Method for stabilizing rare earth elements in nickel-based single crystal superalloy

A technology of nickel-based single crystal and rare earth elements, which is applied in the field of stable rare earth element components in nickel-based single crystal alloys, can solve the problems of lower blade yield, weakened performance, surface inclusions, etc., and achieve improved oxidation resistance and high temperature creep resistance Effects of denaturation, stable content of rare earth elements, and reduction of interfacial reactions

Active Publication Date: 2018-01-23
JIANGXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0002] In the process of precision casting nickel-based superalloys, in addition to shrinkage cavities, porosity, and thermal cracks, surface inclusions are a common and difficult to eliminate defect, and inclusions at the inlet and exhaust edges of blades may even make the entire casting scrap
The interface reaction between the alloy and the mold causes the surface of the casting to form sticky sand that cannot be polished, reduces the yield of the blade, and also affects the final composition of the superalloy, weakening its performance, which is not conducive to stabilizing the subsequent processing technology
Theoretically, the problems in the preparation process of precision casting nickel-based superalloys can be improved by adding rare earth elements, but the effect is often not good in production practice

Method used

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  • Method for stabilizing rare earth elements in nickel-based single crystal superalloy
  • Method for stabilizing rare earth elements in nickel-based single crystal superalloy
  • Method for stabilizing rare earth elements in nickel-based single crystal superalloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Prepare a nickel alloy master alloy ingot with the corresponding composition (regardless of the composition of the nickel alloy), and add a certain amount of La and Y elements to it according to the addition amount in Table 1. The content of the rare earth La element is 50ppm, and the content of the rare earth Y element is 100ppm, the content ratio of rare earth La element and rare earth Y element is 1:2, and the casting is prepared by directional solidification process. The contents of rare earth elements in the castings are shown in Table 1. By scanning electron microscope observation, it can be obtained as figure 2 As shown in the image, it can be seen that, compared with the image of adding rare earth Y alone, after the compound addition of rare earth La and Y elements, the degree of interface reaction is higher than that of the single addition of Y element in the prior art figure 1 Lower, the final composition of rare earth elements in nickel alloy castings is mo...

Embodiment 2

[0018] Prepare a master alloy ingot of nickel alloy with corresponding composition, and add a certain amount of La and Y elements in it according to the addition amount in Table 2, the content of rare earth La element is 40ppm, the content of rare earth Y element is 80ppm, and the content of rare earth La element and rare earth Y The element content ratio is 1:2, and the casting is prepared by directional solidification process. The contents of rare earth elements in the castings are shown in Table 2.

[0019] Table 2 Addition and yield of rare earth elements in nickel alloys

[0020]

Embodiment 3

[0022] Prepare a master alloy ingot of a nickel alloy with the corresponding composition, and add a certain amount of La and Y elements in it according to the addition amount in Table 3, the rare earth La element content is 60ppm, the rare earth Y element content is 120ppm, the rare earth La element and the rare earth Y element The element content ratio is 1:2, and the casting is prepared by directional solidification process. The contents of rare earth elements in the castings are shown in Table 3.

[0023] Table 3 Addition and yield of rare earth elements in nickel alloys

[0024]

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Abstract

The invention relates to a method for stabilizing rare earth elements in nickel-based single crystal superalloy. Specifically, the mode of complexly adding the rare earth elements to the nickel-basedsingle crystal superalloy is adopted, wherein the content of the rare earth La element is 50+/-10 ppm, the content of the rare earth Y element is 100+/-20 ppm, and the content ratio of the rare earthLa element to the rare earth Y element is not lower than 1:3 but not higher than 1:2. The interface reaction between the alloy and a mold shell material is reduced, and the content of the rare earth elements in the nickel-based single crystal superalloy is stabilized. According to the method, the interface reaction between the alloy and the mold shell material is effectively reduced by adding a proper amount of the rare earth La element and the rare earth Y element to the nickel-based single crystal superalloy; and thus the content of the rare earth elements in the nickel-based single crystalsuperalloy is stable, the functions of the rear earth elements are brought into play, and the oxidation resistance, high-temperature creep resistance and the like of the nickel-based single crystal superalloy are improved.

Description

technical field [0001] The invention relates to a method for stabilizing the composition of rare earth elements in a nickel-based single-crystal alloy, in particular to a method of compounding rare-earth elements in a nickel-based single-crystal superalloy to stabilize the composition of the rare-earth elements. Background technique [0002] In the process of precision casting nickel-based superalloys, in addition to shrinkage cavities, porosity, and thermal cracks, surface inclusions are a common and difficult to eliminate defect, and inclusions at the inlet and exhaust edges of blades may even make the entire casting scrapped. The interface reaction between the alloy and the mold causes the surface of the casting to form sticky sand that cannot be polished, reduces the yield of the blade, and also affects the final composition of the superalloy, weakening its performance, which is not conducive to stabilizing the subsequent processing technology. In theory, the problems in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C19/03B22D27/04
Inventor 汪航廖金发罗富鑫高鹏哲尚根峰
Owner JIANGXI UNIV OF SCI & TECH
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