Harding, R.A., Wickins, M., Wang, H., Djambazov, G. ORCID: 0000-0001-8812-1269 and Pericleous, K. ORCID: 0000-0002-7426-9999 (2007) The tilt casting of titanium aluminides. In: LMPC 2007 Proceedings of the 2007 International Symposium on Liquid Metal Processing and Casting. LMPC, pp. 207-212.

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Abstract

TiAl castings are prone to various defects including bubbles entrained during the turbulent filling of moulds. The present research has exploited the principles of the Durville tilt casting technique to develop a novel process in which the Induction Skull Melting (ISM) of TiAl alloys in a vacuum chamber has been combined with controlled tilt pouring to achieve the tranquil transfer of the metal into a hot ceramic shell mould.
Practical casting equipment has been developed to evaluate the feasibility of this process in parallel with the development of novel software to simulate and optimize it. The PHYSICA CFD code was used to simulate the filling, heat transfer and solidification during tilt pouring using a number of free surface modelling techniques, including the novel Counter Diffusion Method (CDM). In view of the limited superheat, particular attention was paid to the mould design to minimize heat loss and gas entrainment caused by interaction between the counter-flowing metal and gas streams.
The model has been validated against real-time X-ray movies of the tilt casting of aluminium and against TiAl blade castings. Modelling has contributed to designing a mould to promote progressive filling of the casting and has led to the use of a parabolic tilting cycle to balance the competing requirements for rapid filling to minimize the loss of superheat and slow filling minimize the turbulence-induced defects.

Item Type:	Conference Proceedings
Title of Proceedings:	LMPC 2007 Proceedings of the 2007 International Symposium on Liquid Metal Processing and Casting
Additional Information:	[1] This paper was first presented at the International Symposium on Liquid Metal Processing and Casting (LMPC 2007) held from 2-5 September 2007 in Nancy, France. It was given within the Titanium Processing section.
Uncontrolled Keywords:	tiAl castings, turbulent filling, Durville tilt casting, induction skull melting (ISM), PHYSICA CDF Code, counter diffusion method (CDM), parabolic filling, turbulance induced defects
Subjects:	Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Pre-2014 Departments:	School of Computing & Mathematical Sciences School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis > Computational Science & Engineering Group School of Computing & Mathematical Sciences > Department of Computer Systems Technology School of Computing & Mathematical Sciences > Department of Mathematical Sciences
Related URLs:	Organisation
Last Modified:	02 Mar 2019 15:51
URI:	http://gala.gre.ac.uk/id/eprint/1105

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