| 摘要 |
PROBLEM TO BE SOLVED: To provide an alloy material which is excellent in high temp. strength and whose cost is equal to that of alloy 713 and to provide an automotive turbine wheel casting using the alloy material. SOLUTION: As to an Ni base cast superalloy, in an Ni base superalloy which does not contain Ta and Hf, the solid solution index of theγphase and the lattice constant of theγphase are limited to improve the creep rupture characteristics of the alloy. As for the concrete components, it contains, by weight, 7.0 to 9.5% Cr, 2.5 to 6.0% Al, 1.0 to 5.5% Mo, 6.0 to 8.0% Nb, <=2.0% Ti, <6.0% Co, 0.02 to 0.2% C, <=0.03% B, <=0.1% Zr, <=1% Si, <=1% Mn, and the balance Ni with inevitable impurities.
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