Die thermal behavior in machine casting of partially solid high temperature alloys View Full Text


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Article Info

DATE

1977-09

AUTHORS

D. G. Backman, R. Mehrabian, M. C. Flemings

ABSTRACT

Experimental measurements and computer simulations of die thermal behavior during machine (die) casting of fully liquid and partially solid bronze alloy 905 were carried out. Ingots of the alloy were heated to temperatures above the liquidus and in the liquidsolid range in a reheat furnace. The partially solidified charge was previously made in a continuous slurry producer. Castings were made in both a low pressure laboratory machine and a high pressure commercial die casting machine. In both casting machines used, the maximum die temperature and the initial rate of temperature change in the die, at ∼0.014 in. from the casting-die interface, were significantly lower when a partially solid charge material was used. For example, measured die temperatures in the high pressure commercial machine were 475°C and 165°C above the initial die temperature when the bronze alloy was cast in the 100°C superheated state and the partially solid (volume fraction solid ∼0.57) state, respectively. Correlation of computer predictions and measured die temperatures have been used to calculate values of the heat transfer coefficient at the casting-die interface. Using these values, the maximum die surface temperature and die surface temperature gradients are calculated. The values of maximum surface temperature obtained are 800°C and 315°C for a superheated (100°C) liquid charge and a partially solid (volume fraction solid ∼0.57) charge, respectively. The corresponding surface temperature gradients are 5640°C/cm and 718°C/cm, respectively. The reduced thermal shock experienced by the die when a partially solid metal alloy is cast should improve die life considerably over conventional practice. More... »

PAGES

471-477

References to SciGraph publications

  • 1976-08. The rheology of a partially solid alloy in JOURNAL OF MATERIALS SCIENCE
  • 1972-07. Rheological behavior of Sn-15 pct Pb in the crystallization range in METALLURGICAL AND MATERIALS TRANSACTIONS B
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    http://scigraph.springernature.com/pub.10.1007/bf02696935

    DOI

    http://dx.doi.org/10.1007/bf02696935

    DIMENSIONS

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