HIGH-STRENGTH TITANIUM ALLOY FOR ADDITIVE MANUFACTURING Russian patent published in 2023 - IPC C22C14/00 C22F1/18 B33Y10/00 

FIELD: metallurgy; aerospace industry.

SUBSTANCE: invention relates to metallurgy, namely to high-strength alpha-beta titanium alloys for additive manufacturing, which can be used in the aerospace industry. A method for manufacturing an initial blank for additive manufacturing from a titanium alloy containing, wt.%: from 5.5 to 6.5 aluminium, from 3.0 to 4.5 vanadium, from 1.0 to 2.0 molybdenum, from 0, 3 to 1.5 iron, 0.3 to 1.5 chromium, 0.05 to 0.5 zirconium, 0.2 to 0.3 oxygen, not more than 0.05 nitrogen, not more than 0.08 carbon , not more than 0.25 silicon and the rest - titanium, the method includes the smelting of an ingot, the manufacture of a forged billet from it at the temperatures of beta and/or alpha-beta regions, machining of a forged billet, hot rolling of a machined forged billet at a temperature of beta and/or alpha -beta area to obtain a rolled billet, annealing the rolled billet at a temperature of 550-788°C (1022-1450°F) for at least 30 minutes, drawing the annealed rolled billet to a wire with a nominal diameter of not more than 3.175 mm (0.125 in) and annealing the wire at a temperature of 550-788°C (1022-1450°F) for at least 30 minutes. At the same time, the value of the structural aluminium equivalent [Al]_equiv of the titanium alloy is set in the range from 7.5 to 9.5 wt.%, the value of the structural molybdenum equivalent [Mo]_equiv of the titanium alloy is set in the range from 6.0 to 8.5 wt.%, and the equivalents are determined by the equations: [Al]_equiv = [Al] + [O] × 10 + [Zr]/6 and [Mo]_equiv = [Mo] + [V]/1.5 + [Cr] × 1.25 + [Fe] × 2.5.

EFFECT: high values of tensile strength and double shear strength while maintaining high plastic properties in the state after annealing.

12 cl, 9 dwg, 9 tbl, 3 ex