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US 9,039,849 B2Granted
Preparation method of nanocrystalline titanium alloy at low strain
AssigneePostech Academy-Industry Foundation
InventorsChan Hee Park, Chong Soo Lee, Sung Hyuk Park, Young Soo Chun
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Abstract
Provided is a method of preparing a nanocrystalline titanium alloy at low strain to have better strength. The present invention is characterized in that an initial microstructure is induced as martensites having a fine layered structure, and then a nanocrystalline titanium alloy is prepared at low strain by optimizing process variables through observation of the effects of strain, strain rate, and deformation temperature on the changes in the microstructure.
Claims3
A method of preparing a nanocrystalline titanium alloy, the method comprising;
- segmenting a martensite structure haying a layered structure into a fine equiaxed structure having a size range of 200 nm to 400 nm by rolling under conditions that a deformation temperature ranges from 575° C. to 625° C., a strain rate ranges from 0.07 to 0.13 s−1, and a strain ranges from 0.9 to 1.8,
- wherein a dynamic spheroidization is generated when the layered structure of the martensite structure is entirely segmented into the fine equiaxed structure.
Dependencies are inferred from the claim text.