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Rare-earth refiner used for K4169 superalloy, and preparation and application methods thereof

A high-temperature alloy and compound refiner technology, applied in the field of rare earth refiner

Inactive Publication Date: 2015-08-19
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since superalloys are particularly sensitive to inclusions, the choice of refiner must be careful

Method used

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  • Rare-earth refiner used for K4169 superalloy, and preparation and application methods thereof
  • Rare-earth refiner used for K4169 superalloy, and preparation and application methods thereof
  • Rare-earth refiner used for K4169 superalloy, and preparation and application methods thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Select high-purity raw materials, according to the A given in Table 2 1 、A 4 The chemical composition ratio weighs raw materials,

[0034] 2. Use a non-consumable vacuum magnetron electric arc furnace at a vacuum degree of 5×10 3 Pa, the melting medium is Ar, the melting current is 900A, and the melting temperature is 3000°C to prepare A 1 、A 4 Two button ingots,.

[0035] 3. Use the master alloy ingot to smash the button ingot into small pieces, then grind these small pieces into granules with a mortar, and use a sieve to take out the powdery particles with a particle size of 150-250 mesh;

[0036] 4. Weigh 1700g of K4169 master alloy, and weigh A 1 、A 4 255g of two kinds of granules, uniformly mixed as refiner;

[0037] 5. Alloy pouring and testing.

Embodiment 2

[0039] 1. Select high-purity raw materials, according to the A given in Table 2 1 、A 2 、A 3 The chemical composition ratio weighs raw materials,

[0040] 2. Use a non-consumable vacuum magnetron electric arc furnace at a vacuum degree of 5×10 3 Pa, the melting medium is Ar, the melting current is 900A, and the melting temperature is 3000°C to prepare A 1 、A 2 、A 3 Two button ingots,.

[0041] 3. Use the master alloy ingot to smash the button ingot into small pieces, then grind these small pieces into granules with a mortar, and use a sieve to take out the powdery particles with a particle size of 150-200 mesh;

[0042] 4. Weigh 1700g of K4169 master alloy, and weigh A 1 、A 2 、A 3 170g of three kinds of granules, uniformly mixed as refiner;

[0043] 5. Alloy pouring and testing.

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Abstract

The invention relates to a rare-earth refiner used for K4169 superalloy, and preparation and application methods thereof. According to the invention, matching between rare earth intermetallic compounds and parent metals of superalloy is systematically studied; interfaces between the compounds and the parent metals are constructed by using a low-cost argon-arc welding method, and refinement of dendrite growth in a melting region by a chemical refiner and inhibition behaviors of the chemical refiner are observed through the interface; thus, based on the observation, four rare earth intermetallic compounds are molten and prepared as refiners for the superalloy.

Description

technical field [0001] The invention belongs to a rare-earth refining agent for high-temperature alloys, and relates to a rare-earth refining agent for K4169 superalloy and a preparation and use method. Background technique [0002] Superalloys are key materials for various high-temperature components in aero-engines, and high-temperature corrosion-resistant components required by industrial gas turbines, energy, and chemical industries. Therefore, they are an indispensable class of important materials in national defense modernization and economic construction. [0003] Conventional investment casting superalloys have coarse grains and uneven structures, resulting in low yield strength and low cycle fatigue properties of the material, as well as poor hot workability, which affects the application of superalloy castings. While the macroscopic grain size of the fine-grain cast superalloy is reduced, the grain shape also changes from dendritic to cellular and spherical. In add...

Claims

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Application Information

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IPC IPC(8): C22C30/00B22D27/20
Inventor 赵志龙刘瑞瑞崔凯高建军韦路锋刘树磊王少毅李宁
Owner NORTHWESTERN POLYTECHNICAL UNIV