Vacuum casting method of a nickel-based superalloy ingot

Abstract

The invention discloses a vacuum casting method of a nickel base high-temperature alloy ingot. The method comprises a mold; a water-cooled copper disc is arranged at the bottom of the mold; a circular cooling water channel is formed in the water-cooled cooper disc, so that a melt forms a longitudinal temperature gradient from bottom to top; water mist cold nozzle is arranged on one sides of a first edge and a second edge of the mold, and a resistance heating body is arranged in the corner connecting place of a third edge and a fourth edge, so that the melt forms a transverse temperature gradient from one side to the other side; the longitudinal temperature gradient and the transverse temperature gradient form an inclined temperature gradient, so that a solid-liquid interface is pushed from the bottom of the connecting place of the first edge and the second edge to the top of the connecting place of the third edge and the fourth edge; finally, a solidified part is positioned near the connecting place of the third edge and the fourth edge; and a shrinkage hole shrinks therein.

Description

technical field [0001] The invention belongs to the technical field of material processing, and in particular relates to a vacuum casting method for nickel-based superalloy ingot casting. Background technique [0002] Nickel-based superalloys have abnormal yield strength-temperature effects, as well as high wear resistance and corrosion resistance, and have become important structural materials in the contemporary aerospace industry, civil industry and other fields, especially in the field of aeroengine blades. Broad application prospects. 3D printing, or additive manufacturing, is a rapid prototyping process that has emerged in recent years. It adopts layer-by-layer powder coating, laser or electron beam melting and molding to realize the finishing molding of precision parts and avoid the occurrence of defects in the casting process. Defects such as shrinkage cavity and porosity have become a new material processing method. [0003] At present, the powder used in 3D print...

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Problems solved by technology

[0003] At present, the powder used in 3D printing is generally obtained by vacuum casting into ingots after smelting, followed by secondary smelting and powder making by atomization method, and in the process of vacuum smelting and pouring, it is usually melted in a vacuum induction melting furnace After heat preservation, it is poured into the mold. Since the mold needs to go through induction furnace, vacuuming, melting, pouring and other processes after preheating, the temperature will drop. In the subsequent cutting process, dirt is easy to adhere to the shrinkage cavity and is difficult to remove. Therefore, it is of great significance to find a casting method that reduces the shrinkage cavity of the ingot and avoids the reaction with the mold.

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