A kind of smelting method of fecrconial high entropy alloy

Abstract

A smelting method of FeCrCoNiAl high-entropy alloy belongs to the technical field of metallurgy. It includes (1) vacuum pre-melting: sequentially charging electrolytic nickel, metallic chromium, and electrolytic cobalt into a vacuum induction furnace for melting, casting into ingots, and breaking them into blocks after demoulding to obtain nickel-chromium-cobalt alloy blocks; (2) vacuum Secondary smelting: After the pure iron and nickel-chromium-cobalt alloy blocks are put into the vacuum induction furnace for melting, the vacuum is stopped, the power is cut off, and the argon is charged. Steel temperature, electrified tapping, and casting into a water-cooled ingot mold to obtain FeCrCoNiAl high-entropy alloy ingots. The invention divides the smelting process into two stages, so that the degassing task is placed in the pre-melting stage, the vacuum secondary smelting time is greatly reduced, the substitution amount of inclusions is reduced, and the obtained high-entropy alloy ingot has good uniformity, Fe, Cr , Co, Ni, Al and other elements have good macrosegregation indices.

Description

technical field [0001] The invention relates to a method for smelting FeCrCoNiAl high-entropy alloy, in particular to a method for smelting FeCrCoNiAl high-entropy alloy in a vacuum induction furnace. Background technique [0002] High-entropy alloys are alloys with high mixing entropy formed by the alloying of more than five metals in equiatomic ratio or near equiatomic ratio. After solidification, they can form relatively simple phase structures, including FCC, BCC and HCP structures. Studies have shown that high-entropy alloys have many properties superior to traditional alloys, including thermal stability, low stacking fault energy, radiation resistance, corrosion resistance, and easy to overcome the "trade-off" effect in performance. Due to the excellent performance of high-entropy alloys, high-entropy alloys have shown great development potential in the fields of electrical engineering, engines, hard tools, and light-to-heat conversion. [0003] However, the preparati...

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Problems solved by technology

[0005] Among the currently disclosed technologies, patent 202010202852.4 discloses a refractory high-entropy alloy and its forming method, which adopts electromagnetic induction levitation to smelt refractory high-entropy alloys. Although the method is novel, it requires extremely high levels of equipment and technology, such as The melting environment requires a vacuum degree of 10 -3 ~10 -4 Pa, which makes it impossible for industrial vacuum equipment to reach; patent 201910237623.3 discloses a FeCrVTiMn high-entropy alloy and a method of using it for laser additive manufacturing of complex channel structures. The high-entropy alloy is smelted by powder melting layered deposition method. It can effectively avoid the segregation of alloy components, but the efficiency is too low, and there is no prospect of industrialization; patent 201610137258.5 discloses a biomedical TiZrNbTa series high-entropy alloy and its preparation method. A vacuum electric arc furnace is used to prepare high-entropy alloys. This method is to ensure high-entropy alloys The composition is uniform, and the melting in the crucible is repeated for 4 times or more, which will inevitably introduce foreign inclusions such as crucible refractory materials, which will have a great impact on the cleanliness of the alloy

[0006] In short, among the currently disclosed technologies, especially the induction smelting technology, there is no comprehensive technical method suitable for industrialization that can overcome element oxidation, block foreign inclusions and reduce solidification segregation

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