Homogenization and heat-treatment of cast metals

Details Homogenization and heat-treatment of cast metals Homogenization and heat-treatment of cast metals

B - Operations, Transporting

22

D

B22D 7/00 (2006.01) B22D 7/12 (2006.01) B22D 9/00 (2006.01) B22D 15/04 (2006.01) B22D 21/04 (2006.01) B22D 30/00 (2006.01) B29C 33/04 (2006.01) B29C 39/38 (2006.01)

Patent

CA 2625847

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.

L'invention concerne un procédé de coulage d'un lingot de métal ayant une microstructure qui facilite le travail subséquent, tel que le laminage à chaud et à froid. Le métal est coulé dans un moule de fonte à refroidissement intense et direct, ou l'équivalent, qui dirige un jet de liquide de refroidissement sur la surface externe du lingot pour effectuer un refroidissement rapide. Le liquide de refroidissement est enlevé de la surface à un endroit où le lingot embryonnaire émergent n'est pas encore complètement solide, de façon à ce que la chaleur latente de solidification et la chaleur sensible du cAEur fondu fassent monter la température de l'enveloppe solide adjacente à une température de convergence qui est supérieure à une température de transition pour l'homogénéisation in situ du métal. Une étape d'homogénéisation classique supplémentaire n'est alors pas requise. L'invention concerne également le traitement thermique de tels lingots avant le travail à chaud.

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