Patent ID: 6818077
Filing Date: 2004-11-16
Classification: C22C

Abstract:
A high-strength Ni-base superalloy comprising:12.0 to 16.0% by weight of Cr, 4.0 to 9.0% by weight of Co, 3.4 to 4.6% by weight of Al, 0.5 to 1.6% by weight of Nb, 0.05 to 0.16%b by weight of C, 0.005 to 0.025% by weight of B, 0 to 2.0% by weight of Hf, 0 to 0.5% by weight of Re, 0 to 0.05% by weight of Zr, 0 to 0.005% by weight of 0, 0 to 0.005% by weight of N, 0 to 0.01% by weight of Si, 0 to 0.2% by weight of Mn, 0 to 0.01% by weight of P, 0 to 0.01% by weight of S, and at least one of Ti, Ta and Mo, wherein Ti, Ta and Mo are in such amounts that are calculated by equations, wherein TiEq is within a range of from 4.0 to 6.0, and MoEq is within a range of from 5.0 to 8.0, and wherein &ggr;â€² phase is precipitated in the matrix of the alloy, TiEq=Ti % by weight+0.5153Ã—Nb % by weight+0.2647Ã—[Ta] % by weight, and MoEq=Mo % by weight+0.5217Ã—W+0.5303Ã—Ta % by weight+1.0326Ã—Nb % by weight.