Titanium alloy having enhanced notch toughness and method of producing same
US6190473A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 12, 1999 |
| Grant date | Feb 20, 2001 |
| Priority date | — |
| Expiry date | Aug 12, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22F1/183
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for treating an alpha-beta titanium alloy to improve cryogenic notch tensile ratio comprises heating the alloy to near or above its beta transus temperature for a sufficient time to dissolve substantially all alpha grains and thus transform the alloy to the beta form, rapidly cooling the alloy from this temperature to induce a martensitic transformation and produce a fine platelet microstructure, isothermally forging the alloy about 50 to 80 percent at about 300.degree. C. below the beta transus temperature to attain a fine equiaxed microstructure such that the largest microstructural unit is about 2-5 .mu.m, and then aging the alloy at a temperature about 25.degree. C. to 75.degree. C. below the beta transus to grow the refined equiaxed microstructure such that the largest microstructural unit is about 5-10 .mu.m. A titanium alpha-beta alloy having enhanced notch toughness comprises titanium, aluminum, and vanadium and is characterized by a microstructure having equiaxed alpha grains whose volume fraction is about 75 to 85 percent, a maximum grain size of the microstructure not exceeding about 10 .mu.m, and with the volume fraction of primary alpha grains not exceeding a…
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