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Heat-Transfer Coefficient and In-Cavity Pressure at the Casting-Die Interface during High-Pressure Die Casting of the Magnesium Alloy AZ91D

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Abstract

The present article deals with the application of a new measurement method to determine the heat-transfer coefficient (HTC) and the heat flux density at the casting-die interface during high-pressure die casting (HPDC) and solidification of the magnesium AZ91D alloy. The main measurements during the trial included velocity and the position of the piston that delivers the metal into the die, the pressure in the die cavity and at the tip of the piston, the alloy surface temperature, and the die temperature at different depths from the surface of the die. The temperature data were analyzed using an inverse method to determine the HTC at the casting-die interface during solidification. This article examines in detail the influence of the piston velocity and in-cavity pressure on heat transfer at the casting-die interface during casting and solidification of the magnesium AZ91D alloy.

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Notes

  1. The alloy surface temperature and the temperatures in the die at 20 mm from the surface are not shown in Figure 7 in order to simplify the figure and enable the different curves to be distinguished. They remain exactly as their measured values, as shown in Figure 5 and they are not involved in the inverse calculation.

Abbreviations

a :

thermal diffusivity (m2 s−1)

h, h max :

heat-transfer coefficient (W m−2 K−1)

q, q max :

heat flux density and its peak value (Wm−2)

ntf:

number of future instant (used in our inverse method) (—)

T :

temperature (°C)

T sd , T sc :

temperature of the surface of the die and of the casting (°C)

dz :

inaccuracy in location of the thermocouple (m)

λ :

thermal conductivity (W m−1 K−1)

ΔT :

temperature difference at the casting-die interface (°C)

\( \tau ^{ + }_{{TC}} \) :

normalized time response of the thermocouples (—)

τ :

duration of the heat input at the surface of the die (s)

τ TC :

time response of a thermocouple (s)

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Acknowledgments

The authors acknowledge the financial support of the CAST Cooperative Research Centre (CRC), Ferra Engineering, and the Ford Motor Company. The University of Queensland and CSIRO are core participants in the CAST CRC. This research is a collaboration between CAST and the Ecole des Mines d’Albi-Carmaux. The authors also thank Mr. Andy Yob and Ms. Maya Gershenzon for their assistance in performing the trial at the CSIRO.

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Authors and Affiliations

  1. Ecole des Mines d’Albi-Carmaux, CROMeP, Route de Teillet, 81 013, Albi Cedex 09, France

    A. Hamasaiid (Postdoctoral Student) & G. Dour (Associate Professor)

  2. CAST Cooperative Research Centre, School of Engineering, The University of Queensland, St. Lucia, Brisbane, QLD, 4072, Australia

    A. Hamasaiid (Postdoctoral Student) & M.S. Dargusch (Project Leader)

  3. Université Paul Sabatier, Route de Narbonne, 31062, Toulouse Cedex, France

    A. Hamasaiid (Postdoctoral Student)

  4. Institut Universitaire de Technologie de Lorient, 56100, Lorient, France

    T. Loulou (Professor)

  5. CSIRO Materials Science and Engineering, CAST CRC, Clayton South, 3169, Australia

    C. Davidson (Project Leader) & G. Savage (Program Manager)

Authors
  1. A. Hamasaiid
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  2. G. Dour
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  3. M.S. Dargusch
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  4. T. Loulou
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  5. C. Davidson
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  6. G. Savage
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Corresponding author

Correspondence to A. Hamasaiid.

Additional information

Manuscript submitted April 3, 2007.

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Hamasaiid, A., Dour, G., Dargusch, M. et al. Heat-Transfer Coefficient and In-Cavity Pressure at the Casting-Die Interface during High-Pressure Die Casting of the Magnesium Alloy AZ91D. Metall Mater Trans A 39, 853–864 (2008). https://doi.org/10.1007/s11661-007-9452-7

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