Metastable beta-titanium alloys and methods of processing the same by direct aging
First Claim
Patent Images
1. A method of processing a binary metastable β
- -titanium alloy consisting essentially of titanium and at least 14 weight percent molybdenum, the method-comprising;
hot working a binary metastable β
-titanium alloy consisting essentially of titanium and at least 14 weight percent molybdenum at a hot working temperature above the β
-transus temperature of the binary metastable β
-titanium alloy, wherein the binary metastable β
-titanium alloy is hot worked to a percent reduction in area ranging from 95% to 99%; and
direct aging the binary metastable β
-titanium alloy, wherein direct aging comprises heating the binary metastable β
-titanium alloy in the hot worked condition at an aging temperature ranging from 850°
F. to 1375°
F. for a time sufficient to form α
-phase precipitates within the binary metastable β
-titanium alloy.
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Abstract
Metastable beta titanium alloys and methods of processing metastable β-titanium alloys are disclosed. For example, certain non-limiting embodiments relate to metastable β-titanium alloys, such as binary β-titanium alloys comprising greater than 10 weight percent molybdenum, having tensile strengths of at least 150 ksi and elongations of at least 12 percent. Other non-limiting embodiments relate to methods of processing metastable β-titanium alloys, and more specifically, methods of processing binary β-titanium alloys comprising greater than 10 weight percent molybdenum, wherein the method comprises hot working and direct aging the metastable β-titanium alloy at a temperature below the β-transus temperature of the metastable β-titanium alloy for a time sufficient to form α-phase precipitates in the metastable β-titanium alloy. Articles of manufacture comprising binary β-titanium alloys according to various non-limiting embodiments disclosed herein are also disclosed.
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Citations
36 Claims
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1. A method of processing a binary metastable β
- -titanium alloy consisting essentially of titanium and at least 14 weight percent molybdenum, the method-comprising;
hot working a binary metastable β
-titanium alloy consisting essentially of titanium and at least 14 weight percent molybdenum at a hot working temperature above the β
-transus temperature of the binary metastable β
-titanium alloy, wherein the binary metastable β
-titanium alloy is hot worked to a percent reduction in area ranging from 95% to 99%; anddirect aging the binary metastable β
-titanium alloy, wherein direct aging comprises heating the binary metastable β
-titanium alloy in the hot worked condition at an aging temperature ranging from 850°
F. to 1375°
F. for a time sufficient to form α
-phase precipitates within the binary metastable β
-titanium alloy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- -titanium alloy consisting essentially of titanium and at least 14 weight percent molybdenum, the method-comprising;
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9. A method of processing a metastable β
- -titanium alloy comprising greater than 10 weight percent molybdenum, the method comprising;
hot working a metastable β
-titanium alloy comprising titanium and greater than 10 weight percent molybdenum above the β
-transus temperature of the metastable β
-titanium alloy; anddirect aging the metastable β
-titanium alloy, wherein direct aging comprises;heating the metastable β
-titanium alloy in the hot worked condition at a first aging temperature below the β
-transus temperature of the metastable β
-titanium alloy for a time sufficient to form and at least partially coarsen at least one α
-phase precipitate within at least a portion of the metastable β
-titanium alloy; and
subsequentlyheating the metastable β
-titanium alloy at a second aging temperature that is lower than the first aging temperature for a time sufficient to form at least one additional α
-phase precipitate within at least a portion of the metastable β
-titanium alloy. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
- -titanium alloy comprising greater than 10 weight percent molybdenum, the method comprising;
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26. A method of processing a metastable β
- -titanium alloy comprising titanium and greater than 10 weight percent molybdenum, the method comprising;
hot working a metastable β
-titanium alloy comprising titanium and greater than 10 weight percent molybdenum above the β
-transus temperature of the metastable β
-titanium alloy; anddirect aging the metastable β
-titanium alloy, wherein direct aging comprises;heating the metastable β
-titanium alloy in the hot worked condition at a first aging temperature ranging from 1225°
F. to 1375°
F. for at least 0.5 hours to form and at least partially coarsen at least one α
-phase precipitate within at least a portion of the metastable β
-titanium alloy; and
subsequentlyheating the metastable β
-titanium alloy at a second aging temperature ranging from 850°
F. to 1000°
F. for at least 0.5 hours to form at least one additional fine α
-phase precipitate within at least a portion of the metastable β
-titanium alloy. - View Dependent Claims (27, 28)
- -titanium alloy comprising titanium and greater than 10 weight percent molybdenum, the method comprising;
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29. A method of processing a binary metastable β
- -titanium alloy comprising titanium, at least 14 weight percent molybdenum, and other components that do not substantially change the thermodynamic equilibrium behavior of the binary metastable β
-titanium alloy, the method-comprising;hot working a binary metastable β
-titanium alloy comprising titanium, at least 14 weight percent molybdenum, and other components that do not substantially change the thermodynamic equilibrium behavior of the a binary metastable β
-titanium alloy at a hot working temperature above the β
-transus temperature of the binary metastable β
-titanium alloy, wherein the binary metastable β
-titanium alloy is hot worked to a percent reduction in area ranging from 95% to 99%; anddirect aging the binary metastable β
-titanium alloy, wherein direct aging comprises heating the binary metastable β
-titanium alloy in the hot worked condition at an aging temperature ranging from 850°
F. to 1375°
F. for a time sufficient to form α
-phase precipitates within the binary metastable β
-titanium alloy. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36)
- -titanium alloy comprising titanium, at least 14 weight percent molybdenum, and other components that do not substantially change the thermodynamic equilibrium behavior of the binary metastable β
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Current AssigneeATI Properties LLC (CNH Industrial N.V.)
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Original AssigneeATI Properties Incorporated (Allegheny Technologies Incorporated)
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InventorsFreese, Howard L., Jablokov, Victor R., Marquardt, Brian, Wood, John Randolph
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Primary Examiner(s)King; Roy
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Assistant Examiner(s)ROE, JESSEE RANDALL
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Application NumberUS11/057,614Publication NumberTime in Patent Office2,108 DaysField of Search148/670, 148/671US Class Current148/671CPC Class CodesC22C 14/00 Alloys based on titaniumC22F 1/183 of titanium or alloys based...
