Nickel-based superalloy and articles
A nickel-based superalloy composition includes from about 5 to about 7 wt % aluminum, from about 4 to about 8 wt % tantalum, from about 3 to about 8 wt % chromium, from about 3 to about 7 wt % tungsten, from 1 to about 5 wt % molybdenum, from 1.5 to about 5 wt % rhenium, from 5 to about 14 wt % cobalt, from about 0 to about 1 wt % hafnium, from about 0.01 to about 0.03 wt % carbon, from about 0.002 to about 0.006 wt % boron, and balance nickel and incidental impurities. The composition may exhibit a sustained peak low cycle fatigue life at 1800° F./45 ksi of at least about 4000 cycles. The nickel-based superalloy composition may be used in single-crystal or directionally solidified superalloy articles, such as a blade, nozzle, a shroud, a splash plate, and a combustor of a gas turbine engine.
1. A composition of matter, comprising:
from about 5 to about 7 wt % aluminum;
from about 5.5 to about 8 wt % tantalum;
about 4.3 wt % chromium;
from about 3.5 to about 7 wt % tungsten;
from 1.5 to about 2.5 wt % molybdenum;
from 3 to about 4 wt % rhenium;
from 9 to about 12 wt % cobalt;
from about 0.2 to about 0.6 wt % hafnium;
from about 0.01 to about 0.03 wt % carbon;
from about 0.002 to about 0.006 wt % boron; and
balance nickel and incidental impurities,
wherein the composition exhibits a sustained peak low cycle fatigue life at 1800° F./45 ksi of at least 4000 cycles.
2. The composition of matter of claim 1 , wherein the composition of matter comprises from about 6 to about 8.0 wt % tantalum, from about 4.0 to about 6.0 wt % tungsten, from about 2.0 to about 2.5 wt % molybdenum, and from about 3.5 to 4.0 wt % rhenium.
3. The composition of matter of claim 1 , wherein the composition of matter comprises from about 6.5 to about 8 wt % tantalum and from about 5 to about 6 wt % tungsten.
4. The composition of matter of claim 1 , wherein the composition of matter does not comprise ruthenium.
5. The composition of matter of claim 1 , wherein the composition of matter comprises a combined total content of tantalum, molybdenum, and rhenium of less than 14.5 wt %.
6. An article comprising the composition of matter of claim 1 .
7. The composition of matter of claim 1 , wherein the composition exhibits a sustained peak low cycle fatigue life at 1800° F./45 ksi of at least 5000 cycles.
8. The composition of matter of claim 1 , wherein the composition exhibits a rupture life at 2000° F./20 ksi of at least 150 hours.
9. The composition of matter of claim 1 , wherein the composition exhibits a rupture life at 2000° F./20 ksi of at least 200 hours.
10. An article comprising a composition comprising:
from about 5 to about 7 wt % aluminum;
from about 5.5 to about 8 wt % tantalum;
about 4.3 wt % chromium;
from about 3.5 to about 7 wt % tungsten;
from 1.5 to about 2.5 wt % molybdenum;
from 3 to about 4 wt % rhenium;
from 9 to about 12 wt % cobalt;
from about 0.2 to about 0.6 wt % hafnium;
from about 0.01 to about 0.03 wt % carbon;
from about 0.002 to about 0.006 wt % boron; and
balance nickel and incidental impurities,
wherein the composition exhibits a sustained peak low cycle fatigue life at 1800° F./45 ksi of at least 4000 cycles.
11. The article of claim 10 , wherein the article comprises a component of a gas turbine engine selected from a nozzle, a shroud, a splash plate, and a combustor component.
12. The article of claim 10 , wherein the article comprises a directionally solidified component.
13. The article of claim 10 , wherein the article comprises a single-crystal component.
14. The article of claim 13 , wherein the single-crystal component comprises a blade of a gas turbine.
15. The article of claim 12 , wherein the directionally solidified component comprises a blade of a gas turbine.
16. A composition of matter, consisting of:
from about 5 to about 7 wt % aluminum;
from about 5.5 to about 8 wt % tantalum;
about 4.3 wt % chromium;
from about 3.5 to about 7 wt % tungsten;
from 1.5 to about 2.5 wt % molybdenum;
from 3 to about 4 wt % rhenium;
from 9 to about 12 wt % cobalt;
from about 0.2 to about 0.6 wt % hafnium;
from about 0.01 to about 0.03 wt % carbon;
from about 0.002 to about 0.006 wt % boron; and
balance nickel and incidental impurities,
wherein the composition exhibits a sustained peak low cycle fatigue life at 1800° F./45 ksi of at least 4000 cycles.
17. The composition of matter of claim 16 , wherein the composition of matter consists of:
from about 5 to about 7 wt % aluminum;
from about 6.0 to about 8 wt % tantalum;
about 4.3 wt % chromium;
from about 4.0 to about 7 wt % tungsten;
from 2.0 to about 2.5 wt % molybdenum;
from 3.5 to about 4 wt % rhenium;
from 9 to about 12 wt % cobalt;
from about 0.2 to about 0.6 wt % hafnium;
from about 0.01 to about 0.03 wt % carbon;
from about 0.002 to about 0.006 wt % boron; and
balance nickel and incidental impurities,
wherein the composition exhibits a sustained peak low cycle fatigue life at 1800° F./45 ksi of at least 4000 cycles.
18. The composition of matter of claim 16 , wherein the composition of matter consists of:
from about 5 to about 7 wt % aluminum;
from about 6.5 to about 8 wt % tantalum;
about 4.3 wt % chromium;
from about 5 to about 6 wt % tungsten;
from 1.5 to about 2.5 wt % molybdenum;
from 3 to about 4 wt % rhenium;
from 9 to about 12 wt % cobalt;
from about 0.2 to about 0.6 wt % hafnium;
from about 0.01 to about 0.03 wt % carbon;
from about 0.002 to about 0.006 wt % boron; and
balance nickel and incidental impurities,
wherein the composition exhibits a sustained peak low cycle fatigue life at 1800° F./45 ksi of at least 4000 cycles.
19. An article comprising the composition of matter of claim 16 .
20. The composition of matter of claim 16 , wherein the composition exhibits a sustained peak low cycle fatigue life at 1800° F./45 ksi of at least 5000 cycles.
21. The composition of matter of claim 16 , wherein the composition exhibits a rupture life at 2000° F./20 ksi of at least 150 hours.
22. The composition of matter of claim 16 , wherein the composition exhibits a rupture life at 2000° F./20 ksi of at least 200 hours.