Nickel-base superalloy for single-crystal castings

摘要

A nickel-base superalloy contains, by wt., 9.5-10.0% Cr, 7.0-8.0% Co, 1.3-1.7% Mo, 5.75-6.25% W, 4.6-5.0% Ta, 3.4-3.6% Ti, 4.1-4.3% Al, 0.4-0.6% Nb, 0.1-0.2% Hf, 0.05-0.07% C, 0.003-0.005% B, balance Ni. The alloy may be conventionally cast, directionally solidified, and/or may be in the form of a single crystal in which any low-angle grain boundaries are greater than 0 deg., pref up to 20 deg.