Nickel-base superalloys

Details Nickel-base superalloys Nickel-base superalloys

C - Chemistry, Metallurgy

22

C

75/108

C22C 19/05 (2006.01)

Patent

CA 1098736

PC-5781/CAN Abstract Nickel-base superalloys suitable for the pro- duction of cast parts for use at elevated temperatures in corrosive atmospheres contain in weight per cent about 14% to 22% chromium, 5% to 25% cobalt, 1% to 5% tungsten, 0.5% to 3% tantalum, 2% to 5% titanium, 1% to 4.5% aluminum, up to 2% niobium, 0.35% to 1.2% boron, up to 3.5% molybdenum, up to 0.5% zirconium, up to 0.2 in total of yttrium or lanthanum or both, up to 0.1% carbon, the balance apart from impurities being nickel. Advantageously the alloys are controlled such that %Ti + %Al + %Nb + 0.5(%Ta) + 0.2(%Cr) = 11.2 to 12.2

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