A device for directional solidification of superalloy

Abstract

The invention provides a directional solidification device of a high-temperature alloy. The directional solidification device comprises a heating chamber and a mold casting and cooling chamber, wherein the heating chamber and the mold casting and cooling chamber are vacuum chambers which are communicated with each other up and down and insulate heat mutually; a lifting working platform is arranged in the cavity of the heating chamber and the mold casting and cooling chamber; a mold shell is arranged on the lifting working platform; the high-temperature alloy is poured into the mold shell in the heating chamber and enters into the mold casting and cooling chamber along with the descending of the lifting working platform so as to be subjected to directional solidification; a barrel is arranged between the outlet of the heating chamber and a water-cooled hearth and on the outer peripheral surface of the mold shell and filled with solid balls for cooling by contact, wherein the surfaces of the solid balls are dipcoated with gallium-indium liquid films; and the barrel and the solid balls are made of good hot conductors. The directional solidification device provided by the invention is simple and compact, is formed by providing the existing directional solidification furnace with only a few components without constructing a new furnace and changing the original structure, does not need to be provided with a heating device for melting and preserving heat so that the operation is simplified greatly, has an excellent cooling effect and can solve the problem on the heat dissipation of the blade mold shell easily and effectively and improve the growth condition of a single crystal blade.

Description

technical field [0001] The invention relates to precision casting of superalloy parts, in particular to a solid contact cooling directional solidification device used in precision casting of high temperature alloy parts. Background technique [0002] Superalloy single crystal blades are formed by directional solidification in a vacuum furnace by precision casting. Due to the heat dissipation by radiation, the efficiency is low, which makes it difficult to increase the cooling rate and temperature gradient during the solidification process of the blade casting, which seriously affects the yield of the product. In particular, the large blades used in heavy-duty gas turbines have a large volume and a lot of heat, so the heat dissipation efficiency is a big problem. [0003] Now the world is actively developing new processes to improve the growth conditions of single crystal blades. One of the most famous is the liquid metal bath cooling process. Such as figure 1 As shown, a...

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Problems solved by technology

However, because the gas will be blown into the furnace, the temperature of the furnace will be greatly reduced, which will reduce the quality of the blades, so this method has not been applied.

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