METHOD OF PRODUCING SEMI-FINISHED PRODUCTS FROM TWO-PHASE TITANIUM ALLOYS Russian patent published in 2017 - IPC C22F1/18 

FIELD: metallurgy.

SUBSTANCE: method of producing semi-finished products from two-phase titanium alloys comprising heating in β-area, deformation, cooling and cyclic processing. After heating in β-area to a temperature higher than a temperature of polymorphic transformation by 200-300°C, holding is carried out for 3-6 hours, deformation is carried out with degree of 60-95% during cooling to a temperature lower than a temperature of polymorphic transformation by 150-200°C. Phased cyclic processing is carried out, at first heating of the semi-finished product is carried out to a temperature lower than the temperature of polymorphic transformation by 100-130°C, holding at this temperature is carried out for 0.2-1.5 hours, deformation is carried out with degree of 20-50% during cooling to a temperature lower than the temperature of polymorphic transformation by 250-350°C. In the next stage the heating in β-area is carried out to a temperature higher than the temperature of polymorphic transformation by 20-30°C, holding at this temperature is carried out for 2-3 hours, deformation is carried out with a degree of 50-70% during cooling to a temperature lower than a temperature of polymorphic transformation by 200-250°C. In the last stage the heating in α+β-area is performed to a temperature lower than the temperature of polymorphic transformation by 150-200°C, holding at this temperature is carried out for 0.2-1 hours, deformation is carried out with a degree of 10-20% during cooling to a temperature lower than the temperature of polymorphic transformation by 150-180°C. Then, air cooling is carried out at the rate of 50-70°C/min to room temperature.

EFFECT: increased strength and plasticity of semi-finished products and ensured stability of strength and plastic properties.

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