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Title:
TITANIUM ALLOY BAR AND ITS MANUFACTURING METHOD
Document Type and Number:
Japanese Patent JP2020152972
Kind Code:
A
Abstract:
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, in a cross-section parallel with a longer axis direction of the titanium alloy bar, an area rate of α crystal grain aggregate having a circle equivalent diameter of smaller than 100 μm and an aspect ratio of smaller than 3.0 is 60% or larger, and an area rate of α crystal grains having a circle equivalent diameter within the range where angles θ, ω respectively formed by a normal line direction of a (0001) plane of close-packed hexagonal crystals constituting α crystal grains and a longer axis direction of the titanium alloy bar, and by the normal line direction and a peripheral direction of the titanium alloy bar in a cross-section orthogonal to the long axis are within the range of 0° or larger and 55° or smaller, of larger than 20 μm, is 15% or smaller is adopted.SELECTED DRAWING: Figure 2

Inventors:
MORI KENICHI
HASHIMOTO SHOTARO
MINAMINO KOYA
MUKAI TSUYOSHI
NISHI MASARU
SAKAMOTO TETSUYA
Application Number:
JP2019053489A
Publication Date:
September 24, 2020
Filing Date:
March 20, 2019
Export Citation:
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Assignee:
NIPPON STEEL CORP
International Classes:
C22C14/00; C22F1/18
Attorney, Agent or Firm:
Sumio Tanai
Mitsuo Teramoto
Tomomasa Katsumata
Hiroshi Yamaguchi