Superalloy compositions, articles, and methods of manufacture

Patent metadata

Field	Value
Publication number	US-9783873-B2
Application number	US-201213372585-A
Country	US
Kind code	B2
Filing date	Feb 14, 2012
Priority date	Feb 14, 2012
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

A composition of matter comprises, in combination, in weight percent: a content of nickel as a largest content; 3.10-3.75 aluminum; 0.02-0.09 boron; 0.02-0.09 carbon; 9.5-11.25 chromium; 20.0-22.0 cobalt; 2.8-4.2 molybdenum; 1.6-2.4 niobium; 4.2-6.1 tantalum; 2.6-3.5 titanium; 1.8-2.5 tungsten; and 0.04-0.09 zirconium.

First claim

What is claimed is:

1. A composition of matter, comprising in combination, in weight percent:
a content of nickel as a largest content;
3.10-3.75 aluminum;
0.02-0.09 boron;
0.02-0.09 carbon;
9.5-11.25 chromium;
20.0-22.0 cobalt;
2.8-4.2 molybdenum;
1.6-2.4 niobium;
4.2-6.1 tantalum;
2.6-3.5 titanium;
1.8-2.5 tungsten; and
0.04-0.09 zirconium.

2. The composition of claim 1 comprising, in weight percent:
3.18-3.70 aluminum;
0.020-0.050 boron;
0.025-0.055 carbon;
10.00-10.85 chromium;
20.4-21.2 cobalt;
3.05-3.85 molybdenum;
1.70-2.29 niobium;
4.3-4.9 tantalum;
2.75-3.30 titanium;
1.9-2.4 tungsten; and
0.040-0.075 zirconium.

3. The composition of claim 1 consisting essentially of said combination.

4. The composition of claim 1 comprising, if any, in weight percent, no more than:
0.005 copper;
0.15 iron;
0.50 hafnium;
0.0005 sulfur;
0.1 silicon; and
0.1 vanadium.

5. The composition of claim 4 comprising, in weight percent, at least one of:
3.3-3.7 aluminum;
0.035-0.05 boron;
0.03-0.04 carbon;
10.0-10.4 chromium;
20.4-21.2 cobalt;
3.45-3.85 molybdenum;
1.89-2.29 niobium;
4.5-4.9 tantalum;
2.9-3.3 titanium;
2.0-2.4 tungsten; and
0.04-0.075 zirconium.

6. The composition of claim 1 comprising, in weight percent:
3.3-3.7 aluminum;
0.035-0.05 boron;
0.03-0.04 carbon;
10.0-10.4 chromium;
20.4-21.2 cobalt;
3.45-3.85 molybdenum;
1.89-2.29 niobium;
4.5-4.9 tantalum;
2.9-3.3 titanium;
2.0-2.4 tungsten;
0.04-0.075 zirconium; and
no more than 1.0 percent, individually, of every additional constituent, if any.

7. The composition of claim 1 comprising, in weight percent:
3.18-3.63 aluminum;
0.020-0.030 boron;
0.025-0.055 carbon;
10.05-10.85 chromium;
20.60-21.20 cobalt;
3.05-3.55 molybdenum;
1.70-2.00 niobium;
4.3-4.70 tantalum;
2.75-3.25 titanium;
1.90-2.10 tungsten;
0.050-0.070 zirconium; and
no more than 1.0 percent, individually, of every additional constituent, if any.

8. The composition of claim 1 wherein:
said content of nickel is at least 50 weight percent.

9. The composition of claim 1 wherein:
said content of nickel is 50-53 weight percent.

10. The composition of claim 1 wherein a weight ratio of said titanium to said aluminum is at least 0.57.

11. The composition of claim 1 wherein:
a combined content of said tantalum, aluminum, titanium, and niobium is at least 11.5 percent.

12. The composition of claim 1 wherein:
a combined content of said tantalum, aluminum, titanium, and niobium is 12.0-14.2 weight percent.

13. The composition of claim 1 wherein:
a combined content of said titanium and niobium is 4.6-5.25 weight percent.

14. The composition of claim 1 wherein:
a combined content of said tantalum and aluminum is 7.6-8.2 weight percent.

15. The composition of claim 1 wherein:
a weight ratio of said aluminum to said tantalum is 0.7-0.8.

16. The composition of claim 1 wherein:
a weight ratio of said molybdenum to said tungsten is 1.6-1.9.

17. The composition of claim 1 further comprising:
no more than 4.0 weight percent, individually, of every additional constituent, if any.

18. The composition of claim 1 further comprising:
no more than 0.5 weight percent, individually, of every additional constituent, if any.

19. The composition of claim 1 further comprising:
no more than 4.0 weight percent, total, of every additional constituent, if any.

20. The composition of claim 1 in powder form.

21. A process for forming an article comprising:
compacting a powder having the composition of claim 1 ;
forging a precursor formed from the compacted powder; and
machining the forged precursor.

22. The process of claim 21 further comprising:
heat treating the precursor, at least one of before and after the machining, by heating to a temperature of no more than 1232° C. (2250° F.).

23. The process of claim 21 further comprising:
heat treating the precursor, at least one of before and after the machining, the heat treating effective to increase a characteristic γ grain size from a first value of about 10 μm or less to a second value of 20-120 μm.

24. A gas turbine engine turbine or compressor disk having the composition of claim 1 .

25. A powder metallurgical article comprising:
a content of nickel as a largest content;
3.25-3.75 aluminum;
0.02-0.09 boron;
0.02-0.09 carbon;
9.0-11.0 chromium;
16.0-22.0 cobalt;
2.0-5.0 molybdenum;
1.0-3.5 niobium;
4.2-5.4 tantalum;
2.0-4.5 titanium;
1.8-2.4 tungsten; and
0.04-0.09 zirconium;

wherein:
a combined content of said tantalum, aluminum, titanium, and niobium is at least 11.5 weight percent;
a combined content of titanium and niobium is 4.6-5.9 weight percent; and
a combined content of tantalum and aluminum is 7.3-8.6 weight percent.

26. The powder metallurgical article of claim 25 being a gas turbine engine turbine or compressor disk.

Assignees

• Reynolds Paul L
• Stolz Darryl Slade
• United Technologies Corp

Inventors

• Reynolds Paul L
• Stolz Darryl Slade

Classifications

• C22C1/0433

  Nickel- or cobalt-based alloys · CPC title

• C22C1/04

  by powder metallurgy (C22C1/08 takes precedence) · CPC title

• B22F5/009

  of turbine components other than turbine blades (of turbine blades B22F5/04) · CPC title

• C22F1/10

  of nickel or cobalt or alloys based thereon · CPC title

• C22C30/00

  Alloys containing less than 50% by weight of each constituent · CPC title