Near-alpha-phase high-strength-and-toughness titanium alloy and preparation method thereof

A tough titanium alloy and high-strength technology, which is applied in the field of near-α-phase high-strength and tough titanium alloy and its preparation, can solve the problems of high cost, complicated process, cumbersome process, etc., and achieve the effect of maintaining elongation.

Inactive Publication Date: 2018-11-30
YANSHAN UNIV
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Problems solved by technology

However, the patent adopts both smelting and powder metallurgy technologies, the process is complex and the cost is high
For another example, Chinese patent CN97119996.5 belongs to the technical field of metal heat treatment. First, the titanium-aluminum alloy casting is subjected to high-temperature treatment in the α phase region by hot isostatic pressing, followed by cyclic heat treatment and eutectoid temperature isothermal treatment, and finally critical temperature However, this solution requires the simultaneous use of smelting, hot isostatic pressing and cyclic heat treatment technologies, with complex procedures and high costs
Not only the existing preparation methods of titanium alloys are cumbersome, but also the strength and toughness of titanium alloys obtained in this way are still difficult to meet the increasingly stringent industrial service standards, which limits their wide application. It is necessary to further improve their strength, thereby expanding the performance of titanium alloys and expanding their applications. scope

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  • Near-alpha-phase high-strength-and-toughness titanium alloy and preparation method thereof
  • Near-alpha-phase high-strength-and-toughness titanium alloy and preparation method thereof
  • Near-alpha-phase high-strength-and-toughness titanium alloy and preparation method thereof

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preparation example Construction

[0035] The present invention also provides a method for preparing the near-α-phase high-strength and tough 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) The densified alloy billet obtained in the step (2) is subjected to solution treatment to obtain a near-α-phase high-strength and tough 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 zirconium ...

Embodiment 1

[0054] According to the alloy composition Ti-10Zr-3Al-2.5V-0.08Pd (mass percentage) ingredients, weigh industrial grade sponge titanium 89.2351g, sponge zirconium 10.5604g, pure aluminum 3.1681g, pure vanadium 2.6401g and pure palladium 0.0918g and soak in In anhydrous ethanol, after ultrasonic cleaning, air-dry, put into a water-cooled copper crucible of a non-consumable vacuum arc melting furnace. The inner wall of the copper crucible should be cleaned and wiped clean in advance to avoid bringing in other impurities. The degree should be drawn to 8×10 -3 Below Pa, after filling high-purity argon as protective gas (vacuum degree 0.04-0.05MPa) before arc smelting, the arc temperature is about 2600°C during each smelting, and the smelting time is about 60s. 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 5 times to ensure that the composition of the finally obtained in...

Embodiment 2

[0059] According to the alloy composition Ti-20Zr-3Al-2.5V-0.05Pd (mass percentage) ingredients, weigh industrial grade sponge titanium 78.2193g, sponge zirconium 20.9985g, pure aluminum 3.1498g, pure vanadium 2.6248g and pure palladium 0.0553g and soak in In anhydrous ethanol, after ultrasonic cleaning, air-dry, put into a water-cooled copper crucible of a non-consumable vacuum arc melting furnace. The inner wall of the copper crucible should be cleaned and wiped clean in advance to avoid bringing in other impurities. The degree should be drawn 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 3000°C during each melting, and the time of each melting is about 50s. 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 5 times to ensure that the composition of the finally obtain...

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Abstract

The invention provides a near-alpha-phase high-strength-and-toughness titanium alloy and a preparation method of the near-alpha-phase high-strength-and-toughness titanium alloy. The near-alpha-phase high-strength-and-toughness titanium alloy comprises 2.5-3.5% of Al, 2.0-3.0% of V, 0.001-0.08% of Pd, no more than 50% of Zr and the balance of Ti. The addition of Zr can lead to lattice distortion. As results of the defects, in the nucleation process, the number of nucleating points increases, the nucleation density increases as well, grain refining can be conducted, and therefore fine-grain strengthening is achieved. Experimental results show that the yield strength and tensile strength of the near-alpha-phase high-strength-and-toughness titanium alloy increase by 34% and 35.9% respectively,and the rate of elongation remains appropriate.

Description

technical field [0001] The invention relates to the technical field of titanium alloys, in particular to a near-alpha-phase high-strength and tough titanium alloy and a preparation method thereof. Background technique [0002] Titanium and titanium alloys are widely used in marine engineering, aerospace, biomedical engineering, metallurgy, chemical industry, light industry and many other fields. With the widespread application of titanium and titanium alloys, the development of industry and the service environment have put forward more stringent requirements on the performance of titanium alloys. It is difficult for traditional titanium alloys to meet the current engineering application standards in terms of strength and corrosion resistance. The high-strength titanium corrosion-resistant alloy is one of the key directions of research, development and application at present. [0003] For example, Chinese patent CN01140046.3 discloses a titanium-aluminum alloy prepared by sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C16/00C22C30/00C22C1/02C22F1/18
CPCC22C14/00C22C1/02C22C16/00C22C30/00C22F1/183C22F1/186
Inventor 刘日平姬朋飞张星李波马明臻张新宇
Owner YANSHAN UNIV
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