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High-temperature creep deformation prediction method

A technology of high-temperature creep and prediction methods, which is applied to measuring devices, using stable tension/pressure to test the strength of materials, instruments, etc., can solve problems such as influence and dispersion of material properties, and achieve shortening experiment time and solving volatility large, improved accuracy and stability effects

Active Publication Date: 2016-07-27
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the prediction results of high temperature creep deformation of existing materials are affected by the dispersion of material properties, improve the accuracy and stability of prediction results, and reduce the volatility of high temperature creep deformation prediction

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0054] A specific scheme of a high-temperature creep deformation prediction method based on a short-time creep experiment in the present invention is given in detail by the following examples.

[0055] Select P92 to carry out experiments and life prediction, including the following steps:

[0056] 1) Respectively at 575℃ 1 under, 235MPa 8 ;600℃ 2 under, 215MPa 6 ,225MPa 7 ;650℃ 3 under, 125MPa 1 ,135MPa 2 ,150MPa 3 ,165MPa 4 ,175MPa 5 ; Carry out the creep test and obtain as figure 1 The creep experimental data are shown. The temperature fluctuation during the experiment is less than 1°C; the strain range of the creep experiment data is 0.1%-20%, and the creep experiment data is the sample deformation value and the time corresponding to the sample deformation value.

[0057] 2) Select different creep strains from small to large creep strains according to the creep experimental data in each creep experiment in step 1), namely: 0.5% 1 ,1% 2 , 4% 3 , 7% 4 , 10% 5...

Embodiment 2

[0071] A specific scheme of a high-temperature creep deformation prediction method based on a short-time creep experiment in the present invention is given in detail by the following examples.

[0072] Select P92 steel to carry out experiments and life prediction, including the following steps:

[0073] 1) Respectively at 575℃ 1 under, 235MPa 8 ;600℃ 2 under, 215MPa6 ,225MPa 7 ;650℃ 3 Under, 125MPa 1 ,135MPa 2 ,150MPa 3 ,165MPa 4 ,175MPa 5 ; Carried out the creep experiment, obtained as Image 6 The creep test data are shown. The temperature fluctuation during the experiment is less than 1°C; the strain range of the creep test data is 0.1%-20%, and the creep test data is the deformation value of the sample and the time corresponding to the deformation value of the sample.

[0074] 2) The creep experiment data in each creep experiment in step 1) is selected different creep strains according to the creep strain from small to large, namely: 0.5% 1 ,1% 2 , 4% 3 , 7% ...

Embodiment 3

[0088] The specific scheme of a high-temperature creep deformation prediction method based on short-term creep experiments in the present invention is given in detail by the following examples.

[0089] Select HP heat-resistant steel to carry out experiments and life prediction, including the following steps:

[0090] 1) respectively at 1000℃ 1 lower, 32MPa 1 、35MPa 2 、37MPa 3 、38MPa 4 ;980°C 2 lower, 42MPa 5 ;950℃ 3 Below, 50MPa 6 ,900℃ 4 ,60MPa 7 ; The creep test was carried out, and the obtained results were as follows: Figure 11 Creep test data shown. The temperature fluctuation during the experiment is less than 1°C; the strain range of the creep test data is 0.1%-20%, and the creep test data is the deformation value of the sample and the time corresponding to the deformation value of the sample.

[0091] 2) The creep experiment data in each creep experiment in step 1) is selected different creep strains according to the creep strain from small to large, name...

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Abstract

The invention discloses a high-temperature creep deformation prediction method which comprises the following steps: performing short-duration test on a target sample, introducing a comprehensive parameter Q, establishing a sigma-Q relation model, and further realizing high-temperature creep deformation prediction of the target sample. The invention provides a brand new creep deformation prediction method. According to the method, change of creep deformation of a creep experiment in the solved stress along with time nearby the known stress can be predicted by utilizing the creep experiment under a certain known stress; according to the method disclosed by the invention, prediction can be performed based on a short-duration experimental result, and the experimental time in the actual experimental process is shortened; and moreover, the problem in the prior art that the test result fluctuation is large is effectively solved, due to the method disclosed by the invention, a reasonable prediction result can be obtained under the condition that the material property dispersion is large, and the accuracy and the stability of the prediction result are improved.

Description

technical field [0001] The invention relates to a method for predicting high-temperature creep, in particular to a method for predicting high-temperature creep deformation of materials based on short-term high-temperature creep data. Background technique [0002] High-temperature creep deformation refers to the slow plastic deformation of materials at high temperatures and stresses below the macroscopic yield limit of materials, which describes the ability of materials to resist high-temperature deformation. In the service environment of high temperature and high pressure, the stability of heat-resistant steel is an important guarantee for the safe operation of high-temperature structural parts. High temperature creep deformation is one of the main forms leading to failure of high temperature components. Therefore, it is necessary to efficiently and accurately analyze and predict the creep deformation behavior of heat-resistant steel. [0003] The traditional high-temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/18
CPCG01N3/18G01N2203/0071
Inventor 赵杰程从前李会芳曹铁山闵小华
Owner DALIAN UNIV OF TECH
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