Super oxidation and cyclic damage resistant nickel-base...

C - Chemistry – Metallurgy – 22 – C

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C22C 19/05 (2006.01)

Patent

CA 2755018

A nickel-base superalloy composition including (measured in % by weight) from about 6.8 to about 7.5% alu-minum, from about 4 to about 8% tantalum, from about 4 to about 10% chromium, from about 2 to about 7% tungsten, from 0 to about 6% rhenium, from 0 to about 5% cobalt, from 0 to about 0.2% silicon, optionally, from about 0.15 to about 0.7% hafnium, from 0 to about 0.5% titanium, from 0 to about 4% molybdenum, from 0 to about 0.005% boron, from 0 to about 0.06% carbon, from 0 to about 0.03% of a rare earth addition selected from the group consisting of yttrium, lanthanum, cesium, and combina-tions thereof, balance nickel and incidental impurities. The nickel-base superalloy composition may be used in single-crystal or di-rectionally solidified superalloy articles such as high pressure turbine blades for a gas turbine engine.

L'invention porte sur une composition de superalliage à base de nickel comprenant (mesurés en % en poids) d'environ 6,8 à environ 7,5 % d'aluminium, d'environ 4 à environ à environ 8 % de tantale, d'environ 4 à environ 10 % de chrome, d'environ 2 à environ 7 % de tungstène, de 0 à environ 6 % de rhénium, de 0 à environ 5 % de cobalt, de 0 à environ 0,2 % de silicium, éventuellement d'environ 0,15 à environ 0,7 % d'hafnium, de 0 à environ 0,5 % de titane, de 0 à environ 4 % de molybdène, de 0 à environ 0,005 % de bore, de 0 à environ 0,06 % de carbone, de 0 à environ 0,3 % d'un ajout de terre rare choisi dans le groupe constitué par l'yttrium, le lanthane, le césium et des associations de ceux-ci, le reste étant du nickel et des impuretés fortuites. La composition de superalliage à base de nickel peut être utilisée dans des articles en superalliage monocristallin ou solidifié de façon directionnelle tels que des lames de turbine à haute pression pour une turbine à gaz.

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