A method of controlling electron transport path to promote desulfurization of electron beam refining superalloys

Abstract

The invention provides a method for controlling the electron transmission path to promote the desulfurization of the high-temperature alloy by electron beam refining, comprising the following steps: S1, pretreatment of the high-temperature alloy raw material; S2, refining and purifying the high-temperature alloy by electron beam, to obtain a high-purity FGH4096 high-temperature alloy ingot . The present invention innovatively proposes a process method of controlling the electron transmission path to promote deep desulfurization by electron beam refining. By controlling the transmission path of the electrons emitted by the electron gun in the metal melt, the sulfur-containing inclusions and desulfurization products are strengthened under the electron beam-induced migration. At the same time, the calcium oxide inner liner is used to promote the desulphurization reaction, which provides a method to promote the deep desulphurization of nickel-based superalloys by electron beam refining.

Description

technical field [0001] The present invention relates to a method for controlling electron transmission path to promote electron beam refining superalloy desulfurization. Background technique [0002] Superalloy materials are widely used in aerospace and other fields, and are important materials for manufacturing hot-end components in aerospace and other fields, such as modern aero-engines, industrial gas turbines and other key hot-end components (such as turbine blades, turbine disks, combustion chambers, etc.). Due to the long-term exposure to extreme working environments such as high temperature, high speed and high stress, there are extremely high requirements for the high temperature strength, creep and fatigue properties of materials. The S impurity element in the superalloy is easy to form a low melting point eutectic, which reduces the plasticity of the material, and is also prone to segregation, which increases the sensitivity of crystal cracks. Therefore, controlli...

AI Technical Summary

Problems solved by technology

However, inclusions such as CaS and calcium aluminate, which are the final products of desulfurization by vacuum induction melting technology, can only be removed by floating, which has a very limited effect on removing small-sized inclusions, which will have a negative impact on the high-purification production of superalloys

Studies in recent years have shown that the desulfurization effect of CaO crucibles is very obvious, but due to the short service life, high cost, and difficult production of calcium oxide crucibles, and the desulfurization effect is greatly reduced after several uses, industrial production is currently unacceptable.

In addition, the CaO crucible is used to smelt superalloys, and the desulfurization reaction is carried out at the interface between the crucible wall and the metal melt, and the generated 3CaO·Al 2 o 3 Although slag is beneficial to deep deoxidation and desulfurization, the problem of crucible refractory corrosion is serious, and the removal of desulfurization products is difficult, which is not conducive to the preparation of high-purity nickel-based superalloys

Images