| 摘要 |
PROBLEM TO BE SOLVED: To provide a nickel-based superalloy for unidirectional solidification, which has an approximately equivalent creep rupture strength at high temperature to that of a monocrystal material, and has hot oxidation resistance and hot corrosion resistance equivalent or superior to those of a conventional unidirectional solidification material. SOLUTION: The nickel-based superalloy for unidirectional solidification superior in strength, corrosion resistance and oxidation resistance comprises, by weight, 3.0-8.0% Cr, 3.0-18.0% Co, 4.5-10.0% W, 0.5-6.0% Re, 4.0-10.0% Ta, 0.8-4.0% Ti, 2.5-6.5% Al, 0.1-2.0% Hf, 0.01-0.15% C, 0.001-0.05% B, 0.001-0.05% Zr, 0% to 0.5% Mo, 0% to 6.0% Ru, while controlling the amounts of Si, P, S, O and N in the impurities to 0.1% or less Si, 0.01% or less P, 0.005% or less S, 0.005% or less O, and 0.005% or less N respectively, and the balance Ni with unavoidable impurities. COPYRIGHT: (C)2007,JPO&INPIT
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