A low-temperature high-strength fatigue-resistant titanium-aluminum-niobium alloy

A fatigue-resistant, titanium-aluminum-niobium technology, applied in the field of titanium alloy materials, can solve the problems of poor low-temperature performance, lower elastic modulus, and low room temperature plasticity, achieve low-temperature strong plasticity and excellent fatigue performance, improve low-temperature plasticity, and sensitive Sexually low effect

Active Publication Date: 2015-10-07
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The γ-TiAl master alloy is also used at 77K low temperature, but the material contains more than 16% aluminum, relying on the alloyed γ phase to improve the low temperature strength of the material, and the plasticity at room temperature is very low, and it is easy to crack during hot working
The purpose of adding 7% Nb element to the Ti-6Al-7Nb alloy researched in the field of biomedicine is to reduce the elastic modulus of the material, and the purpose of adding 6% Al element is to ensure the room temperature strength of the material and its low temperature performance. Difference

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The nominal composition of the titanium-aluminum-niobium alloy in this embodiment is Ti-2.5Al-15Nb, that is, 2.5% by weight of Al, 15% of Nb, and the balance is titanium and unavoidable impurities.

[0026] The preparation method of the titanium-aluminum-niobium alloy in this embodiment is as follows: the ingredients are proportioned according to the nominal composition Ti-2.5Al-15Nb, and the raw materials are Ti-50Nb master alloy, aluminum beans and zero-grade sponge titanium. After the raw materials are mixed evenly, the electrodes are pressed, and the alloy ingots are obtained by smelting three times in a vacuum consumable electric arc furnace. After the alloy ingot is peeled off and the riser and tail end are cut off, the billet is opened and drawn twice at 1200°C on the free forging equipment, and the deformation of the fire is 65%, and finally it is carried out at 950°C on the free forging equipment Two fires and one drawing and forging, the deformation of the two...

Embodiment 2

[0029] The nominal composition of the titanium-aluminum-niobium alloy in this embodiment is Ti-2Al-16Nb, that is, by weight percentage, it is Al2%, Nb16%, and the balance is titanium and unavoidable impurities.

[0030] The preparation method of the titanium-aluminum-niobium alloy in this embodiment is as follows: the ingredients are proportioned according to the nominal composition Ti-2Al-16Nb, and the raw materials are Ti-50Nb master alloy, aluminum beans and zero-grade sponge titanium. After the raw materials are mixed evenly, the electrodes are pressed, and the alloy ingots are obtained by smelting three times in a vacuum consumable electric arc furnace. After the alloy ingot is peeled off and the riser and tail end are cut off, the billet is opened and drawn twice at 1250°C on the free forging equipment, and the deformation of the fire is 60%, and finally it is carried out at 980°C on the free forging equipment. Two fires and one drawing and forging, the deformation of th...

Embodiment 3

[0033] The nominal composition of the titanium-aluminum-niobium alloy in this embodiment is Ti-3Al-14Nb, that is, Al3% by weight percentage, Nb14%, and the balance is titanium and unavoidable impurities.

[0034] The preparation method of the titanium-aluminum-niobium alloy in this embodiment is as follows: the ingredients are proportioned according to the nominal composition Ti-3Al-14Nb, and the raw materials are Ti-50Nb master alloy, aluminum beans and zero-grade sponge titanium. After the raw materials are mixed evenly, the electrodes are pressed, and the alloy ingots are obtained by smelting three times in a vacuum consumable electric arc furnace. After the alloy ingot is peeled off and the riser and tail end are cut off, the billet is opened and drawn twice at 1150°C on the free forging equipment, and the deformation of the fire is 63%, and finally it is carried out at 900°C on the free forging equipment. Two fires and one drawing and forging, the deformation of the fire ...

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Abstract

The invention provides a low-temperature, high-strength and fatigue-resistant titanium niobium aluminum alloy, which is composed of the following components in percentage by weight: 2.0-3.5% of Al, 12-16% of Nb and the balance of Ti and unavoidable impurities. Under a temperature condition of 77 K, the mechanical properties of the titanium niobium aluminum alloy provided by the invention meet the following conditions: RM is equal to 1300-1400 MPa, Rp 0.2 is not smaller than 1200 MPa, A50 is not smaller than 18%, the high cycle fatigue strength of the alloy is not smaller than1200 MPa under the conditions that the temperature is 77 K and the cycle number N is 150, and the titanium niobium aluminum alloy has better match of strength and plasticity than that of a traditional low-temperature titanium alloy and meets related requirements of medium and low temperature components in high-performance rockets, spacecrafts and spaceships.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy materials, and in particular relates to a low-temperature, high-strength, fatigue-resistant titanium-aluminum-niobium alloy. Background technique [0002] The key to the safe use of titanium alloy parts under low temperature conditions in hydraulic vessels and conduit systems is to prevent the embrittlement of titanium alloys when the temperature drops, so α and near-α titanium alloys with low plastic-brittle transition temperatures are often used as low-temperature pressure-resistant Engineering Materials. Although α and near α titanium alloys have good cold forming and weldability, due to their low degree of alloying, single microstructure, low temperature yield strength and fatigue properties are much lower than α + β titanium alloys, resulting in limited loading capacity of pressure vessels and safety. The coefficient is low. In order to ensure the safe service life of liquid helium t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00
Inventor 杜宇葛鹏杨海瑛刘伟洪权毛小南
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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