Prediction method for wide-temperature-range creep strength of nickel-based superalloy

A nickel-based superalloy, creep strength technology, used in special data processing applications, instruments, electrical digital data processing, etc.

Inactive Publication Date: 2021-07-06
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention can greatly improve the prediction accuracy of the creep strength of the nickel-based superalloy

Method used

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  • Prediction method for wide-temperature-range creep strength of nickel-based superalloy
  • Prediction method for wide-temperature-range creep strength of nickel-based superalloy
  • Prediction method for wide-temperature-range creep strength of nickel-based superalloy

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example

[0046] Example: Nickel-based MAR-M247 superalloy creep rate prediction under a wide range of stress and temperature loads.

[0047] Specific steps: First, the average size of the precipitates in the nickel-based superalloy is 500 nm and the volume fraction is 60% through experimental characterization. The precipitate size distribution map was then obtained by characterization and the standard deviation was obtained by fitting to a log-normal distribution.

[0048] Then, considering the mutual positional relationship between the dislocation slip plane and the center of the precipitation phase, the creep strength of the precipitation phase with a single average size is obtained ( image 3 ).

[0049] Considering the effect of the size distribution of the precipitates, the creep strength of the precipitates ( Figure 4 ). Here, the creep strength calculated by the classical creep strength prediction method is 293 MPa, while the creep strength predicted by the present invention...

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Abstract

The invention discloses a prediction method for wide-temperature-range creep strength of nickel-based superalloy. The problems that the creep rate and the creep life of the nickel-based superalloy are not accurately predicted under the large-range temperature and stress load are effectively solved. According to a relative position relationship between a central plane of a precipitated phase and a dislocation slippage plane in the nickel-based high-temperature alloy, a probability-dependent creep strength prediction method of a single precipitated phase is provided. Then the size distribution effect of the precipitated phase is considered, and based on the distribution of a creep strengthening mechanism induced by the size distribution effect of the precipitated phase, a statistical dependency creep strength prediction method is proposed. And then the predicted creep strength is substituted into a creep rate calculation method, and compared with the creep rate predicted by classical creep strength, the method can more accurately predict the creep rate under large-range stress and temperature load. According to the method, a large number of repeated tests and waste of manpower, material resources and financial resources are avoided. The time cost is saved, the research and development period of the nickel-based superalloy is shortened, the engineering application reliability of the nickel-based superalloy material is improved, and the scientific research value and the engineering application value are huge.

Description

technical field [0001] The invention relates to the field of creep strength prediction of nickel-based superalloys, and in particular relates to a kind of creep that takes into account the size distribution of precipitates and the relative positional relationship between the dislocation slip plane and the center of the precipitates, coupled with cutting, bypassing and climbing mechanisms Intensity prediction method. Background technique [0002] With the development of aero-engines in the direction of large-scale, high thrust-to-weight ratio and high efficiency, the gas temperature at the front end of the turbine continues to increase, and the working environment of components is getting worse, requiring key components such as turbine disks and turbine blades to have excellent creep resistance. Nickel-based superalloys can maintain good strength, creep properties, fatigue properties, oxidation resistance and corrosion resistance in high temperature environments, and are curr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F113/26
CPCG06F30/20G06F2113/26
Inventor 方棋洪李甲李理
Owner HUNAN UNIV
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