Ingot mould, smelting system and production method of large ingot type alloy ingot

Abstract

The invention provides an ingot mold, a smelting system and a production method of a large ingot type alloy ingot. The ingot mold includes an ingot mold body and a metal bottom pad and a refractory lining arranged in the ingot mold body; the refractory bottom lining is arranged at the bottom of the ingot mold body, and the metal bottom pad is arranged on One side of the bottom of the ingot mold body. Smelting systems, including ingot moulds. The production method of large ingot-type alloy ingots includes: melting the high-temperature alloy to obtain alloy liquid, and then casting it into the ingot mold to obtain ingots. The ingot mold provided by this application is added with a metal bottom pad, which makes the temperature field distribution at the bottom of the ingot more uniform, reduces the stress concentration at the bottom of the ingot and reduces the sensitivity of cracks at the bottom; avoids the direct impact of the metal casting flow on the refractory lining The impact reduces the erosion of the refractory lining, and at the same time avoids the generation of bottom inclusions. The reduction in the number of bottom inclusions as a potential crack source also reduces the sensitivity to cracks at the bottom of the ingot.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to an ingot mold, a smelting system and a production method for a large ingot type alloy ingot. Background technique [0002] GH4738 alloy is mostly produced by double (VIM+VAR) or triple (VIM+ESR+VAR) smelting process to ensure high-quality superalloy ingots. Among them, vacuum induction melting (VIM) is the first step of the smelting process, which is mainly responsible for the tasks of adjusting alloy composition, degassing and controlling inclusions, and casting and remelting electrodes. For emerging applications such as rotating components in power generation turbines or aviation turbines, there is an increasing need for higher weight and larger diameter superalloy ingots. Cracking is not a major problem for small diameter ingots, and the possibility of cracking is greater when the ingot is larger. For larger diameter ingots, not only must the final part size be economically achieve...

AI Technical Summary

Problems solved by technology

At the same time, at the beginning of casting, the impact of the metal casting stream on the refractory lining is very large, which accelerates the erosion of the refractory material in the refractory lining and even forms impact pits on the refractory lining, which may also lead to bottom slag inclusions

[0005] The above-mentioned problems are not unique to the GH4738 alloy. With the expansion of the superalloy ingot shape, electrode cracking is more serious in the production process of large-size ingots.

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