Method for quantitatively evaluating service life of material

A quantitative evaluation and life-span technology, applied in the direction of analyzing materials, applying stable tension/pressure to test the strength of materials, measuring devices, etc., can solve the problems of inability to grasp the life status of metal parts, increase safety hazards, and take a long time to achieve Convenient and quick quantitative evaluation, solving the effects of long time-consuming and short time-consuming

Pending Publication Date: 2021-03-16
润电能源科学技术有限公司
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Problems solved by technology

[0003] At present, the traditional life evaluation method requires cutting the pipe after the power plant is shut down, and conducting a durable test on the cut pipe to evaluate the life of the material. Even if the accelerated method is used for the durable test, in order to ensure the accuracy requirements, the test time cannot be less than 3000 hours. longer time
The maintenance period of power plants is generally very short (about 1 month), and the test is not over when the maintenance period ends. The power plant cannot get the test results before the maintenance period ends, and cannot grasp the life status of metal parts, and cannot take corresponding measures. This increases the safety hazard after the unit is running

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  • Method for quantitatively evaluating service life of material
  • Method for quantitatively evaluating service life of material

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Experimental program
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Embodiment 1

[0060] The aging level and life loss of pearlitic heat-resistant steel 12Cr1MoV are mathematically fitted. Table 1 shows the remaining life of samples with different aging levels:

[0061] Table 1 Durable life of different aging grades of 12Cr1MoV

[0062]

[0063] Fit the aging level and the life loss to obtain the functional relationship f(i,Ф) between the two, such as figure 2 shown.

Embodiment 2

[0065] The life evaluation method for the martensitic heat-resistant steel T91 heating surface pipeline in service in the power plant is as follows:

[0066] Select unworn T91 samples and T91 samples with aging levels of 1 to 5 (according to DLT 884-2019 "Technical Guidelines for Metallographic Inspection and Evaluation of Thermal Power Plants" for aging level assessment) to conduct high-temperature endurance strength tests, high-temperature strength The temperature during the endurance test is 570°C, and the high-temperature endurance strength test is carried out under the conditions of pressures of 100MPa, 110MPa, 120MPa, 150MPa, 160MPa and 190MPa respectively, and the fracture time of the unworn samples and samples of different aging levels under different pressures are obtained , to establish the functional relationship between sample stress and fracture time, this function is the creep equation of samples with different aging levels.

[0067] Knowing the pipeline specific...

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Abstract

The invention provides a method for quantitatively evaluating the service life of a material. The method comprises the following steps of determining the service life of an unconsumed sample and the service life loss of samples with different aging levels, performing mathematical fitting on the aging level and the service life loss to obtain a function relationship, carrying out aging rating on the to-be-detected sample, and substituting the obtained aging rating result into the function relationship to obtain a service life loss result, wherein the sample and the to-be-detected sample have the same components. On the basis of establishing the function relationship between the aging level and the service life loss, the metallographic structure of the material is subjected to aging rating on site, so that the residual life of the metal material serving under specific conditions is quantitatively evaluated, technicians are guided to master the service life condition of the high-temperature metal component, and an operation and maintenance strategy is formulated on the basis. Compared with a traditional method, the method has the advantages that the service life of the material can bequantitatively evaluated conveniently and quickly, so that the problem of long time consumption of a service life evaluation test is solved, and the method is simple, low in cost and short in time consumption.

Description

technical field [0001] The invention belongs to the technical field of life evaluation, in particular to a method for quantitatively evaluating the life of materials. Background technique [0002] Creep damage will occur when metal materials are in service at temperatures higher than 450 °C. The high-temperature life of metal materials mainly refers to creep life, and creep life refers to the time for materials to undergo creep rupture at a specific temperature and constant stress. At present, the calculation method of creep life generally adopts the cutting tube to carry out the high temperature endurance test. Since the design life of the furnace tube is generally 30 years, and it is unrealistic to carry out the creep test for 30 years, it is actually carried out by increasing the temperature or stress. Accelerated testing followed by extrapolation for lifetime prediction. Commonly used calculation methods mainly include isotherm extrapolation method, time-temperature par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/18
CPCG01N3/18G01N2203/0067G01N2203/0226G01N2203/0676G01N2203/0688
Inventor 肖国华张小霓周杰马东方李世涛
Owner 润电能源科学技术有限公司
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