Methods for processing titanium alloys
First Claim
1. A method of refining a grain size of 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
multi-axis forging the workpiece, wherein the multi-axis forging comprisespress forging the workpiece at a workpiece forging temperature in a workpiece forging temperature range in the direction of a first orthogonal axis of the workpiece with a strain rate sufficient to adiabatically heat an internal region of the workpiece,press forging the workpiece at a workpiece forging temperature in the workpiece forging temperature range in the direction of a second orthogonal axis of the workpiece with a strain rate that is sufficient to adiabatically heat the internal region of the workpiece,press forging the workpiece at a workpiece forging temperature in the workpiece forging temperature range in the direction of a third orthogonal axis of the workpiece with a strain rate that is sufficient to adiabatically heat the internal region of the workpiece, andrepeating at least one of the press forgings until a total true strain of at least 1.0 is achieved in the workpiece.
2 Assignments
0 Petitions
Accused Products
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.
236 Citations
46 Claims
-
1. A method of refining a grain size of 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 multi-axis forging the workpiece, wherein the multi-axis forging comprises press forging the workpiece at a workpiece forging temperature in a workpiece forging temperature range in the direction of a first orthogonal axis of the workpiece with a strain rate sufficient to adiabatically heat an internal region of the workpiece, press forging the workpiece at a workpiece forging temperature in the workpiece forging temperature range in the direction of a second orthogonal axis of the workpiece with a strain rate that is sufficient to adiabatically heat the internal region of the workpiece, press forging the workpiece at a workpiece forging temperature in the workpiece forging temperature range in the direction of a third orthogonal axis of the workpiece with a strain rate that is sufficient to adiabatically heat the internal region of the workpiece, and repeating at least one of the press forgings until a total true strain of at least 1.0 is achieved 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. A method of refining a grain size of 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 multi-axis forging the workpiece, wherein the multi-axis forging comprises press forging the workpiece at a workpiece forging temperature in a workpiece forging temperature range in the direction of a first orthogonal A-axis of the workpiece to a major reduction spacer height with a strain rate sufficient to adiabatically heat an internal region of the workpiece, press forging the workpiece at the workpiece forging temperature in the direction of a second orthogonal B-axis of the workpiece to a first blocking reduction spacer height, press forging the workpiece at the workpiece forging temperature in the direction of a third orthogonal C-axis of the workpiece to a second blocking reduction spacer height, press forging the workpiece at the workpiece forging temperature in the direction of the second orthogonal B-axis of the workpiece to the major reduction spacer height with a strain rate sufficient to adiabatically heat an internal region of the workpiece, press forging the workpiece at the workpiece forging temperature in the direction of the third orthogonal C-axis of the workpiece to the first blocking reduction spacer height, press forging the workpiece at the workpiece forging temperature in the direction of the first orthogonal A-axis of the workpiece to the second blocking reduction spacer height, press forging the workpiece at the workpiece forging temperature in the direction of the third orthogonal C-axis of the workpiece to the major reduction spacer height with a strain rate sufficient to adiabatically heat an internal region of the workpiece, press forging the workpiece at the workpiece forging temperature in the direction of the first orthogonal A-axis of the workpiece to the first blocking reduction spacer height, press forging the workpiece at the workpiece forging temperature in the direction of the second orthogonal B-axis of the workpiece to the second blocking reduction spacer height, and repeating at least one of the preceding press forgings until a total true strain of at least 1.0 is achieved in the workpiece. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
-
Specification