Nickel alloy

Patent metadata

Field	Value
Publication number	US-10138534-B2
Application number	US-201514966564-A
Country	US
Kind code	B2
Filing date	Dec 11, 2015
Priority date	Jan 7, 2015
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

A nickel-base alloy having the following composition (in atomic percent unless otherwise stated): between 12 and 15% of elements from the group consisting of Al, Ti, Ta and Nb, between 12.5% and 17.5% Cr, between 22 and 29% Co, between 0 and 1.5% W, between 0 and 3% Mo, between 0.1 and 0.3% C, between 0.05 and 0.2% B, between 0.02 and 0.07% Zr and, optionally, up to 2% Fe, up to 1% Mn, up to 1% Si, and up to 0.05 Mg; the balance being Ni and incidental impurities. The alloy has an improved combination of properties (principally improved resistance to high temperature deformation and surface environmental damage) compared with known alloys, and is intended to operate for prolonged periods of time above 700° C., and up to peak temperatures of 800° C.

First claim

The invention claimed is:

1. A nickel alloy having the following composition (in atomic percent unless otherwise stated): between 5.75 and 6.75 Al, between 4.5 and 5.8 Ti, between 0.5 and 1.3 Ta, up to 1% Nb, between 13.5% and 16% Cr, between 22and 27% Co, between 0.1 and 0.3% C, between 0.05 and 0.2% B, between 0.02 and 0.07% Zr, up to 1.1% W, between 1.4 and 2.85% Mo, up to 1% Fe, up to 0.7% Mn, up to 1% Si, up to 0.15% Hf, and up to 0.05% Mg; the balance being Ni and incidental impurities.

2. A nickel-base alloy as claimed claim 1 and having the following composition: 26% Co, 15.5% Cr, 5.4% Ti, 6.4% Al, 0.6% Ta, 1.5% Mo, 0.5% W, 0.15% B, 0.15% C and 0.03% Zr; the balance being Ni and incidental impurities.

3. A nickel-base alloy as claimed in claim 1 and having the following composition: 23% Co, 15.1% Cr, 4.8% Ti, 6.25% Al, 1.20% Ta, 1.5% Mo, 0.5% W, 0.15% B, 0.135% C and 0.05% Zr; the balance being Ni and incidental impurities.

4. A nickel-base alloy as claimed in claim 1 and having the following composition: 23% Co, 15.1% Cr, 4.8% Ti, 6.25% Al, 1.20% Ta, 0% Nb, 2.25% Mo, 0.5% W, 0.15% B, 0.135% C and 0.05% Zr; the balance being Ni and incidental impurities.

5. A nickel-base alloy as claimed in claim 1 and having the following composition: 23% Co, 15.1% Cr, 4.8% Ti, 6.25% Al, 1.20% Ta, 1.8% Mo, 0.5% W, 0.15% B, 0.135% C and 0.05% Zr; the balance being Ni and incidental impurities.

6. A nickel-base alloy as claimed in claim 1 and having the following composition: 23% Co, 15.1% Cr, 4.8% Ti, 6.25% Al, 1.20% Ta, 2.75% Mo, 0.15% B, 0.135% C and 0.05% Zr; the balance being Ni and incidental impurities.

7. A nickel-base alloy as claimed in claim 1 and having the following composition: 26% Co, 15.1% Cr, 4.8% Ti, 6.25% Al, 1.20% Ta, 1.5% Mo, 0.5% W, 0.15% B, 0.135% C and 0.05% Zr; the balance being Ni and incidental impurities.

8. A nickel-base alloy as claimed in claim 1 and having the following composition: 23% Co, 15.1% Cr, 4.8% Ti, 6.25% Al, 1.20% Ta, 0.25% Nb, 1.5% Mo, 0.5% W, 0.15% B, 0.135% C and 0.05% Zr; the balance being Ni and incidental impurities.

9. A nickel-base alloy as claimed in claim 1 and having the following composition: 26% Co, 15% Cr, 5.5% Ti, 6.25% Al, 0.75% Ta, 0.25% Nb, 1.50% Mo, 1% W, 0.135% B, 0.145C and 0.035Zr; the balance being Ni and incidental impurities.

10. A nickel-base alloy as claimed in claim 1 and having the following composition: 26% Co, 15% Cr, 5.5% Ti, 6.25% Al, 0.75% Ta, 0.25% Nb, 2% Mo, 1% W, 0.135% B, 0.145% C and 0.035% Zr; the balance being Ni and incidental impurities.

11. A nickel-base alloy as claimed in claim 1 , in which the S content is less than 20 ppm.

12. A nickel-base alloy as claimed in claim 1 , in which the S content is less than 5 ppm.

13. A nickel-base alloy as claimed in claim 1 , in which the P content is less than 60 ppm.

14. A nickel-base alloy as claimed in claim 1 , in which the P content is less than 20 ppm.

15. A nickel base alloy according to claim 1 , wherein the total of Mo and W is less than 4 at %.

16. A nickel base alloy according to claim 1 , wherein the total of Mo and W is between 2 and 3 at %.

17. A nickel-base alloy according to claim 1 , wherein the Ti:Ta atomic ratio is at least than 2:1.

18. A nickel base alloy according to claim 1 , wherein the Cr content is between 15 and 16 at %.

Assignees

• Rolls Royce Plc

Inventors

• Hardy Mark C
• Stone Howard J
• Neumeier Steffen
• Jones Nicholas G
• Christofidou Katerina

Classifications

• C22C19/05

  with chromium · CPC title

• C22C19/056 Primary

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