Casting/Mold Thermal Contact Heat Transfer during Solidification of Al-Cu-Si Alloy (LM 21) Plates in Thick and Thin Molds
Heat flow at the casting/mold interface was assessed and studied during solidification of Al-Cu-Si (LM 21) alloy in preheated cast iron molds of two different thicknesses, coated with graphite and alumina based dressings. The casting and the mold were instrumented with thermocouples connected to a c...
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Veröffentlicht in: | Journal of materials engineering and performance 2005-10, Vol.14 (5), p.604-609 |
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description | Heat flow at the casting/mold interface was assessed and studied during solidification of Al-Cu-Si (LM 21) alloy in preheated cast iron molds of two different thicknesses, coated with graphite and alumina based dressings. The casting and the mold were instrumented with thermocouples connected to a computer controlled temperature data acquisition system. The thermal history at nodal locations in the mold and casting obtained during experimentation was used to estimate the heat flux by solving the one-dimensional inverse heat conduction problem. The cooling rate and solidification time were measured using the computer-aided cooling curve analysis data. The estimated heat flux transients showed a peak due to the formation of a stable solid shell, which has a higher thermal conductivity compared with the liquid metal in contact with the mold wall prior to the occurrence of the peak. The high values of heat flux transients obtained with thin molds were attributed to mold distortion due to thermal stresses. For thin molds, assumption of Newtonian heating yielded reliable interfacial heat transfer coefficients as compared with one-dimensional inverse modeling. The time of occurrence of peak heat flux increased with a decrease in the mold wall thickness and increase in the casting thickness. |
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The casting and the mold were instrumented with thermocouples connected to a computer controlled temperature data acquisition system. The thermal history at nodal locations in the mold and casting obtained during experimentation was used to estimate the heat flux by solving the one-dimensional inverse heat conduction problem. The cooling rate and solidification time were measured using the computer-aided cooling curve analysis data. The estimated heat flux transients showed a peak due to the formation of a stable solid shell, which has a higher thermal conductivity compared with the liquid metal in contact with the mold wall prior to the occurrence of the peak. The high values of heat flux transients obtained with thin molds were attributed to mold distortion due to thermal stresses. For thin molds, assumption of Newtonian heating yielded reliable interfacial heat transfer coefficients as compared with one-dimensional inverse modeling. The time of occurrence of peak heat flux increased with a decrease in the mold wall thickness and increase in the casting thickness.</description><identifier>ISSN: 1059-9495</identifier><identifier>EISSN: 1544-1024</identifier><identifier>DOI: 10.1361/105994905X66015</identifier><identifier>CODEN: JMEPEG</identifier><language>eng</language><publisher>New York: Springer Nature B.V</publisher><subject>Alloy cast iron ; Alloy plating ; Contact ; Heat flux ; Heat transfer ; Inverse ; Molds ; Solidification</subject><ispartof>Journal of materials engineering and performance, 2005-10, Vol.14 (5), p.604-609</ispartof><rights>ASM International 2005</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c332t-7cff3a7f964ec79e1acebef898b628db9b366fd1e3b40f4b57cba7c199bbdba73</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Prabhu, K Narayan</creatorcontrib><creatorcontrib>Chowdary, Bheemappa</creatorcontrib><creatorcontrib>Venkataraman, N</creatorcontrib><title>Casting/Mold Thermal Contact Heat Transfer during Solidification of Al-Cu-Si Alloy (LM 21) Plates in Thick and Thin Molds</title><title>Journal of materials engineering and performance</title><description>Heat flow at the casting/mold interface was assessed and studied during solidification of Al-Cu-Si (LM 21) alloy in preheated cast iron molds of two different thicknesses, coated with graphite and alumina based dressings. 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The time of occurrence of peak heat flux increased with a decrease in the mold wall thickness and increase in the casting thickness.</description><subject>Alloy cast iron</subject><subject>Alloy plating</subject><subject>Contact</subject><subject>Heat flux</subject><subject>Heat transfer</subject><subject>Inverse</subject><subject>Molds</subject><subject>Solidification</subject><issn>1059-9495</issn><issn>1544-1024</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNp9kb1PHDEQxVdRkCBATWulQJdic57117o8rUhAulOQ7pDoVrbXTgy-Ndi7xf338QkqCqp5o_fTG41eVV0B_gmEwxIwk5JKzB45x8C-VGfAKK0BN_Rr0cWti81Oq285P2GMRdPQs-rQqTz58e9yE8OAdv9s2quAujhOykzo1qoJ7ZIas7MJDXMqJNrG4AfvvFGTjyOKDq1C3c311hcR4gEt1hvUwA90H9RkM_JjyfXmGanxeKGsx1v5ojpxKmR7-T7Pq4dfN7vutl7_-X3Xrda1IaSZamGcI0o4yak1QlpQxmrrWtlq3rSDlppw7gawRFPsqGbCaCUMSKn1UBQ5r67fcl9SfJ1tnvq9z8aGoEYb59w3rcCCcijg4lMQuABCoWGsoN8_oE9xTmN5o28F44IR4AVavkEmxZyTdf1L8nuVDj3g_lhZ_6Ey8h-v1Yfs</recordid><startdate>20051001</startdate><enddate>20051001</enddate><creator>Prabhu, K Narayan</creator><creator>Chowdary, Bheemappa</creator><creator>Venkataraman, N</creator><general>Springer Nature B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7XB</scope><scope>88I</scope><scope>8AF</scope><scope>8FE</scope><scope>8FG</scope><scope>8FK</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>GNUQQ</scope><scope>HCIFZ</scope><scope>KB.</scope><scope>L6V</scope><scope>M2P</scope><scope>M7S</scope><scope>PDBOC</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>Q9U</scope><scope>7QF</scope><scope>7SR</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>7SC</scope><scope>7TB</scope><scope>7U5</scope><scope>FR3</scope><scope>JQ2</scope><scope>L7M</scope><scope>L~C</scope><scope>L~D</scope></search><sort><creationdate>20051001</creationdate><title>Casting/Mold Thermal Contact Heat Transfer during Solidification of Al-Cu-Si Alloy (LM 21) Plates in Thick and Thin Molds</title><author>Prabhu, K Narayan ; 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The casting and the mold were instrumented with thermocouples connected to a computer controlled temperature data acquisition system. The thermal history at nodal locations in the mold and casting obtained during experimentation was used to estimate the heat flux by solving the one-dimensional inverse heat conduction problem. The cooling rate and solidification time were measured using the computer-aided cooling curve analysis data. The estimated heat flux transients showed a peak due to the formation of a stable solid shell, which has a higher thermal conductivity compared with the liquid metal in contact with the mold wall prior to the occurrence of the peak. The high values of heat flux transients obtained with thin molds were attributed to mold distortion due to thermal stresses. For thin molds, assumption of Newtonian heating yielded reliable interfacial heat transfer coefficients as compared with one-dimensional inverse modeling. 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subjects | Alloy cast iron Alloy plating Contact Heat flux Heat transfer Inverse Molds Solidification |
title | Casting/Mold Thermal Contact Heat Transfer during Solidification of Al-Cu-Si Alloy (LM 21) Plates in Thick and Thin Molds |
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