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International Journal of Forming Processes
1292-7775
Publication suspended
 

 ARTICLE VOL 4/3-4 - 2001  - pp.551-572  - doi:10.3166/ijfp.4.551-572
TITLE
Austenite-to-Ferrite Phase Transformation during Continuous Casting of Steels

ABSTRACT

During the continuous casting process of carbon steels the solidified shell has to sustain thermal stresses as well as mechanical loading conditions (unbending) when trans-forming from austenite to ferrite between the Ar3 - and the Ar1 -temperature. Microme-chanical models have been developed in order to investigate the influence of different g/a arrangements on the stress/strain situation in the particular composite. When thin ferritic films surround the inclusion-like austenitic grains a strain concentration has been observed that gives rise to inter-crystalline fracture. In order to consider microstructural variations, g-a transformation kinetics is investigated numerically. Carbon diffusion and interface migra-tion, coupled by appropriate boundary conditions, determine the austenite to ferrite trans-formation. The results can be plotted in the form of TTT-diagrams. Additionally, a Finite Element model has been performed in order to investigate the influence of a uniaxially ap-plied load on the transformation kinetics. This paper presents the results of two years’ work on micromechanical modelling of the proeutectoid g- a phase transformation.

AUTEUR(S)
Ernst GAMSJÄGER, Franz Dieter FISCHER, Christian M. CHIMANI, Jiri SVOBODA

Reçu le 8 août 2001.   

KEYWORDS
Fe-C system, ferrite, austenite, diffusional phase transformation, driving force, kinetics.

LANGUE DE L'ARTICLE
Anglais

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