US4309226A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of near-alpha titanium alloys
Assignee: Individual
•
Filing: 1980-04-28
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Granted: 1982-01-05
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Expires: 2000-04-28
Abstract
Abstract Process for improving the creep strength of near-alpha titanium alloys by a specific heat treatment schedule which include solution heat treatment prior to conventional aging.
Inventors
- 👤 Charlie C. Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:52
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/16; C22F1/18; C22F1/183
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
170 words
Method for producing a near-alpha titanium alloy having high creep strength in the range from around 900° F. to 1050° F., comprising: (a) forging at a temperature in the alpha+beta or beta temperature ranges a composition consisting essentially by weight of 6% aluminum, 2% tin, 4% zirconium, 2% molybdenum, 0.1% silicon and the remainder titanium, (b) cooling the forged composition to ambient temperature, (c) subjecting the forged composition to solution heat treatment in the temperature range from beta transus +100° F. to beta transus +150° F. for 1 to 4 hours for a composition forged in the alpha and beta temperature range and to solution heat treatment in the temperature range from beta transus -100° F. to beta transus -50° F. for 2 to 8 hours for a composition forged in the beta temperature range, (d) cooling said forged composition to ambient temperature, (e) ageing said forged composition at a temperature of about 1100° F. for at least approximately 8 hours, and (f) cooling said forged composition to ambient temperature.
Claim 2
Dependent Claim
170 words
Method for producing a near-alpha titanium alloy having high creep strength in the range from around 900° F. to 1050° F., comprising: (a) forging at a temperature in the alpha+beta or beta temperature ranges a composition consisting essentially by weight of 6% aluminum, 2% tin, 4% zirconium, 2% molybdenum, 0.1% silicon and the remainder titanium, (b) cooling the forged composition to ambient temperature, (c) subjecting the forged composition to solution heat treatment in the temperature range from beta transus +100° F. to beta transus +150° F. for 1 to 4 hours for a composition forged in the alpha and beta temperature range and to solution heat treatment in the temperature range from beta transus -100° F. to beta transus -50° F. for 2 to 8 hours for a composition forged in the beta temperature range, (d) cooling said forged composition to ambient temperature, (e) ageing said forged composition at a temperature of about 1100° F. for at least approximately 8 hours, and (f) cooling said forged composition to ambient temperature.
Claim 3
Dependent Claim
139 words
Method of providing improved creep properties to a near-alpha titanium alloy forging of nominal composition consisting essentially by weight of 6% aluminum, 2% tin, 4% zirconium, 2% molybdenum, and 0.1% silicon with the balance titanium by restricting the formation of incoherent precipitates of silicon or tin and increasing the formation of fine, dispersed precipitates of silicon or tin, said method comprising: (a) forging an alloy of said composition at a temperature high in alpha+beta temperature range, (b) cooling the forging to ambient temperature, (c) solution heat treating the forging at a temperature between beta transus +100° F. and beta transus +150° F. for 1 to 4 hours, (d) cooling the forging to ambient temperature, (e) ageing the forging at a temperature of about 1100° F. for at least approximately 8 hours, and (f) cooling the forging to ambient temperature.
Claim 4
Dependent Claim
139 words
Method of providing improved creep properties to a near-alpha titanium alloy forging of nominal composition consisting essentially by weight of 6% aluminum, 2% tin, 4% zirconium, 2% molybdenum, and 0.1% silicon with the balance titanium by restricting the formation of incoherent precipitates of silicon or tin and increasing the formation of fine, dispersed precipitates of silicon or tin, said method comprising: (a) forging an alloy of said composition at a temperature high in alpha+beta temperature range, (b) cooling the forging to ambient temperature, (c) solution heat treating the forging at a temperature between beta transus +100° F. and beta transus +150° F. for 1 to 4 hours, (d) cooling the forging to ambient temperature, (e) ageing the forging at a temperature of about 1100° F. for at least approximately 8 hours, and (f) cooling the forging to ambient temperature.
Claim 5
Dependent Claim
139 words
Method of providing improved creep properties to a near-alpha titanium alloy forging of a nominal composition consisting essentially by weight of 6% aluminum, 2% tin, 4% zirconium, 2% molybdenum, and 0.1% silicon with the balance titanium, by restricting the formation of incoherent precipitates of silicon or tin and increasing the formation of fine, dispersed precipitates of silicon or tin, said method comprising: (a) forging an alloy of said composition at a temperature above the beta transus temperature, (b) cooling the forging to ambient temperature, (c) solution heat-treating the forging at a temperature between beta transus -100° F. and beta transus -50° F. for 2 to 8 hours, (d) cooling the forging to ambient temperature, (e) ageing the forging at a temperature of about 1100° F. for at least approximately 8 hours, and (f) cooling the forging to ambient temperature.
Claim 6
Dependent Claim
139 words
Method of providing improved creep properties to a near-alpha titanium alloy forging of a nominal composition consisting essentially by weight of 6% aluminum, 2% tin, 4% zirconium, 2% molybdenum, and 0.1% silicon with the balance titanium, by restricting the formation of incoherent precipitates of silicon or tin and increasing the formation of fine, dispersed precipitates of silicon or tin, said method comprising: (a) forging an alloy of said composition at a temperature above the beta transus temperature, (b) cooling the forging to ambient temperature, (c) solution heat-treating the forging at a temperature between beta transus -100° F. and beta transus -50° F. for 2 to 8 hours, (d) cooling the forging to ambient temperature, (e) ageing the forging at a temperature of about 1100° F. for at least approximately 8 hours, and (f) cooling the forging to ambient temperature.
Claim 7
Dependent Claim
27 words
Method as recited in claim 3, wherein the alloy is forged at a temperature in the range between beta transus +50° F. and beta transus +150° F.
References Cited (Backward Citations)
US3901743A
Cited
US3833363A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-04 | 1985-07-06 | 1986-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-04 | 1989-07-06 | 1990-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-04 | 1993-07-06 | 1994-01-05 | $7700.00 | Window Closed / Lapsed |