Uphill method for the heat treatment and reduction of...

C - Chemistry – Metallurgy – 22 – F

Patent

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C22F 1/00 (2006.01) C21D 1/46 (2006.01) C21D 1/78 (2006.01) C22F 1/04 (2006.01)

Patent

CA 2529019

The invention relates to a method for the heat treatment of cast parts produced from a light metal melt, especially an aluminium melt, whereby internal stresses of cast parts formed in a complex manner can be especially effectively eliminated, and said method can be implemented in an economical manner and in such a way that it is efficient in terms of belt production. To this end, the respective cast part is quenched following an annealing process or from the casting heat, cooled to a low temperature, and then suddenly heated to a high temperature by being immersed in a salt melt at a temperature above the boiling temperature of water at a normal pressure.

L'invention concerne un procédé pour le traitement thermique de pièces coulées produites à partir d'un métal léger en fusion, notamment d'aluminium en fusion, grâce auquel on peut éliminer particulièrement efficacement les contraintes internes de pièces coulées à structure complexe et qui peut être mis en oeuvre de manière à la fois économique et efficace dans le cadre de la fabrication en série. Selon ce procédé, chaque pièce coulée est trempée après un traitement de recuit ou en sortie de coulée, puis est refroidie à une température basse après le trempage. Après le refroidissement à une température basse, la pièce est brusquement chauffée à une température élevée par plongée dans des sels fondus dont la température est supérieure à la température d'ébullition de l'eau à pression normale.

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