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Processing routes for titanium and titanium alloys

  • US 10,435,775 B2
  • Filed: 09/17/2013
  • Issued: 10/08/2019
  • Est. Priority Date: 09/15/2010
  • Status: Active Grant
First Claim
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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:

  • 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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