Nickel alloy and articles

Patent metadata

Field	Value
Publication number	US-9562276-B2
Application number	US-201314105550-A
Country	US
Kind code	B2
Filing date	Dec 13, 2013
Priority date	Jul 27, 2010
Publication date	Feb 7, 2017
Grant date	Feb 7, 2017

Abstract

Articles suitable for use in high temperature applications, such as turbomachinery components, and methods for making such articles, are provided. One embodiment is an article. The article comprises a material comprising a plurality of L12-structured gamma-prime phase precipitates distributed within a matrix phase at a concentration of at least 20% by volume, wherein the gamma-prime phase precipitates are less than 1 micrometer in size, and a plurality of A3-structured eta phase precipitates distributed within the matrix phase at a concentration in the range from about 1% to about 25% by volume. The solvus temperature of the eta phase is higher than the solvus temperature of the gamma-prime phase. Moreover, the material has a median grain size less than 10 micrometers.

First claim

The invention claimed is:

1. An article comprising: a material comprising the following elements, in weight percent:
at least about 40% nickel,
from about 1.5% to about 8% titanium, and
from about 1.5% to about 4.5% aluminum,
wherein a weight ratio of titanium to aluminum is in the range from about 1 to about 4,
a plurality of L1 2 -structured ordered gamma-prime phase precipitates distributed within a matrix phase at a concentration of at least 20% by volume, wherein the gamma-prime phase precipitates are less than 1 micrometer in size, and
a plurality of A3-structured ordered eta phase precipitates distributed within the matrix phase at a concentration in the range from about 3% to about 25% by volume, wherein a solvus temperature of the eta phase is higher than a solvus temperature of the gamma-prime phase,
wherein the material further comprises from about 2% to about 8% tantalum, up to about 7% molybdenum, up to about 2% niobium, and up to about 1% hafnium and
wherein the material has a median grain size of less than 3 micrometers.

2. The article of claim 1 wherein the eta phase solvus temperature is greater than about 1100 degrees Celsius.

3. The article of claim 1 wherein the concentration of eta phase is in the range from about 3% to about 15% by volume.

4. The article of claim 1 wherein the concentration of eta phase is in the range from about 5% to about 10% by volume.

5. The article of claim 1 wherein the plurality of eta phase precipitates have a mean aspect ratio less than about 30.

6. The article of claim 1 wherein the plurality of eta phase precipitates has a median size less than about five times the grain size of the material.

7. The article of claim 1 wherein the plurality of eta phase precipitates has a median size less than about three times the grain size of the material.

8. The article of claim 1 wherein the material has a median grain size of less than 1 micrometer.

9. The article of claim 1 wherein the ratio of titanium to aluminum is in the range from about 1.25 to about 3.

10. The article of claim 1 wherein the ratio of titanium to aluminum is in the range from about 1.5 to about 2.5.

11. The article of claim 1 wherein the material further comprises:
from about 11.5% to about 15% chromium,
from about 15% to about 30% cobalt,
from about 0.02% to about 0.2% carbon,
from about 0.01% to about 0.05% boron,
from about 0.02% to about 0.1% zirconium.

12. The article of claim 1 wherein the material comprises:
at least about 40% nickel,
from about 1.5% to about 8% titanium, and
from about 1.5% to about 4.5% aluminum,
wherein a weight ratio of titanium to aluminum is in the range from about 1 to about 4,
from about 4% to about 6% tantalum,
from about 11.5% to about 13% chromium,
from about 16% to about 20% cobalt,
from about 0.03% to about 0.1% carbon,
from about 0.02% to about 0.08% zirconium
from about 1% to about 4% molybdenum,
from about 0.75% to about 1.25% niobium,
from about 2% to about 5% tungsten, and
from about 0.1% to about 0.6% hafnium.

13. The article of claim 12 wherein the material comprises from about 3% to about 6% titanium and from about 2% to about 3.5% aluminum.

14. An article comprising: a material comprising, in weight percent,
at least about 40% nickel,
from about 3% to about 6% titanium,
from about 4% to about 6% tantalum,
from about 2% to about 3.5% aluminum,
from about 11.5% to about 13% chromium,
from about 16% to about 20% cobalt,
from about 0.03% to about 0.1% carbon,
from about 0.02% to about 0.08% zirconium
from about 1% to about 4% molybdenum,
from about 0.75% to about 1.25% niobium,
from about 2% to about 5% tungsten, and
from about 0.1% to about 0.6% hafnium,
wherein a weight ratio of titanium to aluminum is in the range from about 1 to about 4;
wherein the material further comprises
a plurality of L1 2 -structured ordered gamma-prime phase precipitates distributed within a matrix phase at a concentration of at least 20% by volume, wherein the gamma-prime phase precipitates are less than 1 micrometer in size, and
a plurality of A3-structured ordered eta phase precipitates distributed within the matrix phase at a concentration in the range from about 3% to about 25% by volume, wherein a solvus temperature of the eta phase is higher than a solvus temperature of the gamma-prime phase,
wherein the material has a median grain size less than 3 micrometers, and wherein the plurality of eta phase precipitates has a median size less than about five times the grain size of the material.

15. An article comprising: a material comprising the following elements, in weight percent:
at least about 40% nickel,
from about 6% to about 8% titanium, and
from about 1.5% to about 4.5% aluminum,
wherein a weight ratio of titanium to aluminum is in the range from about 1 to about 4,
a plurality of L1 2 -structured ordered gamma-prime phase precipitates distributed within a matrix phase at a concentration of at least 20% by volume, wherein the gamma-prime phase precipitates are less than 1 micrometer in size, and
a plurality of A3-structured ordered eta phase precipitates distributed within the matrix phase at a concentration in the range from about 3% to about 25% by volume, wherein a solvus temperature of the eta phase is higher than a solvus temperature of the gamma-prime phase,
wherein the material has a median grain size less than 10 micrometers.

16. The article of claim 15 wherein the eta phase solvus temperature is greater than about 1100 degrees Celsius.

17. The article of claim 15 wherein the concentration of eta phase is in the range from about 5% to about 10% by volume.

18. The article of claim 15 wherein the material has a median grain size of less than 3 micrometers.

19. The article of claim 15 wherein the material has a median grain size of less than 1 micrometer.

Assignees

• Gen Electric

Inventors

• Didomizio Richard
• Marte Judson Sloan
• Subramanian Pazhayannur Ramanathan

Classifications

• C22F1/10

  of nickel or cobalt or alloys based thereon · CPC title

• C22C19/05

  with chromium · CPC title

• C22C19/07

  based on cobalt · CPC title

• C22C19/056 Primary

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

• C22C19/03

  based on nickel · CPC title