Directional solidification smelting device and method for refractory high-entropy alloy

Abstract

The invention discloses a directional solidification smelting device and method for a refractory high-entropy alloy. The directional solidification smelting device comprises a quartz glass tube, a smelting crucible, an induction coil and a smelting power supply, wherein an alloy raw material fills the smelting crucible and is positioned inside the quartz glass tube; the induction coil is connectedwith the smelting power supply and sleeves the quartz glass tube for smelting the alloy raw material in the smelting crucible; the directional solidification smelting device further comprises a lifting device; and the induction coil is connected with the lifting device and is driven by the lifting device to ascend and descend along the quartz glass tube. The directional solidification smelting device and method for the refractory high-entropy alloy have the advantages that alloy ingots smelted are regular in molding, uniform in internal structure, and concentrated in defects, such as shrinkage cavity and shrinkage porosity.

Description

technical field [0001] The invention relates to the field of alloy smelting, in particular to a directional solidification smelting equipment and smelting method for refractory high-entropy alloys. Background technique [0002] Superalloys are key structural materials in the fields of aerospace and industrial power. They have become an irreplaceable material for military and civilian high-temperature gas turbines, and play a very important role in promoting the progress of industry and human civilization. Especially in the military field, with the continuous improvement of military aircraft performance requirements, the proportion of superalloys in engine materials is getting higher and higher, and higher requirements are also put forward for alloy performance, such as higher high temperature strength and specific strength , higher operating temperature and so on. High-temperature nickel-based alloys are the most mature high-temperature structural materials. After continuou...

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Problems solved by technology

However, the heating method of this process is point heating, combined with the bottom water-cooled copper mold to dissipate heat, so the melting raw materials cannot be in a molten state at the same time, so it is difficult to ensure uniform stirring

In addition, the melting points of RHEAs components are quite different, and this heating and heat dissipation method will lead to a large range of liquid-solid two-phase mixing zone in the alloy ingot, and the local area will solidify successively during solidification, resulting in large-scale dispersed shrinkage. Loose and element segregation, the use of arc melting process results in uneven structure of refractory high-entropy alloys, non-concentrated defects and difficult forming

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