Near-Gamma TiAl Investment Casting and its Optimization

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Two drawbacks are associated with the Induction Skull Melting process often used in the neargamma TiAl investment casting technology: (i) a relatively small achievable superheat which could cause misruns in thin-wall castings and (ii) a high investment cost necessary to built up the melting unit. Therefore, a more common melting route based on a refractory crucible has been reconsidered to overcome both disadvantages. The paper reports on results of trial casting experiments performed using this common melting route. A preliminary metallographic study indicated that, while the cast volume is free of the contamination, which would result from the reaction between the melt and the crucible, there still are internal microcracks generated during the cast solidification and cooling. Modelling and experimental effort was spent to optimise key parameters of the process (the amount of superheat, the mould temperature and the cooling kinetics) and to improve the quality of casts.

Investment casting, optimization

2004-02-01

The Minerals, Metals + Materials Society

San Diego, California, USA

0-87339-543-3

TMS 2003

111–

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