Processing routes for titanium and titanium alloys
First Claim
1. A method of refining grain size in a workpiece comprising a metallic material selected from titanium and a titanium alloy, the method comprising:
- heating the workpiece to a beta soaking temperature;
holding the workpiece at the beta soaking temperature for a beta soaking time sufficient to form a 100% beta phase microstructure in the workpiece;
cooling the workpiece to room temperature;
heating the workpiece to a workpiece forging temperature in a workpiece forging temperature range within an alpha+beta phase field of the metallic material, wherein the workpiece comprises a starting cross-sectional dimension;
upset forging the workpiece within the workpiece forging temperature range; and
multiple pass draw forging the workpiece within the workpiece forging temperature range;
wherein multiple pass draw forging comprises incrementally rotating an entirety of the workpiece in a rotational direction followed by draw forging the workpiece after each incremental rotation;
wherein incrementally rotating and draw forging is repeated until a true strain of at least 3.5 is achieved in the workpiece; and
wherein the workpiece is not heated during the multiple pass draw forging.
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Accused Products
Abstract
Methods of refining the grain size of titanium and titanium alloys include multiple upset and draw forging. Titanium and titanium alloy workpieces are heated to a workpiece forging temperature within a workpiece forging temperature range in the alpha+beta phase field. The workpiece may comprise a starting cross-sectional dimension. The workpiece is upset forged in the workpiece forging temperature range. After upsetting, the workpiece is multiple pass draw forged in the workpiece forging temperature range. Multiple pass draw forging may comprise incrementally rotating the workpiece in a rotational direction followed by draw forging the workpiece after each incremental rotation. Incrementally rotating and draw forging the workpiece is repeated until the workpiece comprises substantially the same starting cross-sectional dimension.
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Citations
26 Claims
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1. A method of refining grain size in a workpiece comprising a metallic material selected from titanium and a titanium alloy, the method comprising:
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heating the workpiece to a beta soaking temperature; holding the workpiece at the beta soaking temperature for a beta soaking time sufficient to form a 100% beta phase microstructure in the workpiece; cooling the workpiece to room temperature; heating the workpiece to a workpiece forging temperature in a workpiece forging temperature range within an alpha+beta phase field of the metallic material, wherein the workpiece comprises a starting cross-sectional dimension; upset forging the workpiece within the workpiece forging temperature range; and multiple pass draw forging the workpiece within the workpiece forging temperature range; wherein multiple pass draw forging comprises incrementally rotating an entirety of the workpiece in a rotational direction followed by draw forging the workpiece after each incremental rotation; wherein incrementally rotating and draw forging is repeated until a true strain of at least 3.5 is achieved in the workpiece; and wherein the workpiece is not heated during the multiple pass draw forging. - 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 refining grain size in a workpiece comprising a metallic material selected from titanium and a titanium alloy, the method comprising:
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heating the workpiece to a beta soaking temperature range from the beta transus temperature of the metallic material to 300°
F. (111°
C.) above the beta transus temperature of the metallic material;holding the workpiece within the beta soaking temperature range for time sufficient to form a 100% beta phase microstructure in the workpiece; cooling the workpiece; heating the workpiece to a workpiece forging temperature range within an alpha+beta phase field of the metallic material, wherein the workpiece comprises a starting cross-sectional dimension; upset forging the workpiece within the workpiece forging temperature range; and multiple pass draw forging the workpiece within the workpiece forging temperature range; wherein multiple pass draw forging comprises incrementally rotating an entirety of the workpiece in a rotational direction followed by draw forging the workpiece after each incremental rotation; wherein incrementally rotating and draw forging is repeated until a true strain of at least 3.5 is achieved in the workpiece; and wherein the workpiece is not heated during the multiple pass draw forging. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification