Paper Titles
Segregation with Spongy Deformation of the Mushy Zone during Solidification of the Skin of Steel Cast Products
p.175
Influence of Forced Convection on Columnar Microstructure during Directional Solidification of Al - Ni Alloys
p.181
Macrosegregation Caused by Deformation of the Mushy Zone
p.187
Gravity-Induced Convection during Directional Solidification of Hypermonotectic Alloys
p.193
Solidification of AlSi Alloys in the ARTEMIS and ARTEX Facilities Including Rotating Magnetic Fields – A Combined Experimental and Numerical Analysis
p.199
Solidification and Melting – Asymmetries and Consequences
p.205
Motion of Fine Particles under Interfacial Tension Gradient in Relation to Solidification of Steel
p.211
Effect of Travelling Magnetic Field on the Directional Solidification of Refined Al-3.5 wt%Ni Alloys
p.221
Microstructure Formation in AlSi7 Alloys Directionally Solidified with Forced Melt Flow
p.227

Solidification of AlSi Alloys in the ARTEMIS and ARTEX Facilities Including Rotating Magnetic Fields – A Combined Experimental and Numerical Analysis

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Abstract:

The solidification microstructure is the consequence of a wide range of process parameters, like the growth velocity, the temperature gradient and the composition. Although the influence of these parameters is nowadays considerably well understood, an overall theory of the influence of convection on microstructural features is still lacking. The application of time dependent magnetic fields during directional solidification offers the possibility to create defined solidification and flow conditions. In this work, we report about solidification experiments in the ARTEMIS and ARTEX facilities including rotating magnetic fields (RMF). The effect of the forced melt flow on microstructural parameters like the primary and secondary dendrite arm spacing is analyzed for a wide range of magnetic field parameters. The experimental analysis is supported by a rigorous application of numerical modeling. An important issue is hereby the prediction of the resulting macrosegregation, i.e., differences in the composition on the scale of the sample (macroscale) due to the RMF. For the considered configuration and parameters an axial enrichment of Si is found beyond a certain magnetic field strength. The results are compared to available theories and their applicability is discussed.

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Periodical:

Materials Science Forum (Volume 508)

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199-204

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.508.199

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Online since:

March 2006

Authors:

Marc Hainke, Sonja Steinbach, Johannes Dagner, Lorenz Ratke, Georg Müller

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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