Process for manufacturing hot-forged parts made of a...

C - Chemistry – Metallurgy – 22 – F

Patent

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C22F 1/06 (2006.01) C22C 23/06 (2006.01)

Patent

CA 2659041

The present invention relates to a process for manufacturing a part made of a magnesium alloy, comprising a step of forging a block of said alloy followed by a heat treatment, characterized in that the alloy is a foundry alloy based on 85% magnesium and containing, by weight: 0.2 to 1.3% zinc, 2 to 4.5% neodymium, 0.2 to 7.0% rare-earth metal with an atomic weight from 62 to 71 and 0.2 to 1.0% zirconium and in that the open-die/closed-die forging is carried out at a temperature above 400°C. In particular, the temperature is between 420 and 430°C and the forging step comprises plastic deformation carried out at a slow rate. The process allows parts to be obtained such as casing elements for aeronautical machines, operating at temperatures of around 200°C and having good ageing resistance.

La présente invention porte sur un procédé de fabrication d'une pièce en alliage de magnésium comprenant une étape de forgeage d'un bloc dudit alliage suivie d'un traitement thermique, caractérisé par le fait que l'alliage est un alliage de fonderie à base de 85 % magnésium comprenant en poids : 0,2 à 1,3 % de Zinc, 2 à 4,5 % de Néodyme, 0,2 à 7,0 % de terre rare métallique de poids atomique 62 à 71, 0,2 à 1,0 % de zirconium, et que le forgeage/matriçage est réalisé à une température supérieure à 400°C. En particulier la température est comprise entre 420 et 430° C et l'étape de forgeage comprend une déformation plastique effectuée à vitesse lente. Le procédé permet d'obtenir des pièces telles que des éléments de carter de machines aéronautiques, fonctionnant à une température de l'ordre de 200°C et ayant une bonne tenue au vieillissement.

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