Erbium-containing high-temperature titanium alloy and preparation process thereof

Abstract

The invention relates to an erbium-containing high-temperature titanium alloy and a preparation process thereof, belonging to the technical field of alloys. The alloy comprises the following components in percentage by weight: 6.0% of Al, 2.5% of Sn, 4% of Zr, 0.3% of Mo, 1% of Nb, 0.35% of Si, 0.1%-0.3% of Er and the balance of Ti, wherein impurity element O accounts for 0.088%-0.090%. The preparation process comprises the following steps of: forging a cast ingot at 100 DEG C-200 DEG C higher than an (alpha plus beta) / beta phase change point through a sectional heating method, cooling in air, further forging a forged piece at 50 DEG C-150 DEG C lower than the (alpha plus beta) / beta phase change point through the sectional heating method, controlling the deformation amount at 50%-60%, cooling in air, performing heat preservation on the forged piece at 30 DEG C-50 DEG C lower than the (alpha plus beta) / beta phase change point for 1 hour, cooling in air to room temperature, then performing the heat preservation at the temperature of 700 DEG C-750 DEG C for 2 hours, and cooling in the air to room temperature. The titanium alloy has excellent creep property and thermal stability.

Description

technical field [0001] The invention relates to a high-temperature titanium alloy containing rare earth elements and a preparation process thereof, belonging to the technical field of alloys. Background technique [0002] The development of aero-engines with large thrust-to-weight ratio and long life is one of the important goals of the aviation industry. Due to the advantages of low density and high specific strength, titanium and titanium alloys are widely used in aviation and other sectors. For example, the amount of titanium alloy in the F100 engine accounts for 25% of the total weight of the engine, 31% in the V2500 engine, and 39% in the F119 engine. High-temperature titanium alloys are mainly used in the manufacture of compressor plates, blades and casings of aircraft engines, so high-temperature titanium alloys must have good room temperature performance, high temperature strength, thermal stability, fatigue performance, fracture performance and creep performance. C...

AI Technical Summary

Problems solved by technology

When forged above the β transformation temperature, the alloy has good durability, creep resistance and fracture performance; while forged below the β transformation temperature, the above properties are poor

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