Patent US5039356A successfully refreshed from Google Patents.
US5039356A
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Method to produce fatigue resistant axisymmetric titanium alloy components
Assignee: United States Department of the Air Force
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Filing: 1990-08-24
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Granted: 1991-08-13
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Expires: 2010-08-24
Abstract
Abstract An improved process for producing near-alpha and alpha+beta titanium alloy axisymmetric components with high fatigue resistance which comprises the steps of: (a) providing a beta processed near-alpha or alpha+beta titanium alloy component; (b) torque deforming the component; and (c) alpha+beta recrystallization annealing the resulting torque-deformed component.
Inventors
- 👤 Isaac Weiss
- 👤 Daniel Eylon
- 👤 Gerhard E. Wesch
- 👤 Francis H. Froes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:23
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/16; C22F1/18; C22F1/183
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
45 words
An improved process for producing near-alpha and alpha+beta titanium alloy axisymmetric components with high fatigue resistance which comprises the steps of: (a) providing a beta processed near-alpha or alpha+beta titanium alloy component; (b) torque deforming said component; and (c) alpha+beta annealing the resulting torque-deformed component.
Claim 2
Dependent Claim
45 words
An improved process for producing near-alpha and alpha+beta titanium alloy axisymmetric components with high fatigue resistance which comprises the steps of: (a) providing a beta processed near-alpha or alpha+beta titanium alloy component; (b) torque deforming said component; and (c) alpha+beta annealing the resulting torque-deformed component.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein said providing step (a) consists of beta annealing said component.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein said providing step (a) consists of beta extruding said component.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein said providing step (a) consists of beta forging said component.
Claim 6
Dependent Claim
34 words
The process of claim 1 wherein said torque deforming step (b) consists essentially of: (i) heating said component to an elevated temperature; (ii) applying twisting deformation to said component; and (iii) cooling said component.
Claim 7
Dependent Claim
42 words
The process of claim 1 wherein said annealing step (c) consists of heating the deformed component from step (b) at a temperature about 1 to 20% below the beta-transus temperature for about 1/2 to 8 hours, and air cooling the thus-heated component.
Claim 8
Dependent Claim
11 words
The process of claim 1 wherein said titanium alloy is Ti-6Al-2Sn-4Zr-2Mo.
Claim 9
Dependent Claim
30 words
The process of claim 5 wherein said heating step (i) consists of heating said component to a temperature about 1 to 30 percent below the beta-transus temperature of said alloy.
Claim 10
Dependent Claim
30 words
The process of claim 5 wherein said heating step (i) consists of heating said component to a temperature about 2 to 15 percent below the beta-transus temperature of said alloy.
Claim 11
Dependent Claim
24 words
The process of claim 5 wherein said twisting step (ii) consists of applying twisting deformation sufficient to achieve at least about 60% effective strain.
Claim 12
Dependent Claim
18 words
The process of claim 10 wherein the twist applied is about 1 to 5 radians per centimeter length.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-12 | 1995-02-11 | 1995-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-12 | 1999-02-11 | 1999-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-12 | 2003-02-11 | 2003-08-13 | $7700.00 | Window Closed / Lapsed |