Method for preparing alloy K414 from return scraps of cast high-temperature alloy K414

A high-temperature alloy and return material technology, applied in the field of casting high-temperature alloy, can solve the problems of material waste and high production cost, and achieve the effect of reducing production cost and improving utilization rate

Inactive Publication Date: 2013-03-13
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, all wear-resistant casting superalloys used in production are new material alloys produced with pure elements (that is, using a variety of pure elements for smelting superalloys), and the production cost is relatively high, and in the production of castings, the effective utilization rate is 30%. About 70% of the material will not be used as a gating system, so a large amount of returned material will be generated in mass production. If it is not utilized, it will cause waste of material

Method used

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  • Method for preparing alloy K414 from return scraps of cast high-temperature alloy K414
  • Method for preparing alloy K414 from return scraps of cast high-temperature alloy K414
  • Method for preparing alloy K414 from return scraps of cast high-temperature alloy K414

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Experimental program
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Effect test

Embodiment 1

[0023] Using the utilization plan of 100% returned material, the process of preparing K414 alloy is as follows:

[0024] (1) Pretreatment of raw materials:

[0025] Firstly, the return materials generated during the production process of K414 alloy castings, namely risers, runners and waste castings, are rolled and ground to remove the nitrogen-rich layer on the surface of the materials, and then sand blasted to remove the black dust in the sharp corners of the materials And the remaining shells on the surface, etc., to achieve a smooth surface, then pickling and washing the material, and finally use compressed air to remove the residual moisture on the surface of the material. After the materials are sorted, they are used to return raw materials for alloy smelting;

[0026] (2) Alloy primary smelting:

[0027] Alloy smelting: Put the pretreated K414 return material into the melting crucible, and use a vacuum induction melting furnace to melt the alloy. When the vacuum degre...

Embodiment 2

[0046] Using the utilization plan of 100% returned material, the process of preparing K414 alloy is as follows:

[0047] (1), the pretreatment of raw material: with embodiment 1;

[0048] (2) Alloy primary smelting:

[0049] Alloy smelting: when the vacuum degree is less than 6Pa, the melting is carried out in stages, and the heating rate is controlled to be 15°C / min. Add all the returned materials in batches, and finally raise the temperature to the refining temperature at 10°C / min;

[0050] Alloy refining treatment: the refining temperature is 1550°C, the vacuum degree of the melting chamber is kept within 1Pa, and the refining time is 30 minutes;

[0051] Stirring treatment: stop heating after refining, and use low frequency to stir the alloy, the low frequency is 200Hz, and the treatment time is 20min; then pour the molten steel when it is cooled to 1500°C to obtain the return material alloy ingot, and the pouring process adopts two-stage filtration Mesh filter, the ape...

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Abstract

The invention aims at providing a method for preparing alloy K414 from return scraps of cast high-temperature alloy K414. The method is characterized in that all return scraps are adopted to produce the alloy K414, and special pretreatment is carried out on surfaces of the return scraps so as to remove all impurities remaining on the surfaces; and then the return scraps are subjected to two-time high-temperature refining treatment, and low-frequency stirring is adopted during refining so as to further remove low-melting-point impurities and oxides from materials. Filter screens of two-level different pore diameters are adopted to block slag during pouring, so that the purity of the alloy is further improved. According to the method, return scrap resources are sufficiently utilized, a 100% return scrap utilization scheme is adopted, a vacuum induction melting method is used for producing return scrap alloy, and the material utilization ratio is increased on the premise that the quality of the alloy is guaranteed, so that the production cost can be effectively reduced.

Description

technical field [0001] The invention belongs to the field of casting high-temperature alloys, and particularly provides a method for preparing K414 alloys by using returned materials of casting high-temperature alloys K414. Background technique [0002] The wear-resistant casting superalloy is a high-temperature alloy for gas turbine structural parts. The alloy has good high-temperature performance, and its outstanding feature is good wear resistance. At present, all wear-resistant casting superalloys used in production are new material alloys produced with pure elements (that is, using a variety of pure elements for smelting superalloys), and the production cost is relatively high, and in the production of castings, the effective utilization rate is 30%. About 70% of the material will not be used as a gating system, so a large amount of returned material will be generated in mass production. If it is not utilized, it will cause a waste of material. Contents of the inventi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C1/02C22C19/05
Inventor 王宇飞满延林杨刚王永明石玉娥
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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