Manufacturing method of double-alloy double-structure titanium alloy blisk

Abstract

The invention discloses a manufacturing method of a double-alloy double-structure titanium alloy blisk. The method comprises the steps that firstly, a Ti60 titanium alloy hub forging blank of a mesh basket fine grain structure is manufactured through a quasi-beta forging method, and a hub rough machining blank is obtained through machining; secondly, a Ti2AlNb titanium alloy blade blank is prepared on the hub rough machining blank through a laser powder feeding additive manufacturing method; and thirdly, local gradient isothermal forging deformation is conducted on a double-alloy blisk prefabricated blank, the defects of air holes, incomplete fusion and the like in the laser additive manufacturing blade blank can be effectively overcome, and a precipitated phase and a microstructure of a sedimentary blade are refined. Meanwhile, uniform diffusion of alloy elements at the interface of the hub rough machining blank and the blade blank is facilitated, and the interface bonding strength between the hub rough machining blank and the blade blank is enhanced. In addition, through local gradient deformation of the blisk prefabricated blank, gradual transition between two remarkably-different structures at the bonding interface of the Ti60 titanium alloy hub rough machining blank of the mesh basket structure and the Ti2AlNb titanium alloy blade blank of an equiaxed structure can be achieved, and the material and structure states of the blade and a disc body better adapt to the actual working condition of the blisk.

Description

technical field [0001] The invention relates to a manufacturing method of a double-alloy double-structure titanium alloy blisk, which belongs to the technical field of additive manufacturing and relates to the improvement of the forming process of the double-alloy titanium alloy blisk. Background technique [0002] Titanium alloy blisk is a typical lightweight and efficient overall structure of high thrust-to-weight ratio aero-engines, and is widely used in rotor component systems such as compressors, fans, and turbines. Different areas of the blisk have different working environments and technical requirements. The blades mainly emphasize good high-cycle fatigue performance, thermal stability and high-temperature durability due to the high working temperature and the centrifugal force and vibration load. The hub part bears a large load, mainly emphasizing high temperature creep and low cycle fatigue performance. Therefore, in order to improve the weight reduction effect of...

AI Technical Summary

Problems solved by technology

Although this method can eliminate the characteristics of uneven, insufficient, and defective diffusion between different materials in the traditional diffusion welding process, defects such as pores and lack of fusion are likely to exist inside the blade blanks of additive manufacturing, and laser powder feeding or electron beam melting are used The titanium alloy blade blank produced by wire additive manufacturing is a coarse Widmanstatten structure, which reduces the service life of the overall blisk

In addition, the joint interface of the double alloy blisk prepared by the above process is the weakest link of the disc body, and there is a sudden change in the structure at the joint, which is easy to form a crack source during the working process and cause loosening and fracture, which seriously affects the safety of the engine sex and reliability

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