Process for making high formability aluminium alloy sheets

Details Process for making high formability aluminium alloy sheets Process for making high formability aluminium alloy sheets

C - Chemistry, Metallurgy

22

F

C22F 1/05 (2006.01) C22F 1/057 (2006.01)

Patent

CA 2157000

Process for making high formability aluminium alloy sheets, wherein a sheet of an alloy in which Al is alloyed with Si, Mg, Cu, Mn and Fe and with one or more elements selected from Cr, Zn, Zr and Ti is subjected to a continuous solution treatment process for at least 3 seconds at over 450 ·C, followed by cooling to a temperature of 60 to 250 ·C at a rate higher than 100 ·C/mn, reeling while maintaining the sheet at the temperature of 60 to 250 ·C, and preageing for a period of 1 minute to 10 hours at said temperature of 60 to 250 ·C. The object of the invention is to improve the mechanical properties and the formability of aluminium alloy sheets to be used for automotive body components.

L'invention concerne un procédé de fabrication de tôles d'alliage d'aluminium à haute formabilité consistant en ce qu'une tôle d'un alliage dans lequel Al est allié à Si, Mg, Cu, Mn et Fe ainsi qu'à un ou plusieurs éléments choisis parmi Cr, Zn, Zr et Ti est soumis à un traitement de mise en solution en continu, d'au moins 3 secondes à plus de 450 ~C, suivi d'un refroidissement à une température de 60 à 250 ~C à une vitesse supérieure à 100 ~C/mn, d'un bobinage avec maintien à ladite température de 60 à 250 ~C et d'un prévieillissement d'une durée comprise entre 1 minute et 10 heures à ladite température de 60 à 250 ~C. L'invention a pour but d'améliorer les propriétés mécaniques et la formabilité des tôles d'alliage d'aluminium destinées notamment à la fabrication des éléments de carrosserie automobile.

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