Edge-on stress-relief of thick aluminium plates

C - Chemistry – Metallurgy – 22 – F

Patent

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Details

C22F 1/04 (2006.01) C22F 1/043 (2006.01) C22F 1/05 (2006.01) C22F 1/053 (2006.01)

Patent

CA 2507820

In accordance with the present invention, there are provided methods for the manufacture of aluminum alloy plates having reduced levels of residual stress, comprising: providing a solution heat-treated and quenched aluminum alloy plate with a thickness of at least 5 inches, and stress relieving the plate by performing at least one compressing step at a total rate of 0.5 to 5 % permanent set along the longest or second longest edge of the plate. In the method, the dimension of the plate where the compression step is performed is along the longest or second longest edge of the plate, which is preferably no less than twice and no more than eight times the thickness of the plate. In further accordance with the present invention, there are provided stress- relieved alloys and plates that are provided with superior Wtot properties as well as reduced residual stress and heterogeneity values.

L'invention concerne des procédés de fabrication de plaques d'alliages d'aluminium présentant des niveaux réduits de contrainte résiduelle, qui consistent à produire une plaque d'alliage d'aluminium thermo-traitée et trempée par solution d'une épaisseur d'au moins 5 pouces, et à éliminer les contraintes sur la plaque en exécutant au moins une étape de compression à une vitesse totale de déformation permanente de 0,5 à 5 % sur le bord le plus long ou le second bord le plus long de la plaque. Dans ce procédé, la dimension de la plaque sur laquelle l'étape de compression est exécutée se situe sur le bord le plus long ou sur le second bord le plus long de la plaque, qui, de préférence est au moins égale à deux fois l'épaisseur de la plaque mais n'excède pas huit fois cette épaisseur. L'invention concerne en outre des alliages et des plaques anticontraintes qui présentent des propriétés W¿tot? supérieures ainsi que des valeurs de contrainte résiduelle réduite et d'hétérogénéité réduites.

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