Low rhenium nickel base superalloy compositions and...

C - Chemistry – Metallurgy – 22 – C

Patent

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C22C 19/05 (2006.01) C30B 29/52 (2006.01)

Patent

CA 2696923

Low rhenium nickel base superalloy compositions and articles formed from the superalloy composition are provided. The nickel base superalloy composition includes in percentages by weight: about 5-8 Cr; about 6.5-9 Co; about 1.3-2.5 Mo; about 4.8-6.8 W; about 6.0-7.0 Ta; if present, up to about 0.5 Ti; about 6.0-6.4 Al; about 1-2.3 Re; if present, up to about 0.6 Hf; if present, up to about 0-1.5 C; if present, up to about 0.015 B; the balance being nickel and incidental impurities. Exemplary compositions are characterized by an Re ratio defined as the weight % of Re relative to the total of the weight % of W and the wt % of Mo, of less than about 0.3. Exemplary articles include air-foils for gas turbine engine blades or vanes, nozzles, shrouds, and splash plates.

La présente invention concerne des compositions de superalliage au nickel à faible teneur en rhénium, et des articles réalisés dans cette composition de superalliage. Cette composition de superalliage au nickel comprend les corps et proportions suivants (en poids) : Cr = env. 5% à 8%; Co = env. 6,5% à 9%; Mo = env. 1,3% à 2,5%; W = env. 4,6% à 6,8%; Ta = env. 6% à 7%; Ti éventuel = env. 0,5% maxi; Al = env. 6% à 6,4%; Re = 1% à 2,3%; Hf éventuel = env. 0,6% maxi; C éventuel = env. 1,5% maxi; B éventuel = env. 0,015% maxi; le complément à 100% étant fourni par le nickel et les impuretés à l'état de traces. Les compositions retenues pour l'invention sont caractérisées par un nombre de Re, correspondant au % en poids de Re rapporté à la somme du % en poids de W et du % en poids de Mo, inférieur à environ 0,3. Les articles réalisés dans le superalliage de l'invention sont essentiellement des profils pour pales ou aubes de moteur à turbine à gaz, des buses, des carénages, et les plaques de pulvérisation.

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