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Thermomechanical processing of alpha-beta titanium alloys

  • US 10,370,751 B2
  • Filed: 07/26/2017
  • Issued: 08/06/2019
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. A method of refining alpha-phase grain size in an alpha-beta titanium alloy workpiece, the method comprising:

  • forging an alpha-beta titanium alloy at a first forging temperature within a first forging temperature range,wherein forging the alpha-beta titanium alloy at the first forging temperature comprises at least one pass of both upset forging and draw forging, andwherein the first forging temperature range spans 300°

    F. below the beta transus up to a temperature 30°

    F. below a beta transus temperature of the alpha-beta titanium alloy;

    slow cooling the alpha-beta titanium alloy from the first forging temperature, wherein the step of slow cooling comprises cooling the alpha-beta titanium alloy at a cooling rate no greater than 5°

    F. per minute;

    forging the alpha-beta titanium alloy at a second forging temperature within a second forging temperature range,wherein forging the alpha-beta titanium alloy at the second forging temperature comprises at least one pass of both upset forging and draw forging,wherein the second forging temperature range comprises a temperature range spanning 600°

    F. to 350°

    F. below the beta transus, andwherein the second forging temperature is lower than the first forging temperature; and

    forging the alpha-beta titanium alloy at a third forging temperature within a third forging temperature range,wherein forging the alpha-beta titanium alloy at the third forging temperature comprises radial forging,wherein the third forging temperature range is 1000°

    F. to 1400°

    F., andwherein the third forging temperature is lower than the second forging temperature.

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