WIRE FROM α+β-TYPE TITANIUM ALLOY AND METHOD FOR PRODUCING WIRE FROM α+β-TYPE TITANIUM ALLOY Russian patent published in 2021 - IPC C22C14/00 C22F1/18 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely to the manufacture of wire from a titanium alloy α+β-type, and can be used in the manufacture of elements with high fatigue strength. The α+β-type titanium alloy wire contains, wt.%: Al from 4.50 to 6.75, Si from 0 to 0.50, C 0.080 or less, N 0.050 or less, H 0.016 or less, O 0.25 or less, at least one element selected from: Mo from 0 to 5.5, V from 0 to 4.50, Nb from 0 to 3.0, Fe from 0 to 2.10, Cr from 0 to less than 0.25, Ni from 0 to less than 0.15, Mn from 0 to less than 0.25, and the rest is Ti and impurities. The average ratio of the crystal grain sizes of the-phase along the long axis and along the short axis located orthogonal to the long axis is from 1.0 to 3.0, the maximum crystal grain diameter of the-phase is 30.0 mcm or less, the average crystal grain diameter grains of the-phase is from 1.0 to 15.0 mcm and in the section orthogonal to the direction of the longitudinal axis of the wire, the fraction of the area of ​​the crystal grain of the α-phase among the crystal grains of the-phase, in which the angle between the direction of the c-axis of the crystal grain is α-phase with a hexagonal close packing of the lattice and the direction of the longitudinal axis of the wire is from 15 to 40°, is 5.0% or less. The method of making wire includes the first stage, in which the rod is rolled or drawn into the wire once, twice or repeatedly at a temperature from 0 to 500°С, providing a relative narrowing at a time of 10-50% and a total relative narrowing of 50% or more, and the second a stage in which the wire obtained in the first stage is subjected to heat treatment.

EFFECT: invention provides high fatigue properties.

6 cl, 5 dwg, 8 tbl, 2 ex