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Ti-Al-Zr-Cr-series martensitic titanium alloy and preparation method thereof

A titanium alloy and Martensite technology, applied in the field of high-performance alloy materials, can solve problems such as plasticity reduction, achieve low cost, improve coordinated deformation ability, and excellent room temperature mechanical properties

Active Publication Date: 2020-07-10
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these two factors increase the strength of the alloy, they also cause a significant decrease in plasticity.

Method used

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  • Ti-Al-Zr-Cr-series martensitic titanium alloy and preparation method thereof
  • Ti-Al-Zr-Cr-series martensitic titanium alloy and preparation method thereof
  • Ti-Al-Zr-Cr-series martensitic titanium alloy and preparation method thereof

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preparation example Construction

[0028] The preparation method of the above-mentioned Ti-Al-Zr-Cr series martensitic titanium alloy comprises the following steps:

[0029] (1) According to the composition design, select the corresponding raw materials for alloy batching and mix them evenly, and then use the cold crucible suspension melting method (CCLM) to melt the alloy;

[0030] (2) Argon gas is introduced during the melting process, the induction current is 350-400A, and the current frequency is 20-25KHz. After the alloy is completely melted, it is kept for 3-5 minutes, and the ingot is obtained by cooling;

[0031] Specifically, the raw materials are loaded into the furnace in bulk and obtained ingots through five suspension smelting;

[0032] (3) After the ingot has been peeled off and the riser is cut, it is free forged on a hammer (open billet forging and high temperature forging) to obtain Ti-Al-Zr-Cr series martensitic titanium alloy;

[0033] Among them, the blank forging temperature is 1100-1150°C...

Embodiment 1

[0038] A Ti-Al-Zr-Cr martensitic titanium alloy is composed of the following components in weight percentage: 5.15-5.30% of Al, 4.45-4.60% of Zr, 2.65-2.80% of Cr, and the balance is Ti and unavoidable impurities.

[0039] The preparation method is as follows:

[0040] According to the above composition, the alloy was prepared by suspension melting in cold crucible and free forging on hammer. Specifically, high-purity titanium, high-purity aluminum, high-purity zirconium, and high-purity chromium are uniformly mixed according to the proportion and loaded into the furnace in bulk, and then smelted. The process is all carried out in a high-purity argon environment. The frequency is 20-25KHz. In order to ensure uniform composition, the alloy was smelted 5 times, and the ingot was turned upside down before each smelting and loaded into the furnace. After the riser is cut off from the ingot, billet forging and high temperature forging are carried out to obtain Ti-Al-Zr-Cr marten...

Embodiment 2

[0052] A Ti-Al-Zr-Cr martensitic titanium alloy is composed of the following components in weight percent: 5.15 to 5.30% of Al, 4.45 to 4.60% of Zr, 2.65 to 2.80% of Cr, and the balance is Ti and unavoidable impurities.

[0053] The preparation method of Ti-Al-Zr-Cr series martensitic titanium alloy is as follows:

[0054] According to the above composition, the alloy was prepared by suspension melting in cold crucible and free forging on hammer.

[0055] Specifically, high-purity titanium, high-purity aluminum, high-purity zirconium, and TiCr master alloy are uniformly mixed according to the proportion and loaded into the furnace in bulk, and then smelted. The process is all carried out in a high-purity argon environment. The frequency is 20-25KHz. In order to ensure uniform composition, the alloy was smelted 5 times, and the ingot was turned upside down before each smelting and loaded into the furnace. After the riser is cut off from the ingot, billet forging and high tem...

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Abstract

The invention discloses a Ti-Al-Zr-Cr-series martensitic titanium alloy and a preparation method thereof. The Ti-Al-Zr-Cr-series martensitic titanium alloy comprises the following components of, by weight, 5.0%-6.0% of Al, 4.0%-5.0% of Zr, 2.0%-3.0% of Cr and the balance Ti. The alloy can obtain high strength and high plasticity at the same time after undergoing smelting, forging and solid solution and water quenching treatment. According to the titanium alloy, a certain amount of neutral element, namely Zr is added while Al is added, so that a martensitic alpha' phase and an alpha phase are further strengthened; and a certain amount of Cr element is added, so that the martensitic alpha' phase and a beta matrix are strengthened; compared with beta stable elements such as Mo, V and Nb, theAl, Zr and Cr elements selected in the alloy are low in price and melting point, and the purposes of reducing the raw material cost and the smelting energy consumption cost are achieved at the same time.

Description

technical field [0001] The invention belongs to the technical field of high-performance alloy materials, and specifically relates to a Ti-Al-Zr-Cr series martensitic titanium alloy and a preparation method thereof. Background technique [0002] For existing high-strength titanium alloys, the commonly used alloying scheme is to add Mo, V, Nb, Ta and other crystal form β-stable elements with a mass fraction of more than 10%, but the price of pure metal or intermediate alloy raw materials required for adding these alloy elements Much higher than sponge titanium, resulting in high production costs of titanium alloys. At the same time, these isomorphic β-stable elements have high melting points, are prone to problems such as component segregation, and have high requirements for smelting processes. [0003] Recently, researchers have found that alloys such as TC4 (Ti-6Al-4V), Ti-5Al-3Mo-1.5V, and Ti-4Mo can obtain a martensite structure with a certain strengthening ability after ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/02C22F1/18
CPCC22C1/02C22C14/00C22F1/183
Inventor 张金钰包翔云陈威张东东刘刚孙军
Owner XI AN JIAOTONG UNIV
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