METHOD FOR MANUFACTURING OF SEMI-FINISHED SHEET PRODUCT FROM TITANIUM ALLOY Russian patent published in 2008 - IPC C22F1/18 

Abstract RU 2320771 C1

FIELD: manufacture of semi-finished sheet product from low-plasticity two-phase titanium alloy of submicrocrystalline structure suitable for low-temperature superplastic deformation.

SUBSTANCE: method involves rolling blank with prepared structure at temperature below polymorphic transformation temperature under isothermal or quasi-isothermal conditions provided by heating of rolls. Grain size stabilization and isotropic properties are reached thanks to the fact that rolling process is provided in low-temperature superplastic deformation mode: at first passage deformation is carried out at the extent of ε≥εmin, where εmin is minimum extent at which structural state of alloy is formed in selected temperature-rolling speed mode. Such structural state is necessary for enabling of cooperated grain boundary sliding during deformation. After each subsequent passage of rolling step, blank is cooled for fixing of structural state provided upon deformation. During heating of blank in furnace for subsequent passage of rolling step, heating time is limited in order to avoid disturbance of structural state of alloy produced at previous rolling passage.

EFFECT: increased efficiency and improved quality of semi-finished sheet product fit for further low-temperature superplastic deformation.

12 cl, 9 dwg, 1 tbl, 7 ex

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RU 2 320 771 C1

Authors

Astanin Vladimir Vasil'Evich

Kajbyshev Oskar Akramovich

Dates

2008-03-27Published

2006-07-06Filed