RX2 titanium is the improved product alpha-beta titanium alloy unique microstructure produced by a heat treat process recently invented by El-Soudani for simultaneously and substantially enhancing both mechanical properties and fracture resistance of mill-processed (alpha+beta) titanium alloys. These alloys may or may not contain silicon. This innovative method of heat treating the mill-processed titanium alloys has demonstrated that the (alpha+beta) microstructure of such alloys is transformed into an (alpha+alpha2+beta) microstructure, preferably containing no silicides. Such improvements have been demonstrated on two commercial titanium alloys, namely Ti 6242S and Ti 62222, both in sheet and extruded product forms. The RX2 alloy optimization steps involve subjecting the mill-processed titanium alloy to a sequence of thermomechanical and special solution and age processing steps, whereby the mechanical properties which are simultaneously improved by the RX2 method have been shown to 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 patented process, the (alpha+alpha2+beta) microstructure contains equiaxed alpha phase strengthened with alpha2 precipitates coexisting with lamellar alpha-beta phase, where the alpha2 precipitates are confined totally to the equiaxed primary alpha phase. El-Soudani's invention also encompasses a composition of matter produced by the innovative process, especially one comprising a titanium alloy having an (alpha+alpha2+beta) microstructure.


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    Title :

    RX2 titanium: a new heat treat method for simultaneously improved mechanical properties and fracture resistance of alpha-beta titanium alloys


    Additional title:

    RX2-Titan: ein neues Wärmebehandlungsverfahren für gleichzeitige Verbesserung der mechanischen Eigenschaften und der Bruchfestigkeit von Alpha-Beta-Titanlegierungen


    Contributors:


    Publication date :

    2002


    Size :

    6 Seiten, 9 Bilder, 4 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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