Hot stretch straightening of high strength α/β processed titanium
First Claim
1. A method for straightening a solution treated and aged titanium alloy form, comprising:
- heating a solution treated and aged titanium alloy form to a straightening temperature,wherein the straightening temperature comprises a straightening temperature in the α
+β
phase field in a straightening temperature range of 1100°
F. (611.1°
C.) below a beta transus temperature of the solution treated and aged titanium alloy form to 25°
F. (13.9°
C.) below an age hardening temperature of the solution treated and aged titanium alloy form;
applying an elongation tensile stress to the solution treated and aged titanium alloy form for a time sufficient to elongate and straighten the solution treated and aged titanium alloy form to provide a straightened solution treated and aged titanium alloy form,wherein the straightened solution treated and aged titanium alloy form deviates from straight by no greater than 0.125 inch (3.175 mm) over any 5 foot length (152.4 cm) or shorter length; and
cooling the straightened solution treated and aged titanium alloy form while simultaneously applying a cooling tensile stress to the straightened solution treated and aged titanium alloy form;
wherein the cooling tensile stress is sufficient to balance a thermal cooling stress in the straightened solution treated and aged titanium alloy form and maintain a deviation from straight of no greater than 0.125 inch (3.175 mm) over any 5 foot length (152.4 cm) or shorter length of the straightened solution treated and aged titanium alloy form.
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Accused Products
Abstract
A method for straightening a solution treated and aged (STA) titanium alloy form includes heating an STA titanium alloy form to a straightening temperature of at least 25° F. below the age hardening temperature, and applying an elongation tensile stress for a time sufficient to elongate and straighten the form. The elongation tensile stress is at least 20% of the yield stress and not equal to or greater than the yield stress at the straightening temperature. The straightened form deviates from straight by no greater than 0.125 inch over any 5 foot length or shorter length. The straightened form is cooled while simultaneously applying a cooling tensile stress that balances the thermal cooling stress in the titanium alloy form to thereby maintain a deviation from straight of no greater than 0.125 inch over any 5 foot length or shorter length.
161 Citations
16 Claims
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1. A method for straightening a solution treated and aged titanium alloy form, comprising:
-
heating a solution treated and aged titanium alloy form to a straightening temperature, wherein the straightening temperature comprises a straightening temperature in the α
+β
phase field in a straightening temperature range of 1100°
F. (611.1°
C.) below a beta transus temperature of the solution treated and aged titanium alloy form to 25°
F. (13.9°
C.) below an age hardening temperature of the solution treated and aged titanium alloy form;applying an elongation tensile stress to the solution treated and aged titanium alloy form for a time sufficient to elongate and straighten the solution treated and aged titanium alloy form to provide a straightened solution treated and aged titanium alloy form, wherein the straightened solution treated and aged titanium alloy form deviates from straight by no greater than 0.125 inch (3.175 mm) over any 5 foot length (152.4 cm) or shorter length; and cooling the straightened solution treated and aged titanium alloy form while simultaneously applying a cooling tensile stress to the straightened solution treated and aged titanium alloy form; wherein the cooling tensile stress is sufficient to balance a thermal cooling stress in the straightened solution treated and aged titanium alloy form and maintain a deviation from straight of no greater than 0.125 inch (3.175 mm) over any 5 foot length (152.4 cm) or shorter length of the straightened solution treated and aged titanium alloy form. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification