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High-temperature titanium alloy with high heat resistance and high thermal stabilization

A high thermal stability, high temperature titanium alloy technology, applied in the field of titanium-based alloys

Active Publication Date: 2008-01-16
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is reported that the IMI834 alloy has been used in the rotating parts such as the overall blisk of the aircraft engine, and Ti-1100 has also entered the application stage, while BT36 has not yet been reported.

Method used

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  • High-temperature titanium alloy with high heat resistance and high thermal stabilization
  • High-temperature titanium alloy with high heat resistance and high thermal stabilization
  • High-temperature titanium alloy with high heat resistance and high thermal stabilization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] According to the following formula: Al5.3wt-%; Sn5.0wt-%; Zr7.0wt-%; Si0.55wt-%; Nb0.4wt-%; Ta3.0wt-%; Ti is mixed with sponge titanium, pure aluminum, sponge zirconium and master alloy and then pressed into an electrode. The amount of Mo added is (wt-%): 0.4; 1.0; 2.0; 3.0. Put it into a vacuum consumable electrode electric arc furnace for vacuum melting. Obtain four ingots with different compositions, and then carry out thermal processing and heat treatment according to the following process conditions: Ф45 precision forging is made by a precision forging machine under the condition of 1150 ° C billet opening and 40 ° C heating at the α + β / β transformation point The rod is heated to 1000°C and rolled into a Φ21.5 rod with a rolling mill. The heat treatment system is solid solution at α+β / β transformation point at 30°C / 2h, air cooling, and aging at 700°C / 2h. After heat treatment, the four groups of samples were processed to test their tensile properties at room te...

Embodiment 2

[0052] According to the following formula: Al 6.1wt-%; Sn 3.0wt-%; Zr 2.5wt-%; Mo 0.2wt-%; Si0.25wt-%; Ta 0.3wt-%; Ti is uniformly mixed in the form of sponge titanium and master alloy, and then pressed to make square bars and welded to form electrodes. The addition of Nb is (wt-%): 0.2; 0.4; 0.7; 1.0. The above four electrodes with different compositions were put into a vacuum consumable electrode electric arc furnace and smelted three times, and smelted into four ingots with different Nb compositions. Carry out thermal processing and heat treatment by the processing condition of embodiment 1 again. Finally, four groups of samples were made to test their creep elongation after 100 hours at 600°C / 160MPa, and the curves shown in Figure 2 were obtained. It can be seen from Figure 2 that the creep resistance of the alloy begins to decrease when the Nb content in the titanium alloy increases above 0.4wt-%.

Embodiment 3

[0054] According to the following formula: Al 5.8wt-%; Sn 4.0wt-%; Zr 3.5wt-%; Mo 0.4wt-%; Si 0.35wt-%; Nb 0.4wt-%; The added amounts are (wt-%): 0; 0.4; 1.0; 1.5; 2.0; 2.5, and the balance is titanium and unavoidable impurities. Smelting, processing and heat treatment with the process of Example 1, and finally made six groups of samples to carry out the creep test as in Example 2, the results are shown in Figure 3; Next, measure the curve of oxidative gain over time within 200 hours, and the results are shown in Fig. 4(a) and (b) respectively. It can be seen from Figure 3 that Ta has a limited effect on the creep resistance of the alloy in a relatively wide range, but it is reflected in Figure 4 that its effect on improving the oxidation resistance of the alloy is obvious.

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Abstract

The invention provides a novel high-temperature Ti alloy with high heat resistance and high heat stability. The alloy contains eutectic Nb, Ta and Mo elements. Based on the appropriate proportion of these three elements, the alloy is superior in high resistance and stability to heat and good antioxidant effect. The alloy contains (by weight) Al 5.0-6.3 percent, Sn 3.0-5.0 percent, Zr 2.5-7.0 percent, Mo 0.2-1.5 percent, Si 0.20-0.55 percent, Nb 0.2-1.0 percent, Ta 0.2-3.0 percent, C 0.01-0.09 percent, and Ti and other inevitable impurities in balance. The alloy is an ideal alternative material for high-temperature parts of aircraft engine, such as wheel disk, drum barrel, barrel shaft and blade.

Description

Technical field: [0001] The invention belongs to the technical field of titanium-based alloys, and specifically relates to a titanium alloy that is mainly used for long-term use at temperatures below 600°C on aero-engines and for short-term use on other spacecraft at temperatures above 600°C. base alloy. Background technique [0002] In order to meet the design requirements of reducing weight and increasing the thrust-to-weight ratio, aero-engines need to use titanium alloy materials with high specific strength as much as possible. In recent years, the use of titanium alloys on domestic and foreign aircraft, especially advanced military aircraft, has shown a significant increase. It can be said that the amount and level of titanium alloy usage has become an important indicator to measure the advanced level of domestic and foreign aviation technology and aircraft performance. [0003] However, titanium alloys have encountered great obstacles in the development process of in...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C1/03C22F1/18
Inventor 王清江刘建荣杨锐魏寿庸刘羽寅陈占乾王鼎春高硕
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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