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Preparation method for large-specification manganese-containing high-entropy alloy cast ingot

A high-entropy alloy, large-scale technology, applied in the field of nuclear power, can solve the problems of composition segregation and uneven structure, and achieve the effects of accurate composition, good uniformity, and simple and easy process.

Active Publication Date: 2020-04-10
SUZHOU NUCLEAR POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The composition of each element in the high-entropy alloy is relatively average, and there are large differences in parameters such as the melting point, equilibrium distribution coefficient and saturated vapor pressure of each element. At present, the preparation of high-entropy alloy ingots is still in the laboratory stage, and they are all small Ingot casting, and there are serious composition segregation and uneven structure in the preparation process, which is far from meeting the needs of industry

Method used

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  • Preparation method for large-specification manganese-containing high-entropy alloy cast ingot
  • Preparation method for large-specification manganese-containing high-entropy alloy cast ingot

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preparation example Construction

[0026] see figure 1 A method for preparing a large-scale manganese-containing high-entropy alloy ingot of the present invention, comprising the steps of:

[0027] Step 1, according to the content of Fe, Cr, Ni and Mn in the Fe-Cr-Ni-Mn high-entropy alloy is 25 at.%, according to the ingredient list, accurately weigh the weight of Fe, Cr, Ni and Mn. Considering the volatilization of Mn element, the amount of Mn element increased by 5% during batching. Make sure all elements are dry and free from oil, rust oxides. Add each group that has been accurately weighed into the crucible.

[0028] Step 2. Preheat the preheated ingot mold sprayed with zircon powder coating at 180-250°C for 2 hours, and then place it in the pouring position. The bottom of the ingot mold should be covered with ceramic wool, and the outside should be wrapped with ceramic wool to prevent temperature loss. is too big.

[0029] Step 3, argon-filled medium-frequency vacuum induction melting; start the vacuum...

Embodiment 1

[0037] The present embodiment is a kind of Fe-Cr-Ni-Al-Zr0.1 high-entropy alloy, the content of Fe, Cr, Ni and Al element is 25 at.%, described high-entropy alloy is made of the high-purity Fe that purity is 99.9% , 99.8% electrolytic Ni, 99.7% electrolytic Cr, and 99.5% electrolytic Mn are formulated according to the chemical formula Fe-Cr-Ni-Mn, and the stated ratios are atomic ratios.

[0038] Step 1. Put the weighed raw materials into the crucible, evacuate to 1Pa, fill with 5500Pa high-purity argon, and carry out alloy melting in a vacuum induction furnace under the protection of argon atmosphere. During the smelting process, the vacuum degree of argon should be kept at about 5500Pa, and argon can be filled and evacuated intermittently if necessary;

[0039] Step 2. After preheating the ingot mold at 700°C for 1.5 hours and spraying zircon powder coating, after preheating at 200°C for 2 hours, place it in the pouring position and wait for the melting to complete before po...

Embodiment 2

[0047] Step 1, according to the content of Fe, Cr, Ni and Mn in the Fe-Cr-Ni-Mn high-entropy alloy is 25 at.%, according to the ingredient list, accurately weigh the weight of Fe, Cr, Ni and Mn. Considering the volatilization of Mn element, the amount of Mn element increased by 5% during batching. Make sure all elements are dry and free from oil, rust oxides. Add each group that has been accurately weighed into the crucible.

[0048] Step 2: Preheat the ingot mold at 700°C for 1.5 hours and sprayed with zircon powder coating. After preheating at 180°C for 2 hours, place it at the pouring position. The bottom of the ingot mold should be covered with ceramic wool, and the outside should be wrapped with ceramic wool to prevent The temperature loss is too large.

[0049] Step 3, argon-filled medium-frequency vacuum induction melting; start the vacuum pump to vacuumize the raw materials in the crucible, and when the vacuum degree is less than 1Pa, fill high-purity argon to 4500Pa...

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Abstract

The invention discloses a preparation method for a large-specification manganese-containing high-entropy alloy cast ingot. The preparation method for the large-specification manganese-containing high-entropy alloy cast ingot comprises the following steps: weighing the weights of Fe, Cr, Ni and Mn according to the content of 25at.% of Fe, Cr, Ni and Mn elements in a Fe-Cr-Ni-Mn high-entropy alloy,and adding Fe, Cr, Ni and Mn into a crucible; then carrying out primary argon-filled vacuum induction smelting to obtain a primary cast ingot of the high-entropy alloy, then carrying out argon-filledconsumable electro-arc smelting twice, and finally carrying out vacuum heat treatment to obtain the large-specification manganese-containing high-entropy alloy cast ingot. In the aspect of preparationfor the high-entropy alloy, the alloy cast ingot is obtained by carrying out the primary argon-filled vacuum induction smelting, then carrying out the argon-filled consumable electro-arc smelting twice, and then carrying out the vacuum heat treatment; and the method is simple and practicable in a process for preparing a high-entropy material, high in efficiency, low in requirement on equipment, and low in cost. The high-entropy alloy cast ingot prepared by the preparation method is accurate in component and high in uniformity, and provides an excellent blank for the subsequent hot-processingprocedure.

Description

technical field [0001] The invention relates to the technical field of nuclear power, in particular to a method for preparing a large-scale manganese-containing high-entropy alloy ingot. Background technique [0002] In the development of nuclear power, there is a large amount of radiation in the process of nuclear fission. Therefore, the performance requirements for nuclear reactor structural materials are very strict. Especially for nuclear fuel cladding materials, the working conditions are more severe, not only to face high temperature, high pressure and strong neutron irradiation, but also to withstand the threat of corrosion, erosion, vibration and hydrogen embrittlement, etc. The performance requirements of the cladding material are more stringent. [0003] High entropy alloy is a new type of alloy material. The special structure of high-entropy alloys endows them with excellent comprehensive properties. Among them, the most typical organization is a multi-element ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02C22F1/02B22D7/06
CPCB22D7/005B22D7/068C22C1/02C22C30/00C22F1/02
Inventor 梅金娜蔡振韩姚磊周中波吴天栋薛祥义
Owner SUZHOU NUCLEAR POWER RES INST
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