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Improved heat treatable titanium alloy

A technology of titanium alloy and β-titanium alloy, which is applied in the field of titanium alloy composition, can solve problems such as inhomogeneity and hindering the mechanical properties of β-titanium alloy

Active Publication Date: 2020-06-02
MONASH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, continuous grain boundary α-phase, inhomogeneous α-precipitation, and relatively large β-grain size persist in β-titanium alloys, which hinder the improvement of the mechanical properties of β-titanium alloys.

Method used

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Embodiment Construction

[0014] In the case of use, for example, in the manufacture of titanium fasteners, the alloys of the invention typically undergo a series of procedures in which they are worked or deformed, such as but not limited to at least one of forging, rolling or extruding process steps. Thereafter, the alloy will typically undergo a homogenizing heat treatment and subsequently be fabricated into the desired form, for example by drawing. The alloy according to the invention and each of the two standard β-C titanium alloys were processed similarly in this manner. Table 1 lists the composition of selected alloys of the invention and shows a total carbon content of 0.101 wt%, while two standard beta-C alloys have respective residual carbon contents of 0.023 wt% and 0.014 wt%.

[0015] Among the alloys listed in Table 1, figure 1 In (a) is shown the microstructure obtained with the alloy of the invention and in (b) with the first β-C alloy, in each case for alloy after homogeneous heat tre...

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Abstract

A "modified" meta-stable # titanium alloy that, apart from carbon content, corresponds to the composition range for standard Beta-C titanium alloy. The modified alloy comprises vanadium, chromium, molybdenum, zirconium, aluminium, with maxima for oxygen, iron, nitrogen, hydrogen, yttrium, and other elements (apart from carbon and titanium), with a balance (apart from carbon) of titanium. The modified alloy has carbon present at a stable total carbon level sufficiently in excess of 0.05 wt.% achieving an improvement in the mechanical properties of UTS, DSS and fatigue strength in threaded regions, relative to standard Beta-C alloy with a specified carbon level below 0.05 wt.%, with a maximum carbon content controlled so as to preclude carbide formation having a detrimental effect on the level of fatigue strength.

Description

technical field [0001] The present invention relates to a titanium alloy composition which is heat treatable to obtain enhanced physical properties, particularly ultimate tensile strength (UTS) and where relevant double shear strength (DSS) and thread fatigue strength levels. Background technique [0002] Currently, a range of titanium alloy components are made from Ti-6Al-4V (Ti-64), an alpha / beta titanium alloy. This is especially true for titanium alloy fasteners, especially those used in aerospace applications. The fastener diameter of Ti-64 alloy is limited to less than 19.05mm (0.75 inches), and the mechanical property level within this diameter range is UTS 1100MPa, DSS655MPa and thread fatigue strength 440MPa, and the maximum cycle reaches 130,000 times. [0003] Other types of high-strength titanium fasteners are made from corresponding beta titanium alloys. The first one is a β-C alloy that meets the chemical composition of Ti-3Al-8V-6Cr-4Mo-4Zr, and under the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22F1/18F16B31/00F16B33/00B33Y70/00
CPCC22C14/00C22F1/183F16B31/06
Inventor 新华·吴西根·周
Owner MONASH UNIV