Methods for heat treating and manufacturing a thermomechanical part made of a titanium alloy, and thermomechanical part resulting from these methods

Abstract

A method of heat treating a thermomechanical part made of a TA6Zr4DE titanium alloy. A solution-annealing is performed at a temperature lying in the range beta transus −20° C. and beta transus −15° C. for a duration lying in the range four hours to eight hours. The method is applicable to fabricating high pressure compressor disks.

1 - 9 . (canceled) 
   
   
       10 . A method of heat treatment for a thermomechanical part made out of a TA6Zr4DE titanium alloy, the method comprising:
 a solution-annealing at a temperature lying in the range beta transus −20° C. and beta transus −15° C. for a duration lying in the range four hours to eight hours.   
   
   
       11 . A heat treatment according to  claim 10 , further comprising:
 after the solution-annealing, quenching the part at a cooling rate greater than 200° C./min.   
   
   
       12 . A heat treatment method according to  claim 11 ,
 wherein the cooling rate, during the quenching the part, lies in the range 300° C./min to 450° C./min.   
   
   
       13 . A heat treatment method according to  claim 12 , further comprising:
 after the quenching, a tempering at a temperature of about 595° C. for a duration of about eight hours; and then   cooling in air.   
   
   
       14 . A method of fabricating a thermomechanical part made of a titanium alloy, the fabrication being by stamping in the beta domain, and the method comprising:
 a heat treatment method according to  claim 10 .   
   
   
       15 . A thermomechanical part made of a titanium alloy in which the fabrication method includes a heat treatment method according to  claim 10 . 
   
   
       16 . A thermomechanical part according to  claim 15 , forming a rotary part of a turbomachine. 
   
   
       17 . A thermomechanical part according to  claim 15 , forming a high pressure compressor disk. 
   
   
       18 . A turbomachine including a thermomechanical part according to  claim 15 .