Manufacturing of Ti3Al alloy & Ti2AlNb alloy blade

Ti2AlNb alloy and Ti3Al alloy are light-weight and high-temperature structural materials based on intermetallic compounds. This type of alloy has both good plasticity of metal and high temperature strength of ceramics as well as good oxidation resistance. The density of Ti2AlNb alloy and Ti3Al alloy is about 30% and 40% less than that of nickel-based superalloy respectively. It has great application prospects in thermal structural parts with long-term use at 650 ~ 750 ℃ and short-term use up to 900 ℃ in the aerospace field.

It is a high-tech material that is currently being developed at home and abroad. Through vacuum smelting, Ti2AlNb and Ti3Al alloy bars, rings, discs, plates and foils can be produced. The development and promotion of alloy preparation technology are in a leading position in the country. The comprehensive performance of these materials has reached the international advanced level involving multiple weapon models of China’s aviation, aerospace and weapons.

1.1 Alloy melting preparation technology
In terms of alloy smelting preparation, based on the existing domestic titanium alloy melting and smelting equipment, it adopts vacuum self-consumable and vacuum skull melting ,multi-combination smelting methods to form alloy ingot smelting preparation technology technologies for 100 kilograms level and one ton level. Through the control of raw material purity, electrode preparation, and smelting process, it can effectively overcome the adverse effects caused by the large difference in melting point and density of alloy elements, and achieve accurate and uniform alloy ingot composition and high purity.

1.2 Alloy deformation processing technology
In terms of hot forming, according to the ingot homogenization heat treatment-B2 phase zone temperature blanking-the basic process of secondary thermal deformation of a2 + B2 or a2 + B2 + 0 phase temperature, the deformation behavior and heat of the two alloys Carry out systematic research on various technological links of forming rods, plates, rings and die forgings.

In the research of hot forming of profiles, through reasonable heat preservation measures and the control of the amount of deformation and the rate of deformation, the alloy’s forming rate and deformation structure are significantly improved. The pre-treatment process before forming that has been explored has significantly improved the thermal deformation properties of the alloy. After innovative forming, the heat treatment process has fully guaranteed the structural properties of the profile. Based on this, the processing technology of alloy bars, plates, rings and die forgings has been established. Both alloys have developed rods with a diameter of 10 ~ 230 mm, hot-rolled plates with a width of up to 800 mm, and ring parts with an outer diameter greater than 700 mm, including ultra-high heights of 500 mm and diameters of 500 mm. Ring. Ti3Al alloy triangular rod die forgings for aero engines, Ti2AlNb alloy blade die forgings and connecting shaft rotor die forgings have also been successfully manufactured.

Edited By: Jessica WU;
Copyright: SIMUWU Vacuum Furnace

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