Titanium alloy forgings and its manufacturing method, and the ultrasonic inspection method

摘要

PROBLEM TO BE SOLVED: To provide a titanium alloy forged material which reduces noises during an ultrasonic flaw inspection while maintaining mechanical properties, such as fatigue strength, of a β forged material required in parts for aircraft, and a method for producing the same.;SOLUTION: A titanium alloy forged material includes a mixed grain structure of a flat particle which is a crystal grain of an old β grain with an aspect ratio of more than 3 and a non-flat particle which is a crystal grain of an old β grain with an aspect ratio of 1-3, wherein the equivalent circle diameter of the non-flat particle is 100 μm or less on an average, the flat particle with a diameter in the thickness direction of 20-500 μm is 40-98%, the non-flat particle with a diameter in the thickness direction of 10-150 μm is 2-50%, and the total of the flat particle and the non-flat particle with such diameters in the thickness direction is at least 90%.;COPYRIGHT: (C)2014,JPO&INPIT