A method and system for multi-dimensional detection and assessment of aging of metal components in a nuclear power plant

Abstract

The application discloses a kind of nuclear power plant metal component aging multidimensional detection and evaluation method and system, comprising: selecting the metal component of nuclear power plant to be detected and evaluated, according to the field environment and detection limit condition, using one or more methods of three kinds of ways of damaging, slightly damaging and non-destructive to multidimensional aging detection and evaluation of component, obtain the aging evaluation result of service metal component.The application realizes the multidimensional detection and evaluation of nuclear power plant metal component aging, masters its performance change and damage condition in service process, provides technical support for nuclear power plant aging management, life evaluation and life extension.

Description

Technical Field

[0001] This invention relates to the field of detection and evaluation technology for the aging of metal components in nuclear power plants, and particularly to a multidimensional detection and evaluation method and system for the aging of metal components in nuclear power plants. Background Technology

[0002] With the increasing number of aging nuclear power plants in my country and the demonstration and application of new-generation nuclear power technologies, there is an urgent need for a comprehensive and effective assessment of the aging and performance degradation of key nuclear energy structures caused by harsh environments such as irradiation, high temperature, and corrosion, in order to meet the requirements of high-standard safety supervision and license renewal for nuclear power. Currently, routine overhauls mainly focus on non-destructive testing and evaluation of macroscopic defects, and there is still a lack of effective detection and assessment of aging conditions.

[0003] Currently, the mechanical properties of metal components are obtained by destructively sampling leftover materials or witness samples before the components leave the factory, making standard specimens, and then conducting various mechanical tests in the laboratory to obtain the test results. This method can only obtain the performance parameters of the metal components before they are put into service, and cannot grasp the performance changes of the components after they are put into service. At the same time, the commonly used non-destructive testing methods in nuclear power plants (such as ultrasonic, X-ray and penetrant testing) are intended to detect dangerous parts in the components or detect defects and dimensions, but they cannot evaluate the mechanical properties of the component materials. Summary of the Invention

[0004] One of the objectives of this invention is to propose a multi-dimensional detection and evaluation method for the aging of metal components in nuclear power plants. This method enables multi-dimensional detection and evaluation of the aging of metal components in nuclear power plants, allowing for the understanding of performance changes and damage conditions during their service life, and providing technical support for aging management, life assessment, and life extension in nuclear power plants.

[0005] The technical solution for realizing the present invention is:

[0006] A multi-dimensional detection and evaluation method for the aging of metal components in nuclear power plants includes the following steps:

[0007] S1. Select an aging test method for metal components in nuclear power plants. The test method includes, but is not limited to, any one or both of micro-destructive testing and non-destructive testing.

[0008] S2. Calculate the impact energy value of metal components after aging in service;

[0009] (1) For micro-destructive testing, obtain the aging time, testing parameters, and material parameters of the metal component to be inspected; the testing parameters include the microhardness value; the material parameters include the saturated microhardness value. 、 Initial microhardness value, saturated impact energy, initial impact energy, impact energy characteristic parameters, and microhardness characteristic parameters;

[0010] The impact energy value of service-grade metal components after aging is calculated using the following method:

[0011]

[0012] ,

[0013] in, HV This is the microhardness value. HV sat This represents the saturated microhardness value. HV int This is the initial microhardness value. t For aging time, M H for HV sat and HV int The logarithm of the mean 10 t-value; CV 1 The impact energy obtained from micro-destructive testing. CV sat For saturated impact energy, CV int The initial impact energy, CV 0 These are characteristic parameters of impact energy. HV 0 These are characteristic parameters of microhardness;

[0014] (2) For non-destructive testing, the aging time, testing parameters and material parameters of the metal component to be inspected are obtained; the testing parameters include the thermoelectric potential value of the surface of the metal component; the material parameters include saturated impact energy, initial impact energy, initial thermoelectric potential value and material thermoelectric parameters;

[0015] The impact energy value of service-grade metal components after aging is calculated using the following method:

[0016] ,

[0017] in, TEP This is the thermoelectric potential value. TEP int The initial value of the thermoelectric potential, S For the thermoelectric parameters of the material, M CV for CV sat and CV int The mean corresponding TEP value; CV 2 represents the impact energy obtained from non-destructive testing; CVsat represents the saturated impact energy; CVint represents the initial impact energy.

[0018] S3. Based on the impact energy values ​​of the service metal components after aging obtained from micro-destructive or non-destructive testing, obtain the aging assessment results of the service metal components: When only one of the above two testing methods is selected, the aging assessment of the service metal components takes the result of one testing method; when both testing methods are selected, the aging assessment of the service metal components takes the conservative value of the results of both testing methods, i.e., the minimum value CV=MIN. CV 1, CV 2).

[0019] Preferably, the aging detection method for nuclear power plant metal components in step S1 further includes destructive testing; in step S2, for destructive testing, mechanical property samples are taken and processed from the surface of the metal component to be inspected, and destructive testing is carried out in the laboratory using a testing system. The impact energy value of the aged metal component is obtained based on the results of the destructive testing. CV 3; When only one of the three testing methods—micro-destructive testing, non-destructive testing, and destructive monitoring—is selected, the aging assessment of in-service metal components takes the result of that one testing method; when two or three of the above testing methods are selected, the aging assessment of in-service metal components takes a conservative value of the results of the above two or three testing methods, i.e., the minimum value CV=MIN. CV 1, CV 2, CV 3).

[0020] Preferably, in step S2, the method for obtaining the micro-destructive testing parameters is as follows:

[0021] Pressure is applied to the ferrite surface of a metal part using an indentation probe and maintained under load; the pressure parameters of the indentation probe are recorded. After the indentation probe is unloaded, the size of the indentation on the ferrite is observed and measured using an optical microscope, and the indentation size parameters are recorded. Based on the indentation size parameters, the microhardness value is calculated.

[0022] ,

[0023] In the formula, d 1、 d 2 represents the diagonal length of the indentation.

[0024] Preferably, in step S2, the method for obtaining the nondestructive testing parameters is as follows:

[0025] The cold-end probe is kept in constant contact with the surface of the component under test. The hot-end probe is heated and moved vertically and horizontally on the surface of the component to make contact and measure at different measurement points. The thermoelectric potential detection parameter value is recorded, where the thermoelectric potential detection parameter value TEP = ΔV / ΔT, ΔV is the voltage difference and ΔT is the temperature difference.

[0026] The second objective of this invention is to provide a multi-dimensional detection and evaluation system for the aging of metal components in nuclear power plants.

[0027] A multi-dimensional detection and evaluation system for the aging of metal components in nuclear power plants, comprising a comprehensive evaluation module, a micro-destructive testing subsystem, and a non-destructive testing subsystem; wherein:

[0028] The comprehensive evaluation module is used to select the detection method for the aging of metal components in nuclear power plants. The detection method can be any one or two of the following: micro-destructive testing and non-destructive testing. The module then comprehensively evaluates the results of the detection methods to obtain the aging assessment result of the metal components in service. When only one of the two detection methods is selected, the aging assessment of the metal components in service is based on the result of that one detection method. When both detection methods are selected, the aging assessment of the metal components in service is based on a conservative value, i.e., the minimum value, of the results of the two detection methods.

[0029] The micro-destructive testing subsystem is used to perform micro-destructive testing on metal components of nuclear power plants; it includes a data acquisition module and a micro-destructive testing model; the data acquisition module is used to acquire the aging time, testing parameters, and material parameters of the metal components to be inspected, including microhardness values ​​and saturated microhardness values. 、 Initial microhardness value, saturated impact energy, initial impact energy, impact energy characteristic parameters, and microhardness characteristic parameters; the micro-damage testing model is used to calculate the impact energy value of service metal components after aging, and the calculation method is as follows:

[0030]

[0031] ,

[0032] in, HV This is the microhardness value. HV sat This represents the saturated microhardness value. HV int This is the initial microhardness value. t For aging time, M H for HV sat and HV int The logarithm of the mean 10 t-value; CV 1 The impact energy obtained from micro-destructive testing. CV sat For saturated impact energy, CV int This is the initial impact energy; CV 0These are characteristic parameters of impact energy. HV 0 These are characteristic parameters of microhardness;

[0033] The non-destructive testing subsystem is used to perform non-destructive testing on metal components of nuclear power plants. It includes a data acquisition module and a non-destructive testing model. The data acquisition module acquires the aging time, testing parameters, and material parameters of the in-service metal components to be inspected. The testing parameters include the thermoelectric potential value of the metal component surface, and the material parameters include saturated impact energy, initial impact energy, initial thermoelectric potential value, and material thermoelectric parameters. The non-destructive testing model calculates the impact energy value of the in-service metal components after aging. The calculation method is as follows:

[0034] ,

[0035] in, CV 2 represents the impact energy obtained through non-destructive testing. CV int The initial impact energy, TEP This is the thermoelectric potential value. TEP int The initial value of the thermoelectric potential, S For the thermoelectric parameters of the material, M CV for CV sat and CV int The mean corresponding TEP value.

[0036] Preferably, the multidimensional detection and evaluation system further includes a destructive testing subsystem;

[0037] The destructive testing subsystem is used to record the impact energy values ​​of the component materials obtained after destructive testing of in-service metal components. CV 3;

[0038] The comprehensive evaluation module provides one or more of the following detection methods: micro-destructive testing, non-destructive testing, and destructive testing. When comprehensively evaluating the results of the detection methods, if only one of the above three detection methods is selected, the aging assessment of the in-service metal components takes the result of that method; if two or three of the above three detection methods are selected, the aging assessment of the in-service metal components takes a conservative value of the results of the above two or three detection methods, i.e., the minimum value CV=MIN. CV 1, CV 2, CV 3).

[0039] Preferably, the data acquisition module of the micro-destructive testing subsystem further includes an indentation probe and an optical microscope. The indentation probe is used to apply pressure to and maintain the load on the ferrite surface of the metal component to be inspected. The optical microscope is used to observe and measure the indentation size of the indentation probe on the ferrite to obtain the microhardness value. The micro-destructive testing model is installed on the measurement workstation, and the data acquisition module transmits the acquired data to the micro-destructive testing model.

[0040] Preferably, the data acquisition module of the non-destructive testing subsystem further includes a hot probe and a cold probe. The hot probe and the cold probe are used to measure the thermoelectric potential value of the surface of the metal component to be inspected. During use, the cold probe is kept in contact with the surface of the component to be inspected, and the hot probe is heated and moved vertically and horizontally on the surface of the component to make contact and measure at different measurement points. The non-destructive testing model is installed on the measurement workstation, and the data acquisition module transmits the acquired thermoelectric potential value to the non-destructive testing model.

[0041] The advantages of this invention compared to the prior art are:

[0042] (1) The present invention adopts a multi-dimensional detection and evaluation method and system with destructive, micro-destructive and non-destructive methods, and realizes the detection and evaluation of metal parts in different dimensions based on the model relationship of the corresponding detection parameters.

[0043] (2) The multidimensional detection and evaluation methods and systems used in this invention are all aimed at metal parts in service on site, and realize the accurate detection of mechanical performance indicators of the equipment in service. This is crucial for correctly evaluating the safety of the equipment in service. Attached Figure Description

[0044] Figure 1 This is a flowchart of a multi-dimensional detection and evaluation method for aging of metal components in nuclear power plants according to the present invention;

[0045] Figure 2 This is a schematic diagram of the micro-destructive testing subsystem;

[0046] Figure 3 This is a schematic diagram of the non-destructive testing subsystem;

[0047] Figure 4 for CV / CV int - HV / HV int picture;

[0048] Figure 5 for CV / CV int – TEP / TEP int picture.

[0049] In the figure, 1. Metal pipe component; 2. Measurement workstation; 3. Micro-destructive testing subsystem; 4. Micro-destructive testing indentation probe; 5. Non-destructive testing subsystem; 6. Non-destructive testing subsystem hot end probe; 7. Non-destructive testing subsystem cold end probe. Detailed Implementation

[0050] The technical solution provided by the present invention will be further described below with reference to the accompanying drawings.

[0051] Impact energy is an indicator of a material's ability to absorb energy when subjected to impact. In engineering applications, impact energy is a core parameter for quantifying the toughness of metallic materials, defined as the impact energy consumed per unit cross-sectional area at the notch when the specimen fractures under impact load. As materials age, their impact energy typically decreases, indicating a reduction in toughness and impact resistance. This invention can obtain the impact energy of in-service metal components through destructive, micro-destructive, or non-destructive testing and evaluation methods, thereby assessing the aging condition of these components.

[0052] This invention first provides a multi-dimensional detection and evaluation method for the aging of metal components in nuclear power plants, see [link to relevant documentation]. Figure 1 As shown, it includes the following steps:

[0053] S1. Select a testing method for the aging of metal components in nuclear power plants. The testing method may be one or more of destructive testing, micro-destructive testing, and non-destructive testing, and can be selected according to the site environment and testing limitations.

[0054] S2. Conduct testing and evaluation based on the selected testing and evaluation methods;

[0055] (1) For destructive testing, the testing evaluation method is as follows:

[0056] Mechanical property samples were taken and processed from the surface of the metal components to be inspected. Destructive testing was carried out in the laboratory using a testing system. The impact energy value of the metal components after aging was obtained based on the results of the destructive testing. CV 3.

[0057] Destructive testing is a mature testing method. When conducting destructive testing in the laboratory to obtain impact energy, please refer to the "Charpy Pendulum Impact Test Method for Metallic Materials" (GB / T 229-2020).

[0058] (2) For micro-destructive testing, the testing and evaluation methods are as follows:

[0059] Acquire the aging time, testing parameters, and material parameters of the metal component to be inspected; the testing parameters include, but are not limited to, microhardness values; the material parameters include, but are not limited to, saturated microhardness values. 、 Initial microhardness value, saturated impact energy, initial impact energy, impact energy characteristic parameters, and microhardness characteristic parameters;

[0060] The above-mentioned detection parameters can be obtained by the following method: First, apply pressure to the ferrite on the surface of the metal part using an indentation probe and hold the load (e.g., apply a pressure of 0.98 N and hold the load for 10 seconds), and record the pressure parameters of the indentation probe; then, after unloading the indentation probe, use an optical microscope to observe and measure the size of the indentation on the ferrite, and record the indentation size parameters (diagonal length of the indentation). d 1 and d 2) The microhardness values ​​are as follows:

[0061] ,

[0062] The saturated microhardness value, saturated impact energy, impact energy characteristic parameter, and microhardness characteristic parameter among the above material parameters are obtained by conducting accelerated aging tests on the sample materials in the laboratory; the initial microhardness value and initial impact energy can be obtained from the material handbook or the completion report.

[0063] The method for calculating the impact energy of service-grade metal components after aging is as follows:

[0064]

[0065] ,

[0066] in, HV This is the microhardness value. HV sat This represents the saturated microhardness value. HV int This is the initial microhardness value. t For aging time, M H for HV sat and HV int The logarithm of the mean 10 t-value; CV 1 The impact energy obtained from micro-destructive testing. CV sat For saturated impact energy, CV int This is the initial impact energy; CV 0 These are characteristic parameters of impact energy. HV 0 These are characteristic parameters of microhardness;

[0067] (3) For non-destructive testing, the testing evaluation method is as follows:

[0068] Acquire the aging time, testing parameters, and material parameters of the metal component to be inspected; the testing parameters include, but are not limited to, thermoelectric potential values; the material parameters include, but are not limited to, saturated impact energy, initial impact energy, initial thermoelectric potential values, and material thermoelectric parameters.

[0069] The above-mentioned detection parameters can be obtained by the following method: using a cold-end probe to keep in constant contact with the surface of the component under test, and then moving the hot-end probe vertically and horizontally across the surface of the component after heating, making contact and measuring at different measurement points, and recording the thermoelectric potential detection parameter values, where the thermoelectric potential detection parameter value TEP = ΔV / ΔT, ΔV is the voltage difference, and ΔT is the temperature difference. See the article "Research on Non-destructive Testing and Evaluation Methods for Thermal Aging of CF-8M Cast Stainless Steel" (Journal of Atomic Energy Science and Technology, Vol. 56, No. 10, 2022, pp. 2232-2238).

[0070] The above material parameters were obtained by conducting accelerated aging tests on the sample materials in the laboratory.

[0071] The impact energy value of service-grade metal components after aging is calculated using the following method:

[0072] ,

[0073] in, TEP This is the thermoelectric potential value. TEP int The initial value of the thermoelectric potential, S For the thermoelectric parameters of the material, M CV for CV sat and CV int The mean corresponding TEP value; CV 2 represents the impact energy obtained from non-destructive testing; CVsat represents the saturated impact energy, and CVint represents the initial impact energy.

[0074] (4) Obtain the aging assessment results of the service metal components based on one or more of the following testing methods: destructive testing, micro-destructive testing, or non-destructive testing; when only one of the above three testing methods is selected, the aging assessment of the service metal components takes the result of one testing method; when two or three of the above three testing methods are selected, the aging assessment of the service metal components takes a conservative value of the results of the above two or three testing methods, i.e., the minimum value CV=MIN( CV 1, CV 2, CV 3).

[0075] This invention also provides a multi-dimensional detection and evaluation system for the aging of metal components in nuclear power plants. The system includes a comprehensive evaluation module, a destructive testing subsystem, a micro-destructive testing subsystem, and a non-destructive testing subsystem. A schematic diagram of the micro-destructive testing subsystem is shown below. Figure 2 As shown in the diagram, the non-destructive testing subsystem is as follows: Figure 3 As shown. Wherein:

[0076] The comprehensive evaluation module is used to select the aging detection and evaluation method for metal components in nuclear power plants. This method can be one or more of destructive testing, micro-destructive testing, and non-destructive testing. It then comprehensively evaluates the results of each evaluation method to obtain the aging evaluation result for the in-service metal components. Specifically, when only one of the three testing methods is selected, the aging evaluation of the in-service metal components uses the result of that single testing method. When two or three of the three testing methods are selected, the aging evaluation of the in-service metal components uses a conservative value of the results of those two or three testing methods, i.e., the minimum value CV = MIN. CV 1, CV 2, CV 3);

[0077] The destructive testing subsystem is used to record the impact energy values ​​of the component materials obtained after destructive testing of in-service metal components. CV 3;

[0078] The micro-destructive testing subsystem is used to perform micro-destructive testing on metal components of nuclear power plants; it includes a data acquisition module and a micro-destructive testing model; the data acquisition module is used to acquire the aging time and microhardness value of the metal components to be inspected; the micro-destructive testing model is used to calculate the impact energy value of the aged metal components, and the calculation method is as follows:

[0079]

[0080] ,

[0081] in, HV This is the microhardness value. HV sat This represents the saturated microhardness value. HV int This is the initial microhardness value. t For aging time, M H for HV sat and HV int The logarithm of the mean 10 t-value; CV 1 The impact energy obtained from micro-destructive testing. CV sat For saturated impact energy,CV int This is the initial impact energy; CV 0 These are characteristic parameters of impact energy. HV 0 These are characteristic parameters of microhardness;

[0082] The non-destructive testing subsystem is used to perform non-destructive testing on metal components of nuclear power plants; it includes a data acquisition module and a non-destructive testing model; the data acquisition module is used to acquire the aging time of the in-service metal component to be inspected and the thermoelectric potential value of the metal component surface; the non-destructive testing model is used to calculate the impact energy value of the in-service metal component after aging, and the calculation method is as follows:

[0083]

[0084] in, TEP This is the thermoelectric potential value. TEP int The initial value of the thermoelectric potential, S For the thermoelectric parameters of the material, M CV for CV sat and CV int The mean corresponding TEP value; CV 2 represents the impact energy obtained from non-destructive testing; CVsat represents the saturated impact energy; CVint represents the initial impact energy.

[0085] The data acquisition module of the micro-destructive testing subsystem further includes an indentation probe and an optical microscope. The indentation probe is used to apply pressure to the ferrite on the surface of the metal component to be inspected and maintain the load. The optical microscope is used to observe and measure the indentation size of the indentation probe on the ferrite to obtain the microhardness value. The micro-destructive testing model is installed on the measurement workstation, and the data acquisition module transmits the acquired data to the micro-destructive testing model.

[0086] The data acquisition module of the non-destructive testing subsystem further includes a hot probe and a cold probe. The hot probe and cold probe are used to measure the thermoelectric potential value of the surface of the metal component to be inspected. During use, the cold probe is kept in contact with the surface of the component, and the hot probe is heated and moved vertically and horizontally on the surface of the component to make contact and measure at different measurement points. The non-destructive testing model is installed on the measurement workstation, and the data acquisition module transmits the acquired thermoelectric potential value to the non-destructive testing model.

[0087] Example 1: Micro-destructive testing and evaluation methods for cast stainless steel CF8M metal parts.

[0088] 1.1 The surface of the metal part to be inspected is etched and polished. The micro-destructive testing subsystem is installed on the part. The indentation probe of the micro-destructive testing subsystem is used to apply pressure to the ferrite on the surface of the metal part and hold it under load. After the indentation probe is unloaded, the size of the indentation on the ferrite is observed and measured using an optical microscope. Figure 2 As shown;

[0089] 1.2 Obtaining the microhardness testing parameters of the micro-destructive testing subsystem HV and initial microhardness material parameters HVint The microhardness value was then normalized. HV / HVint =131%;

[0090] 1.3 Input the microhardness value, a parameter for micro-destructive testing, into the micro-destructive testing model. The model relationship is as follows:

[0091] ,

[0092] in CV sat / CV int =0.22, CV 0 =251.17, HV 0 =0.17.

[0093] 1.4 Based on the above model relationship, the degree of impact energy reduction after aging of service metal components is obtained as follows: CV 1 / CV int =35%.

[0094] 1.5 Relationship curve between micro-damage test values, normalized impact energy and microhardness CV / CV int -HV / HV int like Figure 4 As shown, the impact energy value decreases rapidly in the initial stage with the increase of microhardness value, and then gradually levels off in the later stage. The micro-damage testing and evaluation method proposed in this invention can be used to obtain the impact performance parameters of cast stainless steel CF8M metal parts after aging.

[0095] Example 2: Non-destructive testing and evaluation methods for cast stainless steel CF8M metal parts.

[0096] 2.1 Polish the surface of the metal component to be inspected, install the non-destructive testing (NDT) subsystem on the component, and maintain constant contact between the cold-end probe of the NDT subsystem and the surface of the component. The hot-end probe, after heating, moves vertically and horizontally across the component surface to make contact and measure at different measurement points, such as... Figure 3 As shown;

[0097] 2.2 Obtaining the detection parameters of the nondestructive testing subsystem TEP and initial value of thermoelectric potential TEP int The degree of change in normalized thermoelectric potential ( TEP - TEP int ) / TEP int =10%;

[0098] 2.3 Input the thermoelectric potential value of the non-destructive testing parameter into the non-destructive testing model to obtain the impact energy value of the metal component after aging. The model relationship is as follows:

[0099] ,

[0100] in CV sat / CV int =0.17 ，M CV =0.06, S =0.05.

[0101] 2.4 Obtain the degree of impact energy reduction after aging of service metal components CV 2 / CV int =31%.

[0102] 2.5 Relationship curves between non-destructive testing values, normalized impact energy, and thermoelectric potential (CV / ) CV int – TEP / TEP int like Figure 5 As shown, the impact energy value decreases at a gradually accelerating rate in the initial stage, and then gradually levels off in the later stage, as the thermoelectric potential changes. The non-destructive testing and evaluation method proposed in this invention can be used to obtain the impact performance parameters of cast stainless steel CF8M metal parts after aging.

[0103] Example 3: Destructive testing and evaluation methods were used for cast stainless steel CF8M metal parts.

[0104] 3.1 Mechanical property test specimens were sampled and processed from the surface of the metal parts to be inspected, and machined into standard V-notch impact specimens with a notch angle of 45°, a root radius of 0.25 mm, a ligament width of 8 mm, and a specimen size of 55 mm. 10mm 10mm;

[0105] 3.2 Destructive testing of the above-mentioned impact specimens was carried out in the laboratory using an impact testing system;

[0106] 3.3 Based on the results of destructive testing, the degree of impact energy reduction after aging of service metal components is obtained as follows: CV 3 / CV int =30%.

[0107] Example 4: Evaluation methods for cast stainless steel CF8M metal parts using micro-destructive testing and non-destructive testing.

[0108] 4.1 According to Example 1, a micro-destructive testing and evaluation method was used on cast stainless steel CF8M metal parts to obtain the degree of impact energy reduction after aging of the metal parts in service. CV 1 / CV int =35%;

[0109] 4.2 According to Example 2, non-destructive testing and evaluation methods were used on cast stainless steel CF8M metal parts to obtain the degree of impact energy reduction after aging of the metal parts in service. CV 2 / CV int =31%;

[0110] 4.3 The aging assessment of service metal components adopts a conservative value based on the results of the above-mentioned micro-destructive testing and non-destructive testing methods, i.e., the minimum value CV = MIN ( CV 1, CV 2) The degree of decrease in impact energy after aging of service metal components is CV / CV int =31%.

[0111] Example 5: Evaluation methods for micro-destructive testing, non-destructive testing, and destructive testing of cast stainless steel CF8M metal parts.

[0112] 5.1 According to Example 1, a micro-destructive testing and evaluation method was used on cast stainless steel CF8M metal parts to obtain the degree of impact energy reduction after aging of the metal parts in service. CV 1 / CV int =35%;

[0113] 5.2 According to Example 2, non-destructive testing and evaluation methods were used on cast stainless steel CF8M metal parts to obtain the degree of impact energy reduction after aging of the metal parts in service. CV 2 / CV int =31%;

[0114] 5.3 According to Example 3, destructive testing and evaluation methods were used on cast stainless steel CF8M metal parts to obtain the degree of impact energy reduction after aging of the service metal parts. CV 3 / CV int =30%;

[0115] 5.4 The aging assessment of service metal components adopts a conservative value based on the results of the three methods mentioned above: micro-destructive testing, non-destructive testing, and destructive testing, i.e., the minimum value CV = MIN ( CV 1, CV 2, CV 3) The degree of decrease in impact energy after aging of service metal components is CV / CV int =30%.

[0116] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions for some or all of the technical features, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for multi-dimensional detection and assessment of aging of metal components of a nuclear power plant, characterized in that, It comprises the following steps: S1, selecting the detection method of the aging of the metal parts of the nuclear power plant, the detection method comprising any one of the micro-damage detection and the non-destructive detection or both; S2, calculating the impact energy value of the aged metal parts in service; (1) For micro-damage detection, the aging time of the detected service metal part, the detection parameters and the material parameters are obtained; the detection parameters include the microhardness value; the material parameters include the saturated microhardness value 、 The initial microhardness value, the saturated impact energy, the initial impact energy, the impact energy characteristic parameter and the microhardness characteristic parameter; The calculation method of the impact energy value of the aged metal parts in service is as follows: ， wherein HV is the microhardness value, HV sat is the saturated microhardness value, HV int is the initial microhardness value, t is the aging time, M H is the HV sat and HV int the mean value of the log 10 t value; CV 1 is the impact energy obtained from the microdamage detection, CV sat is the saturated impact energy, CV int is the initial impact energy, CV 0 is the impact energy characteristic parameter, HV 0 is the microhardness characteristic parameter; (2) For non-destructive detection, the aging time, detection parameters and material parameters of the metal parts in service to be detected are obtained; the detection parameters comprise the thermoelectric potential value of the surface of the metal parts; the material parameters comprise the saturated impact energy, the initial impact energy, the initial value of the thermoelectric potential and the material thermoelectric parameters; The calculation method of the impact energy value of the aged metal parts in service is as follows: ， wherein TEP is the thermoelectric potential value, TEP int is the initial thermoelectric potential value, S is the material thermoelectric parameter, M CV is the CV sat and CV int corresponding to the mean value of TEP values; CV 2 is the impact energy obtained by non-destructive testing; CVsat is the saturation impact energy; CVint is the initial impact energy; S3, the impact energy value of the aged service metal part obtained by the micro-damage or non-destructive detection, obtaining the aging evaluation result of the service metal part: when only one of the two detection methods is selected, the aging evaluation of the service metal part takes the result of one detection method; when both detection methods are selected, the aging evaluation of the service metal part takes the conservative value of the results of the two detection methods, that is, the minimum value CV=MIN( CV 1, CV 2) The detection method of the nuclear power plant metal component aging in the step S1 further comprises a destructive detection; in the step S2, for the destructive detection, the surface of the to-be-detected service metal component is sampled and processed in mechanical property, and a test system is used to carry out the destructive detection in a laboratory, and the impact energy value of the service metal component after aging is obtained according to the result of the destructive detection CV 3; when only one of the three detection methods of micro-damage detection, non-destructive detection and destructive detection is selected, the result of one detection method is taken as the aging evaluation result of the service metal component; when two or three of the three detection methods are selected, the conservative value of the results of two or three detection methods, that is, the minimum value CV=MIN (, is taken as the aging evaluation result of the service metal component CV 1, CV 2, CV 3).

2. A method for multi-dimensional detection and assessment of aging of metal components of a nuclear power plant as claimed in claim 1, characterized in that In the step S2, the method for obtaining the micro-damage detection parameters is as follows: The pressure of the indenter probe is applied to the ferrite on the surface of the metal parts and is kept, and the pressure parameters of the indenter probe are recorded; after the indenter probe is unloaded, the size of the indentation of the indenter probe on the ferrite is observed and measured using an optical microscope, and the indentation size parameters are recorded; according to the indentation size parameters, the microhardness value is calculated: ， In the formula, d 1、 d 2 is the diagonal length of the indentation.

3. The method for multi-dimensional detection and assessment of aging of metal components of nuclear power plants as claimed in claim 1, characterized in that In the step S2, the method for obtaining the non-destructive detection parameters is as follows: The cold end probe is kept in contact with the surface of the parts to be detected, and the hot end probe is moved vertically and horizontally on the surface of the parts after being heated, and different measurement points are contacted and measured, and the thermoelectric potential detection parameter value is recorded, wherein the thermoelectric potential detection parameter value TEP = ΔV / ΔT, ΔV is the voltage difference, and ΔT is the temperature difference.

4. A multi-dimensional detection and assessment system of aging of metal components of a nuclear power plant, characterized in that, The multi-dimensional detection and evaluation system comprises a comprehensive evaluation module, a micro-damage detection subsystem, a non-destructive detection subsystem and a destructive detection subsystem; wherein: The comprehensive evaluation module is used for selecting the detection method of the aging of the metal parts of the nuclear power plant, the detection method being any one of the micro-damage detection and the non-destructive detection or both; and the results of the detection methods are comprehensively evaluated to obtain the aging evaluation results of the metal parts in service, wherein when only one of the two detection methods is selected, the aging evaluation results of the metal parts in service are taken as the results of the one detection method; when both of the two detection methods are selected, the aging evaluation results of the metal parts in service are taken as the conservative value of the results of the two detection methods, i.e. the minimum value; The micro-damage detection subsystem is used for realizing micro-damage detection of a metal component of a nuclear power plant, and comprises a data acquisition module and a micro-damage detection model; the data acquisition module is used for acquiring aging time, detection parameters and material parameters of the metal component to be detected, the detection parameters comprising a micro-hardness value, and the material parameters comprising a saturated micro-hardness value 、 An initial micro-hardness value, a saturated impact energy, an initial impact energy, an impact energy characteristic parameter and a micro-hardness characteristic parameter; the micro-damage detection model is used for calculating an impact energy value of the metal component after aging, and the calculation method is as follows: ， wherein HV is the microhardness value, HV sat is the saturated microhardness value, HV int is the initial microhardness value, t is the aging time, M H is the HV sat and HV int the mean value of the log 10 t value; CV 1 is the impact energy obtained from the microdamage detection, CV sat is the saturated impact energy, CV int is the initial impact energy; CV 0 is the impact energy characteristic parameter, HV 0 is the microhardness characteristic parameter; The non-destructive detection subsystem is used for realizing the non-destructive detection of the metal parts of the nuclear power plant; comprising a data acquisition module and a non-destructive detection model; the data acquisition module is used for obtaining the aging time, detection parameters and material parameters of the metal parts in service to be detected, the detection parameters comprising the thermoelectric potential value of the surface of the metal parts, and the material parameters comprising the saturated impact energy, the initial impact energy, the initial value of the thermoelectric potential and the material thermoelectric parameters; the non-destructive detection model is used for calculating the impact energy value of the aged metal parts in service, and the calculation method is as follows: ， wherein CV 2 is the impact energy obtained by non-destructive testing, CV int is the initial impact energy, TEP is the thermoelectric potential value, TEP int is the initial thermoelectric potential value, S is the material thermoelectric parameter, M CV is CV sat and CV int the mean value of TEP values; The lossy detection subsystem is used to record the part material impact energy values obtained after the in-service metal part is subjected to lossy detection CV 3; The detection mode provided by the comprehensive evaluation module includes one or more of micro-damage detection, non-destructive detection, and destructive detection; when only one of the three detection modes is selected, the service metal part aging assessment takes the result of the one detection mode; when two or three of the three detection modes are selected, the service metal part aging assessment takes the conservative value, i.e., the minimum value CV=MIN( CV 1, CV 2, CV 3).

5. A multi-dimensional detection and assessment system of aging of metal components of a nuclear power plant as claimed in claim 4, wherein, The data acquisition module of the micro-damage detection subsystem further comprises an indentation probe for pressing and holding the ferrite on the surface of the service metal part to be detected; an optical microscope for observing and measuring the indentation size of the indentation probe on the ferrite to obtain a micro-hardness value; and the micro-damage detection model is installed on a measurement workstation, and the data acquisition module transmits the collected data to the micro-damage detection model.

6. A multi-dimensional detection and assessment system of aging of metal components of a nuclear power plant as claimed in claim 4 wherein, The data acquisition module of the non-destructive detection subsystem further comprises a hot probe and a cold probe for measuring the thermoelectric potential value of the surface of the service metal part to be detected; in use, the cold end probe is always in contact with the surface of the part to be detected, the hot end probe is heated and then moves vertically and horizontally on the surface of the part to contact and measure different measurement points; and the non-destructive detection model is installed on a measurement workstation, and the data acquisition module transmits the collected thermoelectric potential value to the non-destructive detection model.

Images