Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Reexamination Certificate
2006-03-07
2006-03-07
Jenkins, Daniel (Department: 1742)
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
Reexamination Certificate
active
07008491
ABSTRACT:
A method for fabricating an article of a titanium-base alloy, such as an alpha-beta titanium gas turbine fan or compressor disk, uses a starting ingot having a thickness of at least about 20 inches, and which is made of a titanium-base alloy having a temperature-composition phase diagram with a beta-phase field and an alpha-beta phase field. The method includes first forging the starting ingot in the beta-phase field to form an in-process billet, thereafter second forging the in-process billet in the alpha-beta phase field, thereafter heating the in-process billet into the beta-phase field to recrystallize the in-process billet, and thereafter third forging the in-process billet. The step of third forging includes forging the in-process billet from a first forging thickness of not less than about 15 inches to a second forging thickness of not more than about 13 inches, at a third-forging temperature of from about 1550° F. to about 1725° F.
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General Electric Company
Jenkins Daniel
McNees Wallace & Nurick LLC
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