METHOD FOR MANUFACTURING SHEETS FROM OT4 TITANIUM ALLOY Russian patent published in 2018 - IPC C22F1/18 B21B3/00 

FIELD: metallurgy.

SUBSTANCE: method for manufacturing sheets from OT4 titanium alloy includes deformation of ingot into a slab, mechanical treatment of the slab, multi-stage rolling of slab on the rolling stock, cutting of the rolled stock into sheet blanks, their assembly into a pack, rolling of the sheet blanks into sheets in the composition of the stack and the finishing operations of sheets after the pack rolling. The ingot is deformed into slab in two stages. At the first stage in βregion the temperature range above the temperature of polymorphic transformation (TPT) by 150-250°C with total deformation degree 30-80%, and at the second stage (α+β)-region within the temperature range below the TPT by 30-50°C with total deformation degree of 20-50%, multi-stage slab rolling is carried out sequentially in four stages. At the first stage in βregion within the temperature range above the TPT by 90-160°C with total deformation degree of 30-90%, at the second stage (α+β) region within the temperature range below the TPT by 30-70°C with total deformation degree of 15-40%, at the third stage in βregion within the temperature range above the TPT by 90-160°C with total deformation degree of 15-25% and at the fourth stage (α+β) region within the temperature range below the TPT by 30-70°C with total deformation degree of 40-70%, the stock is cut into sheet blanks and they are assembled into a pack, sheet blank is laid to provide perpendicularity of the previous rolling of sheet blank to the direction of subsequent rolling of sheet blank, and the pack is rolled for ready size within the range of temperatures below TPT by 30-70°C with total deformation degree of 40-70%.

EFFECT: produced sheets have high plasticity values, low anisotropy of mechanical properties.

5 dwg, 3 tbl