| 摘要 |
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% (inclu sive), 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 t o 1.0 mass% (inclusive), Hf: 0.00 to 0.5 mass% (inclusive), Nb: 0.0 to 3.0 m ass% (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 whi ch 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%)]+2 4 x [Cr(mass%)]+46 x [Mo(mass%)]-18 x [Re(mass%)]. The Ni-based single cryst al superalloy has excellent relative creep strength.
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