Processing of titanium-aluminum-vanadium alloys and products made thereby
First Claim
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1. A method of forming an article from an α
- −
β
titanium alloy consisting of, in weight percentages, from 2.9 to 5.0 aluminum, from 2.0 to 3.0 vanadium, from 0.4 to 2.0 iron, from 0.2 to 0.3 oxygen, from 0.005 to 0.3 carbon, from 0.001 to 0.02 nitrogen, from 0 to 0.1 chromium, from 0 to 0.1 nickel, incidental impurities, and titanium, the method consisting of;
α
−
β
working the α
−
β
titanium alloy at a temperature greater than 1600°
F. to provide the α
−
β
titanium alloy with a microstructure conducive to subsequent cold deformation; and
cold working the α
−
β
titanium alloy at a temperature in the range of ambient temperature to less than 1250°
F.;
wherein the article has tensile strength of at least 120 ksi and ultimate tensile strength of at least 130 ksi.
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Abstract
A method of forming an article from an α−β titanium including, in weight percentages, from about 2.9 to about 5.0 aluminum, from about 2.0 to about 3.0 vanadium, from about 0.4 to about 2.0 iron, from about 0.2 to about 0.3 oxygen, from about 0.005 to about 0.3 carbon, from about 0.001 to about 0.02 nitrogen, and less than about 0.5 of other elements. The method comprises cold working the α−β titanium alloy.
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Citations
25 Claims
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1. A method of forming an article from an α
- −
β
titanium alloy consisting of, in weight percentages, from 2.9 to 5.0 aluminum, from 2.0 to 3.0 vanadium, from 0.4 to 2.0 iron, from 0.2 to 0.3 oxygen, from 0.005 to 0.3 carbon, from 0.001 to 0.02 nitrogen, from 0 to 0.1 chromium, from 0 to 0.1 nickel, incidental impurities, and titanium, the method consisting of;α
−
β
working the α
−
β
titanium alloy at a temperature greater than 1600°
F. to provide the α
−
β
titanium alloy with a microstructure conducive to subsequent cold deformation; andcold working the α
−
β
titanium alloy at a temperature in the range of ambient temperature to less than 1250°
F.;wherein the article has tensile strength of at least 120 ksi and ultimate tensile strength of at least 130 ksi. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of forming an article from an α
- −
β
titanium alloy consisting of, in weight percentages, from about 2.9 to about 5.0 aluminum, from about 2.0 to about 3.0 vanadium, from about 0.4 to about 2.0 iron, from about 0.2 to about 0.3 oxygen, from about 0.005 to about 0.3 carbon, from about 0.001 to about 0.02 nitrogen, from 0 to 0.1 chromium, from 0 to 0.1 nickel, incidental impurities, and titanium, the method consisting of;α
−
β
working the α
−
β
titanium alloy at a temperature greater than 1600°
F. to provide the α
−
β
titanium alloy with a microstructure conducive to subsequent cold deformation;reducing a thickness of the α
−
β
titanium alloy at a temperature in the range of ambient temperature to less than 1250°
F. by a process comprising at least two cold rolling steps, wherein in at least one cold rolling step a thickness of the α
−
β
titanium alloy is reduced by 30% to 60%; andannealing the α
−
β
titanium alloy intermediate successive cold rolling steps and thereby reducing stresses within the α
−
β
titanium alloy;wherein the article has tensile strength of at least 120 ksi and ultimate tensile strength of at least 130 ksi. - View Dependent Claims (20, 21, 22)
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23. A method of making an armor plate from an α
- −
β
titanium alloy consisting of, in weight percentages, from 2.9 to 5.0 aluminum, from 2.0 to 3.0 vanadium, from 0.4 to 2.0 iron, from 0.2 to 0.3 oxygen, from 0.005 to 0.3 carbon, from 0.001 to 0.02 nitrogen, from 0 to 0.1 chromium, from 0 to 0.1 nickel, incidental impurities, and titanium, the method consisting of;α
−
β
working the α
−
β
titanium alloy at a temperature greater than 1600°
F. to provide the α
−
β
titanium alloy with a microstructure conducive to subsequent cold deformation; androlling the α
−
β
titanium alloy at a temperature no greater than 400°
F. below the Tβ
of the alloy;wherein the armor plate has tensile strength of at least 120 ksi and ultimate tensile strength of at least 130 ksi. - View Dependent Claims (24, 25)
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Specification