α＋β型チタン合金棒材及びその製造方法

Japanese Patent JP7307314

B2

To provide a titanium alloy bar having excellent Dwell fatigue characteristics and its manufacturing method.SOLUTION: A titanium alloy bar that is a titanium alloy bar having a metallographic structure having two phases made of an α phase as a main phase and a β phase as a second phase, in which an area rate of α crystal grains having an angle θ1 formed by a normal line direction of a close-packed hexagonal crystal (0001) plane constituting α crystal grains and a longer axis direction of the titanium alloy bar within the range of 0° or larger and 25° or smaller and having a circle equivalent diameter larger than 20 μm is 5.0% or smaller, an area rate of α crystal grains having the angle θ1 formed with the longer axis direction within the range of 25° or larger and 55° or smaller and having a circle equivalent diameter larger than 20 μm is 2.0% or smaller, and an area rate of α crystal grains having an angle θ2 formed by a normal line direction of a close-packed hexagonal crystal (10-10) plane constituting α crystal grains and the longer axis direction within the range of 0° or larger and 30° or smaller is 40% or larger is adopted.SELECTED DRAWING: Figure 1

WO/2005/064026	SUPER ELASTICITY AND LOW MODULUS TI ALLOY AND ITS MANUFACTURE PROCESS
JP3481428	TI-FE-O-N HIGH STRENGTH TITANIUM ALLOY PLATE SMALL IN IN-PLANE ANISOTROPY, AND ITS MANUFACTURE

Kenichi Mori
Shotaro Hashimoto
Kouya Minamino
Takeshi Mukai
Yuu Nishi
Tetsuya Sakamoto

JP2019053488A

July 12, 2023

March 20, 2019

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Nippon Steel Corporation

C22C14/00; C22F1/18

JP63206442A
JP2016199796A
JP2012224935A
JP1242743A

Sumio Tanai
Mitsuo Teramoto
Tomoo Katsumata
Hiroshi Yamaguchi

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