Creep resistant titanium alloys

Patent metadata

Field	Value
Publication number	US-12234539-B2
Application number	US-202318483894-A
Country	US
Kind code	B2
Filing date	Oct 10, 2023
Priority date	Aug 28, 2018
Publication date	Feb 25, 2025
Grant date	Feb 25, 2025

Abstract

A non-limiting embodiment of a titanium alloy comprises, in weight percentages based on total alloy weight: 5.5 to 6.5 aluminum; 1.5 to 2.5 tin; 1.3 to 2.3 molybdenum; 0.1 to 10.0 zirconium; 0.01 to 0.30 silicon; 0.1 to 2.0 germanium; titanium; and impurities. A non-limiting embodiment of the titanium alloy comprises a zirconium-silicon-germanium intermetallic precipitate, and exhibits a steady-state creep rate less than 8×10 −4 (24 hrs) −1 at a temperature of at least 890° F. under a load of 52 ksi.

First claim

We claim:

1. A method of processing a titanium alloy, the method comprising:
solution treating a titanium alloy; and
aging the titanium alloy;
wherein the titanium alloy forms an intermetallic precipitate comprising zirconium, silicon, and germanium; and
wherein the titanium alloy consists of, in weight percentages based on total alloy weight:
5.5 to 6.5 aluminum;
1.5 to 2.5 tin;
1.3 to 2.3 molybdenum;
0.1 to 10.0 zirconium;
0.01 to 0.30 silicon;
0.1 to 2.0 germanium;
0 to 0.15 oxygen;
0 to 0.30 iron;
0 to 0.05 nitrogen;
0 to 0.05 carbon;
0 to 0.015 hydrogen;
0 to 0.1 of each of niobium, tungsten, hafnium, nickel, gallium, antimony, vanadium, tantalum, manganese, cobalt, and copper;
titanium; and
impurities.

2. The method of claim 1 , comprising:
solution treating the titanium alloy at 1780° F. to 1800° F.; and
aging the titanium alloy at 1025° F. to 1125° F.

3. The method of claim 1 , comprising:
solution treating the titanium alloy at 1780° F. to 1800° F. for 4 hours; and
aging the titanium alloy at 1025° F. to 1125° F. for 8 hours.

4. The method of claim 1 , comprising:
solution treating the titanium alloy at 1780° F. to 1800° F.;
cooling the titanium alloy to ambient temperature;
aging the titanium alloy at 1025° F. to 1125° F.; and
air cooling the titanium alloy.

5. The method of claim 1 , comprising:
solution treating the titanium alloy at 1780° F. to 1800° F. for 4 hours;
cooling the titanium alloy to ambient temperature at a rate depending on a cross-sectional thickness of the titanium alloy;
aging the titanium alloy at 1025° F. to 1125° F. for 8 hours; and
air cooling the titanium alloy.

6. The method of claim 1 , wherein the titanium alloy consists of, in weight percentages based on total alloy weight:
5.5 to 6.5 aluminum;
1.7 to 2.1 tin;
1.7 to 2.1 molybdenum;
3.4 to 4.4 zirconium;
0.03 to 0.11 silicon;
0.1 to 0.4 germanium;
0 to 0.15 oxygen;
0 to 0.30 iron;
0 to 0.05 nitrogen;
0 to 0.05 carbon;
0 to 0.015 hydrogen;
0 to 0.1 of each of niobium, tungsten, hafnium, nickel, gallium, antimony, vanadium, tantalum, manganese, cobalt, and copper;
titanium; and
impurities.

7. The method of claim 1 , wherein the titanium alloy consists of, in weight percentages based on total alloy weight:
5.9 to 6.0 aluminum;
1.9 to 2.0 tin;
1.8 to 1.9 molybdenum;
3.5 to 4.3 zirconium;
0.06 to 0.11 silicon;
0.1 to 0.4 germanium;
0 to 0.15 oxygen;
0 to 0.30 iron;
0 to 0.05 nitrogen;
0 to 0.05 carbon;
0 to 0.015 hydrogen;
0 to 0.1 of each of niobium, tungsten, hafnium, nickel, gallium, antimony, vanadium, tantalum, manganese, cobalt, and copper;
titanium; and
impurities.

8. The method of claim 1 , wherein the titanium alloy exhibits a steady-state creep rate less than 7.97×10 −4 (24 hrs) −1 at a temperature of at least 475° C. under a load of 52 ksi.

9. The method of claim 1 , wherein the titanium alloy exhibits an ultimate tensile strength of at least 130 ksi at 482° C.

10. A method of processing a titanium alloy, the method comprising:
solution treating a titanium alloy; and
aging the titanium alloy;
wherein the titanium alloy consists of, in weight percentages based on total alloy weight:
5.5 to 6.5 aluminum;
1.5 to 2.5 tin;
1.3 to 2.3 molybdenum;
0.1 to 10.0 zirconium;
0.01 to 0.30 silicon;
0.1 to 2.0 germanium;
0 to 0.15 oxygen;
0 to 0.30 iron;
0 to 0.05 nitrogen;
0 to 0.05 carbon;
0 to 0.015 hydrogen;
0 to 0.1 of each of niobium, tungsten, hafnium, nickel, gallium, antimony, vanadium, tantalum, manganese, cobalt, and copper;
titanium; and
impurities.

11. The method of claim 10 , comprising:
solution treating the titanium alloy at 1780° F. to 1800° F.; and
aging the titanium alloy at 1025° F. to 1125° F.

12. The method of claim 10 , comprising:
solution treating the titanium alloy at 1780° F. to 1800° F. for 4 hours; and
aging the titanium alloy at 1025° F. to 1125° F. for 8 hours.

13. The method of claim 10 , comprising:
solution treating the titanium alloy at 1780° F. to 1800° F.;
cooling the titanium alloy to ambient temperature;
aging the titanium alloy at 1025° F. to 1125° F.; and
air cooling the titanium alloy.

14. The method of claim 10 , comprising:
solution treating the titanium alloy at 1780° F. to 1800° F. for 4 hours;
cooling the titanium alloy to ambient temperature at a rate depending on a cross-sectional thickness of the titanium alloy;
aging the titanium alloy at 1025° F. to 1125° F. for 8 hours; and
air cooling the titanium alloy.

15. The method of claim 10 , wherein the titanium alloy exhibits a steady-state creep rate less than 7.97×10 −4 (24 hrs) −1 at a temperature of at least 475° C. under a load of 52 ksi.

16. The method of claim 10 , wherein the titanium alloy exhibits an ultimate tensile strength of at least 130 ksi at 482° C.

17. The method of claim 10 , wherein the titanium alloy consists of, in weight percentages based on total alloy weight:
5.5 to 6.5 aluminum;
1.7 to 2.1 tin;
1.7 to 2.1 molybdenum;
3.4 to 4.4 zirconium;
0.03 to 0.11 silicon;
0.1 to 0.4 germanium;
0 to 0.15 oxygen;
0 to 0.30 iron;
0 to 0.05 nitrogen;
0 to 0.05 carbon;
0 to 0.015 hydrogen;
0 to 0.1 of each of niobium, tungsten, hafnium, nickel, gallium, antimony, vanadium, tantalum, manganese, cobalt, and copper;
titanium; and
impurities.

18. The method of claim 10 , wherein the titanium alloy consists of, in weight percentages based on total alloy weight:
5.9 to 6.0 aluminum;
1.9 to 2.0 tin;
1.8 to 1.9 molybdenum;
3.5 to 4.3 zirconium;
0.06 to 0.11 silicon;
0.1 to 0.4 germanium;
0 to 0.15 oxygen;
0 to 0.30 iron;
0 to 0.05 nitrogen;
0 to 0.05 carbon;
0 to 0.015 hydrogen;
0 to 0.1 of each of niobium, tungsten, hafnium, nickel, gallium, antimony, vanadium, tantalum, manganese, cobalt, and copper;
titanium; and
impurities.

19. A method of processing a titanium alloy, the method comprising:
solution treating a titanium alloy; and
aging the titanium alloy;
wherein the titanium alloy forms an intermetallic precipitate comprising zirconium, silicon, and germanium; and
wherein the titanium alloy consists essentially of, in weight percentages based on total alloy weight:
5.5 to 6.5 aluminum;
1.5 to 2.5 tin;
1.3 to 2.3 molybdenum;
0.1 to 10.0 zirconium;
0.01 to 0.30 silicon;
0.1 to 2.0 germanium;
0 to 0.15 oxygen;
0 to 0.30 iron;
0 to 0.05 nitrogen;
0 to 0.05 carbon;
0 to 0.015 hydrogen;
0 to 0.1 of each of niobium, tungsten, hafnium, nickel, gallium, antimony, vanadium, tantalum, manganese, cobalt, and copper;
titanium; and
impurities.

20. The method of claim 19 , comprising:
solution treating the titanium alloy at 1780° F. to 1800° F.; and
aging the titanium alloy at 1025° F. to 1125° F.

21. The method of claim 19 , comprising:
solution treating the titanium alloy at 1780° F. to 1800° F. for 4 hours; and
aging the titanium alloy at 1025° F. to 1125° F. for 8 hours.

22. The method of claim 19 , comprising:
solution treating the titanium alloy at 1780° F. to 1800° F.;
cooling the titanium alloy to ambient temperature;
aging the titanium alloy at 1025° F. to 1125° F.; and
air cooling the titanium alloy.

23. The method of claim 19 , comprising:
solution treating the titanium alloy at 1780° F. to 1800° F. for 4 hours;
cooling the titanium alloy to ambient temperature at a rate depending on a cross-sectional t

Assignees

• Ati Properties Llc

Inventors

• Mantione John V
• Bryan David J
• Garcia-Avila Matias

Classifications

• C22C14/00 Primary

  Alloys based on titanium · CPC title

• C22F1/183 Primary

  of titanium or alloys based thereon · CPC title