Numéro
J. Phys. IV France
Volume 120, December 2004
Page(s) 79 - 84
DOI http://dx.doi.org/10.1051/jp4:2004120008


J. Phys. IV France 120 (2004) 79-84

DOI: 10.1051/jp4:2004120008

Motion of diffusional transformation fronts in multi-component systems

E. Gamsjäger1, 2, F.D. Fischer3, 4 and J. Svoboda5

1  Institut für Mechanik, Montanuniversität Leoben, Franz-Josef-Straße 18 ,8700 Leoben, Austria
2  Christian Doppler Laboratory Functionally Oriented Material Design
3  Institut für Mechanik, Montanuniversität Leoben, Franz-Josef-Straße 18 ,8700 Leoben, Austria
4  Erich Schmid Institute for Materials Science, Austrian Academy of Sciences, Jahnstraße 12, 8700 Leoben, Austria
5  Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Zizkova 22, 616 62 Brno, Czech Republic

e.gamsjaeger@unileoben.ac.at
fischer@unileoben.ac.at
svobj@ipm.cz

Abstract
The material properties of a steel slab produced during continuous casting are significantly influenced by the kinetics of the austenite($\gamma$)-to-ferrite($\alpha$) phase transformation. Former theoretical models either have used a semi-empirical approach (such as the Johnson-Mehl-Avrami equation) or simplified the situation by assuming an infinite mobility of the phase interface and/or zero mobility of substitutionally dissolved components. In general the transformation kinetics in a multi-component system depends on the interface mobility and on the diffusion of the components. A finite mobility model for the phase transformation has been developed that takes into account the diffusion of substitutionally dissolved components. As an example the kinetics of the $\gamma$/$\alpha$-phase transformation is simulated in the Fe-Cr-Ni system.



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