Nickel-base superalloy

• US 6,419,763 B1
• Filed: 05/18/2000
• Issued: 07/16/2002
• Est. Priority Date: 05/20/1999
• Status: Expired due to Fees

• Current Assignee: Alstom Limited (Alstom SA)
• Original Assignee: Alstom Limited (Alstom SA)
• Inventors: Fernihough, John, Konter, Maxim
• Primary Examiner(s): King, Roy
• Assistant Examiner(s): Wilkins, III, Harry D.
• Application Number:
  US09/572,301
• Time in Patent Office: 789 Days
• Field of Search: 148/404, 148/428, 420/448
• US Class Current: 148/404
• CPC Class Codes: C22C 19/056 with the maximum Cr content being at least 10% but less than 20%
• CPC Class Codes: C22C 19/057 with the maximum Cr content being less 10%

Abstract

A nickel-base superalloy, in particular for the production of single-crystal components or directionally solidified components, comprising (measured in % by weight): 3.0-13.0% Cr, 5.0-15.0% Co, 0-3.0% Mo, 3.5-9.5% W, 3.2-6.0% Al, 0-3.0% Ti, 2.0-10.0% Ta, 0-6.0% Re, 0.002-0.08% C, 0-0.04% B, 0-1.4% Hf, 0-0.005% Zr, 10-60 ppm N, remainder nickel plus impurities. As a result of the addition of nitrogen in defined quantities, TiN is formed during solidification and carbides with a block morphology are formed. It is thus possible to increase the carbon content without deterioration in the low cycle fatigue at high load temperature.

Claims

1. A nickel-base superalloy, comprising (measured in % by weight):

3.0-13.0% Cr;

5.0-15.0% Co;

0-3.0% Mo;

3.5-9.5% W;

3.2-6.0% Al;

0-3.0%-Ti;

2.0-10.0% Ta;

0-6.0% Re;

0.002-0.08% C;

0-0.04% B;

0-1.4% Hf;

0-0.005% Zr;

20-60 ppm N;

and a remainder including nickel plus impurities.

2. The nickel-base superalloy as claimed in claim 1, comprising (measured in % by weight):

6% Cr;

9% Co;

0.5% Mo;

8% W;

5.7% Al;

0.7% Ti;

3% Ta;

3% Re;

0.07% C;

0.015% B;

1.4% Hf;

0.005% Zr;

20-60 ppm N;

and a remainder including nickel plus impurities.

3. A directionally solidified component comprising the nickel-base superalloy of claim 2.

4. The nickel-base superalloy as claimed in claim 1, comprising (measured in % by weight):

3.0-13.0% Cr;

5.0-15.0% Co;

0-3.0% Mo;

3.5-9.5% W;

3.2-6.0% Al;

0-3.0% Ti;

2.0-10.0% Ta;

0-6.0% Re;

0.002-0.08% C;

0-0.04% B;

0-0.5%-Hf;

20-60 ppm N;

and a remainder including nickel plus impurities.

5. A directionally solidified component comprising the nickel-base superalloy of claim 4.

6. The nickel-base superalloy as claimed in claim 1, which has a nitrogen content of 20-50 ppm.

7. The nickel-base superalloy as claimed in claim 1, which has a nitrogen content of 20-40 ppm.

8. The nickel-base superalloy as claimed in claim 1, wherein N (in ppm)=(0.01-0.2) ppm C.

9. The nickel-base superalloy as claimed in claim 1, wherein N (in ppm)=(1.0-5.0) % by weight Cr.

10. The nickel-base superalloy as claimed in claim 1, wherein N (in ppm)=(1.0-4.0) % by weight C+3% by weight Ti+0.7% by weight Ta+0.11 (% by weight W+% by weight Re)+0.6 by weight Co−

0.682% by weight Al.

11. A directionally solidified component comprising the nickel-base superalloy of claim 1.

18. The nickel-base superalloy single-crystal component as claimed in claim 10, which has a nitrogen content of 20 to 50 ppm.

12. A nickel-base superalloy, comprising (measured in % by weight):

6.0-6.8% Cr;

8.0-10.0% Co;

0.5-0.7% Mo;

6.2-6.7% W;

5.4-5.8% Al;

0.6-1.2% Ti;

6.3-7.0% Ta;

2.7-3.2% Re;

0.02-0.04% C;

40-100 ppm B;

0.15-0.3% Hf;

15-50 ppm Mg;

0-400 ppm Y;

20-60 ppm N;

and a remainder including nickel plus impurities.

13. A directionally solidified component comprising the nickel-base superalloy of claim 12.

14. A nickel-base superalloy single-crystal component, consisting of (measured in % by weight):

6% Cr;

9% Co;

0.5% Mo;

8% W;

5.7% Al;

0.7% Ti;

3% Ta;

3% Re;

0.07% C;

0.015% B;

1.4% Hf;

0.005% Zr;

20-60 ppm N;

and a remainder including nickel plus impurities.

15. A nickel-base superalloy single-crystal component, consisting of (measured in % by weight):

3.0-13.0% Cr;

5.0-15.0% Co;

0-0.3% Mo;

3.5-9.5% W;

3.2-6.0% Al;

0-3.0% Ti;

2.0-10.0% Ta;

0-6.0% Re;

0.002-0.08% C;

0-0.04% B;

0-0.5% Hf;

20-60 ppm N;

and a remainder including nickel plus impurities.

16. A nickel-base superalloy single-crystal component, consisting of (measured in % by weight):

6.0-6.8% Cr;

8.0-10.0% Co;

0.5-0.7% Mo;

6.2-6.7% W;

5.4-8% Al;

0.6-1.2% Ti;

6.3-7.0% Ta;

2.7-3.2% Re;

0.02-0.04% C;

40-100 ppm B;

0.15-0.3% Hf;

15-50 ppm Mg;

0-400 ppm Y;

20-60 ppm N;

and a remainder including nickel plus impurities.

17. A nickel-base superalloy single-crystal component, consisting of (measured in % by weight):

3.0-13.0% Cr;

5.0-15.0% Co;

0-3.0% Mo;

3.5-9.5% W;

3.2-6.0% Al;

0-3.0% Ti;

2.0-10.0% Ta;

0-6.0% Re;

0.002-0.08% C;

0-0.04% B;

0-1.4% Hf;

0-0.005% Zr;

20-60 ppm N;

and a remainder including nickel plus impurities.

19. The nickel-base superalloy single-crystal component as claimed in claim 17, wherein N (in ppm)=(0.01-0.2) ppm C or N (in ppm)=(1.0-5.0) % by weight Cr or N (in ppm)=(1.0-4.0) % by weight C+3% by weight Ti+0.7% by weight Ta+0.11 (% by weight W+% by weight Re)+0.6% by weight Co−

0.682% by weight Al.

20. The nickel-base superalloy single-crystal component as claimed in one of claim 19, wherein the single-crystal component is a blade of a gas turbine.

21. The nickel-base superalloy single-crystal component as claimed in claim 17, which has a nitrogen content of 20 to 40 ppm.

22. A nickel-base superalloy single-crystal component, consisting of (measured in % by weight):

3.0-13.0% Cr;

5.0-15.0% Co;

0-3.0% Mo;

3.5-9.5% W;

3.2-6.0% Al;

0-3.0% Ti;

2.0-10.0% Ta;

0-6.0% Re;

0.002-0.08% C;

0-0.04% B;

0-1.4% Hf;

0-0.005% Zr;

an amount of N effective to suppress formation of large carbides having a script-like morphology;

and a remainder including nickel plus impurities.