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US 2025/0059631 A1Published application
Alpha + beta titanium alloy shape and method for manufacturing the same
AssigneeNippon Steel Corporation
InventorsShinya NISHIYAMA, Tomoyuki KITAURA
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Abstract
An α+β titanium alloy shape includes an acicular microstructure, wherein a 0.2% proof stress is 830 MPa or more, an elongation is 10% or more, a fatigue strength is 450 MPa or more, an area fraction of voids is 1.0×10−5 % or less, a twist angle from one end to the other end is within ±3.0°, and a warpage height (mm)/total length (m) is within ±2.17.
Claims12
An α+β titanium alloy shape comprising an acicular microstructure, wherein
- a 0.2% proof stress is 830 MPa or more,
- an elongation is 10% or more,
- a fatigue strength is 450 MPa or more,
- an area fraction of voids is 1.0×10−5 % or less,
- a twist angle from one end to the other end is within ±3.0°, and
- a warpage height (mm)/total length (m) is within ±2.17.
3 more elements
A method for manufacturing an α+β titanium alloy shape comprising an acicular microstructure, wherein
- a 0.2% proof stress is 830 MPa or more,
- an elongation is 10% or more,
- a fatigue strength is 450 MPa or more,
- an area fraction of voids is 1.0×10−5 % or less
- a twist angle from one end to the other end is within ±3.0°, and a warpage height (mm)/total length (m) is within ±2.17, the method comprising:
- hot working an α+β titanium alloy to obtain a shape;
- heating the shape to a straightening temperature of equal to or higher than β transus temperature −400° C. and equal to or lower than β transus temperature −200° C., applying a strain of 0.1% or more and 8% or less in a longitudinal direction at the straightening temperature, and further applying a torque that makes a twist in the longitudinal direction of the shape within ±3.0%;
- and
- cooling the shape to 500° C. or lower while applying tensile stress and the torque to the shape.
6 more elements
Dependencies are inferred from the claim text.