US4851055A
Expired / Lapsed
US
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Method of making titanium alloy articles having distinct microstructural regions corresponding to high creep and fatigue resistance
Assignee: United States Department of the Air Force
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Filing: 1988-11-08
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Granted: 1989-07-25
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Expires: 2008-11-08
Abstract
Abstract A method for producing an integral titanium alloy article having at least two regions, each region having a distinct microstructure is provided. The method comprises heat treating one or more selected region(s) of the article at a temperature greater than the beta-transus temperature of the region(s), while simultaneously heat treating the remaining region(s) of the article at a temperature below the beta-transus temperature of the remaining region(s).
Inventors
- 👤 Daniel Eylon
- 👤 Francis H. Froes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:14
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/16; C22F1/18; C22F1/183; B; B22; B22F; B22F3/00; B22F3/001; B22F7/00; B22F7/06; B22F7/062; B22F2999/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
93 words
A method for producing an integral titanium alloy article having at least two regions, each region having a distinct microstructure, which comprises the steps of (a) providing a titanium alloy article; (b) masking one or more selected region(s) of said article using a masking material impervious to the passage of hydrogen therethrough; (c) hydrogenating the thus-masked article to a desired level of hydrogen; (d) heating the thus-hydrogenated article to a temperature between the beta-transus temperature of the hydrogenated region(s) and the beta-transus temperature of the non-hydrogenated region(s); and, (e) cooling the thus-heated article.
Claim 2
Independent Claim
93 words
A method for producing an integral titanium alloy article having at least two regions, each region having a distinct microstructure, which comprises the steps of (a) providing a titanium alloy article; (b) masking one or more selected region(s) of said article using a masking material impervious to the passage of hydrogen therethrough; (c) hydrogenating the thus-masked article to a desired level of hydrogen; (d) heating the thus-hydrogenated article to a temperature between the beta-transus temperature of the hydrogenated region(s) and the beta-transus temperature of the non-hydrogenated region(s); and, (e) cooling the thus-heated article.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein said thus-masked article is hydrogenated to a level of about 0.1 to 0.4 weight percent hydrogen.
Claim 4
Dependent Claim
22 words
The method of claim 1 wherein said thus-masked article is hydrogenated to a level of about 0.5 to 1.5 weight percent hydrogen.
Claim 5
Dependent Claim
10 words
The method of claim 1 wherein said alloy is Ti-6Al-4V.
Claim 6
Dependent Claim
14 words
The method of claim 1 further comprising the step of dehydrogenating the cooled article.
Claim 7
Dependent Claim
25 words
The method of claim 5 wherein said article is dehydrogenated at a temperature about 200°-300° C. below the normal beta transus temperature of said alloy.
Claim 8
Independent Claim
88 words
A method for producing an integral titanium alloy article having at least two regions, each region having a distinct microstructure, which comprises the steps of (a) providing a titanium alloy article; (b) hydrogenating said article to a desired level of hydrogen; (c) locally heating one or more selected region(s) of said article to a temperature above the beta-transus temperature of the thus-hydrogenated article; (d) simultaneously heating the remainder of the thus-hydrogenated article to a temperature below the beta-transus temperature of the thus-hydrogenated article; and, (e) cooling the article.
Claim 9
Independent Claim
88 words
A method for producing an integral titanium alloy article having at least two regions, each region having a distinct microstructure, which comprises the steps of (a) providing a titanium alloy article; (b) hydrogenating said article to a desired level of hydrogen; (c) locally heating one or more selected region(s) of said article to a temperature above the beta-transus temperature of the thus-hydrogenated article; (d) simultaneously heating the remainder of the thus-hydrogenated article to a temperature below the beta-transus temperature of the thus-hydrogenated article; and, (e) cooling the article.
Claim 10
Dependent Claim
21 words
The method of claim 7 wherein said article is hydrogenated to a level of about 0.1 to 4.0 weight percent hydrogen.
Claim 11
Dependent Claim
21 words
The method of claim 7 wherein said article is hydrogenated to a level of about 0.5 to 1.5 weight percent hydrogen.
Claim 12
Dependent Claim
10 words
The method of claim 7 wherein said alloy is Ti-6Al-4V.
Claim 13
Dependent Claim
14 words
The method of claim 7 further comprising the step of dehydrogenating the cooled article.
Claim 14
Dependent Claim
25 words
The method of claim 11 wherein said article is dehydrogenated at a temperature about 200°-300° C. below the normal beta transus temperature of said alloy.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |