Ni-base directionally solidified superalloy and ni-base...

Details Ni-base directionally solidified superalloy and ni-base... Ni-base directionally solidified superalloy and ni-base...

C - Chemistry, Metallurgy

22

C

C22C 19/05 (2006.01) C30B 11/00 (2006.01)

Patent

CA 2479774

A Ni-base directionally solidified superalloy or a Ni-base single crystal superalloy, characterized in that it has a composition, in wt %: Al: 5.0 to 7.0 %, Ta+Nb+Ti: 4.0 to 16.0 %, Mo: 1.0 to 4.5 wt %, W: 4.0 to 8.0 wt %, Re: 3.0 to 8.0 wt %, Hf: 2.0 wt % or less, Cr: 10.0 % or less, Co: 15.0 % or less, Ru: 1.0 to 4.0 wt %, C: 0.2 wt % or less, B: 0.03 %, and balance: Ni and inevitable impurities. The Ni-base base directionally solidified superalloy or single crystal superalloy has an enhanced creep strength at high temperatures, and thus can be used for a turbine blade, a turbine vane and the like of a gas turbine for use in a jet engine or for industrial use.

Cette invention a trait à un superalliage à base de Ni, solidifié de manière directionnelle, ou à un superalliage à cristal unique à base de Ni dont la composition est la suivante : en pourcentage pondéral, Al, de 5,0 à 7,0, Ta + Nb + Ti, de 4,0 à 16,0, Mo, de 1,0 à 4,5. W, de 4,0 à 8,0, Re, de 3,0 à 8,0, Hf, 2,0 ou moins, Co, 15,0 ou moins, Ru, de 1,0à 4,0, C, 0,2 ou moins, B, 0,03, le reste se composant de Ni et des impuretés inévitables. Ce superalliage à base de Ni, solidifié de manière directionnelle, ou ce superalliage à cristal unique à base de Ni, fait montre d'une résistance renforcée au fluage à de hautes températures, ce qui permet de l'utiliser pour des aubes ou des pales ou analogue, d'une turbine à gaz de moteur à réaction ou bien dans l'industrie.

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