Alloy

Patent metadata

Field	Value
Publication number	US-11898228-B2
Application number	US-202117402699-A
Country	US
Kind code	B2
Filing date	Aug 16, 2021
Priority date	Aug 20, 2020
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

Abstract

A nickel-cobalt based superalloy composition consisting of by weight (wt.): 33.5 to 54 percent Ni; 19.5 to 36 percent Co; 9 to 12 percent Cr; 3.9 to 5.5 percent Al; 4.5 to 9.5 percent W; up to 5.5 percent Fe; 2 to 3.5 percent Mo; 0.6 to 5 percent Ta; 0.15 to 2.2 percent Ti; up to 1.75 percent Nb; up to 0.1 percent Hf; 0.005 to 0.03 percent C; 0.001 to 0.02 percent B; 0.005 to 0.06 percent Zr; up to 0.3 percent Si; up to 0.6 percent Mn; and the balance being impurities.

First claim

The invention claimed is:

1. A nickel-cobalt based superalloy composition consisting of, by weight:
33.5 to 54 percent nickel;
19.5 to 36 percent cobalt;
9.0 to 12.0 percent chromium;
3.9 to 5.5 percent aluminium;
5.39 to 9.5 percent tungsten;
up to 5.5 percent iron;
2 to 3.5 percent molybdenum;
0.6 to 5 percent tantalum;
0.15 to 2.2 percent titanium;
up to 1.75 percent niobium;
up to 0.1 percent hafnium;
0.005 to 0.03 percent carbon;
0.001 to 0.02 percent boron;
0.005 to 0.06 percent zirconium;
up to 0.3 percent silicon;
up to 0.6 percent manganese; and
the balance being impurities.

2. A nickel-cobalt based superalloy according to claim 1 , wherein the nickel and cobalt (Ni:Co) are present in the ratio between 1:1 and about 2.6:1 in atomic percent.

3. A nickel-cobalt based superalloy as claimed in claim 1 comprising by atomic percentage:
9-11.5 percent aluminium;
1.5 to 3 percent tungsten;
0.25-1.6 percent tantalum;
0.3-2.5 percent titanium; and
up to 1 percent niobium;
wherein a combined atomic percentage of aluminium, tantalum, titanium, niobium and 0.62 of tungsten in the nickel-cobalt based superalloy is between 12.5 and 16.25 percent to provide substantially 50 to 65 percent by volume gamma prime precipitates.

4. A nickel-cobalt based superalloy according to claim 1 comprising by atomic percentage:
1.5-3 percent tungsten;
1.3-2 percent molybdenum;
wherein a combined atomic percentage of Mo+0.38 of W in the nickel-cobalt based superalloy is at least 2.44 percent.

5. A nickel-cobalt based superalloy as claimed in claim 1 , wherein:
the density at ambient temperature is less than 8.5 grams per cubic centimetre; and
a combined atomic percentage of Mo+0.38 is no greater than 2.5 percent and a combined atomic percentage of W+Ta+Nb is no greater than 3.8 percent.

6. A nickel-cobalt based superalloy according to claim 1 , wherein the nickel-cobalt based superalloy has a gamma prime solvus temperature of 1020 to 1125° C.

7. A nickel-cobalt based superalloy as claimed in claim 1 , and comprising by weight:
47 to 54 percent nickel; and
19.5 to 25 percent cobalt.

8. A nickel-cobalt based superalloy as claimed in claim 1 , wherein the nickel-cobalt based superalloy consists of, by weight:
35.5% cobalt;
10.5% chromium;
5.4% tungsten;
2.9% molybdenum;
4.15% aluminium;
3% tantalum;
1.5% niobium;
1.5% titanium;
0.015% carbon;
0.009% boron;
0.039% zirconium; and
the balance being nickel and impurities.

9. A nickel-cobalt based superalloy as claimed in claim 1 , wherein the nickel-cobalt based superalloy consists of, by weight:
31.1% cobalt;
10.5% chromium;
5.4% tungsten;
2.9% molybdenum;
4.15% aluminium;
3% tantalum;
1.5% niobium;
1.5% titanium;
0.015% carbon;
0.009% boron;
0.039% zirconium; and
the balance being nickel and impurities.

10. A nickel-cobalt based superalloy as claimed in claim 1 , wherein the nickel-cobalt based superalloy consists of, by weight:
28.1% cobalt;
10.5% chromium;
5% iron;
5.4% tungsten;
2.9% molybdenum;
4.15% aluminium;
3% tantalum;
1.5% niobium;
1.5% titanium;
0.015% carbon;
0.009% boron;
0.039% zirconium; and
the balance being nickel and impurities.

11. A nickel-cobalt based superalloy as claimed in claim 1 , wherein the nickel-cobalt based superalloy consists of, by weight:
28.0% cobalt;
10.5% chromium;
5% iron;
5.4% tungsten;
2.9% molybdenum;
4.15% aluminium;
3% tantalum;
1.5% niobium;
1.5% titanium;
0.5% manganese;
0.1% silicon;
0.015% carbon;
0.009% boron;
0.039% zirconium; and
the balance being nickel and impurities.

12. A nickel-cobalt based superalloy as claimed in claim 1 , wherein the nickel-cobalt based superalloy consists of, by weight:
19.8% cobalt;
10.5% chromium;
6.2% tungsten;
2.8% molybdenum;
4.4% aluminium;
3.8% tantalum;
0.8% niobium;
0.8% titanium;
0.015% carbon;
0.009% boron;
0.030% zirconium; and
the balance being nickel and impurities.

13. A nickel-cobalt based superalloy as claimed in claim 1 , wherein the nickel-cobalt based superalloy consists of, by weight:
31.0% cobalt;
10.6% chromium;
5.5% tungsten;
2.9% molybdenum;
4.2% aluminium;
3.1% tantalum;
1.9% titanium;
0.015% carbon;
0.009% boron;
0.039% zirconium; and
the balance being nickel and impurities.

14. A nickel-cobalt based superalloy as claimed in claim 1 , wherein the nickel-cobalt based superalloy consists of, by weight:
34.5% cobalt;
10.3% chromium;
8.4% tungsten;
3.2% molybdenum;
4.5% aluminium;
3.75% tantalum;
1.0% titanium;
0.020% carbon;
0.008% boron;
0.030% zirconium; and
the balance being nickel and impurities.

15. A nickel-cobalt based superalloy as claimed in claim 1 , wherein the nickel-cobalt based superalloy consists of, by weight:
34.0% cobalt;
10.4% chromium;
8.4% tungsten;
3.2% molybdenum;
4.5% aluminium;
3.75% tantalum;
1.8% titanium;
0.020% carbon;
0.008% boron;
0.030% zirconium; and
the balance being nickel and impurities.

16. A nickel-cobalt based superalloy as claimed in claim 1 , wherein the nickel-cobalt based superalloy consists of, by weight:
34.5% cobalt;
10.3% chromium;
8.3% tungsten;
3.2% molybdenum;
4.45% aluminium;
3.7% tantalum;
0.8% niobium;
0.25% titanium;
0.020% carbon;
0.007% boron;
0.030% zirconium; and
the balance being nickel and impurities.

17. A nickel-cobalt based superalloy as claimed in claim 1 , wherein the nickel-cobalt based superalloy consists of, by weight:
34.2% cobalt;
10.3% chromium;
8.3% tungsten;
3.2% molybdenum;
4.4% aluminium;
3.7% tantalum;
1.5% niobium;
0.25% titanium;
0.020% carbon;
0.007% boron;
0.030% zirconium; and
the balance being nickel and impurities.

18. A nickel-cobalt based superalloy as claimed in claim 1 , wherein the nickel-cobalt based superalloy consists of, by weight:
20.3% cobalt;
10.7% chromium;
6.3% tungsten;
2.9% molybdenum;
4.5% aluminium;
0.8% tantalum;
0.4% niobium;
0.8% titanium;
0.25% silicon;
0.015% carbon;
0.009% boron;
0.030% zirconium; and
the balance being nickel and impurities.

19. A nickel-cobalt based superalloy as claimed in claim 1 , wherein the nickel-cobalt based superalloy consists of, by weight:
34.1% cobalt;
11.3% chromium;
8.4% tungsten;
3.2% molybdenum;
5.2% aluminium;
3.8% tantalum;
0.015% carbon;
0.015% boron;
0.060% zirconium; and
the balance being nickel and impurities.

20. A nickel-cobalt based superalloy composition consisting of, by weight:
33.5 to 54 percent nickel;
19.5 to 36 percent cobalt;
9.0 to 12.0 percent chromium;
3.9 to 5.5 percent aluminium;
4.5 to 9.5 percent tungsten;
up to 5.5 percent iron;
2 to 3.5 percent molybdenum;
0.6 to 3.4 percent tantalum;
0.15 to 2.2 percent titanium;
up to 1.75 percent niobium;
up to 0.1 percent hafnium;
0.005 to 0.03 percent carbon;
0.001 to 0.02 percent boron;
0.005 to 0.06 percent zirconium;
up to 0.3 percent silicon;
up to 0.6 percent manganese; and
the balance being impurities.

21. A nickel-cobalt based superalloy composition consisting of, by weight:
33.5 to 54 percent nickel;
19.5 to 36 percent cobalt;
9.0 to 12.0 percent chromium;
3.9 to 5.5 percent aluminium;
4.5 to 9.5 percent tungsten;
up to 5.5 percent iron;
2 to 3.5 percent molybdenum;
0.6 to 3.80 percent tantalum;
0.15 to 2.2 percent titanium;
up to 1.75 percent niobium;
up to 0.1 percent hafnium;
0

Assignees

• Rolls Royce Plc

Inventors

• Hardy Mark C
• Dye David
• Reynolds Lucy
• Mcauliffe Thomas
• Bantounas Ioannis

Classifications

• C22C30/00 Primary

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

• C22C19/056

  with the maximum Cr content being at least 10% but less than 20% · CPC title

• C22C19/057

  with the maximum Cr content being less 10% · CPC title

• C22C19/05 Primary

  with chromium · CPC title

• C22F1/10

  of nickel or cobalt or alloys based thereon · CPC title