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Modelling of microporosity formation in aluminium alloy castings

Identifieur interne : 001C49 ( PascalFrancis/Checkpoint ); précédent : 001C48; suivant : 001C50

Modelling of microporosity formation in aluminium alloy castings

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

Source :

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

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<title xml:lang="en" level="a">Modelling of microporosity formation in aluminium alloy castings</title>
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<name sortKey="Combeau, H" sort="Combeau, H" uniqKey="Combeau H" first="H." last="Combeau">H. Combeau</name>
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<name sortKey="Carpentier, D" sort="Carpentier, D" uniqKey="Carpentier D" first="D." last="Carpentier">D. Carpentier</name>
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<name sortKey="Lacaze, J" sort="Lacaze, J" uniqKey="Lacaze J" first="J." last="Lacaze">J. Lacaze</name>
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<name sortKey="Lesoult, G" sort="Lesoult, G" uniqKey="Lesoult G" first="G." last="Lesoult">G. Lesoult</name>
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<name sortKey="Lacaze, J" sort="Lacaze, J" uniqKey="Lacaze J" first="J." last="Lacaze">J. Lacaze</name>
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<keywords scheme="KwdEn" xml:lang="en">
<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>
</keywords>
<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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<s0>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</s0>
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</fC02>
<fC03 i1="01" i2="X" l="FRE">
<s0>Solidification</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="ENG">
<s0>Solidification</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="GER">
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<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="SPA">
<s0>Solidificación</s0>
<s5>01</s5>
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<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="ENG">
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<s5>02</s5>
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<s5>02</s5>
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<s0>Colada molde</s0>
<s5>02</s5>
</fC03>
<fC03 i1="03" i2="X" l="FRE">
<s0>Défaut fonderie</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="ENG">
<s0>Casting defect</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="GER">
<s0>Gussfehler</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="SPA">
<s0>Defecto fundición</s0>
<s5>03</s5>
</fC03>
<fC03 i1="04" i2="X" l="FRE">
<s0>Retrait</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="ENG">
<s0>Shrinkage</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="GER">
<s0>Schrumpfung</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="SPA">
<s0>Retiro</s0>
<s5>04</s5>
</fC03>
<fC03 i1="05" i2="X" l="FRE">
<s0>Moule sable</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="ENG">
<s0>Sand mold</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="GER">
<s0>Sandform</s0>
<s5>05</s5>
</fC03>
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<s0>Molde arena</s0>
<s5>05</s5>
</fC03>
<fC03 i1="06" i2="X" l="FRE">
<s0>Ségrégation</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="ENG">
<s0>Segregation</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="GER">
<s0>Seigerung</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="SPA">
<s0>Segregación</s0>
<s5>06</s5>
</fC03>
<fC03 i1="07" i2="X" l="FRE">
<s0>Microporosité</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="ENG">
<s0>Microporosity</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="GER">
<s0>Microporositaet</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="SPA">
<s0>Microporosidad</s0>
<s5>07</s5>
</fC03>
<fC03 i1="08" i2="X" l="FRE">
<s0>Pièce moulée</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="ENG">
<s0>Molded piece</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="GER">
<s0>Gussstueck</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="SPA">
<s0>Pieza moldeada</s0>
<s5>08</s5>
</fC03>
<fC03 i1="09" i2="X" l="FRE">
<s0>Modèle mathématique</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="X" l="ENG">
<s0>Mathematical model</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="X" l="GER">
<s0>Mathematisches Modell</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="X" l="SPA">
<s0>Modelo matemático</s0>
<s5>09</s5>
</fC03>
<fC03 i1="10" i2="X" l="FRE">
<s0>Transfert chaleur</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="ENG">
<s0>Heat transfer</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="GER">
<s0>Waermeuebertragung</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="SPA">
<s0>Transferencia térmica</s0>
<s5>10</s5>
</fC03>
<fC03 i1="11" i2="3" l="FRE">
<s0>Alliage base aluminium</s0>
<s2>NK</s2>
<s5>11</s5>
</fC03>
<fC03 i1="11" i2="3" l="ENG">
<s0>Aluminium base alloys</s0>
<s2>NK</s2>
<s5>11</s5>
</fC03>
<fC03 i1="12" i2="X" l="FRE">
<s0>Silicium alliage</s0>
<s5>12</s5>
</fC03>
<fC03 i1="12" i2="X" l="ENG">
<s0>Silicon alloy</s0>
<s5>12</s5>
</fC03>
<fC03 i1="12" i2="X" l="GER">
<s0>Siliciumlegierung</s0>
<s5>12</s5>
</fC03>
<fC03 i1="12" i2="X" l="SPA">
<s0>Silicio aleación</s0>
<s5>12</s5>
</fC03>
<fC03 i1="13" i2="X" l="FRE">
<s0>Transfert masse</s0>
<s5>23</s5>
</fC03>
<fC03 i1="13" i2="X" l="ENG">
<s0>Mass transfer</s0>
<s5>23</s5>
</fC03>
<fC03 i1="13" i2="X" l="GER">
<s0>Stoffuebergang</s0>
<s5>23</s5>
</fC03>
<fC03 i1="13" i2="X" l="SPA">
<s0>Transferencia masa</s0>
<s5>23</s5>
</fC03>
<fC03 i1="14" i2="X" l="FRE">
<s0>Alliage Al93Si7</s0>
<s2>NK</s2>
<s4>INC</s4>
<s5>32</s5>
</fC03>
<fC03 i1="15" i2="X" l="FRE">
<s0>Al Si</s0>
<s4>INC</s4>
<s5>33</s5>
</fC03>
<fN21>
<s1>055</s1>
</fN21>
</pA>
<pR>
<fA30 i1="01" i2="1" l="ENG">
<s1>European Materials Research Society EMRS. Spring symposium F</s1>
<s3>Strasbourg FRA</s3>
<s4>1993-05-04</s4>
</fA30>
</pR>
</standard>
</inist>
<affiliations>
<list>
<country>
<li>France</li>
</country>
<region>
<li>Alsace-Champagne-Ardenne-Lorraine</li>
<li>Lorraine</li>
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<li>Nancy</li>
</settlement>
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<tree>
<noCountry>
<name sortKey="Carpentier, D" sort="Carpentier, D" uniqKey="Carpentier D" first="D." last="Carpentier">D. Carpentier</name>
<name sortKey="Lacaze, J" sort="Lacaze, J" uniqKey="Lacaze J" first="J." last="Lacaze">J. Lacaze</name>
<name sortKey="Lesoult, G" sort="Lesoult, G" uniqKey="Lesoult G" first="G." last="Lesoult">G. Lesoult</name>
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