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US4294615A Expired / Lapsed US ⏱️ 0.0 years remaining

Titanium alloys of the TiAl type

Assignee: RTX Corp
•
Filing: 1979-07-25
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Granted: 1981-10-13
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Expires: 1999-07-25
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Abstract

Abstract Cast and forged titanium alloys suited for use at temperatures over 600° C. are based on TiAl gamma phase structure. Useful alloys have about 1.5% or greater tensile ductility at temperatures of 260° C. and below, thereby making them fabricable and suited for engineering applications. Disclosed are alloys having weight percent compositions of 31-36 aluminum, 0-4 vanadium, balance titanium (in atomic percent, about: 45-50Al, 0-3V, bal Ti). The inclusion of about 0.1 weight percent carbon improves creep rupture strength. To obtain high tensile strength, the alloys are forged at about 1025° C. and aged at about 900° C.; to obtain higher creep rupture strength and tensile ductility, a solution anneal at about 1150° C. is interposed before aging.

Inventors

  • 👤 Martin J. Blackburn
  • 👤 Michael P. Smith

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 13:26
CPC Classifications
C; C22; C22C; C22C14/00

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 36 words
A cast and forged titanium alloy with ductility at room temperature and good high temperature strength, consisting essentially of by weight percent 31-36 aluminum, 0.1-4 vanadium, balance titanium (in atomic percent, about: 45-50Al, 0.1V, bal Ti).
Claim 2
Dependent Claim 36 words
A cast and forged titanium alloy with ductility at room temperature and good high temperature strength, consisting essentially of by weight percent 31-36 aluminum, 0.1-4 vanadium, balance titanium (in atomic percent, about: 45-50Al, 0.1V, bal Ti).
Claim 3
Dependent Claim 36 words
A cast and forged titanium alloy with ductility at room temperature and good high temperature strength, consisting essentially of by weight percent 34-36 aluminum, 0.7-2.0 vanadium, balance titanium (in atomic percent, about: 48-50Al, 0.5-1.5V, bal Ti).
Claim 4
Dependent Claim 36 words
A cast and forged titanium alloy with ductility at room temperature and good high temperature strength, consisting essentially of by weight percent 34-36 aluminum, 0.7-2.0 vanadium, balance titanium (in atomic percent, about: 48-50Al, 0.5-1.5V, bal Ti).
Claim 5
Dependent Claim 24 words
The alloys of claims 1 or 2 characterized by tensile elongations of greater than about 1.5% at 20° C. and 3% at 260° C.
Claim 6
Dependent Claim 20 words
The alloys of claims 1 or 2 further having up to 0.1 weight percent carbon to improve creep rupture strength.
Claim 7
Dependent Claim 23 words
The alloys of claims 1 or 2 forged at about 1000°-1050° C. and heat treated at 815°-950° C. to obtain hgh tensile strength.
Claim 8
Dependent Claim 43 words
The alloys of claims 1 or 2 forged at about 1000°-1050° C. with a two step heat treatment consisting of a solution anneal of 1100°-1200° C. followed by an aging treatment of 815°-950° C. to develop high creep-rupture strength and improved tensile ductility.

References Cited (Backward Citations)

CA595980A Cited
CA596202A Cited
CA621884A Cited
GB782564A Cited
US2781261A Cited
US2939786A Cited
US3008823A Cited
US2880087A Cited
US3203794A Cited
US2881105A Cited
US2880089A Cited
US3540878A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1984-10-12 1985-04-13 1985-10-13 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-10-12 1989-04-13 1989-10-13 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-10-12 1993-04-13 1993-10-13 $7700.00 Window Closed / Lapsed

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