A method for promoting desulfurization of nickel-based superalloys by electron beam refining through slagging

Abstract

The invention provides a method for promoting the desulfurization of nickel-based superalloy by electron beam refining through slagging, comprising the following steps: S1, pretreatment of high-temperature alloy raw materials; S2, electron beam refining and purification of nickel-based superalloy to obtain high-purity FGH4096 high temperature Alloy ingots. The present invention combines the deep desulfurization process of slagging metallurgy and electron beam refining technology, and utilizes the desulfurization reaction to occur in 3CaO·Al 2 o 3 Principle at the interface of slag and alloy liquid by adding CaO‑A1 at the bottom of the raw material 2 o 3 ‑CaF 2 It is a slag agent, relying on the process of slag floating and desulfurization, to carry out deep desulfurization of nickel-based superalloy melt. In addition, the electron beam induced solidification technology is used to induce the removal of inclusions and slag agents, which further reduces the metallurgical pollution caused by slagging, and provides a method to promote the deep desulfurization of nickel-based superalloys by electron beam refining. .

Description

technical field [0001] The invention relates to a method for promoting the desulfurization of nickel-based high-temperature alloy by electron beam refining through slagging. Background technique [0002] Superalloys are important high-temperature structural materials required for key hot-end components (such as turbine blades, turbine disks, etc.) such as modern aero-engines and industrial gas turbines. Trace impurity elements in alloys have a great impact on the performance of superalloys. S is One of the main impurity elements. S impurity elements in superalloys tend to form low-melting eutectics, which reduce the plasticity of the material, and are also prone to segregation, increasing the sensitivity to crystallization cracks. Therefore, controlling and reducing the content of sulfur element is the key to solve the problem of ultra-purification of superalloy base metal. [0003] For the desulfurization of nickel-based superalloys, usually a more feasible method is to m...

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 erosion is more serious, and the removal of desulfurization products is difficult, which is not conducive to the preparation of high-purity nickel-based superalloys

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