Processing of alpha/beta titanium alloys
First Claim
Patent Images
1. A process comprising:
- cold working an α
+β
titanium alloy workpiece at a temperature in the range of ambient temperature to 500°
F.; and
direct aging the cold-worked α
+β
titanium alloy workpiece at a temperature in the range of 700°
F. to 1200°
F. without any quenching intermediate cold working the α
+β
titanium alloy workpiece and direct aging the cold-worked α
+β
titanium alloy workpiece;
the α
+β
titanium alloy comprising, in weight percentages, from 2.90 to 5.00 aluminum, from 2.00 to 3.00 vanadium, from 0.40 to 2.00 iron, from 0.10 to 0.30 oxygen, titanium, and incidental impurities, wherein the cold working and direct aging forms an α
+β
titanium alloy article having an ultimate tensile strength (UTS) and an elongation that satisfy the equation;
5×
(Elongation in %)+(UTS in ksi)≥
230.
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Abstract
Processes for forming an article from an α+β titanium alloy are disclosed. The α+β titanium alloy includes, in weight percentages, from 2.90 to 5.00 aluminum, from 2.00 to 3.00 vanadium, from 0.40 to 2.00 iron, and from 0.10 to 0.30 oxygen. The α+β titanium alloy is cold worked at a temperature in the range of ambient temperature to 500° F., and then aged at a temperature in the range of 700° F. to 1200° F.
272 Citations
21 Claims
-
1. A process comprising:
-
cold working an α
+β
titanium alloy workpiece at a temperature in the range of ambient temperature to 500°
F.; anddirect aging the cold-worked α
+β
titanium alloy workpiece at a temperature in the range of 700°
F. to 1200°
F. without any quenching intermediate cold working the α
+β
titanium alloy workpiece and direct aging the cold-worked α
+β
titanium alloy workpiece;the α
+β
titanium alloy comprising, in weight percentages, from 2.90 to 5.00 aluminum, from 2.00 to 3.00 vanadium, from 0.40 to 2.00 iron, from 0.10 to 0.30 oxygen, titanium, and incidental impurities, wherein the cold working and direct aging forms an α
+β
titanium alloy article having an ultimate tensile strength (UTS) and an elongation that satisfy the equation;
5×
(Elongation in %)+(UTS in ksi)≥
230. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A process comprising:
-
hot working an α
+β
titanium alloy workpiece at a temperature in the range of 1500°
F. to 1775°
F.;annealing the α
+β
titanium alloy at a temperature in the range of 1200°
F. to 1500°
F.;cold working the α
+β
titanium alloy workpiece at ambient temperature to a 20% to 60% reduction in area; anddirect aging the cold worked α
+β
titanium alloy workpiece at a temperature in the range of 800°
F. to 1100°
F. without any quenching intermediate cold working the α
+β
titanium alloy workpiece and direct aging the cold worked α
+β
titanium alloy workpiece;the α
+β
titanium alloy comprising, in weight percentages, from 2.90 to 5.00 aluminum, from 2.00 to 3.00 vanadium, from 0.40 to 2.00 iron, from 0.10 to 0.30 oxygen, titanium, and incidental impurities, wherein the cold working and direct aging forms an α
+β
titanium alloy article having an ultimate tensile strength (UTS) and an elongation that satisfy the equation;
5×
(Elongation in %)+(UTS in ksi)≥
230. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
-
Specification