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Tough corrosion-resistant titanium alloy and method for preparing same

A titanium alloy and corrosion-resistant technology, which is applied in the field of strong, tough, corrosion-resistant titanium alloys and their preparation, can solve the problems that the strength, toughness and corrosion resistance of titanium alloys are difficult to meet the industrial service standards, the wide application is limited, and the process is cumbersome, etc. The effect of strength improvement, grain refinement strengthening, and corrosion resistance improvement

Active Publication Date: 2018-11-27
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 titanium alloy preparation method is cumbersome, but also the strength, toughness and corrosion resistance of the titanium alloy obtained by this method are still difficult to meet the increasingly stringent industrial service standards, which limits the wide application

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preparation example Construction

[0035] The present invention also provides a method for preparing the strong and corrosion-resistant 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 blank obtained in the step (2) to obtain a strong, tough and corrosion-resistant 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, sp...

Embodiment 1

[0053] According to the alloy composition Ti-10Zr-6Al-4V-0.1Ru (mass percentage) ingredients, weigh 89.9g of industrial-grade titanium sponge, 10g of zirconium sponge, 6g of pure aluminum, 4g of pure vanadium, soak in absolute ethanol, and mix after ultrasonic cleaning. Put high-purity Ru0.1g, carry out air-drying, put in the water-cooled copper crucible of non-consumable vacuum arc melting furnace, the vacuum degree in the furnace chamber will be pumped to 8×10 -3 Below Pa, after filling high-purity argon gas as a protective gas (vacuum degree is 0.04-0.05MPa) before arc melting, the arc temperature is about 3000°C during each melting, and the melting time is about 2 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 smelted and turned over 5 times to ensure that the finally obtained ingot has a uniform composition.

[0054] Then heat the ...

Embodiment 2

[0056] According to the alloy composition Ti-20Zr-6Al-4V-0.1Ru (mass percentage) ingredients, weigh 68.839g of industrial-grade titanium sponge, 20.035g of zirconium sponge, 6g of pure aluminum wire, and 4g of high-purity vanadium. After cleaning, add 0.1g of high-purity Ru, air-dry, and put it into a water-cooled copper crucible in a non-consumable vacuum arc melting furnace. The vacuum degree in the furnace cavity 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 smelting, the arc temperature is about 2900°C during each smelting, and the smelting time is about 2 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-casting ingot is repeatedly smelted and turned over 7 times to ensure that the finally obtained ingot has a uniform composition.

[0057] Then heat the alloy ingot taken out to the rolling temper...

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Abstract

The invention provides tough corrosion-resistant titanium alloy and a method for preparing the same. The tough corrosion-resistant titanium alloy comprises, by weight, 5.56-6.75% of Al, 0.08-0.14% ofRu, 3.5-4.5% of V, higher than 0% and lower than or equal to 50% of Zr and the balance Ti. The tough corrosion-resistant titanium alloy and the method have the advantages that the strength and the corrosion resistance of the tough corrosion-resistant titanium alloy can be improved by means of alloying, infinite solid solution can be formed by the Zr and the Ti, and accordingly solid solution can be strengthened; the Zr is negative in initiating passive potential as compared with the Ti, and still can be passivated even in environments under weak oxidization conditions, accordingly, the capacity of generating dense oxidation films on surfaces can be improved, and the corrosion resistance of the surfaces can be enhanced; the stability of alpha phase can be greatly improved by the element Al,the beta-alpha transition temperatures can be greatly increased by the element Al, tiny alpha phase can be obtained after the tough corrosion-resistant titanium alloy is quenched, and fine grains canbe strengthened; the trace element Ru is added into the tough corrosion-resistant titanium alloy, and accordingly the corrosion resistance of the tough corrosion-resistant titanium alloy can be improved.

Description

technical field [0001] The invention relates to the technical field of titanium alloys, in particular to a strong, tough and corrosion-resistant 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 smelt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C14/00C22C16/00C22C30/00C22F1/18
CPCC22C1/02C22C14/00C22C16/00C22C30/00C22F1/002C22F1/18C22F1/183C22F1/186
Inventor 刘日平李波刘曙光姬朋飞马明臻张新宇
Owner YANSHAN UNIV
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