Patent US6194754B1 successfully refreshed from Google Patents.
Patent EP0248757A1 successfully refreshed from Google Patents.
EP0248757A1
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EP
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Nickel base superalloy articles and method for making
Assignee: RTX Corp
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Filing: 1987-04-16
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Granted: —
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Expires: 2007-04-16
Abstract
Abstract A process is described for converting a fine grain superalloy casting into a forging having mechanical properties equivalent to those resulting from powder metallurgy processing. Cast material is extruded and forged. A HIP treatment is employed to close porosity.
Inventors
- 👤 Paul Damian Genereux
- 👤 Daniel Francis Paulonis
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 06:13
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/10
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
100 words
Method of providing a nickel base superalloy forging preform, characterized in including the steps of a. providing a fine grain cast ingot b. heat treating the ingot to produce an overaged noneutectic gamma prime microstructure c. extruding the heat treated ingot at a reduction in area sufficient to produce a completely recrystallized fine grain microstructure d. hot isostatic pressing the extruded material to close all voids and porosity at a temperature low enough to prevent significant grain growth whereby the resultant article will have a fine grain size, a coarse gamma prime size and will be suited for subsequent forging.
Claim 2
Dependent Claim
100 words
Method of providing a nickel base superalloy forging preform, characterized in including the steps of a. providing a fine grain cast ingot b. heat treating the ingot to produce an overaged noneutectic gamma prime microstructure c. extruding the heat treated ingot at a reduction in area sufficient to produce a completely recrystallized fine grain microstructure d. hot isostatic pressing the extruded material to close all voids and porosity at a temperature low enough to prevent significant grain growth whereby the resultant article will have a fine grain size, a coarse gamma prime size and will be suited for subsequent forging.
Claim 3
Dependent Claim
95 words
Method of producing a nickel base superalloy forging from a fine grain cast ingot which contains more than about 40 % by volume of the gamma prime phase, including the steps of a. heat treating the ingot to produce an overaged noneutectic gamma prime particle microstructure b: extruding the heat treated ingot at a reduction in area sufficient to produce a completely recrystallized fine grain microstructure c. hot isostatic pressing the extruded material to close voids and porosity at a temperature low enough to prevent significant grain growth d. forging the material using heated die.
Claim 4
Dependent Claim
95 words
Method of producing a nickel base superalloy forging from a fine grain cast ingot which contains more than about 40 % by volume of the gamma prime phase, including the steps of a. heat treating the ingot to produce an overaged noneutectic gamma prime particle microstructure b: extruding the heat treated ingot at a reduction in area sufficient to produce a completely recrystallized fine grain microstructure c. hot isostatic pressing the extruded material to close voids and porosity at a temperature low enough to prevent significant grain growth d. forging the material using heated die.
Claim 5
Dependent Claim
96 words
Method of producing a nickel base superalloy forging from a fine grain cast ingot which contains more than about 40 % by volume of the gamma prime phase, including the steps of a. heat treating the ingot to produce an overage noneutectic gamma prime particle microstructure b. extruding the heat treated ingot at a reduction in area sufficient to produce a completely recrystallized fine grain microstructure c. forging the extruded material using heated dies. d. hot isostatic pressing the forged material to close voids and porosity at a temperature low enough to prevent significant grain growth.
Claim 6
Dependent Claim
96 words
Method of producing a nickel base superalloy forging from a fine grain cast ingot which contains more than about 40 % by volume of the gamma prime phase, including the steps of a. heat treating the ingot to produce an overage noneutectic gamma prime particle microstructure b. extruding the heat treated ingot at a reduction in area sufficient to produce a completely recrystallized fine grain microstructure c. forging the extruded material using heated dies. d. hot isostatic pressing the forged material to close voids and porosity at a temperature low enough to prevent significant grain growth.
Claim 7
Dependent Claim
88 words
Method of providing a nickel base superalloy fcrging preform, including the steps of a. providing a fine grain cast ingot b. extruding the heat treated ingot at a reduction ratio in excess of about 4:1 to produce a completely recrystallized fine grain microstructure c. hot isostatic pressing the extruded material to close all voids and porosity at a temperature low enough to prevent significant grain growth whereby the resultant article will have a fine grain size, a coarse gamma prime size and will be suited for subsequent forging.
Claim 8
Dependent Claim
88 words
Method of providing a nickel base superalloy fcrging preform, including the steps of a. providing a fine grain cast ingot b. extruding the heat treated ingot at a reduction ratio in excess of about 4:1 to produce a completely recrystallized fine grain microstructure c. hot isostatic pressing the extruded material to close all voids and porosity at a temperature low enough to prevent significant grain growth whereby the resultant article will have a fine grain size, a coarse gamma prime size and will be suited for subsequent forging.
Claim 9
Dependent Claim
84 words
Method of producing a nickel base superalloy forging from a fine grain cast ingot which contains more than about 40 % by volume of the gamma prime phase, including the steps of a. extruding the heat treated ingot at a reduction ratio in excess of about 4:1 to produce a completely recrystallized fine grain microstructure b. hot isostatic pressing the extruded material to close voids and porosity at a temperature low enough to prevent significant grain growth c. forging the material using heated dies.
Claim 10
Dependent Claim
84 words
Method of producing a nickel base superalloy forging from a fine grain cast ingot which contains more than about 40 % by volume of the gamma prime phase, including the steps of a. extruding the heat treated ingot at a reduction ratio in excess of about 4:1 to produce a completely recrystallized fine grain microstructure b. hot isostatic pressing the extruded material to close voids and porosity at a temperature low enough to prevent significant grain growth c. forging the material using heated dies.
Claim 11
Dependent Claim
84 words
Method of producing a nickel base superalloy forging from a fine grain cast ingot which contains more than about 40 % by volume of the gamma prime phase, including the steps of a. extruding the heat treated ingot at a reduction ratio greater than about 4:1 to produce a completely recrystallized fine grain microstructure b. forging the extruded material using heated dies c. hot isostatic pressing the forged material to close voids and porosity at a temperature low enough to prevent significant grain growth.
Claim 12
Dependent Claim
84 words
Method of producing a nickel base superalloy forging from a fine grain cast ingot which contains more than about 40 % by volume of the gamma prime phase, including the steps of a. extruding the heat treated ingot at a reduction ratio greater than about 4:1 to produce a completely recrystallized fine grain microstructure b. forging the extruded material using heated dies c. hot isostatic pressing the forged material to close voids and porosity at a temperature low enough to prevent significant grain growth.
Claim 13
Dependent Claim
48 words
Method according to anyone of the claims 1-6 characterized in that cast ingot consists of (by weight) 5-25% Co, 8-20% Cr, 1-6% Al, 1-5% Ti, 0-6% Mo, 0-7% W, 0-5% Nb, 0-5% Ta, 0-5% Re, 0-2% Hf, 9-2% V, 0-0.5% C, 0-0.15% B, 0-0.15% Zr, balance essentially Ni.
Claim 14
Dependent Claim
28 words
Method according to anyone of the claims 1-6 characterized in that the starting grain size (at the ingot surface) is no larger than about 3.17 mm (1/8 inch).
Claim 15
Dependent Claim
68 words
Method according to anyone of the claimsl-3 characterized in that the heat treatment step includes cooling the material from a temperature at which at least 40% by volume of the noneutectic gamma prime phase is dissolved in the matrix to a temperature below the noneutectic gamma prime solvus start temperature at a rate of less than about 8.3 C/cm (15 F/hr) to significantly coarsen the gamma prime particles.
Claim 16
Dependent Claim
17 words
Method according to anyone of the claimsl-3 characterized in that the material is canned prior to extrusion.
Claim 17
Dependent Claim
24 words
Method according to anyone of the claims 1-3 characterized in that the material is extruded with a reduction in area greater than about 2.5:1.
Claim 18
Dependent Claim
20 words
Method according to anyone of the claims 1-3 characterized in that the recrystallized grain size is ASTM 8-10 or finer.
Claim 19
Dependent Claim
24 words
Method according to anyone of the claims 1-3 characterized in that the material is extruded with a reduction in area greater than about 3.5:1.
Claim 20
Dependent Claim
24 words
Method according to anyone of the claims 1-3 characterized in that the gamma prime particle size after the heat treatment exceeds about 1.5 µm.
Claim 21
Dependent Claim
24 words
Method according to anyone of the claims 1-3 characterized in that the gamma prime particle size after the heat treatment exceeds about 4 µm.
References Cited (Backward Citations)
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