Creep life prediction method based on threshold stress and tensile strength

A technology of creep life and tensile strength, which is applied in the field of creep life prediction, can solve the problems of no accurate prediction of creep life, and achieve the effects of wide application capability, high prediction accuracy and simple test

Pending Publication Date: 2021-12-31
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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  • Application Information

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Problems solved by technology

However, there is currently no study combining threshold stress and tensile strength for accurate prediction of creep life

Method used

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  • Creep life prediction method based on threshold stress and tensile strength
  • Creep life prediction method based on threshold stress and tensile strength
  • Creep life prediction method based on threshold stress and tensile strength

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Embodiment

[0044] In this embodiment, the creep life prediction method of the present invention is applied to the creep life prediction of the nickel-based superalloy GH4169 material, including the following steps:

[0045](1) The high temperature tensile test of GH4169 material was carried out at 600°C and 650°C, and the corresponding tensile strengths were 1440MPa and 1255MPa respectively.

[0046] (2) Carry out high-temperature creep tests of GH4169 material under 6 different stress values ​​at 600°C and 650°C, and obtain the corresponding minimum creep rate and the creep life t f . The specific test plan and the obtained test data are shown in Table 1.

[0047] Table 1 GH4169 material creep test scheme and data

[0048]

[0049] (3) Using the formula Linear fit at 600°C and 650°C, respectively Data, the stress value corresponding to the intersection of the fitting line and the X-axis is the threshold stress at this temperature. The threshold stress calculated as figure 1...

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Abstract

The invention discloses a creep life prediction method based on threshold stress and tensile strength, and the method comprises the following steps: 1, carrying out the high-temperature tensile test of a material at different temperatures T, and obtaining the tensile strength sigma b at the corresponding temperature; 2, carrying out a plurality of groups of high-temperature creep tests under different stress conditions at different temperatures to obtain the minimum creep rate and the creep life tf under the corresponding temperature stress conditions; 3, obtaining threshold stress sigma th corresponding to different temperatures according to the minimum creep rate; 4, establishing a function relationship between the threshold stress and the temperature based on the threshold stress sigma th at different temperatures; 5, on the basis of the threshold stress and the tensile strength, establishing a creep life prediction formula; and predicting the creep life under different stress temperature conditions through a creep life prediction formula. According to the method, the common influence of the threshold stress and the tensile strength is considered, the life prediction precision is high, and the extrapolation capability is high.

Description

technical field [0001] The invention relates to a creep life prediction method, in particular to a creep life prediction method based on threshold stress and tensile strength. Background technique [0002] With the continuous improvement of low carbon emissions and high combustion efficiency requirements, high-temperature components are subjected to increasingly severe creep loads, and accurate prediction of their creep life is very important. Due to the excellent creep resistance of superalloys, superalloys are widely used in high temperature components. The excellent creep resistance of superalloys mainly comes from the interaction between a large number of precipitation strengthening phases and dislocations, and the strengthening phase hinders the movement of dislocations to limit the further development of creep deformation. The existence of the strengthening phase makes the alloys such as precipitation strengthening and solid solution strengthening have threshold stres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/18
CPCG01N3/18G01N2203/0003G01N2203/0017G01N2203/0071G01N2203/0073G01N2203/0226G01N2203/0676G01N2203/0694
Inventor 宋迎东赵旭孙志刚牛序铭
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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