C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 1/02 (2006.01) C22C 1/03 (2006.01) C22F 1/04 (2006.01)
Patent
CA 2236144
The invention is a method of controlling the grain refinement of certain aluminium alloys. The grain sizes for different values of the grain growth index, GGI, are determined for the used casting method. The GGI is represented by the sum of m(k - 1) value multiplied with the concentration for every element in the aluminium alloy. If the value for a certain alloy is compared with known relations between the m(k - 1) value and the grain size the composition of the alloy melt is amended to an optimum grain size by adding a grain size affecting agent. The method can be further improved by optimising the amount of nucleating agent.
L'invention concerne un procédé de régularisation du recuit d'affinage structural de certains alliages d'aluminium. On détermine, pour le procédé de coulage utilisé, les dimensions du grain en fonction des différentes valeurs de l'indice de croissance du grain. Cet indice est représenté par la somme de la valeur m(k-1) multipliée par la concentration de chaque élément dans l'alliage d'aluminium. Si on compare la valeur d'un certain alliage avec des rapports connus entre la valeur m(k-1) et la dimension du grain, on amende la composition de l'alliage en fusion en lui ajoutant un agent modifiant la dimension du grain, afin d'obtenir une dimension optimale. On peut encore améliorer ce procédé en optimisant la quantité d'agent de nucléation.
Backerud Stig Lennart
Johnsson Mats
Sigworth Geoffrey K.
Opticast Ab
Smart & Biggar
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