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High-strength and high-plasticity metastable-state beta-type titanium alloy and preparation method thereof

A metastable, high plasticity technology, applied in metal processing equipment, improving energy efficiency, improving process efficiency, etc., can solve the problems of limiting the application of titanium alloys for structures, loss of plasticity, etc.

Active Publication Date: 2021-12-31
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the yield strength of existing titanium alloys is generally lower than 1300MPa, and the plasticity will be severely lost as the strength increases, which severely limits the application and development of structural titanium alloys under high-strength and high-plastic service conditions.

Method used

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  • High-strength and high-plasticity metastable-state beta-type titanium alloy and preparation method thereof
  • High-strength and high-plasticity metastable-state beta-type titanium alloy and preparation method thereof
  • High-strength and high-plasticity metastable-state beta-type titanium alloy and preparation method thereof

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preparation example Construction

[0036] The preparation method of the above-mentioned Ti-V-Al-Zr-Cr metastable β-type titanium alloy comprises the following steps:

[0037] Step 1. Select the corresponding raw materials according to the composition design to carry out alloy batching and mix evenly, and then use the cold crucible suspension melting method (CCLM) to melt the alloy;

[0038] During the smelting process, argon gas is introduced, the smelting current is 350-400A, and the current frequency is 20-25KHz. The raw materials are loaded into the furnace in bulk and smelted by suspension for five times.

[0039] Step 2. After the ingot is stripped and the riser is cut, free forging is carried out on the hammer to obtain the forged Ti-V-Al-Zr-Cr metastable β-type titanium alloy ingot, and then the alloy ingot is homogenized at high temperature deal with;

[0040] Free forging includes open blank forging and high temperature forging.

[0041] The blanking temperature for blank forging is 1000-1100°C, the ho...

Embodiment 1

[0046] A method for preparing a Ti-V-Al-Zr-Cr metastable β-type titanium alloy, comprising the following steps:

[0047] Step 1. Weigh the following raw materials by weight percentage:

[0048] 5.15-5.30% Al, 4.45-4.60% Zr, 2.65-2.80% Cr and 11.3-11.7% V, and the balance is Ti and unavoidable impurities.

[0049] Step 2. Mix the above raw materials evenly and load them into the furnace in bulk, then carry out five times of suspension smelting. Before each smelting, the ingot is turned upside down and loaded into the furnace. The smelting process is carried out in a high-purity argon environment. 20KHz.

[0050] Step 3: Cut off the riser from the ingot obtained in Step 2, and then perform billet forging and high-temperature forging to obtain a Ti-V-Al-Zr-Cr metastable β-type titanium alloy.

[0051] The blank forging temperature is 1100°C, and the holding time is 90 minutes. The blank is opened with three piers and three pulls, and the deformation is not less than 50%. The t...

Embodiment 2

[0056] A method for preparing a Ti-V-Al-Zr-Cr metastable β-type titanium alloy, comprising the following steps:

[0057] Step 1, prepare the following raw materials by weight percentage:

[0058] 11.3-11.7% of V, 5.15-5.30% of Al, 4.45-4.60% of Zr and 2.65-2.80% of Cr, and the balance is Ti and unavoidable impurities.

[0059] Step 2. Mix the above raw materials evenly and load them into the furnace in bulk, then carry out five times of suspension melting. Before each melting, the ingot is turned upside down and loaded into the furnace. The melting process is carried out in a high-purity argon environment. The melting current is 380A, and the current frequency is 22KHz.

[0060] Step 3: Cut off the riser from the ingot obtained in Step 2, and then perform billet forging and high-temperature forging to obtain a Ti-V-Al-Zr-Cr metastable β-type titanium alloy.

[0061] The blank forging temperature is 1050°C, and the holding time is 90 minutes. The blank is opened with three pi...

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Abstract

The invention discloses a high-strength and high-plasticity metastable-state beta-type titanium alloy and a preparation method thereof. The high-strength and high-plasticity metastable-state beta-type titanium alloy comprises the following components in percentage by weight: 11.0-12.0% of V, 5.0-6.0% of Al, 4.0-5.0% of Zr, 2.0-3.0% of Cr and the balance of Ti. After the alloy is subjected to conventional single-aging heat treatment, a secondary alpha s phase with the average size of about 10 nm can be obtained. In addition, a multi-level structure comprising a primary alpha phase and the secondary alpha s phase is constructed through two-phase region solid solution and aging heat treatment. Al and Zr elements are compounded to strengthen the alpha phase, and a V element is added to improve the plasticity of the alloy while a common beta strengthening element Cr is added to obtain extremely high strength. The yield strength of an existing metastable-state beta-type titanium alloy is improved to 1642 MPa which is unprecedented, the tensile strength is improved to 1726 MPa, and meanwhile, the ductility is 5%. Based on the characteristics, the alloy has great competitive advantages in high-strength and high-plasticity titanium alloys.

Description

technical field [0001] The invention belongs to the technical field of high-performance alloy materials, in particular to a high-strength and high-plastic metastable β-type titanium alloy and a preparation method thereof. Background technique [0002] The ideal metal material is one that maintains high strength while still maintaining a large uniform elongation. However, it is well known that the two key properties of strength and plasticity are contradictory, making the development of a new generation of ultra-high-strength alloys with excellent plasticity has always been one of the biggest challenges in the material science community. Based on the concept of low-carbon and sustainable development, lightweight metal materials with low cost and high specific strength have become hot. Among them, the metastable β-titanium alloy is widely used in aerospace, petrochemical and other fields due to its high specific strength and excellent corrosion resistance. [0003] The stren...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C1/02C22F1/18B21J5/00
CPCC22C14/00C22C1/02C22F1/183C22F1/002B21J5/002Y02P10/25
Inventor 张金钰包翔云张东东刘刚孙军
Owner XI AN JIAOTONG UNIV
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