EP0024142A1
Expired / Lapsed
EP
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Method for repairing a crack in a superalloy material and an article when so repaired
Assignee: Chromalloy American Corp
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Filing: 1980-07-30
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Granted: —
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Expires: 2000-07-30
Abstract
Abstract Cracks in articles made from superalloys are braze repaired after notching or cutting away material adjacent the cracks, the repaired superalloy article exhibiting the desirable properties of high strength and low distortion.
Inventors
- 👤 Robert L. Rothman
- 👤 Gregor Baladjanian
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 23:41
CPC Classifications
B; B23; B23P; B23P6/00; B23P6/002; B23P6/007; B22; B22F; B22F1/00; B22F1/09; B23K; B23K1/00; B23K1/008; B23K1/19; B23K1/20; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/3033; B23K35/304; B23P6/04; B23P6/045; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49718; Y10T29/49721; Y10T29/49723; Y10T29/49725; Y10T29/49726; Y10T29/49728; Y10T29/49746
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
223 words
A method for repairing a crack in an article consisting of a superalloy material having Ni or Co as a base material, the crack extending into the article from the surface thereof, the method being characterized by a) mechanically removing said material adjacent that part of the crack that extends from said surface down into the article, thereby to form in the article a recess whose walls are oxide free, b) filling into the recess a braze mix that consists essentially of first and second portions in powdered state, the first portion consisting essentially of said superalloy material or a material analogous thereto, and the second portion consisting essentially of a braze component containing a melting point depressant, c) subjecting said mix in the recess and the article material adjacent the recess to first elevated temperature under vacuum conditions for causing said mix to form a melt, said first elevated temperature being less than the melting temperature of said material adjacent the recess, and d) thereafter subjecting the melt and the article material adjacent the recess to second elevated temperature or temperatures near said first elevated temperature and for an extended time sufficient to diffuse the depressant out of the melt into the recess wall and into the first portion of the mix, and thereby to increase the melting temperature of said melt.
Claim 2
Dependent Claim
34 words
A method as claimed in claim 1, characterized in that said mechanical removal of the material adjacent the crack includes cutting away the superalloy material of said article adjacent opposite sides of the crack.
Claim 3
Dependent Claim
33 words
A method as claimed in claim 1 or claim 2, characterized in that it is carried out to repair a crack extent associated with weld repair of a primary crack in the article.
Claim 4
Independent Claim
48 words
A method as claimed in any preceding claim, characterized in that the crack extends completely through the article between opposite sides thereof and said mechanical removal step is carried out to completely remove article material between said opposite sides so that said recess communicates between said opposite sides.
Claim 5
Independent Claim
21 words
A method as claimed in any preceding claim, characterized in that said first elevated temperature is between about 2125°F and 2175°F.
Claim 6
Dependent Claim
22 words
A method as claimed in claim 5, characterized in that said second elevated temperature is between about 2050°F and 2150 0 F.
Claim 7
Dependent Claim
43 words
A method as claimed in claim 6, characterized in that said extended time includes a primary interval during which the second elevated temperature remains at about 2050°F, and a secondary interval during which the second elevated temperature remains at about 2150 o F.
Claim 8
Dependent Claim
24 words
A method as claimed in claim 7, characterized in that said primary interval is'about 3 hours, and said secondary interval is about 4 hours.
Claim 9
Dependent Claim
30 words
A method as claimed in claim 5, characterized in that said subjecting of the mix to said first elevated temperature is continued for a time interval of about 30 minutes.
Claim 10
Independent Claim
17 words
A method as claimed in any preceding claim, characterized in that said superalloy consists of Rene 80.
Claim 11
Independent Claim
19 words
A method as claimed in any of claims 1 to 9, characterized in that said superalloy consists of X-40.
Claim 12
Independent Claim
31 words
A method as claimed in any preceding claim, characterized in that the article initially has a surface coat, including the initial step of removing said coat, at least adjacent the crack.
Claim 13
Independent Claim
17 words
A method as claimed in any preceding claim, characterized in that the article comprises a turbine vane.
Claim 14
Dependent Claim
23 words
A method as claimed in claim 10, characterized in that said first and second portions of the mix are about equal in weight.
Claim 15
Dependent Claim
19 words
A method as claimed in claim 14, characterized in that said second portion of the mix consists of BRB.
Claim 16
Dependent Claim
29 words
A method as claimed in claim 13, characterized in that said mix consists of about 40% by weight of X-40 and about 60% by weight of said second portion.
Claim 17
Dependent Claim
20 words
A method as claimed in claim 16, characterized in that said second portion of the mix consists of AMS 4783.
Claim 18
Independent Claim
16 words
A method as claimed in any preceding claim, characterised in that said depressant consists of boron.
Claim 19
Dependent Claim
16 words
An article characterised in that it has been repaired by the method of any preceding claim.
References Cited (Backward Citations)
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