Improved VDC casting of aluminium alloys through an understanding of the surface properties of the molten metal

Taylor, J. A. and Bainbridge, I. F. (2006). Improved VDC casting of aluminium alloys through an understanding of the surface properties of the molten metal. In: W.J. Poole, M.A. Wells and D.J. Lloyd, Materials Science Forum - Aluminium alloys 2006 : research through innovation and technology : proceedings of the 10th International Conference on Aluminium Alloys. 10th International Conference on Aluminium Alloys, Vancouver, B.C., (1693-1698). 9 - 13 July 2006.


Author Taylor, J. A.
Bainbridge, I. F.
Title of paper Improved VDC casting of aluminium alloys through an understanding of the surface properties of the molten metal
Conference name 10th International Conference on Aluminium Alloys
Conference location Vancouver, B.C.
Conference dates 9 - 13 July 2006
Proceedings title Materials Science Forum - Aluminium alloys 2006 : research through innovation and technology : proceedings of the 10th International Conference on Aluminium Alloys   Check publisher's open access policy
Journal name Aluminium Alloys 2006, Pts 1 and 2   Check publisher's open access policy
Place of Publication Zurich-Uetikon, Switzerland
Publisher Trans Tech Publications
Publication Year 2006
Sub-type Fully published paper
Open Access Status
ISBN 0-87849-408-1
ISSN 0255-5476
Editor W.J. Poole
M.A. Wells
D.J. Lloyd
Volume 519-521
Issue PART 2
Start page 1693
End page 1698
Total pages 6
Language eng
Abstract/Summary Vertical direct chill (VDC) casting of aluminium alloys is a mature process that has evolved over many decades through gradual change to both equipment design and casting practice. Today, air-pressurised, continuous lubrication, hot top mould systems with advanced station automation are selected as the process of choice for producing extrusion billet. Specific sets of operating parameters are employed on these stations for each alloy and size combination to produce optimal billet quality. The designs and parameters are largely derived from past experience and accumulated know-how. Recent experimental work at the University of Queensland has concentrated on understanding the way in which the surface properties of liquid aluminium alloys, e.g., surface tension, wetting angle and oxide skin strength, influence the size and shape of the naturally-stab le meniscus for a given alloy, temperature and atmosphere. The wide range of alloy-and condition-dependent values measured has led to the consideration of how these properties impact the stability of the enforced molten metal meniscus within the hot top mould cavity. The actual shape and position of the enforced meniscus is controlled by parameters such as the upstream conduction distance (UCD) from sub-mould cooling and the molten metal head. The degree of deviation of this actual meniscus from the predicted stable meniscus is considered to be a key driver in surface defect formation. This paper reports on liquid alloy property results and proposes how this knowledge might be used to better design VDC mould systems and casting practices.
Subjects C1
291302 Physical Metallurgy
671004 Castings
Keyword Materials Science, Multidisciplinary
Vdc Mould
Billet Casting
Aluminium Alloys
Surface Tension
Meniscus
Oxide Skin
Tension
Q-Index Code C1

 
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Created: Mon, 13 Aug 2007, 16:29:32 EST