Method of treating superalloy articles

Patent metadata

Field	Value
Publication number	US-10556294-B2
Application number	US-201715615001-A
Country	US
Kind code	B2
Filing date	Jun 6, 2017
Priority date	Jun 6, 2017
Publication date	Feb 11, 2020
Grant date	Feb 11, 2020

Abstract

A method of treating a superalloy article, including selecting an article having a superalloy composition, whereby the article has a treatable feature on its surface. The method further includes removing a base alloy from a region abutting a first portion of the treatable feature. The method further includes treating a second portion of the treatable feature with a treatment composition to remove surface oxides. The method further includes inserting a treatment material into the first portion of the treatable feature followed by depositing the base alloy in the first portion of the treatable feature. The method further includes heat treating the article at a temperature above the melting point of the treatment material whereby the treatment material flows into the second portion of the treatable feature forming a treated article.

First claim

What is claimed is:

1. A method of treating a superalloy article, comprising:
selecting an article having a superalloy composition, whereby said article has at least one treatable feature on its outermost surface;
removing a base alloy from a region abutting a portion of the at least one treatable feature to form a first treatment region and a second treatment region, wherein the base alloy has not been removed from the region abutting the second treatment region;
treating at least a portion of the second treatment region with a treatment composition including a silicon aluminum alloy or an aluminum fluoride derivative to form a clean second treatment region;
inserting a treatment material into the first treatment region;
depositing the base alloy into the first treatment region;
heating the article to a temperature above the melting point of the treatment material thereby allowing the molten treatment material to flow into the clean second treatment region to form a treated article.

2. The method of claim 1 , further comprising processing the treated article to form a contoured surface.

3. The method of claim 2 , wherein the contoured surface corresponds to the article surface prior to the formation of the at least one treatable feature.

4. The method of claim 1 , wherein the treatable feature includes a crack or defect.

5. The method of claim 1 , wherein the treatable feature includes an opening to the atmosphere.

6. The method of claim 1 , wherein the first treatment region extends into the treatable feature about 75 percent to about 95 percent of the depth of the treatable feature.

7. The method of claim 6 , wherein the first treatment region includes a rounded or substantially flat zone.

8. The method of claim 1 , wherein the aluminum fluoride derivative includes a potassium aluminum fluoride (KAlF 4 ).

9. The method of claim 1 , wherein inserting the treatment composition removes substantially all the metal oxides from the contacted area.

10. The method of claim 1 , wherein the temperature is below the melting point of the base alloy.

11. The method of claim 1 , wherein depositing the base alloy includes depositing the base alloy by cold spray deposition.

12. The method of claim 1 , wherein the molten treatment material flowing into the second treatment region is at least partially facilitated by hydraulic force or capillary action.

13. A superalloy article, treated by the method of claim 1 .

14. A method of treating a superalloy article, comprising:
selecting an article having a superalloy composition, whereby said article has at least one treatable feature on its outermost surface;
removing a base alloy from a region abutting a portion of the at least one treatable feature to form a first treatment region, and wherein the base alloy has not been removed from a region abutting at least a portion of the treatable feature designated as a second treatment region;
removing a base alloy from a region abutting a portion of the second treatment region to form a modified second treatment region;
inserting a treatment material into the first treatment region;
depositing the base alloy into the first treatment region;
heating the article to a temperature above the melting point of the treatment material thereby allowing the molten treatment material to flow into the modified second treatment region to form a treated article;
wherein the molten treatment material flowing into the second treatment region is at least partially facilitated by hydraulic force or capillary action.

15. The method of claim 13 , further comprising processing the treated article to form a contoured surface.

16. The method of claim 14 , wherein the contoured surface corresponds to the article surface prior to the formation of the at least one treatable feature.

17. The method of claim 14 , wherein the treatable feature includes a crack or defect.

18. The method of claim 14 , wherein the temperature is below the melting point of the base alloy.

19. The method of claim 14 , wherein depositing the base alloy includes depositing the base alloy by cold spray deposition.

20. A method for treating a component, comprising:
selecting an article having a superalloy composition, whereby said article has at least one treatable feature on its outermost surface;
removing a base alloy from a region abutting a portion of the at least one treatable feature to form a first treatment region and a second treatment region, wherein the base alloy has not been removed from the region abutting the second treatment region;
inserting a polymeric treatment composition including polytetrafluoroethylene into the first treatment region;
inserting a treatment material into the first treatment region;
depositing the base alloy into the first treatment region;
heating the component to a temperature above the decomposition temperature of the polytetrafluoroethylene to form a clean second treatment region; and
heating the component to a temperature above the melting point of the treatment material thereby allowing the molten treatment material to flow into the clean second treatment region to form a treated article.

21. The method of claim 20 , further comprising processing the base alloy to form a surface contoured to the component.

22. The method of claim 21 , wherein the processing is a technique selected from the group consisting of blending, grinding, machining, scraping, and combinations thereof.

23. The method of claim 20 , wherein the component includes a superalloy.

24. The method of claim 20 , wherein the component includes a turbine component.

25. The method of claim 20 , wherein the pre-sintered preform includes at least one braze alloy.

26. The method of claim 20 , wherein the depositing includes cold spray deposition.

27. The method of claim 20 , wherein the temperatures are below the melting point of the base alloy.

28. The method of claim 20 , wherein the treatment region extends into the treatable feature from about 75 percent to about 95 percent of the depth of the treatable feature.

29. The method of claim 20 , wherein the component includes a material selected from the group consisting of an alloy including a composition, by weight, of about 13% cobalt, up to about 1.2% iron, about 16% chromium, about 2.1% aluminum, about 3.75% titanium, about 4% tungsten, about 4% molybdenum, about 0.7% niobium, up to about 0.15% manganese, and a balance of nickel; a composition, by weight, of about 8% chromium, about 10% cobalt, about 6% molybdenum, about 1% titanium, about 6% aluminum, about 4% tantalum, about 0.1% carbon, about 0.015% boron, about 0.10% zirconium, and a balance of nickel; an alloy including a composition, by weight, of about 6.4% chromium, about 9.6% cobalt, about 0.6% molybdenum, about 6.4% tungsten, about 5.6% aluminum, about 1.0% titanium, about 6.5% tantalum, about 3% rhenium, about 0.1% hafnium, and a balance of nickel; an alloy including a composition, by weight, of about 8.4% chromium, about 9.5% cobalt, about 5.5% aluminum, about 0.7% titanium, about 9.5% tungsten, about 0.5% molybdenum, about 3% tantalum, about 1.5% hafnium, and a balance of nickel; an alloy including a composition, by weight, of about 8.4% chromium, about 9.5% cobalt, about 5.5% aluminum, about 0.7% titanium, about 9.5% tungsten, about 0.5% molybdenum, about 3% tantalum, about 1.5%

Assignees

• Gen Electric

Inventors

• Whims Lawrence James

Classifications

• F05D2230/80

  Repairing, retrofitting or upgrading methods · CPC title

• C22C21/08

  with silicon · CPC title

• C22C19/058

  without Mo and W · 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