NICKEL-BASE SUPERALLOY WITH EXCELLENT STRENGTH, CORROSION RESISTANCE AND OXIDATION RESISTANCE

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PROBLEM TO BE SOLVED : To provide a single crystal Ni-base superalloy capable of improving oxidation resistance and corrosion resistance at high temperatures without sacrificing high-temperature creep rupture strength. SOLUTION : The nickel-base superalloy has a composition consisting of, by weight, 3.0 to 7.0% Cr, 3.0 to 15.0% Co, 4.5 to 8.0% W, 3.3 to 6.0% Re, 4.0 to 8.0% Ta, 0.8 to 2.0% Ti, 4.5 to 6.5% Al, 0.1 to 6.0% Ru, 0.01 to 0.2% Hf, 0 to <0.5% Mo, 0 to 0.06% C, 0 to 0.01% B, 0 to 0.01% Zr, 0 to 0.005% O, 0 to 0.005% N and the balance Ni with inevitable impurities. This alloy can further contain a rare earth element in an amount ranging from 0.1 to 100 ppm. Corrosion resistance and oxidation resistance at high temperatures can be further improved by the incorporation of the rare earth element. COPYRIGHT : (C)2006, JPO&NCIPI