Methods for processing titanium alloys
First Claim
1. A method of processing a workpiece comprising a titanium alloy, the method comprising:
- beta annealing the workpiece;
cooling the beta annealed workpiece to a temperature below a beta transus temperature of the titanium alloy; and
forging the workpiece along a plurality of axes, wherein the forging the workpiece along a plurality of axes comprisespress forging the workpiece in a forging temperature range along a first axis of the workpiece with a strain rate that adiabatically heats an internal region of the workpiece,press forging the workpiece in the forging temperature range along a second axis of the workpiece with a strain rate that adiabatically heats the internal region of the workpiece,press forging the workpiece in the forging temperature range along a third axis of the workpiece with a strain rate that adiabatically heats the internal region of the workpiece,wherein the first axis, the second axis, and the third axis are not the same or parallel, andrepeating at least one of the press forgings,wherein the forging the workpiece along a plurality of axes results in a total true strain of at least 1.0 in the workpiece.
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Abstract
Methods of refining the grain size of a titanium alloy workpiece include beta annealing the workpiece, cooling the beta annealed workpiece to a temperature below the beta transus temperature of the titanium alloy, and high strain rate multi-axis forging the workpiece. High strain rate multi-axis forging is employed until a total strain of at least 1 is achieved in the titanium alloy workpiece, or until a total strain of at least 1 and up to 3.5 is achieved in the titanium alloy workpiece. The titanium alloy of the workpiece may comprise at least one of grain pinning alloying additions and beta stabilizing content effective to decrease alpha phase precipitation and growth kinetics.
257 Citations
34 Claims
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1. A method of processing a workpiece comprising a titanium alloy, the method comprising:
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beta annealing the workpiece; cooling the beta annealed workpiece to a temperature below a beta transus temperature of the titanium alloy; and forging the workpiece along a plurality of axes, wherein the forging the workpiece along a plurality of axes comprises press forging the workpiece in a forging temperature range along a first axis of the workpiece with a strain rate that adiabatically heats an internal region of the workpiece, press forging the workpiece in the forging temperature range along a second axis of the workpiece with a strain rate that adiabatically heats the internal region of the workpiece, press forging the workpiece in the forging temperature range along a third axis of the workpiece with a strain rate that adiabatically heats the internal region of the workpiece, wherein the first axis, the second axis, and the third axis are not the same or parallel, and repeating at least one of the press forgings, wherein the forging the workpiece along a plurality of axes results in a total true strain of at least 1.0 in the workpiece. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification