首页>
外国专利>
Method for processing-microstructure-property optimization of . alpha.-. beta. beta titanium alloys to obtain simultaneous improvements in mechanical properties and fracture resistance
Method for processing-microstructure-property optimization of . alpha.-. beta. beta titanium alloys to obtain simultaneous improvements in mechanical properties and fracture resistance
展开▼
机译：铝的显微组织性能优化方法。 α。-。 Beta。 β钛合金可同时提高机械性能和抗断裂性能
展开▼
页面导航
摘要
著录项
相似文献
摘要
The invention is a process for simultaneously improving at least two mechanical properties of mill-processed (&agr;+&bgr;) titanium alloy, which may or may not contain silicon, which includes steps of heat treating the mill-processed titanium alloy such that the (&agr;+. beta.) microstructure of said alloy is transformed into an (&agr;+. alpha.. sub. 2 +&bgr;) 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 (&agr;+ &agr;.sub.2 +&bgr;) microstructure contains equiaxed alpha phase strengthened with &agr;.sub.2 precipitates coexisting with lamellar alpha- beta phase, where the &agr; .sub.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 (&agr;+&agr;.sub. 2 +&bgr;) microstructure.
展开▼
