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High-temperature titanium alloy rod with excellent comprehensive performance and preparation process thereof

A high-temperature titanium alloy and alloy technology, applied in the field of titanium-based alloys, can solve the problems of unstable alloy surface, unstable structure, and increased probability of brittle phase precipitation, and achieve excellent high-temperature comprehensive performance, excellent service performance, and broad application prospects. Effect

Inactive Publication Date: 2016-10-26
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From the current point of view, the thermal strength of high-temperature titanium alloys basically meets the standard, but the thermal stability cannot meet the requirements well under normal circumstances. It is manifested that the performance of titanium alloys is significantly reduced during the use of high-temperature environments. The reasons are: first, The high alloying adopted in pursuit of strength increases the probability of brittle phase precipitation after the alloy has been working for a long time, resulting in unstable structure; second, the infiltration of oxygen at high temperature forms an oxygen-enriched layer on the surface of the alloy, which leads to unstable

Method used

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  • High-temperature titanium alloy rod with excellent comprehensive performance and preparation process thereof
  • High-temperature titanium alloy rod with excellent comprehensive performance and preparation process thereof
  • High-temperature titanium alloy rod with excellent comprehensive performance and preparation process thereof

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preparation example Construction

[0024] Preparation of high-temperature titanium alloys: raw materials are sponge titanium, high-purity aluminum, sponge zirconium, silicon particles, and Ti-Nb, Ti-Sn, Ti-Ta, Al-Mo, Al-Er master alloys, proportioned and mixed according to the ingredients Evenly clad with alloy, and pressed into electrodes on a press. The electrode is smelted on a vacuum consumable electrode electric arc furnace, and the titanium alloy ingot is obtained by three times of remelting, and the ingot is descaled, and the head and tail are removed.

[0025] The alloy ingot structure after smelting is shown in the attached figure 1 , it can be seen that the obtained ingot structure is the typical Widmanstatten structure in titanium alloy, the grain size is large, and a large bundle is formed in the original β grain, and there are many α sheets parallel to each other in the same bundle. form the same orientation.

[0026] In order to determine the alloy forging process, the present invention adopts t...

Embodiment 1

[0029] Alloy raw materials are prepared according to the nominal composition Ti-6.0Al-3.0Sn-5.0Zr-0.5Mo-1.0Ta-0.4Si-0.2Er (weight percent, %), and the raw materials use sponge titanium, high-purity aluminum, sponge zirconium, silicon particles and Ti-Nb, Ti-Sn, Ti-Ta, Al-Mo, Al-Er master alloys are proportioned according to the ingredients and mixed evenly to clad the alloy, and pressed on a press to form electrodes. The electrode is smelted on a vacuum consumable electrode electric arc furnace, and three times of remelting are carried out to obtain titanium alloy ingots. After the ingots are peeled off, glass protective lubricants are applied to prevent the alloys from being oxidized at high temperatures. Open billet forging at 1150°C. After open billet forging, a square bar with a side length of 50 mm is obtained. Then, it is subjected to multiple fire pier drawing at 1000 °C to refine the structure. Finally, it is precision forged into a round bar with a diameter of Φ30 mm. ...

Embodiment 2

[0036] Alloy raw materials are prepared according to the nominal composition Ti-6.0Al-3.0Sn-5.0Zr-0.5Mo-1.0Ta-0.4Si-0.2Er (weight percent, %), and the raw materials use sponge titanium, high-purity aluminum, sponge zirconium, silicon particles and Ti-Nb, Ti-Sn, Ti-Ta, Al-Mo, Al-Er master alloys are proportioned according to the ingredients and mixed evenly to clad the alloy, and pressed on a press to form electrodes. The electrode is smelted on a vacuum consumable electrode electric arc furnace, and three times of remelting are carried out to obtain titanium alloy ingots. After the ingots are peeled off, glass protective lubricants are applied to prevent the alloys from being oxidized at high temperatures. Open billet forging at 1150°C. After open billet forging, a square bar with a side length of 50 mm is obtained. Then, multiple fire pier drawing is carried out at 1050 °C to refine the structure. Finally, a round bar with a diameter of Φ30 mm is precision forged.

[0037] The ...

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Abstract

The invention discloses a high-temperature titanium alloy rod with excellent comprehensive performance and a preparation process thereof, and belongs to the technical field of titanium-based alloys. The high-temperature titanium alloy rod is prepared from the following alloy components in percentage by weight: 5.4 to 5.6 percent of Al, 3.0 to 3.3 percent of Sn, 5.3 to 5.5 percent of Zr, 0.5 to 0.6 percent of Mo, 0.8 to 1 percent of Nb, 0.4 to 0.5 percent of Si, 0.9 to 1.0 percent of Ta, 0.1 to 0.3 percent of Er and the balance of Ti and unavoidable impurities. The alloy rod is prepared by a forging process; the cogging temperature of forging is 1,100 to 1,150 DEG C, and the final precision forging temperature is 970 to 1,000 DEG C and 1,000 to 1,050 DEG C correspondingly. The invention provides a novel high-temperature titanium alloy with excellent comprehensive performance at room temperature and high temperature; the alloy shows extremely high service performance, and the service temperature of the high-temperature titanium alloy is further increased, and the high-temperature titanium alloy rod has a wide application prospect in the engineering field.

Description

technical field [0001] The invention belongs to the technical field of titanium-based alloys, and in particular relates to a titanium-based alloy that has the potential to be applied to aero-engines and can be used at 650°C. It is characterized by excellent comprehensive properties at room temperature and high temperature, especially room temperature toughness and high temperature strength. Background technique [0002] High-temperature titanium alloy has excellent thermal strength, low density and good corrosion resistance, and is mostly used in the aerospace field to manufacture pressure plates and casings of aero-engines. The service temperature of high-temperature titanium alloys has developed from the initial 400°C to 600°C. Foreign 600°C high-temperature titanium alloys such as IMI834 in the UK and Ti-1100 in the United States have been used in aero engines, which have significantly improved the performance of the engines. Russia's BT36 is in the stage of applied rese...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C1/03C22F1/18
CPCC22C14/00C22C1/03C22F1/183
Inventor 李伯龙王振强王同波
Owner BEIJING UNIV OF TECH
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