High-temperature titanium alloy and preparation method thereof

Abstract

The invention relates to a high-temperature titanium alloy and a preparation method thereof, specifically relates to a high-temperature titanium alloy resistant to the temperature being 650 DEG C or above and a preparation method of the high-temperature titanium alloy, and belongs to the technical field of titanium alloys. The high-temperature titanium alloy is composed of, by weight, 5% to 7% of Al, 3% to 5% of Sn, 5% to 9% of Zr, 0.2% to 0.6% of Mo, 0.5% to 1.5% of W, 0.5% to 1% of Nb, 0.2% to 0.34% of Si and the balance Ti and inevitable impurities. For the matching problem of the thermal stability, the creep property and the fatigue property of the alloy, the chemical components of the high-temperature titanium alloy are more reasonable, and the content of a primary phase and the size of a secondary phase can be better controlled. The high-temperature titanium alloy is prepared through a specific method, and the high-temperature titanium alloy is excellent in mechanical properties, such as strength, plasticity and the like, at the room temperature and the high temperature.

Description

technical field [0001] The invention relates to a high-temperature titanium alloy and a preparation method thereof, in particular to a high-temperature titanium alloy resistant to above 650°C and a preparation method thereof, belonging to the technical field of titanium alloys. Background technique [0002] High-temperature titanium alloys are used to manufacture important components in aero-engines and aircraft body structures due to their high specific strength, corrosion resistance, and high-temperature resistance. At present, the main high-temperature titanium alloys are developed on the basis of Ti-Al-Sn-Zr-Mo-Si series near-alpha titanium alloys. The maximum service temperature can reach 600 ° C. With the increase of the flight speed of new aerospace vehicles, The operating temperature of the aircraft shell and its engine components caused by the thermal effect of the gas can reach 650-750°C or even higher instantaneously. In order to meet the requirements of the rapid...

AI Technical Summary

Problems solved by technology

However, it needs to add a relatively large proportion of Ta tantalum (2% by mass), and the cost is high

In addition, the states of the materials in Examples 1-21 are casting + two times of rough forging + three times of precision forging + heat treatment, the process is extremely complicated, and the material cost is expensive

The existing technology lacks the performance data of cast state or cast + hot isostatic pressing state materials. The main reason is that the performance of materials in this state is extremely poor or poor, which must be improved by means of thermal processing and heat treatment. Only in this way can high-temperature titanium alloys meet the requirements. Component Performance Requirements

Example 22 of CN104018027A is a casting + heat treatment material, but its room temperature plasticity is very poor, and the room temperature elongation is only 4%

Images