Low density single crystal super alloy

Claim 2

A single crystal turbine engine blade or vane characterized by its resistance to creep and microstructural stability when operated under high temperature, high stress conditions and capability of being heat treated to effect total solutioning of the gamma prime while maintaining a thermal differential of approximately 20° F. (11° C.) between the final solutioning temperature and the incipient melting temperature, cast from an alloy consisting essentially of the nominal composition (wt/% or wt ppm): ______________________________________ Cr 9.8 C 33 ppm Co 5.0 V <10 ppm Mo 3.0 B <30 ppm Al 4.85 Zr <75 ppm Ti 4.75 Hf .11 Ta 2.0 Al + Ti 9.60 W <.02 Ni Balance ______________________________________ and having a density of 0.288 lbs/cu. in. (7.98 gms/cc).

Claim 3

A single crystal turbine engine blade characterized by its resistance to creep and microstructural stability when operated under high temperature, high stress conditions and capability of being heat treated to effect total solutioning of the gamma prime and substantial solutioning of the gamma/gamma prime eutectic, while maintaining a thermal differential of approximately 20° F. (11° C.) between the final solutioning temperature and the incipient melting temperature cast from an alloy consisting essentially of the nominal composition (wt/% or wt ppm); ______________________________________ Cr 9.8 C 33 ppm Co 5.0 V <10 ppm Mo 3.0 B <30 ppm Al 4.85 Zr <75 ppm Ti 4.75 Hf 0.11 Ta 2.0 Al + Ti 9.60 W <.02 Ni Balance ______________________________________ and having a density of 0.288 lbs/cu. in. (7.98 gms/cc).

Claim 4

A single crystal turbine engine blade characterized by its resistance to creep and microstructural stability when operated under high temperature, high stress conditions and capability of being heat treated to effect total solutioning of the gamma prime and substantial solutioning of the gamma/gamma prime eutectic, while maintaining a thermal differential of approximately 20° F. (11° C.) between the final solutioning temperature and the incipient melting temperature cast from an alloy consisting essentially of the nominal composition (wt/% or wt ppm); ______________________________________ Cr 9.8 C 33 ppm Co 5.0 V <10 ppm Mo 3.0 B <30 ppm Al 4.85 Zr <75 ppm Ti 4.75 Hf 0.11 Ta 2.0 Al + Ti 9.60 W <.02 Ni Balance ______________________________________ and having a density of 0.288 lbs/cu. in. (7.98 gms/cc).

Claim 5

A single crystal turbine engine blade characterized by its resistance to creep and microstructural stability when operated under high temperature, high stress conditions and having a liquidus of 2410° F. (1321° C.) and totally solutioned gamma prime and substantially solutioned gamma/gamma prime eutectic after solutioning for three hours at 2260° F. (1238° C.) plus three hours at 2320° F. (1271° C.) plus three hours at 2330° F. (1272° C.) with total absence of incipient melting, cast from an alloy consisting essentially of the nominal composition (wt/% or wt ppm): ______________________________________ Cr 9.8 C 33 ppm Co 5.0 V <10 ppm Mo 3.0 B <30 ppm Al 4.85 Zr <75 ppm Ti 4.75 Hf 0.11 Ta 2.0 Al + Ti 9.60 W <.02 Ni Balance ______________________________________ and having a density of 0.188 lbs/cu. in.

Claim 6

A single crystal turbine engine blade characterized by its resistance to creep and microstructural stability when operated under high temperature, high stress conditions and having a liquidus of 2410° F. (1321° C.) and totally solutioned gamma prime and substantially solutioned gamma/gamma prime eutectic after solutioning for three hours at 2260° F. (1238° C.) plus three hours at 2320° F. (1271° C.) plus three hours at 2330° F. (1272° C.) with total absence of incipient melting, cast from an alloy consisting essentially of the nominal composition (wt/% or wt ppm): ______________________________________ Cr 9.8 C 33 ppm Co 5.0 V <10 ppm Mo 3.0 B <30 ppm Al 4.85 Zr <75 ppm Ti 4.75 Hf 0.11 Ta 2.0 Al + Ti 9.60 W <.02 Ni Balance ______________________________________ and having a density of 0.188 lbs/cu. in.

Claim 7

A single crystal turbine engine blade or vane characterized by a density of 0.288 lb/cu. in., (7.98 gms/cc) its resistance to creep and microstructural stability under an operating condition equivalent to 51.0 ksi/1600° F. (351.6 MPa/870° C.) for 620.8 hrs. after solutioning sufficient to totally solution its gamma prime and substantially solution its gamma/gamma prime eutectic without any incipient melting, cast from an alloy consisting essentially of the composition: ______________________________________ Cr 9.5/10.3 Co 4.7/5.3 Mo 2.8/3.2 Al 4.7/4.9 Ti 4.6/4.8 Ta 1.8/2.2 W 0.10 max C 150 ppm max V 0.10 max B 50 ppm max Zr 100 ppm max Hf 0.0/0.12 Al + Ti 9.3/9.7 Ni Balance Si 0.05 max Mn 0.05 max Fe 0.25 max Cb 0.10 max Cu 0.01 max N 16 ppm max O 12 ppm max S 20 ppm max Mg 0.01 max Pb 2 ppm max Ag 2 ppm max Bi 0.3 ppm max Se 0.5 ppm max Te 0.3 ppm max Tl 0.3 ppm max Ga 25 ppm max Cd 2 ppm max Sn 25 ppm max Zn 5 ppm max Na 25 ppm max K 25 ppm max Sb 3 ppm max Au 2 ppm max In 2 ppm max Ge 2 ppm max As 5 ppm max Hg 3 ppm max Th 5 ppm max U 5 ppm max ______________________________________

Claim 8

A single crystal turbine engine blade or vane characterized by a density of 0.288 lb/cu. in., (7.98 gms/cc) its resistance to creep and microstructural stability under an operating condition equivalent to 51.0 ksi/1600° F. (351.6 MPa/870° C.) for 620.8 hrs. after solutioning sufficient to totally solution its gamma prime and substantially solution its gamma/gamma prime eutectic without any incipient melting, cast from an alloy consisting essentially of the composition: ______________________________________ Cr 9.5/10.3 Co 4.7/5.3 Mo 2.8/3.2 Al 4.7/4.9 Ti 4.6/4.8 Ta 1.8/2.2 W 0.10 max C 150 ppm max V 0.10 max B 50 ppm max Zr 100 ppm max Hf 0.0/0.12 Al + Ti 9.3/9.7 Ni Balance Si 0.05 max Mn 0.05 max Fe 0.25 max Cb 0.10 max Cu 0.01 max N 16 ppm max O 12 ppm max S 20 ppm max Mg 0.01 max Pb 2 ppm max Ag 2 ppm max Bi 0.3 ppm max Se 0.5 ppm max Te 0.3 ppm max Tl 0.3 ppm max Ga 25 ppm max Cd 2 ppm max Sn 25 ppm max Zn 5 ppm max Na 25 ppm max K 25 ppm max Sb 3 ppm max Au 2 ppm max In 2 ppm max Ge 2 ppm max As 5 ppm max Hg 3 ppm max Th 5 ppm max U 5 ppm max ______________________________________