| 摘要 |
A nickel-base alloy consisting of, in atomic percent unless otherwise stated, up to 8 percent Fe, up to 16 percent Co, between 15 and 25 percent Cr, up to 3 percent Mo, up to 2 percent W, between 3 and 5 percent Al, between 3 and 7.5 percent Nb, up to 3 percent Ta, up to 0.2 percent Ti, up to 0.5 percent C, up to 0.175 percent B, up to 0.07 percent Zr, up to 1 percent Mn, up to 1 percent Si, up to 0.2 percent Hf, the balance consisting of Ni and incidental impurities, wherein the atomic ratio of Al to Nb is between 0.4 and 1.7, the atomic ratio of the sum of Al and Ti to Nb is between 0.4 and 1.8, and, the composition comprising at least 10 percent of elements from the group consisting of Al, Nb, and Ti. The alloy has an improved combination of properties and higher temperature capability through improved weldability, resistance to surface environmental damage and high temperature proof strength compared with known alloys, and is intended to operate for prolonged periods of time up to peak temperatures of 750°C. Accordingly, the alloy is suitable, for the use in additive layer manufacture of components for gas turbine engines |
