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Titanium alloy with high strength, high plasticity and good fracture toughness and preparing technology of titanium alloy

A fracture toughness and preparation process technology, applied in the field of material science, can solve the problems of high addition amount, difficult alloy melting, low elongation, etc., and achieve the effect of high plastic fracture toughness, high strength level, and good fracture toughness.

Inactive Publication Date: 2017-09-29
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Application Information

AI Technical Summary

Problems solved by technology

β-C (Ti-3Al-8V-6Cr-4Mo-4Zr), as a high-strength β-type titanium alloy, can obtain a tensile strength of more than 1400MPa and Fracture toughness but less than 5% elongation
The situation of β-21S (Ti-15Mo-3Al-2.7Nb-0.25Si) alloy is similar, and the alloy melting becomes difficult due to the high addition of Mo

Method used

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  • Titanium alloy with high strength, high plasticity and good fracture toughness and preparing technology of titanium alloy
  • Titanium alloy with high strength, high plasticity and good fracture toughness and preparing technology of titanium alloy

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Embodiment Construction

[0041] The present invention is described in detail below in conjunction with embodiment.

[0042] The alloy composition of each embodiment is shown in Table 1. After three vacuum consumable smelting, alloy ingots with the composition shown in Table 1 were prepared, and the phase transition point was measured by metallographic method. The ingot was free forged for multiple times, and the last forging in Examples 1, 2, 3 and 5 was in the two-phase region, the heating temperature was 750°C, and the deformation was 40%. In Example 4, two processes were used for the last forging: ① two-phase zone forging heated at 750°C (30% deformation) and ② single-phase zone forging heated at 850°C (60% deformation). All examples end up with rod-shaped billets of 60×60×L (length). The forgings were subjected to solution and aging heat treatment, and their tensile properties and fracture toughness were tested. The mechanical properties after heat treatment are given in Table 2, where σ 0.2 , ...

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Abstract

The invention discloses a titanium alloy with high strength, high plasticity and good fracture toughness and a preparing technology of the titanium alloy and belongs to the technical field of the material science. The titanium alloy includes, by weight percent, 2.5%-6.0% of Al, 6.5%-8.5% of Mo, 0%-3.0% of V, 1.5%-4.5% of Cr, 0.7%-2.0% of Fe, 0%-2.5% of Zr, 0.05%-0.2% of O and the balance Ti and inevitable impurities. The titanium alloy with the component feature is subjected to proper deformation and heat treatment, and therefore the titanium alloy with the tensile strength being 1450 MPa or above, the ductility being not smaller than 5% and the fracture toughness being not smaller than the value (please see the value in the specification) can be obtained, good toughness performance is achieved, and the titanium alloy is suitable for being applied to structural parts which work under the room temperature and have the requirements for high strength and good fracture toughness.

Description

technical field [0001] The invention relates to the field of material science and technology, in particular to a titanium alloy with high strength, high plasticity and good fracture toughness and a preparation process thereof. Background technique [0002] Due to its high specific strength, excellent corrosion resistance and certain high temperature oxidation resistance, titanium alloys are widely used in aerospace, petrochemical and marine equipment technology fields. [0003] When titanium alloys are used as structural parts, in some applications, not only the strength and plasticity of the material must be considered, but also its damage tolerance performance, that is, a certain level of fracture toughness (high plane fracture toughness) and below a certain level must be considered. Crack growth velocity at the limit; for the same level of strength, it is desirable for the material to have as high a fracture toughness as possible. Different structural parts require diffe...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22F1/18
CPCC22C14/00C22F1/002C22F1/183
Inventor 吴颖关少轩
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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