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Refining agent for high-temperature alloy used in the case of relatively high superheat and its preparation and application

A high-temperature alloy and refiner technology, which is applied in the field of superalloy refiner and its preparation, can solve the problems of not having a refinement effect, and achieve the effects of low manufacturing cost, simple addition method and high economic benefit

Active Publication Date: 2019-10-22
辽宁红银金属有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some people add NiAl and Ni to superalloys 3 Al acts as the nucleation core, but they re-melt into the alloy when the superheat is high, and do not play a role in refinement

Method used

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  • Refining agent for high-temperature alloy used in the case of relatively high superheat and its preparation and application
  • Refining agent for high-temperature alloy used in the case of relatively high superheat and its preparation and application
  • Refining agent for high-temperature alloy used in the case of relatively high superheat and its preparation and application

Examples

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Effect test

Embodiment 1

[0035] In this example, the refining agent is prepared according to the method described in the technical solution of the present invention, and the process is as follows figure 1 Shown, and applied to the preparation of K418B alloy test rod. Firstly, the NiCoAlCrC master alloy ingot is prepared by vacuum smelting technology, and then the NiCoAlCrC master alloy powder is prepared by atomization treatment method, and after sieving and classification, the master alloy powder with a particle size in the range of 30-60 mesh is obtained, such as figure 2 shown. The composition content of the NiCoAlCrC master alloy powder is: Co 23%, Al 5%, Cr 8%, C 0.15%, and Ni. Then mix with W powder and WC powder with a particle size of 300-500 mesh, the weight ratio is: NiCoAlCrC master alloy powder 50%, W powder 30%, WC powder 20%, see image 3 . Hot isostatic pressing into ingots at a temperature of 200°C and a time of 12 hours, see Figure 4 . Finally, it is added in the form of a cyli...

Embodiment 2

[0037] In this embodiment, the refining agent is prepared according to the method described in the technical solution of the present invention, and applied to the casting of K418B alloy. Firstly, the NiCoAlCrC master alloy ingot is prepared by vacuum smelting technology, and then the NiCoAlCrC master alloy powder is prepared by the atomization method, and the master alloy powder with a particle size in the range of 30-60 mesh is obtained after sieving and classification. The composition content of the NiCoAlCrC master alloy powder is: Co 20%, Al 6%, Cr 9%, C 0.12%, and Ni. Then it is mixed with W powder and WC powder with a particle size of 500-800 mesh, and the weight ratio is 65% of NiCoAlCrC master alloy powder, 20% of W powder and 15% of WC powder. Hot isostatic pressing into ingots under the conditions of temperature 300°C and time 6h. Finally, it is added in the form of a cylindrical ingot during the pouring process of the K418B alloy casting, and the outside is wrapped...

Embodiment 3

[0039]In this embodiment, the refining agent is prepared according to the method described in the technical solution of the present invention, and applied to the casting of K418B alloy. Firstly, the NiCoAlCrC master alloy ingot is prepared by vacuum smelting technology, and then the NiCoAlCrC master alloy powder is prepared by the atomization method, and the master alloy powder with a particle size in the range of 30-60 mesh is obtained after sieving and classification. The composition content of the NiCoAlCrC master alloy powder is: Co 25%, Al 4%, Cr 10%, C 0.17%, and Ni. Then it is mixed with W powder and WC powder with a particle size of 800-1000 mesh, and the weight ratio is 55% of NiCoAlCrC master alloy powder, 20% of W powder and 25% of WC powder. Hot isostatic pressing into ingots under the conditions of temperature 350°C and time 3h. Finally, it is added in the form of a cylindrical ingot during the pouring process of the K418B alloy casting, and is wrapped with nicke...

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Abstract

The invention relates to the field of precision casting and material preparing, in particular to a high-temperature alloy refining agent used under the high superheat degree situation and preparing and application of the high-temperature alloy refining agent. The vacuum induction smelting technology is used for preparing a NiCoAlCrC intermediate alloy ingot, then, the vacuum atomization method isutilized for preparing powder, and the powder is mixed with W powder and WC powder. Pressing is conducted in a hot isostatic pressing furnace, and an ingot is formed. In the specific casting technology, the ingot is added in alloy liquid in a certain adding manner, and a fine grain structure is finally obtained. The chemical components of the refining agent are main composition elements of the alloy, and exogenous impurities cannot be introduced. The refining agent microstructure has two parts including a core part and a skin, the high-melting-point W element serves as the main part of the skin, and the function that the core part is protected against remelting in the high superheat degree is achieved. The refining agent does not pollute the alloy, and the phenomenon of declination is notlikely to happen during usage. The refining agent preparing process is simple, adding is convenient, cost is low, and the high-temperature alloy refining agent is applicable to high-temperature alloycastings requiring fine grain structures under the high superheat degree.

Description

Technical field: [0001] The invention relates to the fields of precision casting and material preparation, in particular to a high-temperature alloy refiner used in the case of relatively high superheat, its preparation method and application. Background technique: [0002] The future development of the aviation industry requires engines with high thrust, high efficiency and low fuel consumption. Single crystal superalloys have become the material of choice for advanced engine turbine blades due to their excellent high-temperature performance. Disks, centripetal impellers, etc. are still manufactured by ordinary precision casting technology. This process causes columnar grains to appear in the transition area of ​​the blade, a chill layer exists at the trailing edge, and abnormally coarse grains are produced in the middle of the disc. It not only leads to the degradation of material properties, but also causes premature fatigue damage to the blades, which cannot meet the r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C1/06C22C35/00C22C30/00C22C32/00
Inventor 杨金侠周亦胄孙晓峰
Owner 辽宁红银金属有限公司
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