Nickel base superalloy compositions being substantially free...

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

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

Patent

CA 2696939

A nickel base superalloy composition substantially free of rhenium includes, in percentages by weight: about 5-8 Cr; about 7-8 Co; about 1.3-2.2 Mo; about 4.75-6.75 W; about 6.0-7.0 Ta; if present, up to about 0.5 Ti; about 6.0-6.4 Al; about 0.15-0.6 Hf; if present, from about 0.03-0.06 C; if present, up to about 0.004 B; if present, one or more rare earths selected from Y, La, and Ce up to about 0.03 total, the balance in-cluding nickel and incidental impurities. The superalloy composition is able to provide sustained-peak low cy-cle fatigue and/or oxidation resistance properties com-parable to second generation superalloy compositions including at least about 3 wt% rhenium. Superalloy ar-ticles incorporating the compositions include nozzles, shrouds, and splash plates for gas turbine engines.

La présente invention concerne une composition de superalliage au nickel sensiblement exempte de rhénium, et des articles réalisés dans cette composition de superalliage comprenant les corps et proportions suivants (en poids) : Cr = env. 5% à 8%; Co = env. 7% à 8%; Mo = env. 1,3% à 2,2%; W = env. 4,75% à 6,75%; Ta = env. 6% à 7%; Ti éventuel = env. 0,5% maxi; Al = env. 6% à 6,4%; Hf éventuel = env. 0,15 à 0,6%; C éventuel = env. 0,03% à 0,06% mini; B éventuel = env. 0,004% maxi; une ou plusieurs terres rares choisies parmi Y, La et Ce pour env. 0,03% total maxi, le complément à 100% étant fourni par le nickel et les impuretés à l'état de traces. Cette composition de superalliage offre des propriétés de tenue aux essais SPLCF (Sustained-Peak Low-Cycle Fatigue) et/ou de résistance à l'oxydation comparables à celles des compositions de superalliages de deuxième génération comprenant au moins 3% en poids de rhénium. Les articles réalisés dans le superalliage de l'invention sont essentiellement des des buses, des carénages, et les plaques de pulvérisation pour des moteurs à turbine à gaz.

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