Ni-based single crystal superalloy and turbine blade...

C - Chemistry – Metallurgy – 22 – C

Patent

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C22C 19/05 (2006.01) F01D 5/28 (2006.01) F01D 25/00 (2006.01) F02C 7/00 (2006.01) B22D 21/00 (2006.01) C22F 1/00 (2006.01) C22F 1/10 (2006.01)

Patent

CA 2680650

Disclosed is a Ni-based single crystal superalloy which has the following composition: Co: 0.0 to 15.0 mass% (inclusive), Cr: 4.1 to 8.0 mass% (inclusive), Mo: 2.1 to 6.5 mass% (inclusive), W: 0.0 to 3.9 mass% (inclusive), Ta: 4.0 to 10.0 mass% (inclusive), Al: 4.5 to 6.5 mass% (inclusive), Ti: 0.0 to 1.0 mass% (inclusive), Hf: 0.00 to 0.5 mass% (inclusive), Nb: 0.0 to 3.0 mass% (inclusive), Re: 3.0 to 8.0 mass% (inclusive) and Ru: 0.5 to 6.5 mass% (inclusive), with the remainder being Ni and unavoidable impurities, and which has a P1 (parameter-1) value of 700 or less wherein P1 represents a value of parameter-1 calculated by the following formula: P1 = 137 x [W(mass%)]+24 x [Cr(mass%)]+46 x [Mo(mass%)]-18 x [Re(mass%)]. The Ni-based single crystal superalloy has excellent relative creep strength.

Cette invention concerne un superalliage monocristallin à base de Ni ayant la composition suivante : Co : de 0,0 à 15,0 en % massique (inclus), Cr : de 4,1 à 8,0 en % massique (inclus), Mo : de 2,1 à 6,5 en % massique (inclus), W : de 0,0 à 3,9 en % massique (inclus), Ta : de 4,0 à 10,0 en % massique (inclus), Al : de 4,5 à 6,5 en % massique (inclus), Ti : de 0,0 à 1,0 en % massique (inclus), Hf : de 0,00 à 0,5 en % massique (inclus), Nb : de 0,0 à 3,0 en % massique (inclus), Re : de 3,0 à 8,0 en % massique (inclus) et Ru : de 0,5 à 6,5 en % massique (inclus), le reste étant du Ni et des impuretés inévitables. Le superalliage a une valeur P1 (paramètre-1) inférieure ou égale à 700, où P1 représente une valeur de paramètre-1 calculée selon la formule suivante: P1 = 137 x [W(en % massique)] + 24 x [Cr(en % massique)] + 46 x [Mo(en % massique)] - 18 x [Re(en % massique)]. Le superalliage monocristallin à base de NI présente une excellente résistance relative au fluage.

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