| US 7,481,898 B2 | ||
| Method for fabricating a thick Ti64 alloy article to have a higher surface yield and tensile strengths and a lower centerline yield and tensile strengths | ||
| Peter Wayte, Maineville, Ohio (US); and Ming Cheng Li, Cincinnati, Ohio (US) | ||
| Assigned to General Electric Company, Schenectady, N.Y. (US) | ||
| Filed on Oct. 24, 2003, as Appl. No. 10/692,985. | ||
| Prior Publication US 2005/0087272 A1, Apr. 28, 2005 | ||
| Int. Cl. C22F 1/18 (2006.01) | ||
| U.S. Cl. 148—671 | 20 Claims |
| 1. A method for fabricating a forged titanium-alloy article, comprising the steps of
providing a workpiece made of an alpha-beta titanium alloy having a nominal composition in weight percent of 6 percent aluminum,
4 percent vanadium, 0.2 percent oxygen, balance titanium and impurities, wherein the titanium alloy has a beta-transus temperature;
thereafter
forging the workpiece to make a forged gas turbine engine component, wherein the forged gas turbine engine component has a
thick portion thereof with a section thickness greater than 2¼ inches; thereafter
rough machining the forged gas turbine engine component; thereafter
heat treating the machined forged gas turbine engine component by the steps consisting essentially of
solution heat treating the machined forged gas turbine engine component at a temperature of from about 50° F. to about 75°
F. below the beta-transus temperature, thereafter
water quenching the gas turbine engine component to room temperature, and thereafter
aging the gas turbine engine component at a temperature of from about 900° F. to about 1000° F.; and thereafter
final machining the forged gas turbine engine component.
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