Patent EP0260513A2 successfully refreshed from Google Patents.
EP0260513A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method of forming fatigue crack resistant nickel base superalloys and product formed
Assignee: General Electric Co
•
Filing: 1987-08-31
•
Granted: —
•
Expires: 2007-08-31
Abstract
Abstract A novel nickel base superalloy is provided. The alloy is unique in having a high enough concentration of γʹ strengthening precipitate to provide a valuable set of physical properties and yet retain forgeability properties similar to those of alloys having lower concentration of precipitate. The nickel base superalloy has the following composition:
Inventors
- 👤 Keh-Minn Chang
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 05:09
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/056; C22F; C22F1/00; C22F1/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
17 words
A nickel base superalloy which comprises an alloy having the following approximate composition in percentage by weight.:
Claim 2
Dependent Claim
17 words
A nickel base superalloy which comprises an alloy having the following approximate composition in percentage by weight.:
Claim 3
Dependent Claim
14 words
The alloy of claim 1 which contains about 45 volume percent of γʹ precipitate.
Claim 4
Dependent Claim
19 words
The alloy of claim 1 which has a relatively high percentage content of γʹ precipitate but which retains forgeability.
Claim 5
Dependent Claim
13 words
The alloy of claim 1 which has been supersolvus annealed and slowly cooled.
Claim 6
Dependent Claim
17 words
The alloy of claim 1 in which the average grain diameter is less than about 30 µm.
Claim 7
Independent Claim
53 words
The method of preparing a nickel-base superalloy which has a high content of γʹ precipitate but which retains good forgeability which comprises. preparing a melt to contain the following ingredieents, casting the melt to form an ingot, supersolvus annealing the ingot, slowly cooling the ingot after the anneal at a rate below 250°F/min.
Claim 8
Independent Claim
53 words
The method of preparing a nickel-base superalloy which has a high content of γʹ precipitate but which retains good forgeability which comprises. preparing a melt to contain the following ingredieents, casting the melt to form an ingot, supersolvus annealing the ingot, slowly cooling the ingot after the anneal at a rate below 250°F/min.
Claim 9
Dependent Claim
14 words
The alloy of claim 6 wherein the alloy is aged following the slow cooling.
Claim 10
Dependent Claim
13 words
The alloy of claim 6 wherein the supersolvus anneal is at about 1125°C.
Claim 11
Dependent Claim
17 words
The alloy of claim 6 wherein the volume percent of precipitate formed is about 45 volume percent.
Claim 12
Dependent Claim
14 words
The method of claim 6 wherein the cast alloy is forged to final shape.
Claim 13
Dependent Claim
15 words
The method of claim 6 in which the alloy is chamber cooled and then aged.
Claim 14
Dependent Claim
28 words
The method of claim 6 wherein the anneal is done at 1050°C and the alloy displays a slightly better fatigue crack propagation resistance rate for hold time tests.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.