Triple smelting process of difficult-to-deform nickel-based high-temperature alloy GH4151

Abstract

The invention discloses a triple smelting process of a difficult-to-deform nickel-based high-temperature alloy GH 4151. The triple smelting process comprises the following steps of: firstly, weighingraw materials of the GH4151 according to the component requirements of the GH4151; then, sequentially carrying out vacuum induction furnace smelting, protective atmosphere electroslag remelting smelting and vacuum consumable remelting smelting according to set process parameters; carrying out stress relief annealing treatment on an electrode and a consumable ingot in a triple smelting process; andfinally, stably preparing a GH4151 consumable ingot with the maximum size of phi 508mm. According to the GH4151 consumable ingot obtained by the triple smelting process disclosed by the invention, the cracking problem of the large-size consumable ingot is solved; the dendritic segregation degree of the prepared phi 508mm consumable ingot is relatively low and the content of sulfur and impuritiesis also greatly reduced; and the metallurgical quality of the GH4151 alloy is improved and a foundation is laid for preparing large-specification bars and large-size disc forged pieces of the GH4151 alloy.

Description

technical field [0001] The invention belongs to the technical field of thermal processing, and in particular relates to a triple smelting process of a difficult-to-deform nickel-based superalloy GH4151 alloy. Background technique [0002] The turbine disk is a key hot-end part of an aircraft engine, and its metallurgical quality and performance level play a decisive role in improving the reliability, safety life and performance of the engine and aircraft. 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-...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems existing in the existing technology, this patent provides a triple smelting process of the hard-to-deform nickel-based superalloy GH4151 alloy, which can stably produce consumable ingots with a maximum size of Φ508mm, and solves the cracking of large-size consumable ingots The problem is that the dendrite segregation degree of the prepared Φ508mm self-consumable ingot is also low, which greatly reduces the content of sulfur and inclusions, and improves the purity of the alloy; the metallurgical quality of the GH4151 alloy consumable ingot is improved, which is useful for the preparation of large-scale rods and Large-scale disc forgings lay the groundwork

Images