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A Method for Characterizing γ/γ′ Phase Lattice Mismatch Degree in Nickel-based Superalloys

A technology of nickel-based superalloy and lattice mismatch, which is applied in the direction of material analysis using radiation diffraction, etc., can solve the problems of expensive, complicated and cumbersome sample preparation, etc., and achieve simple sample preparation, convenient operation and reduced error Effect

Active Publication Date: 2015-10-28
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it can be seen from the name that these instruments are high-precision equipment, which are very complicated and expensive, and some methods of sample preparation are also relatively complicated and cumbersome, such as converging electron beam and characterization under transmission electron microscope.

Method used

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  • A Method for Characterizing γ/γ′ Phase Lattice Mismatch Degree in Nickel-based Superalloys
  • A Method for Characterizing γ/γ′ Phase Lattice Mismatch Degree in Nickel-based Superalloys
  • A Method for Characterizing γ/γ′ Phase Lattice Mismatch Degree in Nickel-based Superalloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This method was used to test and characterize the solid DD483 (C 0.07, Cr 12.26, Mo 1.99, Co 9.19, W 3.76, Al 3.48, Ti 4.00, Ta 4.86, B 0.015, other Ni, wt.%) single crystal superalloy The lattice mismatch of γ / γ' two phases, the test and characterization process is as follows:

[0042] S1 first performs a θ-2θ linkage scan on the sample, the scanning step is 0.002°, the scanning speed is 0.25° / min, and the diffraction range of the (002) plane of the crystal is determined to be 50° to 52°;

[0043] S2 then equally divides the detector's 2θ angle range (50~52°) with a step length of 0.02°, which is 100 equal parts;

[0044] S3 fixes the 2θ angle, performs ω scan, sets the ω angle (rotation angle of the sample stage) within ±2°, the step length is 0.008°, and the scanning speed is 4° / min; record ω, 2θ and intensity values;

[0045] S4 normalizes the diffraction intensity, imports the three sets of data into matlab software, and obtains the corresponding three-dimensional map;

[0...

Embodiment 2

[0070] This method is used to test and characterize the lattice mismatch of the γ / γ' two-phase in the heat-treated DD483 single crystal superalloy. The heat treatment system is 1,204℃ / 1h+1,265℃ / 1h / air cooling+1,084℃ / 4h / furnace cooling. The test characterization process is the same as in Example 1, and the test results are shown in Table 2. In the alloy of this example, the amount of Cr+Co+Mo reached 23.44wt%, and the content of Ta+W was 8.62wt%, so the heat treatment process makes the amount of alloying elements diffuse into the middle γ'phase greater than those diffused into the γ phase Quantities, make the lattice mismatch increase in the direction, and the test characterization results are the same.

[0071] Table 2 The lattice constants and mismatches of the γ / γ′ phases of the heat-treated samples

[0072] Lattice constant and mismatch

Embodiment 3

[0074] This method was used to test and characterize the lattice mismatch of the γ / γ' two phases in the creep DD483 single crystal superalloy. The sample was taken from the creep rupture at a distance of 5 cm from the fracture opening, and the observation surface was perpendicular to the creep tensile stress , Is the (002) plane, the creep condition is 982°C / 250MPa, the test and characterization process is the same as in Example 1, and the test results are shown in Table 3. The literature Acta Metall Mater 1991; 39:2783-94 used a twin crystal diffractometer to study the two-phase mismatch of the (002) plane of the single crystal SRR99 alloy after heat treatment and creep. It changed from -0.14 after heat treatment to that after creep. 0.04, the change trend is consistent with that of the alloy in this example, indicating that the test result of the test method is correct.

[0075] Table 3 The lattice constants and mismatches of the γ / γ′ phases of the creep samples

[0076] Lat...

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Abstract

The invention relates to a method for expressing the gamma / gamma' phase crystal lattice mismatching degree in nickel-based high-temperature alloy. According to the method, conventional diffraction and omega swinging curve testing technologies are combined, a two-dimensional scanning mode is obtained, an isostrength map of diffraction information is expressed by a two-dimensional positive space or reverse space, the position of the diffracted crystal surface is obtained, the crystal lattice constant of the diffracted crystals is obtained, then, the two-phase mismatching degree is calculated according to the crystal lattice constant, the crystal lattice constant and the mismatching degree determined in the mode have better mean value significance, errors are reduced to the maximum degree, and higher accuracy is realized. The method provided by the invention has the advantages that the sample preparation is simple, the operation is convenient, the in-situ measurement of blocky solid can be realized, in addition, the samples rotate, the diffraction regions are increased, or even an embedded structure is reflected out, the requirement on equipment is not high, used x-ray equipment only needs to be capable of realizing the independent rotation of an incidence angle (samples) and an diffraction angle, the smaller distribution divergence of diffraction points in the reverse space is the better, and the best distribution is dotted distribution.

Description

Technical field [0001] The invention relates to a method for characterizing the mismatch degree of the γ / γ' phase crystal lattice of a nickel-based superalloy. Background technique [0002] γ'phase is the main strengthening phase in nickel-based superalloys, and its volume fraction accounts for 60-70% in advanced superalloys. It is embedded in the matrix γ phase in a coherent manner. Both of them have a face-centered cubic structure. , Their lattice constants are very close. The lattice constants of γ / γ' two-phase solid solution alloying elements will change, but their lattice constants still change between 0.352~0.364nm, so the two-phase crystal The lattice mismatch is usually only 10 -3 To 10 -2 In the order of magnitude, the diffraction peaks of the two phases overlap after X-ray diffraction, and it is difficult to accurately determine the position of the two-phase diffraction peaks. Therefore, the error of using conventional X-ray diffraction to characterize the degree of mis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/20
Inventor 钟万里梁永纯虞月荣任维丽林介东聂铭丹红兵黄丰
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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