Modeling of the Grain Refinement in Directionally Solidified Al-4.15 wt.% Mg Alloys using Cellular Automaton – Finite Element Approach

  1. Dipl.-Ing. K. Ehrke Chairman2 and
  2. Prof. Dr. W. Schneider3
  1. M. Vandyoussefi and
  2. A. L. Greer

Published Online: 21 APR 2006

DOI: 10.1002/3527607331.ch23

Continuous Casting

Continuous Casting

How to Cite

Vandyoussefi, M. and Greer, A. L. (2000) Modeling of the Grain Refinement in Directionally Solidified Al-4.15 wt.% Mg Alloys using Cellular Automaton – Finite Element Approach, in Continuous Casting (eds K. Ehrke and W. Schneider), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527607331.ch23

Editor Information

  1. 2

    ALUMINIUM Essen GmbH, Sulterkamp 71, D-45356 Essen, Germany

  2. 3

    VAW Aluminium AG, Forschung und Entwicklung, Georg-von-Boeselager-Str. 25, D-53117 Bonn, Germany

Author Information

  1. University of Cambridge, Cambridge, UK

Publication History

  1. Published Online: 21 APR 2006
  2. Published Print: 29 NOV 2000

ISBN Information

Print ISBN: 9783527302833

Online ISBN: 9783527607334

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Keywords:

  • continuous casting;
  • modeling;
  • grain refinement of Al-4.15 wt.% Mg alloys;
  • Cellular Automaton - Finite Element model

Summary

Grain refinement of Al-4.15 wt.% Mg alloys is studied using a 2-D CAFE (Cellular Automaton - Finite Element) model, in combination with Bridgman experiments. At low solidification rates and addition levels of grain refiners, short columnar grains, elongated and twinned grains were observed. Fully equiaxed dendrites were observed only at addition levels greater than conventionally used, and at higher solidification rates. Showing similar variations of grain size with processing parameters, both modeling and experimental results demonstrate that grain refinement is limited in the presence of a temperature gradient. A columnar/equiaxed transition (CET) map is calculated, indicating that the CET occurs progressively by varying solidification rate and temperature gradient. The microstructures observed in the samples inoculated with 2 and 5 ppt of Al-Ti-C refiner confirm this prediction.