| 摘要 |
PROBLEM TO BE SOLVED: To provide a nickel base single crystal superalloy having excellent creep rupture strength, corrosion resistance and oxidation resistance in a medium temperature region of 750 to 1,000°C, and suitable to a gas turbine for power generation, and to provide its production method. SOLUTION: The nickel base single crystal superalloy has a composition comprising, by weight, 3.0 to 8.0% Cr, 15.1 to 20.0% Co, 4.5 to 8.0% W, 3.3 to 6.0% Re, 4.0 to 8.5% Ta, 0.8 to 2.0% Ti, 4.5 to 6.5% Al, 0.01 to 0.2% Hf, 0 to <0.5% Mo, 0 to 6.0% Ru, 0 to 0.06% C, 0 to 0.01% B, 0 to 0.01% Zr, 0 to 0.005% O and 0 to 0.005% N, and the balance Ni with inevitable impurities, and in which the contents of Si, P and S in the impurities are controlled to≤0.1%,≤0.01% and≤0.005%, respectively. COPYRIGHT: (C)2008,JPO&INPIT
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