Gap formation and interfacial heat transfer in alloy 718 investment castings
- Auburn Univ., AL (United States). Space Power Inst.
Investment casting foundries increasingly rely on numerical simulations of their casting processes to enhance quality and reduce costs. An important aspect of numerical simulations is the interfacial heat transfer between the solidifying metal and the mold. The contact conductance varies during solidification as the mold expands and the metal shrinks, leading to the formation of a gap and significantly reduced contact conductance. Very little data are available for the estimation of contact conductance, especially for the superalloys used in the aerospace industry. This work reports on experimental and numerical results for the determination of contact conductance for an axi-symmetric casting of alloy 718. The heat transfer code TOPAZ2D in conjunction with Beck`s method was used for the numerical simulation of this inverse heat transfer problem. The effects of variation of mold properties and thermocouple locations on contact conductance are considered. A relationship between the varying interfacial heat transfer and the formation of gaps is also examined and compared to actual measured values determined by X-ray radiography.
- OSTI ID:
- 227766
- Report Number(s):
- CONF-9509118--; ISBN 0-87339-297-3
- Country of Publication:
- United States
- Language:
- English
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