A kind of high-entropy alloy powder with low nitrogen content and its preparation method and application
A high-entropy alloy and nitrogen content technology, which is applied in the field of additive manufacturing, can solve the problems of excessive N content in powder, reduce powder quality, and adverse effects on alloy performance, etc., achieve low N content, easy operation, and improve mechanical properties and product quality. Effect
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[0023] The preparation method of the high-entropy alloy powder with low nitrogen content provided by the embodiment of the present invention comprises the following steps:
[0024] Carrying out the first smelting and the first refining of the material providing the elements of the first element group in the raw material of the high-entropy alloy, and then adding the material providing the elements of the second element group for the second refining and the third refining, and then Pouring atomization.
[0025] Wherein, the first element group includes at least two of Ta, Co, W, Mo, Fe, Ni, Cr, Cu, Ce, Re and Nb. The second element group includes at least one of Ti, B, Zr, Mn and Al.
[0026] In some preferred embodiments, the purity of the material providing any one element in the first element group and the second element group is ≥90%. More preferably, the purity of the above-mentioned materials is ≥99%; optimally, the purity of the above-mentioned materials is ≥99.9%.
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Embodiment 1
[0051] The chemical formula of the high-entropy alloy powder with low nitrogen content for 3D printing provided in this example is: AlNiNbTa0.5TiZr, and 150 kg of the alloy is smelted in a single furnace.
[0052] The preparation method includes as follows:
[0053] 1. Raw material preparation: Polish off the oxides and attached sundries on the surface of the required alloy raw materials until the metallic luster appears. Then put in alcohol or acetone solution and use ultrasonic cleaning for 25 minutes, after cleaning, put it into an oven at 60°C for 10 hours of drying.
[0054] 2. Arrangement of charge: Before smelting, distribute materials in the crucible in a specific order, and add 1 / 3 of Ni chips, all Ta strips and the remaining 2 / 3 of Ni blocks in sequence.
[0055] 3. The first smelting: use a vacuum induction furnace for smelting. When the vacuum in the furnace reaches ≤5Pa, start heating with 10kW power to remove the gas attached to the raw material. When the vacuum...
Embodiment 2
[0062] The chemical formula of the high-entropy alloy powder with low nitrogen content for 3D printing provided in this example is: CoCrNiFeTiAl, and 150 kg of the alloy is smelted in a single furnace.
[0063] The preparation method includes as follows:
[0064] 1. Raw material preparation: Polish off the oxides and attached sundries on the surface of the required alloy raw materials until the metallic luster appears. Then put in alcohol or acetone solution and use ultrasonic cleaning for 35 minutes, after cleaning, put it into an oven at 80°C for 8 hours of drying.
[0065] 2. Arrangement of charge: Before smelting, it is necessary to arrange the materials in the crucible according to a specific order, and then add 1 / 3 of Ni chips, all Co blocks, Fe blocks, and the remaining 2 / 3 of Ni blocks.
[0066] 3. The first smelting: use a vacuum induction furnace for smelting. When the vacuum degree in the furnace reaches ≤5Pa, start heating with 40kW power to remove the gas attache...
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