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Modelling of microporosity formation in aluminium alloy castings

Identifieur interne : 000543 ( France/Analysis ); précédent : 000542; suivant : 000544

Modelling of microporosity formation in aluminium alloy castings

Auteurs : H. Combeau [France] ; D. Carpentier ; J. Lacaze ; G. Lesoult

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Mots-clés :

Abstract

The solidification of Al-7wt.%Si alloy in sand mold geometries has been simulated using a 2D-finite volumes model which takes full account of coupled heat, mass and momentum transport phenomena. The shrinkage boundary condition used in this model is detailed, and results of the simulation are presented in terms of pressure drops which are viewed sometimes as one of the major causes of micropore formation in aluminium castings. Solidification of plates of different thicknesses in sand mold has been investigated. Calculations give a maximum absolute pressure drop of 27 000 Pa in the 7.5 mm thick casting whereas this maximum is only 300 Pa in the 30 mm thick casting


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Pascal:94-0123128

Le document en format XML

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<term>Aluminium base alloys</term>
<term>Casting</term>
<term>Casting defect</term>
<term>Heat transfer</term>
<term>Mass transfer</term>
<term>Mathematical model</term>
<term>Microporosity</term>
<term>Molded piece</term>
<term>Sand mold</term>
<term>Segregation</term>
<term>Shrinkage</term>
<term>Silicon alloy</term>
<term>Solidification</term>
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<keywords scheme="Pascal" xml:lang="fr">
<term>Solidification</term>
<term>Coulée en moule</term>
<term>Défaut fonderie</term>
<term>Retrait</term>
<term>Moule sable</term>
<term>Ségrégation</term>
<term>Microporosité</term>
<term>Pièce moulée</term>
<term>Modèle mathématique</term>
<term>Transfert chaleur</term>
<term>Alliage base aluminium</term>
<term>Silicium alliage</term>
<term>Transfert masse</term>
<term>Alliage Al93Si7</term>
<term>Al Si</term>
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<div type="abstract" xml:lang="en">The solidification of Al-7wt.%Si alloy in sand mold geometries has been simulated using a 2D-finite volumes model which takes full account of coupled heat, mass and momentum transport phenomena. The shrinkage boundary condition used in this model is detailed, and results of the simulation are presented in terms of pressure drops which are viewed sometimes as one of the major causes of micropore formation in aluminium castings. Solidification of plates of different thicknesses in sand mold has been investigated. Calculations give a maximum absolute pressure drop of 27 000 Pa in the 7.5 mm thick casting whereas this maximum is only 300 Pa in the 30 mm thick casting</div>
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