To provide a method of manufacturing an α+β titanium alloy having high strength, ductility, and fatigue strength, free from defects, such as deformation and crack, and having high reliability at lower manufacturing costs than heretofore, and equipment used for it.
In the manufacturing method, an α+β titanium alloy is pressurized and heated to a temperature not lower than (β-transformation point of this alloy -200°C) while being subjected to pressure of ≥100 MPa, preferably ≥300 MPa, to undergo pressure heat treatment and is then cooled, while keeping the pressure, down to ≤600°C at ≥10°C/min cooling rate and further held at 400-600°C for ≥1 hr to undergo aging treatment or is subjected, after the pressure heat treatment, to cooling down to ≤300°C, to plastic working, and further to aging treatment. The manufacturing equipment has, inside a pressure vessel, two or more independent heating devices and a movable stand for moving a material to be treated or further has a heat insulating wall between the heating devices.
KOIKE JUNICHI
FUJINAGA YASUO
