High temperature, damage tolerant superalloy, an article of manufacture made from the alloy, and process for making the alloy
A nickel-base alloy is disclosed that has the following weight percent composition. C about 0.005 to about 0.06 Cr about 13 to about 17 Fe about 4 to about 20 Mo about 3 to about 9 W up to about 8 Co up to about 12 Al about 1 to about 3 Ti about 0.6 to about 3 Nb up to about 5.5 B about 0.001 to about 0.012 Mg about 0.0010 to about 0.0020 Zr about 0.01 to about 0.08 Si up to about 0.7 P up to about 0.05 and the balance is nickel, usual impurities, and minor amounts of other elements as residuals from alloying additions during melting. The alloy provides a combination of high strength, good creep resistance, and good resistance to crack growth. A method of heat treating a nickel base superalloy to improve the tensile ductility of the alloy is also disclosed. An article of manufacture made from the nickel base superalloy described herein is also disclosed.
1. A nickel-base superalloy that provides a combination of high strength, good creep resistance, and good resistance to crack growth, said alloy consisting essentially of, in weight percent:
C about 0.005 to about 0.1
Cr about 13 to about 17
Fe about 4 to about 20
Mo about 3 to about 9
W up to about 8
Co up to about 8
Al about 1 to about 3
Ti about 0.6 to about 3
Nb up to about 5.5
B about 0.001 to about 0.015
Mg about 0.0001 to about 0.0050
Zr about 0.001 to about 0.08
Si up to about 0.7
P up to about 0.05
and the balance is nickel, usual impurities, and minor amounts of other elements as residuals from alloying additions during melting.
2. The alloy as claimed in claim 1 which contains at least about 0.01% carbon.
3. The alloy as claimed in claim 1 which contains at least about 14% chromium.
4. The alloy as claimed in claim 1 which contains at least about 3.5% molybdenum.
5. The alloy as claimed in claim 1 which contains not more than about 17% iron.
6. The alloy as claimed in claim 1 which contains at least about 1% niobium.
7. The alloy as claimed in claim 1 which contains at least about 1% titanium.
8. A nickel-base superalloy that provides a combination of high strength, good creep resistance, and good resistance to crack growth, said alloy consisting essentially of, in weight percent:
C about 0.01 to about 0.05
Cr about 14 to about 16
Fe about 8 to about 17
Mo about 3.5 to about 8
W up to about 4
Co up to about 8
Al about 1.5 to about 2.5
Ti about 1 to about 2.5
Nb about 1 to about 5
B about 0.003 to about 0.010
Mg about 0.0001 to about 0.0020
Zr about 0.015 to about 0.06
Si up to about 0.7
P up to about 0.05
and the balance is nickel, usual impurities, and minor amounts of other elements as residuals from alloying additions during melting.
9. The alloy as claimed in claim 8 which contains at least about 0.02% carbon.
10. The alloy as claimed in claim 8 which contains at least about 14.5% chromium.
11. The alloy as claimed in claim 8 which contains at least about 3.8% molybdenum.
12. The alloy as claimed in claim 8 which contains not more than about 16% iron.
13. The alloy as claimed in claim 8 which contains up to about 5% cobalt.
14. The alloy as claimed in claim 8 which contains at least about 2% niobium.
15. The alloy as claimed in claim 8 which contains at least about 1.5% titanium.
16. A nickel-base superalloy that provides a combination of high strength, good creep resistance, and good resistance to crack growth, said alloy consisting essentially of, in weight percent:
C about 0.02 to about 0.04
Cr about 14.5 to about 15.5
Fe about 9 to about 16
Mo about 3.8 to about 4.5
W up to about 3
Co up to about 5
Al about 1.8 to about 2.2
Ti about 1.5 to about 2.1
Nb about 2 to about 4.5
B about 0.004 to about 0.008
Mg about 0.0001 to about 0.0016
Zr about 0.02 to about 0.04
Si up to about 0.7
P up to about 0.05
and the balance is nickel, usual impurities, and minor amounts of other elements as residuals from alloying additions during melting.
17. An article of manufacture having a combination of high strength, good creep resistance, and good resistance to crack growth, said article being made from a nickel-base superalloy that consists essentially of, in weight percent:
C about 0.005 to about 0.06
Cr about 13 to about 17
Fe about 4 to about 20
Mo about 3 to about 9
W up to about 8
Co up to about 8
Al about 1 to about 3
Ti about 0.6 to about 3
Nb up to about 5.5
B about 0.001 to about 0.012
Mg about 0.0001 to about 0.0020
Zr about 0.01 to about 0.08
Si up to about 0.7
P up to about 0.05
and the balance is nickel, usual impurities, and minor amounts of other elements as residuals from alloying additions during melting, wherein said alloy is characterized by a solvus temperature.
18. An article of manufacture having a combination of high strength, good creep resistance, and good resistance to crack growth, said article being made from a nickel-base superalloy that consists essentially of, in weight percent:
C about 0.01 to about 0.05
Cr about 14 to about 16
Fe about 8 to about 17
Mo about 3.5 to about 8
W up to about 4
Co up to about 8
Al about 1.5 to about 2.5
Ti about 1 to about 2.5
Nb about 1 to about 5
B about 0.003 to about 0.010
Mg about 0.0001 to about 0.0020
Zr about 0.015 to about 0.06
Si up to about 0.7
P up to about 0.05
and the balance is nickel, usual impurities, and minor amounts of other elements as residuals from alloying additions during melting, wherein the alloy has a γ′ solvus temperature not greater than about 1860° F.
19. An article of manufacture having a combination of high strength, good creep resistance, and good resistance to crack growth, said article being made from a nickel-base superalloy that consists essentially of, in weight percent:
C about 0.01 to about 0.05
Cr about 14 to about 16
Fe about 8 to about 17
Mo about 3.5 to about 8
W up to about 4
Co up to about 8
Al about 1.5 to about 2.5
Ti about 1 to about 2.5
Nb about 1 to about 5
B about 0.003 to about 0.010
Mg about 0.0001 to about 0.0020
Zr about 0.015 to about 0.06
Si up to about 0.7
P up to about 0.05
and the balance is nickel, usual impurities, and minor amounts of other elements as residuals from alloying additions during melting, wherein the alloy has a γ′ solvus temperature greater than about 1880° F. and when the article is annealed at a temperature below the solvus temperature, the alloy contains not more than about 1% tungsten.