Method for producing a titanium alloy forgings and its manufacturing method, as well as titanium alloy forged parts

摘要

PROBLEM TO BE SOLVED: To provide: a titanium alloy forging material in which while a mechanical characteristic of a β forging material required to an aircraft component such as fatigue strength is maintained, noise at ultrasonic testing is reduced; and a production method of the same.;SOLUTION: A titanium alloy forging material is characterized in that an aspect ratio of an old β particle is at least 2 and at most 10 by average, an average angle among θ₁, θ₂, θ₃ and θ₄ which an old β grain boundary makes with a line parallel to a forging direction is at most 80°, a length l_α in an old β grain boundary direction of an α phase formed on the old β grain boundary is at most 15 μm by average.;COPYRIGHT: (C)2014,JPO&INPIT