High-strength and high-toughness metastable beta titanium alloy and preparation method thereof

A beta titanium alloy, metastable technology, applied in metal rolling, metal rolling, temperature control and other directions, can solve problems such as difficulty in meeting, and achieve the effect of reducing alloy cost, simplifying processing technology, and improving yield strength

Active Publication Date: 2021-01-22
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For Ti-10V-2Fe-3Al and Ti-5Al-5Mo-5V-3Cr-1Zr systems, the yield strength after aging is generally about 1300MPa, but with the development of science and technology, the strength of existing materials has become more and more It is difficult to meet the needs of a new generation of high-strength and high-toughness titanium alloys

Method used

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  • High-strength and high-toughness metastable beta titanium alloy and preparation method thereof
  • High-strength and high-toughness metastable beta titanium alloy and preparation method thereof
  • High-strength and high-toughness metastable beta titanium alloy and preparation method thereof

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preparation example Construction

[0039] A method for preparing a high-strength and high-toughness metastable β-titanium alloy, comprising the following steps:

[0040] Step 1. Mix high-purity titanium, high-purity aluminum, high-purity vanadium, high-purity molybdenum, high-purity chromium and high-purity zirconium uniformly according to the above mass percentage and load them in bulk into the furnace;

[0041]The weight percentage of each element is 4.5-5.5% of Al, 6.5-9.0% of Mo, 1-4% of V, 1.5-4% of Cr, 1-2.5% of Zr, and the balance is Ti and some other unavoidable elements. Avoid impurities.

[0042] Step 2. Under an argon atmosphere, the alloy mixture formed in step 1 is smelted multiple times, and an ingot is obtained after cooling, as follows:

[0043] Vacuum non-consumable smelting furnace is used for smelting, argon gas is introduced during the smelting process, the induction current is 450-500A, and the current frequency is 20-25KHz. After the alloy is completely melted, it is kept for 3-5 minutes,...

Embodiment 1

[0055] A method for preparing a high-strength and high-toughness metastable β-titanium alloy, comprising the following steps:

[0056] Step 1. According to the mass percentage, mix 4.5% Al, 6.5% Mo, 1% V, 1.5% Cr, 1% Zr, the balance is Ti and other unavoidable impurities, and mix the elements Evenly and bulk into the furnace;

[0057] Step 2. Use a vacuum non-consumable melting furnace for smelting. During the smelting process, argon gas is introduced, the induction current is 450A, and the current frequency is 20KHz. After the alloy is completely melted, it is kept for 3 minutes. After cooling, an ingot is obtained, and then the ingot is cast Turn over and continue smelting, the number of smelting is 2, and the ingot will be obtained after the smelting is completed.

[0058] Step 3. Homogenizing the ingot at high temperature for heat treatment at a temperature of 1000° C. for 1 hour.

[0059] Step 4. Hot-roll the homogenized ingot in the single-phase area. The hot-rolling t...

Embodiment 2

[0063] A method for preparing a high-strength and high-toughness metastable β-titanium alloy, comprising the following steps:

[0064] Step 1. According to the mass percentage, mix 4.4% Al, 8.6% Mo, 3.4% V, 1.6% Cr, 1.4% Zr, and the balance is Ti and other unavoidable impurities, and mix the elements Evenly and bulk into the furnace;

[0065] Step 2. Use a vacuum non-consumable melting furnace for melting. During the melting process, argon gas is introduced. The induction current is 475A, and the current frequency is 23KHz. After the alloy is completely melted, it is kept for 4 minutes. After cooling, an ingot is obtained, and then the ingot is cast Turn over and continue smelting, the number of smelting is 5, and the ingot will be obtained after the smelting is completed.

[0066] Step 3. Homogenizing the ingot at high temperature for heat treatment at a temperature of 1000° C. for 1 hour.

[0067] Step 4. Hot-roll the homogenized ingot in the single-phase zone. The hot-rol...

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Abstract

The invention discloses a high-strength and high-toughness metastable beta titanium alloy and a preparation method thereof. The Ti-Al-Mo-V-Cr-Zr metastable beta titanium alloy comprises the componentsof, in percentage by weight, 4.5%-5.5% of Al, 6.5%-9.0% of Mo, 1%-4% of V, 1.5%-4% of Cr, 1%-2.5% of Zr and the balance Ti and other inevitable impurities. According to the high-strength and high-toughness metastable beta titanium alloy and the preparation method thereof, after an alloy is subjected to smelting, hot rolling and heat treatment, good matching of strength and plasticity can be obtained; according to the high-strength and high-toughness metastable beta titanium alloy and the preparation method thereof, the content of the V element is further reduced to about 3.5%, and the cheap Cr element is added so that the cost can be reduced to a certain extent; meanwhile, a certain amount of the Cr and Mo elements are added to reinforce a beta matrix, so that the solid solution strengthening effect of the multi-component alloy is improved; and according to the high-strength and high-toughness metastable beta titanium alloy and the preparation method thereof, the yield strength of thealloy is improved to 1518 MPa, meanwhile, and the alloy also has the total elongation at break of 5.3%, so that the requirements of a new generation of high-strength and high-toughness titanium alloyare met.

Description

technical field [0001] The invention relates to a method for preparing a titanium alloy, in particular to a high-strength and high-toughness metastable beta titanium alloy and a preparation method thereof. Background technique [0002] Titanium alloy has the characteristics of low density, good corrosion resistance, excellent mechanical properties, and non-magnetic properties, and has been widely used in many fields. At the same time, the density of titanium alloy is generally 4.51g / cm 3 At only about 60% of steel, some high-strength titanium alloys exceed the strength of many alloyed structural steels. Therefore, the specific strength (strength / density) of titanium alloy is much greater than that of other metal structural materials, and parts with high unit strength, good rigidity and light weight can be produced, so it can be used as an important structural part in aerospace and other fields. [0003] For the current high-strength and tough titanium alloys, the Ti-10V-2F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/02C22F1/18B21B37/00B21B37/74
CPCC22C14/00C22F1/183C22C1/02B21B37/00B21B37/74
Inventor 张金钰张崇乐包翔云刘刚孙军
Owner XI AN JIAOTONG UNIV
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