PROBLEM TO BE SOLVED: To provide a titanium alloy forged material which reduces the noise when the test is applied with an ultrasonic flaw-detection while keeping the mechanical characteristic of the 尾 forged material needed to aircraft parts such as fatigue-strength; and a method for producing the same. ! SOLUTION: This titanium alloy forged material having mixed granular structure of flat grains of the prior尾 grain, in which the diameter in the thickness direction is 50-500 渭m and the aspect ratio exceeds 3, and non-flat grains of the prior 尾 grain, in which the diameter of the direction is 30-200 渭m and the aspect ratio is 1-3 has such peculiarity that the flat grains are 40-99% and the non-flat grains are 1-60%, and the sum total of the flat grains and the non-flat grains exisits in 鈮？0%. ! COPYRIGHT: (C)2013,JPO&INPIT
