Title:
HOMOGENIZATION AND HEAT-TREATMENT OF CAST METALS
Document Type and Number:
WIPO Patent Application WO2007048250
Kind Code:
A8
Abstract:
A method of casting a metal ingot with a microstructure that facilitates further working, such as hot and cold rolling. The metal is cast in a direct chill casting mold, or the equivalent, that directs a spray of coolant liquid onto the outer surface of the ingot to achieve rapid cooling. The coolant is removed from the surface at a location where the emerging embryonic ingot is still not completely solid, such that the latent heat of solidification and the sensible heat of the molten core raises the temperature of the adjacent solid shell to a convergence temperature that is above a transition temperature for in-situ homogenization of the metal. A further conventional homogenization step is then not required. The invention also relates to the heat -treatment of such ingots prior to hot working.
Inventors:
WAGSTAFF ROBERT BRUCE (US)
FENTON WAYNE J (US)
FENTON WAYNE J (US)
Application Number:
PCT/CA2006/001767
Publication Date:
May 22, 2008
Filing Date:
October 27, 2006
Export Citation:
Assignee:
NOVELIS INC (CA)
WAGSTAFF ROBERT BRUCE (US)
FENTON WAYNE J (US)
WAGSTAFF ROBERT BRUCE (US)
FENTON WAYNE J (US)
International Classes:
B22D7/00; B22D7/12; B22D9/00; B22D15/04; B22D21/04; B22D30/00; B29C33/04; B29C39/38
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