Large-size difficult-to-deform nickel-based superalloy cast ingot and preparation method thereof

Abstract

The invention discloses a large-size difficult-to-deform nickel-based superalloy cast ingot and a preparation method thereof. The preparation method comprises the following steps: triple smelting: performing triple smelting on a superalloy raw material through vacuum induction smelting, protective atmosphere electroslag remelting and vacuum consumable remelting to obtain a consumable ingot; homogenization treatment: carrying out multi-section homogenization treatment, and carrying out heat preservation on the consumable ingot; raising the temperature and keeping the temperature; raising the temperature and keeping the temperature; and heating, preserving heat and then cooling to obtain the large-size difficult-to-deform nickel-based superalloy cast ingot. The invention further discloses the large-size difficult-to-deform nickel-based superalloy cast ingot prepared by the method. Through the method provided by the invention, the difficult-to-deform nickel-based superalloy with the specification of phi 660 mm can be stably prepared, the prepared alloy ingot is low in segregation, the cracking problem of a large-size ingot is solved, the metallurgical quality of the difficult-to-deform superalloy is improved, the thermoplasticity is high, the later forging cogging cracking is further reduced, and the product quality is improved. And a foundation is laid for preparing large-size bars and large-size disc forgings.

Description

technical field [0001] The application relates to the technical field of high-temperature alloys, and more specifically, it relates to a large-scale hard-to-deform nickel-based superalloy ingot and a preparation method thereof. Background technique [0002] The turbine disk is the key hot end part of the engine, its metallurgical quality and performance level play a decisive role in improving the reliability, safety life and performance of the engine. With the development of high thrust-to-weight / power-to-weight ratio engines, higher requirements are put forward for the temperature bearing capacity, high temperature strength, long life, toughness, fatigue performance, reliability and durability of turbine disks. The degree of alloying of deformed superalloys is getting higher and higher, the content of γ′ phase is getting higher and higher, and the purity is getting higher and higher; at the same time, the diameter of the turbine disk is also increasing, requiring large-scal...

AI Technical Summary

Problems solved by technology

Due to the small size of the consumable ingot, it is necessary to prepare large-size bars and large-size disc forgings. There have always been complex processes, easy cracking, high dendrite segregation, more impurities, and high costs, which have affected the popularization and application of this alloy.

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