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Method for predicting freckle formation tendency of single-crystal high-temperature alloy

A technology of superalloy and prediction method, applied in measuring devices, specific gravity measurement, instruments, etc., can solve problems such as the limitation and accuracy of criteria, and the inability to accurately predict the tendency of freckles to form.

Pending Publication Date: 2022-01-11
WEIFANG UNIV OF SCI & TECH
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  • Description
  • Claims
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Problems solved by technology

At present, people mostly use the method of Reynolds number criterion, dendrite spacing value, solidification temperature range, and the difference between alloy solute and melt density measured at room temperature to predict the formation tendency of freckles, but the relevant criteria still have limitations and accuracy. problem, it is not yet possible to accurately predict the tendency of intrinsic freckle formation in single crystal superalloys with different compositions

Method used

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  • Method for predicting freckle formation tendency of single-crystal high-temperature alloy
  • Method for predicting freckle formation tendency of single-crystal high-temperature alloy
  • Method for predicting freckle formation tendency of single-crystal high-temperature alloy

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Experimental program
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Effect test

Embodiment 1

[0027] The single crystal alloy is the third-generation single crystal superalloy DD33, the composition of the master alloy is Cr3.8Co94Mo1.3W10Ta3.5Al5Re2Nb1, and the balance is Ni (mass percentage). The diameter of the single crystal test rod is 16 mm, the length is 300 mm, and the number of test rods is 6; the directional solidification process is: the temperature of the holding furnace is 1520 ° C, the pouring temperature is 1520 ° C, and the pulling speed is 3 mm / min.

[0028] 1) Electronic probes are used to accurately measure the interdendritic composition of single crystals. The measurement section is at the middle height of the single crystal test bar (155 mm from the top of the test bar). There are 10 measurement points, and the final interdendritic composition is averaged value, see Table 1;

[0029] 2), use JMatPro software to calculate the density difference of master alloy melt and interdendritic composition alloy with temperature change, see figure 1 ;

[0030...

Embodiment 2

[0033] The single crystal alloy is the first generation single crystal superalloy DD413, the composition of the master alloy is Cr12Co9Mo2W4Ta5Al4, and the balance is Ni (mass percentage). The diameter of the single crystal test rod is 16 mm, the length is 300 mm, and the number of test rods is 6; the directional solidification process is: the temperature of the holding furnace is 1480 ° C, the pouring temperature is 1520 ° C, and the pulling speed is 3 mm / min.

[0034] 1) Electronic probes are used to accurately measure the interdendritic composition of single crystals. The measurement section is at the middle height of the single crystal test bar (155 mm from the top of the test bar). There are 10 measurement points, and the final interdendritic composition is averaged value;

[0035] 2), use JMatPro software to calculate the density difference of master alloy melt and interdendritic composition alloy with temperature change, see figure 2 ;

[0036] 3) Using a differentia...

Embodiment 3

[0039] The single crystal alloy is the fourth generation single crystal superalloy TMS-138, the composition of the master alloy is Cr3Co8Mo1.51W5.5Ta8Al6Re5Ru3, and the balance is Ni (mass percentage). The diameter of the single crystal test rod is 16 mm, the length is 300 mm, and the number of test rods is 6; the directional solidification process is: the temperature of the holding furnace is 1500 ° C, the pouring temperature is 1520 ° C, and the pulling speed is 3 mm / min.

[0040] 1) The electronic probe is used to accurately measure the interdendritic composition of the single crystal. The measurement section is the middle height of the single crystal test bar (155 mm from the top of the test bar). There are 10 measurement points, and the final interdendritic composition is averaged ;

[0041] 2), use JMatPro software to calculate the density difference of master alloy melt and interdendritic composition alloy with temperature change, see image 3 ;

[0042] 3) Using a di...

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Abstract

The invention provides a simple and effective method for predicting the freckle formation tendency of a single-crystal high-temperature alloy, the freckle defect formation tendency can be accurately predicted by using the method, and the method comprises the following specific steps: 1) measuring interdendritic components after directional solidification of the single-crystal high-temperature alloy; 2) calculating the density difference of the master alloy melt and the component alloy in the interdendritic region along with the temperature change; (3) measuring the solidification temperature interval of the single-crystal high-temperature alloy; 4) determining the average value of the density difference in the range from the alloy solidification liquidus temperature to 1500 DEG C; and (5) predicting the freckle formation tendency by adopting the average value of the density difference values obtained in the step (4), wherein the larger the average value of the density difference values is, the larger the freckle formation tendency is, and vice versa. The method solves the problem that in the prior art, the intrinsic freckle forming tendency of the single-crystal high-temperature alloy with different components cannot be accurately predicted.

Description

technical field [0001] The invention belongs to the field of superalloys, in particular to the technical field of solidification defect control of single crystal superalloy blades. Background technique [0002] Nickel-based single crystal superalloys have good room temperature mechanical properties, high temperature mechanical properties, excellent fatigue resistance and oxidation resistance due to the removal of transverse grain boundaries, and are widely used in the manufacture of aero-engines and ground gas turbines. part. The composition of single crystal alloy is relatively complex, and there are more than ten kinds of elements. In addition to W, Mo, Ta, Re and other insoluble elements, it also contains certain Al and Ti. With the improvement of high-temperature properties of alloys, especially in high-generation single-crystal superalloys, the addition of refractory elements Re, W, etc. is also significantly increased. During the directional solidification of single ...

Claims

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Application Information

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IPC IPC(8): G01N9/36G01N33/2028G01N25/04G01N25/20G01N23/00
CPCG01N9/36G01N33/2028G01N25/04G01N25/20G01N23/00G01N2223/604
Inventor 姜卫国董琳李国胜张珊珊李延昭李强王瑞春任玉艳黄宗经
Owner WEIFANG UNIV OF SCI & TECH
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