US4053330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for improving fatigue properties of titanium alloy articles
Assignee: RTX Corp
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Filing: 1976-04-19
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Granted: 1977-10-11
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Expires: 1996-04-19
Abstract
Abstract A thermomechanical treatment to improve the fatigue strength of articles made from one of a class of alpha beta titanium alloys. The treatment involves heating the alloy into the beta field, hot deforming the alloy at a temperature within the beta field, rapidly quenching the alloy to room temperature to produce a hexagonal martensite structure and then tempering at an intermediate temperature so as to produce a structure in which discrete equiaxed beta phase particles are presented in an acicular alpha matrix. This structure is particularly resistant to the initiation and propagation of fatigue cracks.
Inventors
- 👤 Robert Jacobi Henricks
- 👤 Duane Louis Ruckle
- 👤 Raymond Bender Slack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:30
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/16; C22F1/18; C22F1/183
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
144 words
A thermomechanical process to improve the fatigue properties of titanium alloys of the class which contain both alpha and beta stabilizers and contain from about 5 to about 20 volume percent of the beta phase under equilibrium conditions at room temperature, including the steps of: a. providing the alloy; b. heating the alloy to a temperature above the beta transus for a period of time sufficient to produce a structure which is substantially all beta; c. hot deforming the alloy at a temperature above the beta transus, an amount sufficient to refine the beta grain size; d. rapidly quenching the alloy to produce an acicular martensitic structure; e. tempering the martensite by reheating to an elevated temperature below the beta transus for a period of time sufficient to partially convert the martensite to acicular alpha, while permitting the formation of discrete equiaxed beta particles.
Claim 2
Dependent Claim
144 words
A thermomechanical process to improve the fatigue properties of titanium alloys of the class which contain both alpha and beta stabilizers and contain from about 5 to about 20 volume percent of the beta phase under equilibrium conditions at room temperature, including the steps of: a. providing the alloy; b. heating the alloy to a temperature above the beta transus for a period of time sufficient to produce a structure which is substantially all beta; c. hot deforming the alloy at a temperature above the beta transus, an amount sufficient to refine the beta grain size; d. rapidly quenching the alloy to produce an acicular martensitic structure; e. tempering the martensite by reheating to an elevated temperature below the beta transus for a period of time sufficient to partially convert the martensite to acicular alpha, while permitting the formation of discrete equiaxed beta particles.
Claim 3
Dependent Claim
34 words
A process as in claim 1 wherein the tempering step is performed at a temperature of between about 1000° F. and 1600° F. for a time of from about 1 to about 24 hours.
Claim 4
Dependent Claim
34 words
A process as in claim 1 wherein the alloy is chosen from the group consisting of Ti--6% Al--4% V, Ti--8% Al--1% Mo--1% V, Ti--6% Al--2% Sn--4% Zr--2% Mo and Ti--6% Al--2% Sn--4% Zr--6% Mo.
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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) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |