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The use of combined DC and AC fields to increase superheat in an induction skull melting furnace

The use of combined DC and AC fields to increase superheat in an induction skull melting furnace

Harding, R.A., Wickins, M., Keough, G., Roberts, R.J., Pericleous, Kyriacos ORCID: 0000-0002-7426-9999 and Bojarevics, Valdis (2005) The use of combined DC and AC fields to increase superheat in an induction skull melting furnace. In: LMPC 2005 : proceedings of the 2005 international symposium on liquid metal processing and casting : Santa Fe, New Mexico, USA, September 18-21, 2005. ASM International, Materials Park, Ohio, USA, pp. 201-210. ISBN 0871708272; 978-087170827-4

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Abstract

Induction Skull Melting (ISM) is widely used for melting reactive materials such as titanium-based alloys prior to casting. Although the water-cooled copper crucible avoids contamination, it produces a low superheat which is compensated for by pouring the metal at high speed into the mould. However, this often results in entrainment defects, such as bubbles. The University of Greenwich (UK) has developed a computer model of the ISM process which simulates the coupled influences of turbulent flow, heat transfer with phase change, and magneto-hydrodynamics. The model has predicted that the superimposition of a strong DC field on top of the normal AC field would reduce the turbulent stirring in the liquid metal, thereby reducing the heat loss through the base of the crucible and increasing the superheat. Consarc Corporation (USA) has developed the technology to apply a DC field to an ISM furnace at the University of Birmingham (UK). Research to measure the resulting increase of superheat has confirmed the computer predictions and showed that the addition of a DC field increased the superheat in molten TiAl from ∼45°C (AC field only) to ∼81°C (DC + AC fields). A similar increase in superheat was also measured when melting commercial purity titanium.

Item Type: Conference Proceedings
Title of Proceedings: LMPC 2005 : proceedings of the 2005 international symposium on liquid metal processing and casting : Santa Fe, New Mexico, USA, September 18-21, 2005
Additional Information: [1] Conference of LMPC 2005 - 2005 International Symposium on Liquid Metal Processing and Casting; Conference Date: 18 to 21 September 2005; Conference Code: 67078)
Uncontrolled Keywords: contamination, defects, electric fields, heat transfer, superheaters, titanium alloys, turbulent flow, induction skull melting, modeling, phase change, superheat, melting furnaces,
Subjects: T Technology > TN Mining engineering. Metallurgy
T Technology > TP Chemical technology
T Technology > TS Manufactures
Pre-2014 Departments: School of Computing & Mathematical Sciences
School of Computing & Mathematical Sciences > Department of Mathematical Sciences
Related URLs:
Last Modified: 14 Oct 2016 09:18
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/7263

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