Method for refining microstructures of blended elemental powder metallurgy titanium articles
AssigneeThe United States of America as represented by the Secretary of the Air Force
InventorsDaniel Eylon, Francis H. Froes
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Abstract
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.
Claims7
A method for improving the microstructure of an article made by powder metallurgy of blended elemental powder equivalent in bulk chemistry to a titanium alloy which comprises, in combination, the steps of:
- a. beta-solution heat treating said article at a temperature approximately equal to the beta-transus temperature of the equivalent alloy;
- b. cooling said article at a rate in excess of air cooling to room temperature;
- c. annealing said article at a temperature in the approximate range of 10 to 20% below said beta-transus temperature for about 4 to 36 hours;
- and,
- d. air cooling said article to room temperature.
An article of manufacture comprising a component made by powder metallurgy of blended elemental powder equivalent in bulk chemistry to a titanium alloy, said article having a fine alpha plate microstructure with a discontinuous beta phase.
Dependencies are inferred from the claim text.