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

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...

AI Technical Summary

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

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