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Preparation method for nickel-based alloy ingot

A nickel-based alloy and nickel powder technology is applied in the field of preparation of nickel-based alloy ingots, which can solve the problems of difficulty in obtaining alloy ingots, unfavorable thermal-mechanical processing of alloy ingots, etc., and achieves the effects of ensuring composition uniformity and increasing costs.

Active Publication Date: 2015-11-25
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the different solidification characteristics of different alloys, there may be defects such as pores and porosity in the finally obtained alloy ingot, which is not conducive to further thermo-mechanical processing of the alloy ingot
The advantage of vacuum arc melting technology is that it can obtain dense alloy ingots, and there are no defects such as pores or porosity in the alloy ingots, but its disadvantage is that it is difficult to obtain alloy ingots with uniform macroscopic components if the electrode composition is not uniform

Method used

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  • Preparation method for nickel-based alloy ingot
  • Preparation method for nickel-based alloy ingot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This embodiment includes the following steps:

[0022] Step 1, uniformly mix nickel powder and metal element powder to obtain a mixed powder, then press the mixed powder to obtain a pre-sintered block; the metal element powder is tungsten powder, and the mass content of the tungsten powder in the mixed powder is 14 %, the balance is nickel powder;

[0023] Step 2: Sintering the pre-sintered block under the protection of hydrogen to obtain a pre-sintered block; the temperature of the sintering process is 1200° C., and the time is 2 hours;

[0024] Step 3. Place the pre-melted block described in step 2 in a medium-frequency induction melting furnace, and perform medium-frequency induction melting treatment under the condition that the pressure in the furnace is less than 10 Pa to obtain a nickel-based alloy melt with a temperature of 1800° C., and then melt the The nickel-based alloy melt is cast under the condition that the degree of vacuum is not greater than 100Pa to ...

Embodiment 2

[0044] This embodiment includes the following steps:

[0045] Step 1, uniformly mix nickel powder and metal element powder to obtain a mixed powder, then press the mixed powder to obtain a pre-sintered block; the metal element powder is tungsten powder, and the mass content of the tungsten powder in the mixed powder is 1 %, the balance is nickel powder;

[0046] Step 2: Sintering the pre-sintered block under the protection of hydrogen to obtain a pre-sintered block; the temperature of the sintering process is 1000° C., and the time is 4 hours;

[0047]Step 3. Place the pre-melted block described in step 2 in an intermediate frequency induction melting furnace, and carry out intermediate frequency induction melting treatment under the condition that the pressure in the furnace is less than 10 Pa to obtain a nickel-based alloy melt with a temperature of 1600° C. The nickel-based alloy melt is cast under the condition that the degree of vacuum is not greater than 100Pa to obtain...

Embodiment 3

[0054] This embodiment includes the following steps:

[0055] Step 1, uniformly mix nickel powder and metal element powder to obtain a mixed powder, then press the mixed powder to obtain a pre-sintered block; the metal element powder is tungsten powder, and the mass content of the tungsten powder in the mixed powder is 24 %, the balance is nickel powder;

[0056] Step 2, sintering the pre-sintered block under the protection of hydrogen to obtain a pre-fritted block; the temperature of the sintering process is 1100° C., and the time is 3 hours;

[0057] Step 3. Place the pre-melted block described in step 2 in an intermediate frequency induction melting furnace, and perform intermediate frequency induction melting treatment under the condition that the pressure in the furnace is less than 10Pa to obtain a nickel-based alloy melt with a temperature of 1700°C, and then melt the The nickel-based alloy melt is cast under the condition that the degree of vacuum is not greater than ...

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Abstract

The invention discloses a preparation method for a nickel-based alloy ingot. The method includes the steps that firstly, nickel powder and metal element powder are evenly mixed and then pressed, so that a block to be sintered is obtained; secondly, the block to be sintered is sintered under the hydrogen protection condition, so that a block to be molten is obtained; thirdly, the block to be molten is placed in a medium-frequency induction melting furnace to be subjected to medium-frequency induction melting treatment, so that nickel-based alloy melt is obtained, and then the nickel-based alloy melt is poured to obtain a melting electrode; and fourthly, the melting electrode is placed in a vacuum arc melting furnace to be subjected to vacuum arc melting treatment, so that the nickel-based alloy ingot is obtained. According to the method, the nickel-based alloy ingot is prepared by combining technological processes of medium-frequency induction melting treatment and vacuum arc melting treatment, the advantages of the two melting technologies are fully used, the defects of the two melting technologies are also overcome, and the obtained nickel-based alloy ingot has uniform macro components and a compact microstructure.

Description

technical field [0001] The invention belongs to the technical field of nickel-based alloy preparation, and in particular relates to a method for preparing a nickel-based alloy ingot. Background technique [0002] The preparation of nickel-based alloy ingots is the basis for the development of metal substrates for coated conductors and the development of nickel-based superalloys. For binary or multi-component nickel-based alloy ingots, medium-frequency induction melting technology can be used to obtain nickel-based alloy ingots, or vacuum arc melting technology can be used to obtain nickel-based alloy ingots. But both technologies have varying degrees of advantages and disadvantages. When the medium frequency induction melting technology is used to prepare nickel-based alloy ingots, its advantage is that nickel and other metal elements in the alloy are completely melted, and under the action of corresponding electromagnetic force stirring, the uniformity of the overall compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C19/03
Inventor 于泽铭郑会玲金利华王耀李成山张平祥
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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