Patent ID: 8764919

Claim:
A cobalt-base superalloy chemical composition consisting of: 25-28% by weight W; 3-8% by weight Al; 0.5-6% by weight Ta; 0-3% by weight Mo; 0.01-0.2% by weight C; 0.01-0.1% by weight Hf; 0.001-0.05% by weight B; 0.01-0.1% by weight Si; and remainder Co and unavoidable impurities; and wherein the superalloy has a microstructure including a γ-phase matrix and a γ′-phase dispersed in the matrix, wherein the γ-phase matrix comprises a face centered cubic γ-Co phase, and wherein the γ′-phase comprises Co 3 (Al,W) stabilized by Ta.