Method for making titanium alloy products
AssigneeNKK Corporation
InventorsAtsushi Ogawa, Hiroshi Iizumi, Masakazu Niikura, Chiaki Ouchi
Life of this patent
Estimating the term…
Abstract
A method for making titanium alloy products comprises the steps of: superplastic-forming .alpha.+.beta.-titanium alloy at a predetermined temperature, said .alpha.+.beta.-titanium alloy consisting essentially of 3.45 to 5 wt. % Al, 2.1 to 5 wt. % V, 0.85 to 2.85 wt. % Mo, 0.85 to 3.15 wt. % Fe, 0.01 to 0.25 wt. % 0 and the balance being titanium; cooling the superplastically formed titanium alloy at a cooling rate of 0.05 to 5.degree. C./sec; and aging the cooled titanium alloy at a temperature of 400.degree. to 600.degree. C. The superplastically formed titanium alloy can be diffusion-bonded, thereafter the diffusion-bonded titanium alloy can be cooled and aged.
Claims34
A method for making a titanium alloy product comprising the steps of:
- superplastic forming .alpha.+.beta.-titanium alloy at a temperature of at most .beta.-transus, said .alpha.+.beta.-titanium alloy consisting essentially of 3.45 to 5 wt. % Al, 2.1 to 5 wt. % V, 0.85 to 2.85 wt. % Mo, 0.85 to 3.15 wt. % Fe, 0.01 to 0.25 wt. % 0 and the balance being titanium;
- cooling the superplastically formed titanium alloy at a cooling rate of 0.05.degree. to 5.degree. C./sec;
- and
- aging the cooled titanium alloy at a temperature of 400.degree. to 600.degree. C.
A method for making a titanium alloy formed product comprising the steps of:
- superplastic-forming .alpha.+.beta.-titanium alloy at a temperature below .beta.-transus minus 5.degree. C., said .alpha.+.beta.-titanium alloy consisting essentially of 3.45 to 5 wt. % Al, 2.1 to 5 wt. % V, 0.85 to 2.85 wt. % Mo, 0.85 to 3.15 wt. % Fe, 0.01 to 0.25 wt. % 0 and the balance being titanium;
- heating the superplastically formed titanium alloy to a temperature ranging from the superplastic-forming temperature plus 5.degree. C. to less than .beta.-transus;
- cooling the heated superplastically formed titanium alloy at a cooling rate of 0.05.degree. to 5.degree. C./sec;
- and
- aging the cooled superplastically formed titanium alloy at a temperature of 400.degree. to 600.degree. C.
A method for making a titanium alloy product comprising the steps of:
- superplastic-forming at least two components of .alpha.+.beta.-titanium alloy at a temperature below .beta.-transus minus 5.degree. C., said .alpha.+.beta.-titanium alloy consisting essentially of 3.45 to 5 wt. % Al, 2.1 to 5 wt % V, 0.85 to 2.85 wt. % Mo, 0.85 to 3.15 wt. % Fe, 0.01 to 0.25 wt. % 0 and the balance being titanium;
- heating each superplastically formed titanium alloy component to a temperature ranging from the superplastic-forming temperature plus 5.degree. C. to less than .beta.-transus;
- diffusion-bonding the heated titanium alloy components to each other;
- cooling the diffusion-bonded titanium alloy components at a cooling rate of 0.05.degree. to 5.degree. C./sec;
- and
- aging the cooled titanium alloy components at a temperature of 400.degree. to 600.degree. C.
Dependencies are inferred from the claim text.