US4543132A
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Processing for titanium alloys
Assignee: RTX Corp
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Filing: 1983-10-31
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Granted: 1985-09-24
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Expires: 2003-10-31
Abstract
Abstract Process for improving the crack growth behavior of titanium alloys containing substantial beta stabilizers and at least 3% molybdenum, such as Ti-6-2-4-6. The process includes the steps of forging above the beta transus temperature, cooling at a controlled rate through the beta transus temperature, heating to a temperature between 50°-150° F. below the beta transus temperature, cooling the alloy at a rate in excess of that produced by air cooling, and aging the material between about 900° F. and 1100° F. The resultant material has substantially improved crack growth behavior when contrasted with material processed according to the prior art.
Inventors
- 👤 Douglas M. Berczik
- 👤 George Brodi
- 👤 Thomas E. O'Connell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:48
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/16; C22F1/18; C22F1/183
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
108 words
Method for improving the crack growth behavior of alpha-beta titanium material containing substantial amounts of beta stabilizers and at least 3% Mo, and having a beta transus temperature, including the steps of a. forging the material above the beta transus an amount sufficient to produce recrystallization b. cooling the material, through the beta transus, at a rate of from about 20° to about 100° F. per minute c. heat treating the material at a temperature between about 50° and about 150° F. below the beta transus d. cooling the alloy at a rate equal to or in excess of that produced by air cooling e. aging the material.
Claim 2
Dependent Claim
108 words
Method for improving the crack growth behavior of alpha-beta titanium material containing substantial amounts of beta stabilizers and at least 3% Mo, and having a beta transus temperature, including the steps of a. forging the material above the beta transus an amount sufficient to produce recrystallization b. cooling the material, through the beta transus, at a rate of from about 20° to about 100° F. per minute c. heat treating the material at a temperature between about 50° and about 150° F. below the beta transus d. cooling the alloy at a rate equal to or in excess of that produced by air cooling e. aging the material.
Claim 3
Dependent Claim
22 words
Method as in claim 1 wherein the forging step is performed at between about 25° and 65° F. above the beta transus.
Claim 4
Dependent Claim
21 words
Method as in claim 1 wherein the material is forged an amount equivalent to at least a 10% reduction in area.
Claim 5
Dependent Claim
21 words
Method as in claim 1 wherein the material is forged an amount equivalent to at least a 25% reduction in area.
Claim 6
Dependent Claim
18 words
Method as in claim 1 wherein in step b, the material is cooled to below about 1000° F.
Claim 7
Dependent Claim
18 words
Method as in claim 1 wherein the heat treatment in step c is performed for about 0.5-5 hours.
Claim 8
Dependent Claim
18 words
Method as in claim 1 wherein in step d the material is cooled to below about 500° F.
Claim 9
Dependent Claim
28 words
Method as in claim 1 wherein in step e, the aging is performed between about 900° F. and 1100° F. for from about 2 to about 10 hours.
Claim 10
Dependent Claim
10 words
Method as in claim 1 wherein the alloy is Ti-6-2-4-6.
Claim 11
Dependent Claim
138 words
Method for thermomechanically processing titanium alloy articles (nominal composition 6% Al, 2% Sn, 4% Zr, 6% Mo, balance essentially Ti) including the steps of a. forging the material an amount equivalent to at least a 10% reduction area at a temperature between about 25% and about 65% above the gamma prime solvus b. cooling the material to below about 1000° F. at a rate between about 20° and above 100° F. per minute c. heat treating the material at a temperature between about 50° F. and 150° F. below the gamma prime solvus for about 0.5-5 hours d. cooling the material to below about 500° F. at a rate equal or in excess of that produced by air cooling e. aging the material for about 2-10 hours at a temperature between about 900° F. and about 1200° F.
Claim 12
Dependent Claim
138 words
Method for thermomechanically processing titanium alloy articles (nominal composition 6% Al, 2% Sn, 4% Zr, 6% Mo, balance essentially Ti) including the steps of a. forging the material an amount equivalent to at least a 10% reduction area at a temperature between about 25% and about 65% above the gamma prime solvus b. cooling the material to below about 1000° F. at a rate between about 20° and above 100° F. per minute c. heat treating the material at a temperature between about 50° F. and 150° F. below the gamma prime solvus for about 0.5-5 hours d. cooling the material to below about 500° F. at a rate equal or in excess of that produced by air cooling e. aging the material for about 2-10 hours at a temperature between about 900° F. and about 1200° F.
Claim 13
Dependent Claim
64 words
A titanium alloy article resistant to crack growth which comprises: a. a beta matrix containing b. from about 20 to about 90 volume percent alpha platelets having an average 1/d of between about 4 and about 20 c. said needles being surrounded by a thin layer having a high Mo content d. said material being substantially free of any continuous grain boundary alpha phase.
Claim 14
Dependent Claim
64 words
A titanium alloy article resistant to crack growth which comprises: a. a beta matrix containing b. from about 20 to about 90 volume percent alpha platelets having an average 1/d of between about 4 and about 20 c. said needles being surrounded by a thin layer having a high Mo content d. said material being substantially free of any continuous grain boundary alpha phase.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-23 | 1989-03-25 | 1989-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-23 | 1993-03-25 | 1993-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-23 | 1997-03-25 | 1997-09-24 | $7700.00 | Window Closed / Lapsed |