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Method for performing purified smelting on high-temperature alloy return material by using yttrium oxide crucible

A high-temperature alloy, yttrium oxide technology, applied in the field of vacuum induction melting, can solve the problems of poor chemical stability of magnesium oxide, easy slag formation of acid oxides, and reduced gas element content, so as to reduce the possibility of oxygen supply and high stability. , The effect of easy operation and control

Active Publication Date: 2014-01-08
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, the chemical stability of magnesia is poor, and the magnesia crucible begins to decompose under the condition of 1600 ℃ and vacuum degree of 50Pa, which causes it to supply oxygen to the alloy melt, which not only affects the effect of deoxidation but also affects the process of denitrification
And when smelting high-temperature alloys containing a large amount of highly active elements, they will react with active elements, causing an increase in the content of O and N in the alloy, which is why the content of gas elements cannot be reduced to a lower level even with complex processes reason
[0006] In addition to magnesia crucibles, alumina and calcium oxide are also used as crucible materials for vacuum induction melting superalloys. Since calcium oxide crucibles have higher chemical stability than magnesia and alumina crucibles, it can reduce refractory materials and alloy liquids. Oxygen that enters the alloy liquid due to the reaction of active elements. In recent years, the use of calcium oxide crucibles in vacuum induction melting furnaces has been increasing. However, calcium oxide crucibles are easy to hydrate in the air, and they are easy to form slag with acidic oxides.

Method used

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  • Method for performing purified smelting on high-temperature alloy return material by using yttrium oxide crucible

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for purifying and smelting 25Kg of GH4169 alloy riser return material by using an yttrium oxide crucible, the steps of the method are charging→purifying smelting→casting molding.

[0043] The mass percent of the GH4169 alloy return material is: C is 0.03%, Cr is 18.3%, Ni is 52.7%, Mo is 3.18%, Al is 0.45%, Ti is 1.02%, Nb is 5.26%, Fe is more than quantity.

[0044] The specific purification and smelting steps are:

[0045] Step 1: Install the yttrium oxide crucible and the fully preheated ingot mold in the vacuum induction melting furnace, clean the crucible and ingot mold, and install the yttrium oxide ceramic filter on the sprue cup;

[0046] Ingot mould: put the steel ingot mold into the resistance furnace and raise the temperature to 900°C, keep it warm for 4 hours, and put the fully preheated ingot mold into the vacuum induction furnace casting chamber for pouring;

[0047] Cleaning of the yttrium oxide crucible and ingot mold: Use a dust collector to ...

Embodiment 2

[0058] A method for purifying and smelting 10Kg of K424 alloy sprue return material by using an yttrium oxide crucible, the steps of the method are charging→purifying smelting→casting molding.

[0059] The mass percent of the K424 alloy return material is: C is 0.15%, Cr is 9.7%, Co is 13.6%, W is 1.5%, Mo is 3.1%, Al is 5.2%, Ti is 4.4%, and Nb is 0.8% %, V is 0.7%, B is 0.015%, Zr is 0.02%, Ce is 0.02%, and Ni is the balance.

[0060] Step 1: Install the yttrium oxide crucible and the fully preheated ingot mold in the vacuum induction melting furnace, clean the crucible and ingot mold, and install the yttrium oxide ceramic filter on the sprue cup;

[0061] Ingot mould: Put the graphite mold shell into the molding sand box for molding, then put it into the resistance furnace and heat it up to 600°C for 2 hours, and then put the fully preheated ingot mold into the casting chamber of the vacuum induction furnace for pouring;

[0062] Cleaning of the yttrium oxide crucible and ...

Embodiment 3

[0073] Use yttrium oxide crucible to 25Kg Ni 3 The invention discloses a method for purifying and smelting the returned materials of Al alloy waste castings, and the steps of the method are charging→purifying and smelting→casting molding.

[0074] Said Ni 3 The mass percentage of the Al alloy return material is: Mo is 14.3%, Al is 7.8%, and Ni is the balance.

[0075] Step 1: Install the yttrium oxide crucible and the fully preheated ingot mold in the vacuum induction melting furnace, clean the crucible and the ingot mold, and install an alumina ceramic filter on the sprue cup;

[0076] Ingot mould: Put the yttrium oxide mold shell into the molding sand box for molding, then put it into a resistance furnace and heat it up to 900°C for 2 hours, and then put the fully preheated ingot mold into the casting chamber of the vacuum induction furnace for pouring;

[0077] Cleaning of the yttrium oxide crucible and ingot mold: Use a dust collector to clean the inner wall of the yttri...

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Abstract

The invention discloses a method for performing purified smelting on a high-temperature alloy return material by using an yttrium oxide crucible. The method comprises the steps of charging, performing purified smelting and pouring. The method provided by the invention can reduce the O content and the N content of the return material to be less than 5 ppm only by adopting a one-time smelting process and without smelting for many times and adding a deoxidant for many times, so the process steps are simplified and energy consumption is reduced. According to the method provided by the invention, a carbon element is added in the permitted range of alloy elements to perform deoxidation, and harmful elements of which the content needs to be controlled strictly are not introduced, so the influence of the harmful elements on alloy melt is eliminated during deoxidation and denitrification.

Description

technical field [0001] The invention relates to the field of vacuum induction smelting, and more particularly refers to a method for purifying and smelting high-temperature alloy return material by using an yttrium oxide crucible. Background technique [0002] With the continuous development of aerospace, petrochemical, transportation, energy and power industries, more and more high-temperature alloys are used, and the quality requirements for their parts are also getting higher and higher. In order to meet the demanding comprehensive performance requirements, a large number of rare and precious strategic metal elements are added to superalloys, including nickel, chromium, molybdenum, tungsten, cobalt, niobium, titanium, hafnium, rhenium, etc. However, usually the material utilization rate of superalloy parts is only 20% to 30%, and some parts with complex shapes are even only 10%. Such waste exists in the form of superalloy return material. Nearly 10,000 tons of high-temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C1/06B22D21/06
Inventor 徐惠彬白洪波张花蕊张虎
Owner BEIHANG UNIV
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