Multi-dimensional detection and evaluation method and system for aging of metal parts of nuclear power plant

Abstract

The invention discloses a multi-dimensional detection and evaluation method and system for aging of a metal part of a nuclear power plant, and the method comprises the steps: selecting a to-be-detected and evaluated metal part of the nuclear power plant, and carrying out the multi-dimensional aging detection and evaluation of the part through one or more of a lossy mode, a micro-lossy mode and a lossless mode according to an on-site environment and a detection limiting condition, and obtaining an aging evaluation result of the service metal part. The method realizes multi-dimensional detection and evaluation of aging of the metal parts of the nuclear power plant, masters the performance change and damage condition of the metal parts in the service process, and provides technical support for aging management, life evaluation and life extension of the nuclear power plant.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detection and evaluation of aging of metal components of nuclear power plants, and particularly relates to a multi-dimensional detection and evaluation method and system for aging of metal components of nuclear power plants. BACKGROUND

[0002] With the increasing number of aging nuclear power plants in China and the demonstration application of new generation nuclear power technology, it is urgent to comprehensively and effectively evaluate the material aging and performance degradation state of key structures of nuclear power caused by severe environments such as irradiation, high temperature and corrosion, in order to meet the needs of high-specification safety supervision and license renewal of nuclear power. At present, non-destructive testing and evaluation are mainly carried out on macroscopic defects during routine maintenance, and there is still a lack of effective detection and evaluation of aging state.

[0003] Currently, the mechanical properties of metal components are obtained by destructive sampling of the excess material or witness material before the metal components leave the factory, and the standard samples are made to obtain the test results in the laboratory by various mechanical tests. This method can only obtain the performance parameters before the service of the metal components, and cannot master the performance changes after the service of the components. At the same time, the commonly used non-destructive testing methods (such as ultrasonic, X-ray and penetration testing) in nuclear power field are to detect dangerous parts in the components or to detect defects and sizes, but cannot evaluate the mechanical properties of the component materials. SUMMARY

[0004] One of the purposes of the present application is to provide a multi-dimensional detection and evaluation method for aging of metal components of nuclear power plants, which realizes multi-dimensional detection and evaluation of aging of metal components of nuclear power plants, masters the performance changes and damage conditions in the service process, and provides technical support for aging management, life evaluation and life extension of nuclear power plants.

[0005] The technical scheme of the present application is as follows: A multi-dimensional detection and evaluation method for aging of metal components of nuclear power plants, comprising the following steps: S1, selecting a metal component aging detection method of a nuclear power plant, wherein the detection method includes any one of micro-damage detection and non-destructive detection or both; S2, calculating the impact energy value of the serviced metal component after aging; (1) For micro-damage detection, the aging time, detection parameters and material parameters of the serviced metal component to be detected are obtained; the detection parameters include microhardness value; the material parameters include saturated microhardness value 、 initial microhardness value, saturated impact energy, initial impact energy, impact energy characteristic parameter and microhardness characteristic parameter; The impact energy value of the serviced metal component after aging is calculated, 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 average of the log 10 t values; CV 1 is the impact energy obtained by 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 testing, the aging time of the metal part to be tested, the detection parameters and the material parameters are obtained; the detection parameters include the thermoelectric potential value of the surface of the metal part; the material parameters include the saturated impact energy, the initial impact energy, the initial thermoelectric potential value and the material thermoelectric parameter; The impact energy value of the metal part in service after aging is calculated, and the calculation method 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 the average of the log TEP values; CV 2 is the impact energy obtained by non-destructive testing; CVsat is the saturated impact energy; CVint is the initial impact energy; S3, according to the impact energy value of the metal part in service after aging obtained by microdamage or non-destructive testing, the aging evaluation result of the metal part in service is obtained: when only one of the above two detection methods is selected, the aging evaluation of the metal part in service takes the result of one detection method; when both detection methods are selected, the aging evaluation of the metal part in service takes the conservative value of the result of two detection methods, that is, the minimum value CV=MIN ( CV 1, CV2)。

[0006] Preferably, the nuclear power plant metal component aging detection method 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 the destructive detection is carried out in a laboratory by using a test system, 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 micro-damage detection, the non-destructive detection and the destructive detection is selected, the result of the service metal component aging evaluation is obtained by taking one of the detection methods; when two or three of the above-mentioned detection methods are selected, the result of the service metal component aging evaluation is obtained by taking the conservative value, i.e. the minimum value CV=MIN (TEP, H, HV) of the results of the two or three detection methods CV 1, CV 2, CV 3)。

[0007] Preferably, in the step S2, the method for obtaining the micro-damage detection parameter is as follows: The pressure of the metal component surface ferrite is applied by using an indentation probe and is preserved, and the pressure parameter of the indentation probe is recorded; after the unloading of the indentation probe, the indentation size of the indentation probe on the ferrite is observed and measured by using an optical microscope, and the indentation size parameter is recorded; and the microhardness value is calculated according to the indentation size parameter: , In the formula, d 1、 d 2 is the diagonal length of the indentation.

[0008] Preferably, in the step S2, the method for obtaining the non-destructive detection parameter is as follows: The cold end probe is kept in contact with the surface of the to-be-detected component, the hot end probe is heated and moves vertically and horizontally on the surface of the component after heating, the 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.

[0009] The second object of the present application is to provide a multi-dimensional detection and evaluation system for nuclear power plant metal component aging.

[0010] A multi-dimensional detection and evaluation system for nuclear power plant metal component aging, the multi-dimensional detection and evaluation system comprises a comprehensive evaluation module, a micro-damage detection subsystem and a non-destructive detection subsystem; wherein: The comprehensive evaluation module is used for selecting a detection method of aging of a metal component of a nuclear power plant, the detection method being any one of micro-damage detection, non-destructive detection or both detection methods; and performing comprehensive evaluation on a result of the detection method to obtain an aging evaluation result of the service metal component, wherein when only one of the two detection methods is selected, the aging evaluation of the service metal component takes a result of the one detection method; and when both detection methods are selected, the aging evaluation of the service metal component takes a conservative value, i.e., a minimum value, of the results of the two detection methods. The micro-damage detection subsystem is used for realizing micro-damage detection of the metal component of the nuclear power plant, and includes 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 service metal component to be detected, the detection parameters including a micro-hardness value, and the material parameters including 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 service metal component after aging, and the calculation method is as follows: , wherein, HV is the micro-hardness value, HV sat is the saturated micro-hardness value, HV int is the initial micro-hardness value, t is the aging time, M H is HV sat and HV int corresponding to a log 10 t value of the mean value of CV 1 is the impact energy obtained by the micro-damage 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 micro-hardness characteristic parameter; The non-destructive testing subsystem is used for non-destructive testing of the metal components of the nuclear power plant, and comprises a data acquisition module and a non-destructive testing model; the data acquisition module is used for acquiring the aging time, detection parameters and material parameters of the metal component to be detected; the detection parameters comprise a thermoelectric potential value of the surface of the metal component; the material parameters comprise a saturation impact energy, an initial impact energy, a thermoelectric potential initial value and a material thermoelectric parameter; the non-destructive testing model is used for calculating the impact energy value of the metal component after aging, 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 thermoelectric potential initial value, S is the material thermoelectric parameter, M CV is CV sat and CV int the mean value of TEP .

[0011] Preferably, the multi-dimensional detection and evaluation system further comprises a destructive testing subsystem; The destructive testing subsystem is used for recording the component material impact energy value obtained by destructive testing of the metal component in service, CV 3. The detection mode provided by the comprehensive evaluation module comprises one or more of micro-damage detection, non-destructive testing and destructive testing; when only one of the above three detection modes is selected, the aging evaluation of the metal component in service is taken as the result of the method; when two or three of the above three detection modes are selected, the aging evaluation of the metal component in service is taken as the conservative value, i.e. the minimum value CV = MIN ( CV 1, CV 2, CV 3).

[0012] Preferably, the data acquisition module of the micro-damage detection subsystem further comprises an indentation probe and an optical microscope; the indentation probe is used for pressing and holding the ferrite on the surface of the metal component to be detected; the optical microscope is used for observing and measuring the indentation size of the indentation probe on the ferrite to obtain a microhardness value; 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.

[0013] Preferably, the data acquisition module of the non-destructive testing subsystem further comprises a hot probe and a cold probe, the hot probe and the cold probe being used to measure the thermoelectric potential value of the surface of the service metal component to be detected, in use, the cold end probe is kept in contact with the surface of the component to be detected, and the hot end probe is heated and then vertically and horizontally moved on the surface of the component to contact and measure different measuring points; the non-destructive testing model is installed on the measuring work station, and the thermoelectric potential value collected by the data acquisition module is transmitted to the non-destructive testing model.

[0014] Compared with the prior art, the present application has the following advantages: (1) The present application adopts a multi-dimensional detection and evaluation method and system of loss, micro-loss and non-destructive methods, and realizes the detection and evaluation of metal components in different dimensions according to the model relationship of corresponding detection parameters.

[0015] (2) The multi-dimensional detection and evaluation method and system adopted by the present application are all for field service metal components, and realize accurate detection of the mechanical performance index of the service equipment, which is crucial for correctly evaluating the safety of the service equipment. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A flow chart of a multi-dimensional detection and evaluation method of nuclear power plant metal component aging is provided in the present application. Figure 2 A schematic diagram of a micro-loss detection subsystem is provided in the present application. Figure 3 A schematic diagram of a non-destructive testing subsystem is provided in the present application. Figure 4 A CV / CV int - HV / HV int Figure Figure 5 A CV / CV int - TEP / TEP int Figure

[0017] In the figure, 1. Metal pipeline component; 2. Measuring work station; 3. Micro-loss detection subsystem; 4. Micro-loss detection indentation probe; 5. Non-destructive testing subsystem; 6. Hot end probe of non-destructive testing subsystem; 7. Cold end probe of non-destructive testing subsystem. DETAILED DESCRIPTION

[0018] The technical solutions provided by the present application are further described below in combination with the drawings.

[0019] 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.

[0020] 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: 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.

[0021] S2. Conduct testing and evaluation based on the selected testing and evaluation methods; (1) For destructive testing, the testing evaluation method is as follows: Mechanical property samples are taken and processed from the surface of the metal components to be inspected. Destructive testing is then conducted in the laboratory using a testing system. The impact energy value of the metal components after aging is obtained based on the results of the destructive testing. CV 3.

[0022] 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).

[0023] (2) For micro-destructive testing, the testing and evaluation methods are as follows: 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; 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: , 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.

[0024] The method for calculating the impact energy of service-grade metal components after aging is as follows: , in, HV This is the microhardness value. HV sat This is 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; (3) For non-destructive testing, the testing evaluation method is as follows: 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. 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).

[0025] The above material parameters were obtained by conducting accelerated aging tests on the sample materials in the laboratory.

[0026] The impact energy value of service-grade metal components after aging is calculated using the following method: , 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.

[0027] (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).

[0028] 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: 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); 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; 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: , in, HV This is the microhardness value. HV sat This is 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; 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 and thermoelectric potential value of the metal component surface; the non-destructive testing model is used to calculate the impact energy value of the aged metal component, and the calculation method is as follows: 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.

[0029] 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.

[0030] 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.

[0031] Example 1: Micro-destructive testing and evaluation methods for cast stainless steel CF8M metal parts.

[0032] 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; 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%; 1.3 Input the microhardness value, a parameter for micro-destructive testing, into the micro-destructive testing model. The model relationship is as follows: , in CV sat / CV int =0.22, CV 0 =251.17, HV 0 =0.17.

[0033] 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%.

[0034] 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.

[0035] Example 2: Non-destructive testing and evaluation methods for cast stainless steel CF8M metal parts.

[0036] 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; 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%; 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: , in CV sat / CV int =0.17 ，M CV =0.06, S =0.05.

[0037] 2.4 Obtain the degree of impact energy reduction after aging of service metal components CV 2 / CV int =31%.

[0038] 2.5 Relationship curves between non-destructive testing values, normalized impact energy, and thermoelectric potential (CV / ) CV int – TEP / TEP int like Figure 5As 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.

[0039] Example 3: Destructive testing and evaluation methods were used for cast stainless steel CF8M metal parts.

[0040] 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; 3.2 Destructive testing of the above-mentioned impact specimens was carried out in the laboratory using an impact testing system; 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%.

[0041] Example 4: Evaluation methods for cast stainless steel CF8M metal parts using micro-destructive testing and non-destructive testing.

[0042] 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%; 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%; 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%.

[0043] Example 5: Evaluation methods for micro-destructive testing, non-destructive testing, and destructive testing of cast stainless steel CF8M metal parts.

[0044] 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%; 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%; 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%; 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%.

[0045] 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 include the thermoelectric potential value of the surface of the metal parts; the material parameters include 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-damage 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).

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 The detection method of the nuclear power plant metal component aging in the step S1 further includes 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).

3. A method for multi-dimensional detection and assessment of aging of metal components of a nuclear power plant according to claim 1 or 2, 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.

4. The method for multi-dimensional detection and assessment of aging of metal components of nuclear power plants as claimed in claim 1 or 2, 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.

5. 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 and a non-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, i.e. the minimum value, of the results of the two detection methods; 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 including the thermoelectric potential value of the surface of the metal parts, and the material parameters including 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 from 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.

6. A multi-dimensional detection and assessment system of aging of metal components of a nuclear power plant as claimed in claim 5, wherein, It also comprises a destructive detection subsystem; 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).

7. A multi-dimensional detection and assessment system of aging of metal components of a nuclear power plant as claimed in claim 5 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.

8. A multi-dimensional detection and assessment system of aging of metal components of a nuclear power plant as claimed in claim 5 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.

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