METHOD FOR MANUFACTURING THIN SHEETS FROM TWO-PHASE TITANIUM ALLOYS Russian patent published in 2022 - IPC B21B3/00 C22F1/18 

FIELD: metallurgy.

SUBSTANCE: invention relates to manufacturing thin sheets from two-phase titanium alloys. An ingot undergoes preliminary thermomechanical processing in the β and α+β regions, resulting in a slab; the slab is subjected to multi-stage rolling resulting in semifinished rolled stock; the rolled stock is cut into sheet workpieces, the workpieces are straightened, assembled into a batch, rolled into sheets as part of the batch; and the sheets are subjected to thermal adjustage operations after batch rolling. The preliminary thermomechanical processing of an ingot is executed in two stages: at the first stage, the ingot is strained in the β region with a relative strain degree of at least 50% for the stage; at the second stage, the workpiece is deformed in the (α+β) region with a 25 to 50% degree for the stage, resulting in a slab. The multi-stage rolling of a slab is executed in three stages: at the first stage, the slab is rolled into a strip at a metal heating temperature 90–180 °C above the polymorphic transformation point (PTP) with a relative strain degree of 50 to 95% for the stage; at the second stage, the strip is rolled at a metal heating temperature 30–80 °C above the PTP with a relative strain degree of 30 to 70% for the stage, followed by reeling the strip into a roll; at the third stage, the strip is rolled, resulting in semifinished rolled stock, at a metal heating temperature 70–120 °C above the PTP with a relative strain degree of 30…70% for the stage. The batch rolling is executed transversely at a batch heating temperature 50–100 °C below the PTP with a 50 to 80% total relative strain degree of the sheet workpiece.

EFFECT: higher productivity of the production process, higher metal yield, better mechanical properties and structure of the sheets.

2 cl, 1 dwg, 2 tbl, 1 ex