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Vacuum induction smelting process for greatly lowering N element content in nickel-base high-temperature alloy

A nickel-based superalloy, vacuum induction melting technology, applied in the field of alloy melting, can solve problems such as unreasonable melting process, restricting the application and development of superalloys, etc., and achieve the effect of reducing the reaction

Active Publication Date: 2017-06-20
JIANGSU LONGDA SUPERALLOY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the relatively mature vacuum induction melting in foreign countries can reduce the N content in the alloy to below 10ppm. The N content is often as high as 30ppm, and there is a significant gap with foreign countries, which restricts the practical application and further development of superalloys in my country.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 A vacuum induction melting process for greatly reducing the N element content in a nickel-based superalloy, the chemical composition (mass fraction) of the nickel-based superalloy is: 0.6% Al, 16% Cr, 2.8% Mo, 5.5% Ta +Nb, 0.9% Ti, 15% Fe, 0.08% C, 0.002% B, 0.015% Zr, the balance being Ni, smelting 2000kg alloy in a single furnace.

[0025] Specific steps are as follows:

[0026] 1. Raw material preparation: Polish off the oxides and attached sundries on the surface of the required nickel-based superalloy raw materials, put them in alcohol or acetone solution and use ultrasonic cleaning, and put them in an oven at 60-80°C for 8h-10h after cleaning drying.

[0027] 2. Arrangement of charge: Before smelting, it is necessary to distribute materials in the crucible in a specific order, add about 1 / 3 of Ni blocks, all Ta strips, Mo strips, Cr blocks, Fe blocks, and the remaining 2 / 3 of Ni blocks.

[0028] 3. The first smelting: Use a vacuum induction furnace for...

Embodiment 2

[0034] The embodiment of the present invention provides a vacuum induction melting process for greatly reducing the N element content in the nickel-based superalloy. The chemical composition (mass fraction) of the nickel-based superalloy is: 0.5% Al, 19% Cr, 3.1% Mo, 5.3 %Ta+Nb, 1.1%Ti, 18.5%Fe, 0.05%C, 0.004%B, 0.03%Zr, the balance is Ni, smelting 2000kg alloy in a single furnace.

[0035] Specific steps are as follows:

[0036] 1. Preparation of raw materials: Polish off the oxides and attached sundries on the surface of the required nickel-based superalloy raw materials, put them in alcohol or acetone solution and use ultrasonic cleaning, and put them in an oven at 80°C for 8 hours after cleaning.

[0037] 2. Arrangement of charge: Before smelting, it is necessary to distribute materials in the crucible in a specific order, add 1 / 3 of Ni blocks, all Ta strips, Mo strips, Cr blocks, Fe blocks, and the remaining 2 / 3 of Ni blocks.

[0038] 3. The first smelting: Use a vacuum in...

Embodiment 3

[0044] The embodiment of the present invention provides a vacuum induction melting process for greatly reducing the N element content in the nickel-based superalloy. The chemical composition (mass fraction) of the nickel-based superalloy is: 0.7% Al, 22% Cr, 2.0% Mo, 6.0 %Ta+Nb, 0.5%Ti, 15.5%Fe, 0.02%C, 0.006%B, 0.05%Zr, the balance is Ni, smelting 2000Kg alloy in a single furnace.

[0045] Specific steps are as follows:

[0046] 1. Raw material preparation: Polish off the oxides and attached sundries on the surface of the required nickel-based superalloy raw materials, put them in alcohol or acetone solution and use ultrasonic cleaning, and put them in an oven at 60-80°C for 8h-10h after cleaning drying.

[0047] 2. Arrangement of charge: Before smelting, it is necessary to distribute materials in the crucible in a specific order, add 1 / 3 of Ni blocks, all Ta strips, Mo strips, Cr blocks, Fe blocks, and the remaining 2 / 3 of Ni blocks.

[0048] 3. The first smelting: Use a v...

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Abstract

The invention relates to a vacuum induction smelting process for greatly lowering the N element content in nickel-based high-temperature alloy and belongs to the technical field of alloy smelting. Firstly, elements including Ni, Ta, Mo, Cr and Fe which are low in appetency with N in raw materials required for smelting are arranged from bottom to top in sequence in a crucible, and super-high-temperature refining N-removal is performed after the elements are heated and melted; melt is controlled to be lowered to a proper temperature after refining is finished, then strong nitrides are added in sequence to from elements including Nb, Ti and Al, and melting and refining are performed again; finally, when the melt is controlled to be lowered to a certain temperature, microelements including C, B and Zr which are prone to burning loss and volatilization are added; and meanwhile, stirring is performed, pouring is performed after alloy liquid is completely clean again, and smelting is finished. The vacuum induction smelting process has quite remarkable and excellent N-removal effect, the N content of the nickel-based high-temperature alloy smelted by the smelting process can be lowered to 6 ppm or below compared with that smelted by an existing smelting method, and vacuum induction smelting process is suitable for industrialized smelting of mother alloy of the nickel-based high-temperature alloy with a high requirement for the N content.

Description

technical field [0001] The invention relates to a vacuum induction smelting process for greatly reducing the content of N elements in nickel-based superalloys. The process is suitable for industrial smelting of nickel-based superalloy master alloys with high requirements on N content, and belongs to the technical field of alloy smelting. Background technique [0002] Nickel-based superalloys are multi-element alloys with very complex compositions, and generally contain strong nitride-forming elements, such as Nb, Ti, and Al; in addition, Cr is an essential alloying element, and its raw materials contain There is a large amount of N, so N cannot be effectively removed during the smelting process of alloys with high content of the above elements. When the N element content of the nickel-based superalloy is high, it is easy to form nitrides. When the number of these nitride inclusions is too large, it will form a crack source during the service process of the alloy, which will ...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C1/02
CPCC22C1/023C22C19/055C22C19/056
Inventor 王颜臣浦益龙王博周向东吕斌
Owner JIANGSU LONGDA SUPERALLOY MATERIAL CO LTD
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