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A kind of 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 problem that the strength level is difficult to meet the industrial service standard

Active Publication Date: 2020-11-13
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 aerospace structures, its strength level is still difficult to meet the increasingly stringent industrial service standards

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

[0034] The present invention also provides a method for preparing the high-strength titanium alloy described in the above technical solution, comprising the following steps:

[0035] (1) Obtain the as-cast alloy billet after melting the alloy raw material;

[0036] (2) deforming the as-cast alloy billet obtained in the step (1) after heat preservation treatment to obtain a densified alloy billet;

[0037] (3) performing solution treatment on the densified alloy billet obtained in the step (2) to obtain a high-strength titanium alloy.

[0038] 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 chr...

Embodiment 1

[0051] According to alloy composition Alloy composition: Ti balance, Zr: 10%, Al: 2.2%, Mo: 4.5%, V: 4.0%, Si: 0.001% (mass percentage) ingredients, weighed (the total mass of raw materials is 100g) industrial 10g of high-grade sponge zirconium, 2.2g of high-purity aluminum, 4.5g of high-purity molybdenum, 4.0g of high-purity vanadium, and 0.001g of silicon are immersed in absolute ethanol for ultrasonic cleaning, air-dried after ultrasonic cleaning, and placed in a non-consumable vacuum arc melting furnace In the water-cooled copper crucible, the vacuum 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 re...

Embodiment 2

[0054] According to alloy composition Alloy composition: Ti balance, Ti balance, Zr: 20%, Al: 2.5%, Mo: 4.7%, V: 4.2%, Si: 0.01% (mass percentage) ingredients, weigh (total mass of raw materials 100g) industrial grade sponge zirconium 20g, high-purity aluminum 2.5g, high-purity molybdenum 4.7g, high-purity vanadium 4.2g, silicon 0.01g soak in absolute ethanol, after ultrasonic cleaning, air-dry, put into non-consumable vacuum arc melting In the water-cooled copper crucible of the furnace, the vacuum 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 repeatedly smelted and turned over 7 times to ensure that the finally obt...

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Abstract

The invention provides a high-strength titanium alloy and a preparation method thereof. The high-strength titanium alloy comprises the following components in percentages by mass: 2.2-3.8% of Al, 4.5-5.5% of Mo, 4.0-5.0% of V, less than or equal to 0.15% of Si, greater than 0 and less than or equal to 50% of Zr and the balance of Ti. The contents of various elements are controlled strictly, the mechanical property of the titanium alloy is improved, due to addition of the Zr element, lattice distortion may be caused, by the defects, nucleation points are increased in a nucleation process, the density of nucleation is increased, a grain refinement effect is achieved, and refined crystalline strengthening is carried out; by V, the ability of the alloy of formation of a beta phase is enhanced;by V, alpha+ beta transformation temperature is slightly reduced, the solubility of V in alpha-Zr and alpha-Ti is quite small, an intermediate phase between V and Ti and an intermediate phase betweenV and Zr are separately TiV2 and ZrV2, and by dispersion of the two phases in a matrix, the strength can be improved; and by addition of V, crystalline grains can be refined, and the strength is improved.

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): C22C1/02C22C14/00C22C16/00C22C30/00C22F1/18
CPCC22C1/02C22C14/00C22C16/00C22C30/00C22F1/002C22F1/18C22F1/183C22F1/186
Inventor 刘日平刘曙光姬朋飞马明臻景勤张新宇刘永
Owner YANSHAN UNIV
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