3D integral forging method for preparing high-alloyed alloy disc forgings

Abstract

The invention relates to a 3D overall forging method for manufacturing a high-alloying alloy-disc-shaped forging piece. The 3D overall forging method includes the following steps: preparing an orientation ingot blank, conducting high-temperature homogenization treatment, cogging the ingot blank, conducting shaping and forging to form a square, sequentially conducting forging in the X direction, the Y direction and the Z direction, conducting overall forging to form a cylinder, conducting forging until the alloy-disc-shaped forging piece in the needed size is obtained, and conducting testing. The high-alloying alloy-disc-shaped forging piece manufactured with the 3D overall forging method has even and tiny microstructures. The 3D overall forging method is short in production period, convenient to control, low in cost and suitable for producing the high-alloying alloy-disc-shaped forging piece difficult to deform, large in size, high in cleanness and even in structure a mass mode.

Description

technical field [0001] The invention relates to a forging method, in particular to a forging method for preparing a high-alloyed hard-to-deform alloy disc-shaped forging. Background technique [0002] Disc forgings are one of the most important hot-end parts of aero-engines and gas turbines. Since disc forgings bear high loads in high-temperature working environments, and they also transmit torque while rotating at high speeds, the working conditions are very Harsh, so the requirements for material properties are extremely high. [0003] At present, there are two main processes for preparing disc forgings: conventional casting and forging process (Cast / Wrought, C / W) and powder metallurgy process (PowderMetallurgy, P / M). [0004] The conventional casting and forging process (Cast / Wrought, C / W) is adopted. This process uses vacuum induction melting + vacuum arc remelting dual process to prepare ingots. After homogenization and annealing, the ingots are forged in the axial dir...

AI Technical Summary

Problems solved by technology

This traditional forging method has limitations in the following aspects: First, it is only suitable for alloys with relatively low alloying. The center segregation of the ingot prepared by the conventional double-link process is more serious, the size of the precipitate is larger, the deformation resistance of the ingot is increased, and the thermal processing window is reduced, which makes the ingot unable to complete forging and opening; The billet is a process in which the billet is elongated by partial sequential forging and deformation of the forging equipment. This forging process is likely to cause the problem of poor structure uniformity; There are cold die structure and deformation dead zone on the end face, which is not suitable for the manufacture of disc forgings used in advanced aero-engines

This technology can be used to prepare large-size, high-purity, low-segregation directionally solidified high-alloyed high-temperature alloy ingots that are difficult to deform. The directionally solidified ingots have good thermal processing performance, and the ingot forging can be completed by hydraulic forging equipment. The process overcomes the problem that the traditional deformation process cannot prepare disc-shaped forgings with a higher alloying level (use temperature exceeds 650 ° C), and at the same time solves the original particle boundary (PPB) and large-size inclusions in the production of disc-shaped forgings by powder metallurgy and expensive issues

[0007] However, disc forgings prepared by vacuum / gas shielded electroslag remelting continuous directional solidification ingots by conventional forging methods cannot meet the requirements for microstructure uniformity of disc forgings for advanced aero-engines

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