A kind of high-strength titanium alloy and preparation method thereof

A titanium alloy and high-strength technology, which is applied in the field of high-strength titanium alloy and its preparation, can solve the problems of short service life of titanium alloy aerospace structures and difficulty in meeting industrial service standards.

Active Publication Date: 2019-07-26
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a traditional titanium alloy for aeronautical structures, its strength level is still difficult to meet the increasingly stringent industrial service standards, resulting in a short service life of titanium alloy aeronautical structures, which limits further applications

Method used

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  • A kind of high-strength titanium alloy and preparation method thereof
  • A kind of high-strength titanium alloy and preparation method thereof
  • A kind of high-strength titanium alloy and preparation method thereof

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preparation example Construction

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

[0036] (1) Obtain the as-cast alloy billet after melting the alloy raw material;

[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) performing solution treatment on the densified alloy billet obtained in the step (2) to obtain a high-strength titanium alloy.

[0039] In the invention, the alloy raw material is smelted to obtain the cast alloy billet. In the present invention, there is no 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 to obtain the titanium alloy with the target composition. In the present invention, the alloy raw materials preferably include sponge titanium, sponge zirconium, pure aluminum, pure chrom...

Embodiment 1

[0052] Alloy composition by mass percentage: 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 10g, high-purity aluminum 4.5g, high-purity tin 1.5g, high-purity molybdenum 3.5g, high-purity chromium 3.5g and immerse in absolute ethanol for ultrasonic cleaning , air-dried after ultrasonic cleaning, and put it into a water-cooled copper crucible in a non-consumable vacuum arc melting furnace. The vacuum degree in the furnace chamber should be pumped to 8×10 -3 Below Pa, after filling high-purity argon as protective gas (vacuum degree 0.04-0.05MPa) before arc melting, the arc temperature is about 2500°C during each melting, and the melting 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, so that the smelting-casting ingot is repeatedly ...

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, soak them in absolute ethanol, and ultrasonically clean 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 filling high-purity argon as a protective gas (vacuum degree 0.04-0.05MPa) before arc melting, the arc temperature is about 2900°C during each melting, and the melting time is about 3 minutes, and each melting is completed After cooling, the ingot is obtained, and then the ingot is turned over for smelting, so that the smelting-casting ingot is repea...

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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] With a series of advantages such as high specific strength, high specific modulus, and corrosion resistance, titanium alloy has a wide range of application advantages, and has been valued in many fields such as marine engineering, aerospace, biomedicine, metallurgy, chemical industry, and light industry. [0003] Due to its excellent machinability and mechanical properties, structural titanium alloys are used in the manufacture of high-strength, complex-shaped parts in the aerospace industry, such as wing joint structural parts of aviation aircraft, fuselage and landing gear connection frames, and suspension engine joints. and other parts, as well as the production of important or key load-bearing parts that require high strength and durability. However, as a traditional titani...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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