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High-strength plastic titanium alloy for 20K ultralow temperature

An ultra-low temperature, titanium alloy technology, applied in the field of titanium alloy materials, can solve the problems of difficult formation of α-β phase region, failure to meet the use requirements, high production costs, etc., to achieve excellent strength and toughness matching, good low temperature plasticity, and improved The effect of intensity

Active Publication Date: 2022-03-15
WESTERN TITANIUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The alloy is adjusted through the process. Although its 20K low-temperature strength can reach more than 1400MPa, the low-temperature plasticity drops significantly, which cannot meet the requirements of use; and the alloy hardly contains β-stabilizing elements, and the hot-working plasticity is poor, and the α-β phase region is formed. Difficulties lead to long production cycle and high production cost
Although the CT20 titanium alloy developed by my country has good thermoplasticity, the tensile strength at 20K ultra-low temperature is generally around 1200MPa, and the elongation is ≥10%.

Method used

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  • High-strength plastic titanium alloy for 20K ultralow temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The 20K ultra-low temperature high-strength plastic titanium alloy of this embodiment is composed of the following components in mass percentage: Al 3.0%, Zr 3.0%, Mo 0.5%, V 1.0%, Nb 1.0%, O 0.05%, and the balance is Ti and unavoidable impurities.

[0027] The preparation process of the high-strength plastic titanium alloy for 20K ultra-low temperature in this example is as follows: use sponge titanium, sponge zirconium, Al bean, AlV55, AlMo65, AlNb60 according to the designed composition and mix the materials and press the electrode, and then in the vacuum consumable electric arc furnace The titanium alloy ingot was obtained by vacuum consumable arc melting for three times, and then the titanium alloy ingot was peeled off, the riser and the bottom of the ingot were removed, and then a fire upsetting was carried out on the press. The upsetting temperature was 1150°C, and the deformation amount was 160%, continue to carry out one-fire drawing on the press, the drawing t...

Embodiment 2

[0030] The 20K ultra-low temperature high-strength plastic titanium alloy of this embodiment is composed of the following components in mass percentage: Al3.5%, Zr2.0%, Mo2.0%, V0.5%, Nb0.8%, O0.05%, and the balance is Ti and unavoidable impurities.

[0031]The preparation process of the high-strength plastic titanium alloy for 20K ultra-low temperature in this example is as follows: use sponge titanium, sponge zirconium, Al bean, AlV55, AlMo65, AlNb60 according to the designed composition and mix the materials and press the electrode, and then in the vacuum consumable electric arc furnace The titanium alloy ingot was obtained by vacuum consumable arc melting for three times, and then the titanium alloy ingot was peeled off, the riser and the bottom of the ingot were removed, and four-fire upsetting was carried out on the press. The upsetting temperatures were 1150 ° C and 1050 ° C respectively. , 920°C, 920°C, the total heat deformation is 160%, and after the final slitting a...

Embodiment 3

[0034] The 20K ultra-low temperature high-strength plastic titanium alloy of this embodiment is composed of the following components in mass percentage: Al 4.0%, Zr 2.0%, Mo 0.7%, V 1.0%, Nb 0.5%, O 0.06%, and the balance is Ti and unavoidable impurities.

[0035] The preparation process of the high-strength plastic titanium alloy for 20K ultra-low temperature in this example is as follows: use sponge titanium, sponge zirconium, Al bean, AlV55, AlMo65, AlNb60 according to the designed composition and mix the materials and press the electrode, and then in the vacuum consumable electric arc furnace The titanium alloy ingot was obtained by vacuum consumable arc melting for three times, and then the titanium alloy ingot was peeled off, the riser and the bottom of the ingot were removed, and then a fire upsetting was carried out on the press. The upsetting temperature was 1150°C, and the deformation amount was 160%, continue to carry out one-fire drawing on the press, the drawing t...

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Abstract

The invention discloses a high-strength plastic titanium alloy for 20K ultralow temperature. The high-strength plastic titanium alloy is prepared from the following components in percentage by mass: 3.0 to 5.0 percent of Al, 1.0 to 3.0 percent of Zr, 0.5 to 2.0 percent of Mo, 0.5 to 2.5 percent of V, 0.2 to 1.0 percent of Nb, less than or equal to 0.13 percent of O and the balance of Ti and inevitable impurities. After the titanium alloy is subjected to simple annealing or double annealing, the tensile strength of the titanium alloy is larger than 1450 MPa under the 20 K ultralow temperature condition, and the percentage elongation after fracture is larger than 8%. The alpha phase is remarkably strengthened by controlling the Aleq of the titanium alloy, it is guaranteed that the titanium alloy has good ultralow-temperature strong plasticity matching, a better low-temperature solid solution strengthening effect is obtained by controlling Moeq, damage to the low-temperature plasticity of the titanium alloy is reduced, the strength of the titanium alloy under the 20K ultralow-temperature condition is jointly improved, and the good low-temperature plasticity is achieved; the method is suitable for preparing ultra-low temperature structural parts with complex structures.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy materials, and in particular relates to a high-strength plastic titanium alloy for 20K ultra-low temperature. Background technique [0002] Compared with low-temperature engineering materials such as stainless steel and magnesium-aluminum, titanium alloy has higher specific strength, better low-temperature toughness, low thermal conductivity and small expansion coefficient at low temperature, so it is used as a low-temperature engineering material in The aerospace field is more and more widely used, and the low-temperature application technology of titanium alloy has also become an important indicator to measure the space rocket technology of various countries. At present, the commonly used titanium alloy for 20K ultra-low temperature in China is mainly TA7ELI (Ti-5Al-2.5Sn), whose tensile strength at 20K ultra-low temperature can reach more than 1300MPa, and the elongation rate is ≥9%. Th...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22F1/18
CPCC22C14/00C22F1/183
Inventor 侯智敏康聪陆子川李维王云王兴张智贠鹏飞任利娜
Owner WESTERN TITANIUM TECH