A low-temperature high-strength two-phase titanium alloy

A titanium alloy, high-strength technology, applied in the field of low-temperature high-strength two-phase titanium alloy, can solve the problems of high cold work hardening rate, low plasticity, alloy low-temperature performance sensitive to oxygen content, etc., and achieve excellent strong-plastic matching effect

Active Publication Date: 2015-11-11
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Countries such as Japan, the United States and the former Soviet Union have regulated the safe use temperature of different types of low-temperature titanium alloys. The α-type titanium alloys TA7ELI, AT2, OT4, and α+β-type titanium alloy TC4ELI can all be used safely at 20K, but TA7 And TC4 alloy composition must be controlled to ultra-low gap level, because the increase of the content of interstitial elements such as O, C, N will greatly reduce the low temperature fracture toughness and plasticity of titanium alloy, resulting in the low temperature performance of the alloy is sensitive to oxygen content
The brittleness of the existing American low-temperature titanium alloy TA7 alloy increases due to the addition of Sn elements, and the TC4 alloy has a high cold work hardening rate at room temperature.
Russian α-type titanium alloys AT2 and OT4 do not contain Al elements, although this series of alloys have high strength and satisfactory impact toughness at low temperatures, and these alloys are less sensitive to oxygen content, but the series of alloys at 20K When the plasticity is low, only 11% to 14%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The nominal composition of the titanium alloy in this embodiment is Ti-1.5Al-5Nb-1.2Mo, that is, Al1.5%, Nb5%, Mo1.2% by weight percentage, and the balance is titanium and unavoidable impurities.

[0023] The preparation method of the titanium alloy in this example is as follows: batching according to the nominal composition Ti-1.5Al-5Nb-1.2Mo, the raw materials are Al-60Mo master alloy, 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 forging is carried out on the free forging equipment at 1100°C, and then repeated upsetting and drawing forging is carried out at the temperature of 900°C and the deformation amount of each pass is 60%. Finally, multiple passes of hot rolling were carried out at a...

Embodiment 2

[0026] The nominal composition of the titanium alloy in this embodiment is Ti-1.5Al-4.5Nb-3Mo, that is, Al1.5%, Nb4.5%, Mo3% by weight percentage, and the balance is titanium and unavoidable impurities.

[0027] The preparation method of the titanium alloy in this example is as follows: batching according to the nominal composition Ti-1.5Al-4.5Nb-3Mo, the raw materials are Al-55Mo master alloy, 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, it is forged on a free forging equipment at 1080°C, and then repeatedly upsetting and drawing forging is carried out at a temperature of 9298K and a deformation of 55%. The temperature is 840°C, and the multi-pass hot rolling is carried out under the condition that the pass ...

Embodiment 3

[0030] The nominal composition of the titanium alloy in this embodiment is Ti-2.5Al-5.5Nb-1.7Mo, that is, Al2.5%, Nb5.5%, Mo1.7% by weight percentage, and the balance is titanium and unavoidable impurities .

[0031]The preparation method of the titanium alloy in this example is as follows: batching according to the nominal composition Ti-2.5Al-5.5Nb-1.7Mo, raw materials are Al-60Mo master alloy, Ti-46Nb 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, it is forged on a free forging equipment at 1100°C, and then repeatedly upsetting and drawing forging is carried out at a temperature of 880°C and a deformation amount of 50%. Under the conditions of a temperature of 860°C and a pass deformation of 60%, hot rolling was ca...

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Abstract

The invention provides a low-temperature-resistant and high-strength two-phase titanium alloy. The low-temperature-resistant and high-strength two-phase titanium alloy comprises the following components in percentage by mass: 1.5-3.5% of Al, 4.5-6.5% of Nb, 1.2-3% of Mo and the balance of titanium and unavoidable impurities. At a low temperature of 20K, the low-temperature-resistant and high-strength two-phase titanium alloy has mechanical properties as follows: Rm is greater than or equal to 1400MPa, Rp0.2 is greater than or equal to 1100MPa, and A is greater than or equal to 20%; compared with the conventional low-temperature-resistant titanium alloy, the low-temperature-resistant and high-strength two-phase titanium alloy has more excellent strength-plasticity matching, and can meet relevant requirements on low-temperature-resistant components of high-performance rocket, spacecrafts and spaceships.

Description

technical field [0001] The invention belongs to the technical field of titanium alloys, in particular to a low-temperature high-strength two-phase titanium alloy. Background technique [0002] There is no aerospace rocket that does not use titanium and its alloys, such as engine hanger components, piping systems, cryogenic liquid storage tanks, liquid hydrogen delivery pump impellers and brackets, etc. It can be said that titanium and its alloys are always subject to aerospace and The concern of rocket technology and equipment developers. In order to meet the requirements of high-performance rockets, spacecraft and spaceships, the life and safety of low-temperature components, the titanium alloy used should not only have high low-temperature strong-plasticity matching, but also have good room-temperature plasticity to facilitate processing. [0003] Considering these requirements comprehensively, α-type and near-α-type alloys with better cold working performance at room tem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00
Inventor 葛鹏杜宇杨海瑛刘伟
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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