C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 1/34 (2006.01) C21D 8/00 (2006.01) C22C 14/00 (2006.01) C22F 1/16 (2006.01) C22F 1/18 (2006.01)
Patent
CA 2192412
The invention is a process for simultaneously improving at least two mechanical properties of mill-processed (.alpha. + .beta.) titanium alloy, which may or may not contain silicon, which includes steps of heat treating the mill-processed titanium alloy such that the (.alpha. + .beta.) microstructure of said alloy is transformed into an (.alpha. + .alpha.2 + .beta.) microstructure, preferably containing no silicides. The heat treating steps involve subjecting the mill-processed titanium alloy to a sequence of thermomechanical process steps, and the mechanical properties which are simultaneously improved include (a) tensile strength at room, cryogenic, and elevated temperatures; (b) fracture toughness; (c) creep resistance; (d) elastic stiffness; (e) thermal stability; (f) hydrogen embrittlement resistance; (g) fatigue; and (h) cryogenic temperature embrittlement resistance. As a consequence of the process, the (.alpha. + .alpha.2 + .beta.) microstructure contains equiaxed alpha phase strengthened with .alpha.2 precipitates coexisting with lamellar alpha-beta phase, where the .alpha.2 precipitates are confined totally to the equiaxed primary alpha phase. The invention also encompasses a composition of matter produced by the inventive process, especially one comprising a titanium alloy having an (.alpha. + .alpha.2 + .beta.) microstructure.
Boeing North American Inc.
Ridout & Maybee Llp
Rockwell International Corporation
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