Nickel Based Alloy with High Fatigue Resistance and Methods of Forming the Same

Patent metadata

Field	Value
Publication number	US-2019241995-A1
Application number	US-201815890681-A
Country	US
Kind code	A1
Filing date	Feb 7, 2018
Priority date	Feb 7, 2018
Publication date	Aug 8, 2019
Grant date	—

Abstract

A nickel based alloy, along with methods of its use and manufacture, is provided that may include about 20 wt. % to about 26 wt. % cobalt; about 9 wt. % to about 13 wt. % chromium; about 2 wt. % to about 6 wt. % iron; about 3.5 wt. % to about 6 wt. % aluminum; about 9 wt. % to about 13 wt. % tungsten; about 6 wt. % to about 9 wt. % tantalum; about 0.06 wt. % to about 0.20 wt. % boron; and the balance nickel. The nickel based alloy may have gamma prime precipitates in a plurality of grain interiors and a gamma prime solvus temperature of about 1038° C. or greater. Additionally or alternatively, the nickel based alloy may comprise about 30% by volume or more gamma prime precipitates in the plurality of grain interiors.

First claim

What is claimed is:

1 . A nickel based alloy, comprising:
about 20 wt. % to about 26 wt. % cobalt; about 9 wt. % to about 13 wt. % chromium; about 2 wt. % to about 6 wt. % iron; about 3.5 wt. % to about 6 wt. % aluminum; about 9 wt. % to about 13 wt. % tungsten; about 6 wt. % to about 9 wt. % tantalum; about 0.06 wt. % to about 0.20 wt. % boron; and the balance nickel.

2 . The nickel based alloy according to claim 1 , wherein the nickel based alloy comprises gamma prime precipitates in a plurality of grain interiors and has a gamma prime solvus temperature of about 1038° C. or greater.

3 . The nickel based alloy according to claim 2 , wherein the nickel based alloy comprises about 30% by volume or more gamma prime precipitates in the plurality of grain interiors.

4 . The nickel based alloy according to claim 3 , wherein the nickel based alloy has a grain boundary phase fraction of about 20% by volume or more.

5 . The nickel based alloy according to claim 4 , wherein the nickel based alloy has a grain boundary phase lineal density of about 310 precipitates per mm or greater.

6 . The nickel based alloy according to claim 2 , wherein the nickel based alloy comprises precipitates of W-bearing phases along one or more grain boundaries.

7 . The nickel based alloy according to claim 6 , wherein the W-bearing phase comprises Laves phase, mu phase, beta phase, sigma phase, borides, or carbides.

8 . The nickel based alloy according to claim 1 , wherein the nickel based alloy comprises about 0.065 wt. % to about 0.155 wt. % boron.

9 . The nickel based alloy according to claim 1 , wherein the nickel based alloy comprises about 22% by weight to about 24% by weight cobalt, about 10% by weight to about 12% by weight chromium, about 3% by weight to about 5% by weight iron, about 4% by weight to about 5.5% by weight aluminum, about 10% by weight to about 12% by weight tungsten, about 7% by weight to about 8% by weight tantalum, and about 0.07% by weight to about 0.15% by weight boron.

10 . The nickel based alloy according to claim 1 , wherein the nickel based alloy further comprises greater than 0% by weight to about 0.1% by weight carbon.

11 . The nickel based alloy according to claim 1 , wherein the nickel based alloy further comprises about 0.02% by weight to about 0.08% by weight carbon.

12 . The nickel based alloy according to claim 1 , wherein the nickel based alloy further comprises greater than 0% by weight to about 0.5% by weight hafnium.

13 . The nickel based alloy according to claim 1 , wherein the nickel based alloy further comprises greater than 0% by weight to about 0.1% by weight zirconium.

14 . A component for a gas turbine assembly comprising the nickel alloy of claim 1 .

15 . A nickel based alloy consisting of:
about 20 wt. % to about 26 wt. % cobalt; about 9 wt. % to about 13 wt. % chromium; about 2 wt. % to about 6 wt. % iron; about 3.5 wt. % to about 6 wt. % aluminum; about 9 wt. % to about 13 wt. % tungsten; about 6 wt. % to about 9 wt. % tantalum; about 0.06 wt. % to about 0.20 wt. % boron; and the balance nickel.

16 . The nickel based alloy according to claim 15 , wherein boron is included in an amount of about 0.065 wt. % to about 0.155 wt. % boron.

17 . The nickel based alloy according to claim 15 , consisting of about 22% by weight to about 24% by weight cobalt, about 10% by weight to about 12% by weight chromium, about 3% by weight to about 5% by weight iron, about 4% by weight to about 5.5% by weight aluminum, about 10% by weight to about 12% by weight tungsten, about 7% by weight to about 8% by weight tantalum, and about 0.07% by weight to about 0.15% by weight boron.

Assignees

• Gen Electric

Inventors

• Suzuki Akane
• Buresh Steve John
• Didomizio Richard
• Nag Soumya
• Oppenheimer Scott Michael
• Pope Stephen Gerard

Classifications

• C22C19/056

  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

• C22C19/057

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

• C22C19/05

  with chromium · CPC title

• C22C19/051

  and Mo or W · CPC title