METHOD OF HIGH-TEMPERATURE THERMOMECHANICAL PROCESSING OF SEMIS FROM (α+β) TITANIUM ALLOYS Russian patent published in 2016 - IPC C22F1/18 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, in particular, to high-temperature thermomechanical processing of semis from titanium alloys, and can be used in aerospace engineering. Method of high-temperature thermomechanical processing of semis from (α+β)-titanium alloys comprises heating, multistage deformation, at which deformation is first performed at temperature of 10-350 °C above temperature of polymorphic conversion with degree of 30-90 % and deformation rate of 1-300 mm/s. Then, deformation is performed at temperature of 20-50 °C below temperature of polymorphic conversion with degree of 10-30 % a deformation rate of 3-60 mm/s, then deformation is performed at temperature of 20-50 °C below temperature of polymorphic conversion with degree of 30-70 % and deformation rate of 5-60 mm/s during cooling semis for 20-300 °C. Further deformation is performed with deformation degree of 30-95 % under isothermal conditions at temperature at interval of 100 °C above temperature of polymorphic conversion - of 300 °C below temperature polymorphic conversion with deformation rate of 0.01-4.0 mm/s, then cooling in air is performed.

EFFECT: obtained alloy structure is characterized by extra-fine grain and homogeneous morphology of structural components; alloy has high endurance limit and low-cycle fatigue.

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