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The Influence of In-Cavity Pressure on Heat Transfer and Porosity Formation During High-Pressure Die Casting of A380 Alloy

Abstract : This paper is concerned with the measurement of thermal properties and in-cavity pressures in cold chamber high-pressure die casting. The influence of in-cavity pressure on the casting porosity, heat flux, and heat transfer coefficient has been investigated during die casting of an A380 alloy. The die was instrumented with heat transfer and pressure sensors to measure these values directly. Direct measurement of the in-cavity pressure was found to be more reliable than the metal pressure calculated from pressure measurements in the hydraulic system. Variations on the intensification pressure directly affect the in-cavity pressure. Changing the intensification pressure between 17 MPa and 90 MPa had little effect on the heat flux and heat transfer which likely reach saturation at a lower pressure during the rapid filling stages. Increases in intensification pressure reduced the level of porosity within the castings, being most effective up to a value of 67.4 MPa.
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https://hal-mines-albi.archives-ouvertes.fr/hal-02933150
Contributor : Imt Mines Albi Ecole Nationale Supérieure Des Mines d'Albi-Carmaux <>
Submitted on : Tuesday, September 8, 2020 - 11:01:56 AM
Last modification on : Wednesday, September 16, 2020 - 9:57:16 AM

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M.S. Dargusch, A. Hamasaaid, Gilles Dour, N Balasubramani, D. h. Stjohn. The Influence of In-Cavity Pressure on Heat Transfer and Porosity Formation During High-Pressure Die Casting of A380 Alloy. JOM Journal of the Minerals, Metals and Materials Society, Springer Verlag (Germany), In press, ⟨10.1007/s11837-020-04341-y⟩. ⟨hal-02933150⟩

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