High-strength titanium alloy and preparation method thereof

A titanium alloy, high-strength technology, applied in the field of high-strength titanium alloy and its preparation, can solve the problems that the strength level is difficult to meet the industrial service standard, and the service life of titanium alloy aerospace structures is short.

Active Publication Date: 2018-11-30
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as a traditional titanium alloy for aeronautical structures, its strength level is still difficult to meet the increasingly strin...

Method used

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  • High-strength titanium alloy and preparation method thereof
  • High-strength titanium alloy and preparation method thereof
  • High-strength titanium alloy and preparation method thereof

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[0035] The present invention also provides the preparation method of the high-strength titanium alloy described in the above technical solution, comprising the following steps:

[0036] (1) obtaining the as-cast alloy billet after the alloy raw material is smelted;

[0037] (2) deforming the as-cast alloy billet obtained in the step (1) after heat preservation treatment to obtain a densified alloy billet;

[0038] (3) subjecting the densified alloy blank obtained in the step (2) to a solution treatment to obtain a high-strength titanium alloy.

[0039] In the present invention, the alloy raw material is smelted to obtain an as-cast alloy blank. The present invention does not have a special limitation on the type of the alloy raw material, and the alloy raw material well-known to those skilled in the art is used in order to obtain the titanium alloy of the target composition. In the present invention, the alloy raw material preferably includes sponge titanium, sponge zirconium,...

Embodiment 1

[0052] Alloy composition by mass percentage Alloy composition: Ti balance, Zr: 10%, Al: 4.5%, Sn: 1.5%, Mo: 3.5%, Cr: 3.5% (Ti-10Zr-4.5Al-3.5Mo-3.5Cr- 1.5Sn) ingredients, weigh (the total mass of raw materials is 100g) industrial grade zirconium sponge, 4.5g high-purity aluminum, 1.5g high-purity tin, 3.5g high-purity molybdenum, and 3.5g high-purity chromium, and immerse them in absolute ethanol for ultrasonic cleaning. , air-dried after ultrasonic cleaning, placed in a water-cooled copper crucible of a non-consumable vacuum arc melting furnace, and the vacuum degree in the furnace cavity should be pumped to 8 × 10 -3 Below Pa, after the arc smelting is filled with high-purity argon gas as a protective gas (vacuum degree is 0.04-0.05MPa), the arc temperature is about 2500 ℃ during each smelting, and the smelting time is about 3 minutes each time. After the smelting is completed, the ingot is cooled to obtain the ingot, and then the ingot is turned over for smelting, and the s...

Embodiment 2

[0055] Alloy composition by mass percentage Alloy composition: Ti balance, Zr: 20%, Al: 4.8%, Sn: 1.8%, Mo: 3.7%, Cr: 3.7% (Ti-20Zr-4.8Al-3.7Mo-3.7Cr- 1.8Sn) ingredients, weigh (the total mass of raw materials is 100g) 20g of industrial-grade zirconium sponge, 4.8g of high-purity aluminum, 1.8g of high-purity tin, 3.7g of high-purity molybdenum, and 3.7g of high-purity chromium, immersed in absolute ethanol, and ultrasonically cleaned. After air-drying, put it into the water-cooled copper crucible of the non-consumable vacuum arc melting furnace, and the vacuum degree in the furnace cavity should be pumped to 8×10 -3 Below Pa, after the arc smelting is filled with high-purity argon gas as a protective gas (vacuum degree is 0.04-0.05MPa), the arc temperature is about 2900 ℃ during each smelting, and the smelting time is about 3 minutes, and each smelting is completed. After cooling, the ingot is obtained, and then the ingot is turned over for smelting, so that the smelting-cast...

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Abstract

The invention provides a high-strength titanium alloy and a preparation method thereof. The high-strength titanium alloy comprises, by mass, 4.5%-5.5% of Al, 3.5%-4.5% of Mo, 3.5%-4.5% of Cr, 1.5%-2.5% of Sn, 10%-50% of Zr and the balance Ti. According to the high-strength titanium alloy and the preparation method thereof, the content of all the elements is strictly controlled, and the mechanicalproperty of the titanium alloy is improved; the Cr element is added, therefore, a beta phase is stabilized, and the room-temperature strength of a titanium alloy matrix can be significantly improved;the Al element greatly improves the stability of an alpha phase and increases the beta-alpha conversion temperature, the uniform and fine alpha phase can be conveniently obtained after quenching in the solution treatment process, and the specific strength of the titanium alloy can be significantly improved; and in addition, lattice distortion can be caused due to addition of the Zr element, the defects can cause nucleation point increasing and nucleation density increasing in the nucleation process, the grain refinement effect is achieved, and then fine crystal strengthening is achieved.

Description

technical field [0001] The invention relates to the technical field of titanium alloys, in particular to a high-strength titanium alloy and a preparation method thereof. Background technique [0002] Titanium alloy has a series of advantages such as high specific strength, high specific modulus and corrosion resistance, and has a wide range of application advantages. [0003] With its excellent machinability and mechanical properties, structural titanium alloys are used in the manufacture of high-strength and complex-shaped parts in the aerospace industry, such as wing joint structural parts of aircraft, fuselage and landing gear connection frames, suspension engine joints and other parts, as well as the production of important or key load-bearing components that require high strength and durability. However, as a traditional titanium alloy for aeronautical structures, its strength level is still difficult to meet the increasingly demanding industrial service standards, res...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C16/00C22C30/04C22C1/02C22F1/18
CPCC22C1/02C22C14/00C22C16/00C22C30/04C22F1/183C22F1/186
Inventor 刘日平姬朋飞刘曙光李波马明臻张新宇
Owner YANSHAN UNIV
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