US4287740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of increasing the fatigue life of titanium alloy parts
Assignee: Boeing North American Inc
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Filing: 1978-09-12
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Granted: 1981-09-08
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Expires: 1998-09-12
Abstract
Abstract A method of increasing the fatigue life of a metal part of a titanium alloy by subjecting it to the steps of abrasive cleaning and shot peening.
Inventors
- 👤 Arun Kumar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:26
CPC Classifications
B; B24; B24C; B24C11/00; B24C1/00; B24C1/10; C; C22; C22F; C22F1/00; C22F1/16; C22F1/18; C22F1/183
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
86 words
A method of increasing the fatigue life of a part made of titanium alloy, which comprises subjecting the part to the steps of first abrasive cleaning and thereafter shot peening, said abrasive cleaning comprising blasting the surface of said part with particles having a diameter within the range of about 0.0024 to 0.0082 inches at a blast pressure within the range of about 10 to 50 p.s.i., said step of shot peening using a higher intensity and larger particle size than said step of abrasive cleaning.
Claim 2
Independent Claim
86 words
A method of increasing the fatigue life of a part made of titanium alloy, which comprises subjecting the part to the steps of first abrasive cleaning and thereafter shot peening, said abrasive cleaning comprising blasting the surface of said part with particles having a diameter within the range of about 0.0024 to 0.0082 inches at a blast pressure within the range of about 10 to 50 p.s.i., said step of shot peening using a higher intensity and larger particle size than said step of abrasive cleaning.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein said blast pressure is approximately 30 psi and said particles have a diameter of approximately 0.0041 inch.
Claim 4
Dependent Claim
13 words
The method of claim 2 wherein said particles are of aluminum oxide grit.
Claim 5
Dependent Claim
24 words
The method of claim 5 also including the step of alkaline cleaning after the step of abrasive cleaning and before the step of shot-peening.
Claim 6
Dependent Claim
42 words
The method of claim 4 wherein said shot peening is with shot having a diameter in the range of about 0.017 to 0.039 inches, with Almen intensity in the range of about 0.010 to 0.030, and with 100 to 200% surface coverage.
Claim 7
Dependent Claim
19 words
The method of claim 5 wherein said surface coverage is 200%, and said titanium alloy is a beta-titanium alloy.
Claim 8
Dependent Claim
13 words
The method of claim 6 wherein said shot is of corrosion resistant steel.
Claim 9
Dependent Claim
42 words
The method of claim 1 wherein said shot peening is with shot having a diameter in the range of about 0.017 to 0.039 inches, with Almen intensity in the range of about 0.010 to 0.030, and with 100 to 200% surface coverage.
References Cited (Backward Citations)
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US2351726A
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US3073022A
Cited
US3188776A
Cited
US3410124A
Cited
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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) | 1984-09-07 | 1985-03-09 | 1985-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-07 | 1989-03-09 | 1989-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-07 | 1993-03-09 | 1993-09-08 | $7700.00 | Window Closed / Lapsed |