A titanium-aluminum-based alloy with excellent high-temperature creep performance and casting performance

Abstract

The invention introduces a titanium-aluminum-based alloy with excellent high-temperature creep property and casting performance and belongs to gamma-TiAl alloy. The alloy is composed of the following components: 44.0-48.0at% of Al, 1.0-3.0at% of Nb, 0.1-3.0at% of Ni, one or two of Si and C and the balance of Ti and impurity elements, wherein the amount of Si is 0-0.8at%, the amount of C is 0-0.6at%, and the total amount of Si and C is 0.1-0.9at%. The titanium-aluminum-based alloy introduced by the invention has good high-temperature creep property and good casting fluidity, and is suitable for casting thin-walled parts; at the temperature of 850-950 DEG C, the surface of the titanium-aluminum-based alloy is not subjected to chemical treatment, thermal spraying, ion implantation and the like to improve the oxidation resistance of a material; and the titanium-aluminum-based alloy is especially suitable for casting gasoline engine turbocharger turbine rotor which works at the temperaturebelow 900-950 DEG C.

Description

[0001] technical field [0002] The invention relates to a technology in the field of high-temperature alloys, in particular to a titanium-aluminum-based alloy with excellent high-temperature creep performance and casting performance. Background technique [0003] With the continuous improvement of the performance of engines such as aviation, aerospace, automobiles, and ships, higher requirements are put forward for the performance of high-temperature materials, that is, higher strength, oxidation resistance, and lighter density. γ-TiAl-based alloy materials have the advantages of good high temperature strength, creep resistance and oxidation resistance, etc., and are developing into a new generation of aero-engine materials, which can be used to manufacture compressors, gas turbine blades, compressor stator windshields, stator machines Blocks and other large-scale casting and forging parts with complex shapes can partially replace bulky nickel-based superalloys, which ...

AI Technical Summary

Problems solved by technology

[0010] Low-Nb (usually 1-3at%Nb) titanium-aluminum alloy materials have poor high-temperature creep properties, and when the temperature is used for a long time at 850°C-950°C, the surface of the material is severely oxidized. Therefore, low-Nb titanium-aluminum alloys are usually not suitable Preparation of parts that are used for a long time in a high temperature environment of 850-950°C

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