Ni-based superalloy, and turbine rotor and stator blades for gas turbine using the same

摘要

An object of the present invention is to provide a Ni-based superalloy, especially for a conventional casting, having a good balance among high temperature strength, corrosion resistance and oxidation resistance, as compared to a conventional material. The Ni-based superalloy comprises Cr, Co, Al, Ti, Ta, W, Mo, Nb, C, B, and inevitable impurities, the balance being Ni, the Ni-based superalloy having a superalloy composition comprising, by mass, 13.1 to 16.0% Cr, 11.1 to 20.0% Co, 2.30 to 3.30% Al, 4.55 to 6.00% Ti, 2.50 to 3.50% Ta, 4.00 to 5.50% W, 0.10 to 1.20% Mo, 0.10 to 0.90% Nb, 0.05 to 0.20% C, and 0.005 to 0.02% B.

主权项

1. A Ni-based superalloy comprising Cr, Co, Al, Ti, Ta, W, Mo, Nb, Hf, C, B, Re, Zr, O, N, and inevitable impurities, the balance being Ni, the Ni-based superalloy having a superalloy composition comprising, by mass, 13.1 to 16.0% Cr, 13.1 to 18.0% Co, 2.30 to 3.30% Al, 4.55 to 6.00% Ti, 2.50 to 3.50% Ta, 4.00 to 4.90% W, 0.10 to 1.20% Mo, 0.10 to 0.90% Nb, 0.01 to 0.04% Hf, 0.05 to 0.20% C, 0.005 to 0.02% B, 0.003 to 0.50% Re, 0.01 to 0.05% Zr, 0.001 to 0.005% O and 0.001 to 0.005% N.