摘要:
The microstructure of forged titanium alloy components is improved by beta-transus heat treating the components, hydrogenating the components at an elevated temperature, cooling the thus-hydrogenated components to room temperature, dehydrogenating the components at an elevated temperature and cooling the dehydrogenated components to room temperature.
摘要:
The microstructure of titanium alloy powder compacts is refined and improved by a method which comprises beta solution heat treating the compact, hydrogenating and then dehydrogenating the compact.
摘要:
The microstructure of cast titanium alloy articles is improved by a method which comprises beta solution heat treating the article, followed by hydrogenating and then dehydrogenating the article.
摘要:
A method for producing an integral titanium alloy article having at least o regions, each region having a distinct microstructure, which comprises the steps of(a) providing a suitable mold for the article;(b) introducing a first titanium alloy into a first portion of the mold;(c) introducing a second titanium alloy in powder form into a second portion of the mold; and(d) hot compacting the first and second alloys in the mold to produce a substantially fully dense article.The second alloy may be the hydrided version of the first alloy, or may have a different overall composition from the first alloy, or may be hydrided and have a different overall composition from the first alloy.
摘要:
A method for improving the microstructure of cast titanium alloy articles which comprises the steps of hydrogenating the cast article at a temperature near or above the titanium-hydrogen eutectoid of 815.degree. C. (of about 780.degree. to 1020.degree. C.) to a hydrogen level of about 0.50 to 1.50 weight percent, cooling the thus-hydrogenated article to room temperature at a controlled rate, heating the thus-cooled, hydrogenated article to a temperature of about 650.degree. to 750.degree. C., applying a vacuum to dehydrogenate the article, and cooling the thus-dehydrogenated article at a controlled rate.
摘要:
A method for fabricating an improved titanium alloy composite consisting of at least one high strength/high stiffness filament or fiber embedded in an alpha-beta titanium alloy matrix which comprises the steps of providing a rapidly-solidified foil made of a lean metastable beta titanium alloy, fabricating a preform consisting of alternating layers of the rapidly-solidified foil and the filamentary material, and applying heat and pressure to consolidate the preform, wherein consolidation is carried out at a temperature below the beta-transus temperature of the alloy.
摘要:
A method for fabricating an improved titanium alloy composite consisting of at least one high strength/high stiffness filament or fiber embedded in an alpha-beta titanium alloy matrix which comprises the steps of providing a rapidly-solidified foil made of an alpha-beta titanium alloy, fabricating a preform consisting of alternating layers of the rapidly-solidified foil and the filamentary material, and applying heat and pressure to consolidate the preform, wherein consolidation is carried out at a temperature below the beta-transus temperature of the alloy.
摘要:
A method of producing titanium alloy articles having a desired microstructure which comprises the steps of:(a) providing a prealloyed titanium alloy powder;(b) filling a suitable die or mold with the powder;(c) hot isostatic press (HIP) consolidating the powder in the filled mold at a pressure of 30 Ksi or greater and at a temperature of about 60 to 80 percent of the beta transus temperature of the alloy, in degrees C.In another embodiment of the invention, the prealloyed titanium aluminide alloy powder is hydrogenated to about 0.1 to 1.0 wt. % prior to die filling and consolidation. The compacted article is vacuum annealed to remove hydrogen from the article after removal of the die material.
摘要:
Processes for producing titanium alloy SPF/DB components, particularly structural panels, are provided.In one embodiment, the process comprises providing rapidly solidified titanium alloy sheetstock, providing a plurality of rapidly solidified titanium alloy ribbons or strips, forming the ribbons into waveform structures, assembling a plurality of these waveform structures to produce a honeycomb core, positioning this core between face sheets, and bonding the core to the face sheets.In another embodiment the process comprises providing rapidly solidified titanium alloy sheetstock, superplastically forming at least one piece of sheetstock into a shaped piece having spaced apart, parallel bonding regions, positioning this shaped piece between two face sheets, and bonding the shaped piece to each face sheet.In yet another embodiment of the invention, the process comprises providing rapidly solidified titanium alloy sheetstock, applying a diffusion bond-inhibiting material in a desired pattern to at least one piece of sheetstock, assembling the sheetstock having the bond-inhibiting pattern thereon with at least one further piece of sheetstock, diffusion bonding this assembly, and superplastically forming the bonded assembly by introducing an inert gas into the region defined by the bond-inhibiting material.
摘要:
A method for producing an integral titanium alloy article having at least two regions, each region having a distinct microstructure is provided. The method comprises heat treating one or more selected region(s) of the article at a temperature greater than the beta-transus temperature of the region(s), while simultaneously heat treating the remaining region(s) of the article at a temperature below the beta-transus temperature of the remaining region(s).