METHOD FOR PRODUCING BILLETS IN THE FORM OF A BAR FROM (A+B)-TITANIUM ALLOYS Russian patent published in 2021 - IPC C22F1/18 B21J1/04 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, in particular to methods for manufacturing forged blanks from (α+β)-titanium alloys by hot deformation. The method for making a billet in the form of a bar from (α+β)-titanium alloys includes forging an ingot into a bar in several passes at a temperature of the β-region, intermediate forging in several passes, and final deformation at a temperature of the (α+β)-area. The forging of the ingot in the β-area is carried out at a temperature Тpt+(70-170)°С with a forging value of 4.5-5.0 and with subsequent cooling of the billet in the form of a bar in air, the intermediate forging of the billet in the form of a bar is first carried out in (α+β)-area at a temperature of Тpt-40°С with a forging value of 1.5-1.6 per one transition, and then the workpiece in the form of a bar is heated in the β-area for recrystallization of the alloy at a temperature of Тpt+(70-170)°С and forging a billet in the form of a bar at this temperature with a forging value of 1.3-1.4, followed by cooling in air, the final forging into a bar is carried out in the (α+β)-area at a temperature of Tpt-40°С with a forging size 6.0-5.5, and then mechanical processing is carried out, where Тpt is the temperature of the polymorphic transformation of the alloy.

EFFECT: obtaining an alloy with a homogeneous finely dispersed microstructure with a grain size of (5.0-10.0) microns, containing an equiaxed-phase in an amount of (50-80)% in a transformed α-matrix without signs of β-grain boundaries.

4 cl, 1 dwg, 1 tbl, 3 ex