Patent ID: 6974508
Filing Date: 2005-12-13
Classification: B22F,C22C,F01D,Y02T

Abstract:
1. A turbine disk including a nickel base superalloy having a composition consisting essentially of, in weight percent, 3.0–4.0 Al, 0.02–0.04 B, 0.02–0.05 C, 12.0–14.0 Cr, 19.0–22.0 Co, 2.0–3.5 Mo, greater than 1.0 to 2.1 Nb, 1.3 to 2.1 Ta, 3.0–4.0 Ti, 4.1 to 5.0 W, 0.03–0.06 Zr, balance essentially Ni and incidental impurities, wherein the turbine disk has a rim portion including coarse grain microstructures capable of withstanding 815° C. and a bore portion including fine grain microstructures capable of withstanding 704° C.