Wang, Hong, Djambazov, Georgi ORCID: 0000-0001-8812-1269, Pericleous, Koulis A. ORCID: 0000-0002-7426-9999, Harding, Richard A. and Wickins, Michael (2010) Modelling the tilt-casting process for the tranquil filling of titanium alloy turbine blades. In: Modeling of Casting, Welding, and Advanced Solidification Processes - XII (MCWASP XII). John Wiley and Sons, Inc. / The Minerals, Metals & Materials Society (TMS), Warrendale, PA, USA, pp. 53-60. ISBN 978-0-87339-742-1

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Abstract

The tilt-casting method is used to achieve tranquil filling of gamma-TiAl turbine blades. The reactive alloy is melted in a cold crucible using an induction coil and then the complete crucible-mould- running system assembly is rotated through 180degrees to transfer the metal into the mould. The induction current is ramped down gradually as the rotation starts and the mould is preheated to maintain superheat. The liquid metal then enters the mould and the gas within it (argon) escapes through the inlet aperture and through auxiliary vents. Solidification starts as soon the metal enters the mould and it is important to account for this effect to predict and prevent misruns. The rotation rate has to be controlled carefully to allow sufficient time for gas evacuation, but at the same time preserve superheat. This 3-phase system is modelled using the FV method, with a fast implicit numerical scheme used to capture the transient liquid free surface. The enthalpy method is used to model solidification and predict defects such as trapped bubbles, macro-porosity or surface connected porosity. Modeling is used to support an experimental program for the development of a production method for gamma-TiAl blades, with a target length of 40cm. The experiments provide validation for the model and the model in turn optimizes the tilt-casting process. The work is part of the EU project IMPRESS.

Item Type:	Conference Proceedings
Title of Proceedings:	Modeling of Casting, Welding, and Advanced Solidification Processes - XII (MCWASP XII)
Additional Information:	[1] This paper forms part of a collection of papers from the 12th International Conference - MCWASP XII: Modeling of Casting, Welding and Advanced Solidification Processes XII - held 7-14 June 2009, in Vancouver, British Columbia, Canada. [2] Hardcover book and CD-ROM.
Uncontrolled Keywords:	titanium aluminide, investment casting, process simulation
Subjects:	T Technology > T Technology (General) T Technology > TS Manufactures Q Science > QA Mathematics
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:	Publisher Publisher Organisation
Last Modified:	02 Mar 2019 15:51
URI:	http://gala.gre.ac.uk/id/eprint/1300

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