Nickel-chromium-cobalt base alloys and castings thereof

Details Nickel-chromium-cobalt base alloys and castings thereof Nickel-chromium-cobalt base alloys and castings thereof

C - Chemistry, Metallurgy

22

C

75/108

C22C 19/05 (2006.01)

Patent

CA 1202505

ABSTRACT OF THE DISCLOSURE Improved castable nickel-chromium-cobalt base alloys are disclosed. Castings made from these alloys are particularly useful as turbine blades or vane structures. Directionally-solidified castings can be made with the alloys of the invention. These alloys are characterized in that they contain from 20 to 23% chromium, from 17 to 23% cobalt, from 1 to 2.5% tungsten, from 0 to 0.5% molybdenum, from 0.4 to 1.2% niobium, from 0.6 to 1.4% tantalum, from 2.95 to 3,85% titanium, from 1.6 to 2.8% aluminium, from 0.3 to 1.3% hafnium, from 0.005 to 1% zirconium, from 0.001 to 1% boron, and from 0.01 to 0.25% carbon, the balance, apart from impurities, being nickel, wherein the contents of niobium, hafnium, titanium and aluminium are so correlated that they satisfy the expression (the Correlation Factor): 28327 Nb + 804 Hf + 36956 Ti + 115057 Al - 6676 Nb2 - 564 Hf2 - 4847 Ti2 - 54349 Al2 + 8392 Al3 - 5255 (Nb x Ti) ? 153123.

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