摘要:
The microstructure of titanium alloy castings is improved by a process which comprises beta-solution heat treating the cast article at or near the beta-transus temperature of the alloy, cooling the article to room temperature at a rate in excess of air cooling and aging the article at a temperature about 0.8 to 0.9 of the beta-transus.
摘要:
An improved process for producing near-alpha and alpha+beta titanium alloy axisymmetric components with high fatigue resistance which comprises the steps of:(a) providing a beta processed near-alpha or alpha+beta titanium alloy component;(b) torque deforming the component; and(c) alpha+beta recrystallization annealing the resulting torque-deformed component.
摘要:
Near-alpha and alpha+beta titanium alloy components are produced by a process which comprises the steps of forging an alloy billet to a desired shape at a temperature at or above the beta-transus temperature of the alloy to provide a forged component, heat treating the forged component at a temperature approximately equal to the beta-transus temperature of the alloy, cooling the component at a rate in excess of air cooling to room temperature, annealing the component at a temperature in the approximate range of 10 to 20% below said beta-transus temperature for about 4 to 36 hours, and air cooling the component to room temperature.
摘要:
A method for improving the microstructure of blended elemental titanium alloy compacted articles which comprises the steps of hydrogenating the article at a temperature 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. and applying a vacuum to dehydrogenate the article, and cooling the thus-dehydrogenated article to room temperature at a controlled rate.
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 revealing the microstructure of metal alloys which comprises the steps of polishing the sample, chemically etching the polished metal surface, thermally etching the chemically etched surface and quenching the thermally etched sample. This method allows observation of deformed and recrystallized grains on the same polished surface and provides the opportunity to correlate recrystallized grains to their nucleation sites.
摘要:
A method for improving the microstructure of an article made by powder metallurgy of blended elemental titanium powder which comprises beta-solution heat treating the article at a temperature approximately equal to the beta-transus of the equivalent alloy, rapidly cooling the article, annealing the article at a temperature about 10 to 20% below the beta-transus and air cooling to room temperature. The resulting article has a fine alpha plate structure in a matrix of discontinuous beta phase.
摘要:
Forming metal and metalloid carbides by mechanically inducing a reduction reaction between a metal chloride (or a metalloid chloride) and a metal carbide. The reduction reactions are induced mechanically by milling the reactants. Alloy carbides may also be produced by mechanically inducing the co-reduction of metal chlorides or metalloid chlorides and a metal carbide according to the equation: M1chloride+M2chloride+M3carbide→M1M2carbide, where M1 is a metal or metalloid, M2 is a metal or metalloid and M3 is a suitable carbide reducing agent.
摘要:
A metal matrix composite material made of a fiber reinforcement having a coating of gadolinium and gadolinium boride, preferably as discrete layers, each having a thickness of 1 to 6 microns. This composite is made by coating reinforcing fibers with gadolinium using a deposition technique, further coating the fibers with gadolinium boride by a deposition technique and then consolidating the coated fibers into a metal matrix to form the metal matrix composite.