 46, 148-158 p.
Keyword [en]
Atomic ordering, CALPHAD, Martensite, Carbides, Spinodal decomposition
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-150909DOI: 10.1016/j.calphad.2014.03.004ISI: 000340325700016Scopus ID: 2-s2.0-84898655170OAI: oai:DiVA.org:kth-150909DiVA: diva2:746759
Funder
Vinnova, 2012-02892
Note

QC 20140915

Available from: 2014-09-15 Created: 2014-09-11 Last updated: 2017-12-05Bibliographically approved

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Selleby, Malin

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