Method for positioning minimum energy absorption position of Charpy impact sample and related equipment

Abstract

The invention discloses a method for positioning the minimum energy absorption position of a Charpy impact sample and related equipment, and belongs to the field of weld Charpy impact tests.The method comprises the steps that firstly, Vickers hardness test data of the Charpy impact sample are obtained; fitting Vickers hardness test data to obtain a hardness point matrix, and drawing a hardness distribution color graph according to the hardness point matrix; and finally, the minimum energy absorption position of the Charpy impact sample is obtained through positioning by analyzing the hardness distribution color graph. According to the method, through fitting of Vickers hardness test data and drawing of a hardness distribution color graph, the position of the center line of the Charpy impact sample can be accurately determined, namely, the position of the minimum absorbed energy of the Charpy impact sample is positioned; according to the method, the distance between the center line of the Charpy impact sample of the pipeline steel pipe with the same specification and the same process and the fusion line can be accurately positioned, an important reference basis is provided for determining the position of the center line of the Charpy impact sample in the subsequent inspection process, and the data accuracy and the working efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of weld Charpy impact test, and particularly relates to a method for positioning the minimum absorbed energy position of a Charpy impact test sample and related equipment. BACKGROUND

[0002] Charpy impact test is a commonly used material mechanics test method, which can objectively evaluate the performance of the material and provide important basic data for the design and manufacture of materials and parts. The Charpy impact absorbed energy of the heat-affected zone (HAZ) of a welded steel pipe is an important indicator for material design and application. In commonly used pipeline pipe standards such as API 5L "Pipeline Steel Pipe Specification" and GB / T 9711 "Steel Pipe for Pipeline Transportation System in Petroleum and Natural Gas Industry", there are clear provisions for sampling of Charpy impact test samples. The standard stipulates that in order to ensure that the impact test notch of the heat-affected zone (HAZ) of the steel pipe is opened at the appropriate position, the test sample should be corroded before the notch is opened. When the heat-affected zone (HAZ) sample is prepared, the axis of the notch should be as close as possible to the outer weld bead fusion line as shown in Figure 1 ; the sampling should be as close as possible to the outer diameter surface of the steel pipe. Due to the different pipe body groove opening angles before welding of the steel pipe, or due to the different heat inputs during the welding process of the weld, the position of the heat-affected zone does not necessarily coincide with the center line of the weld obtained by the above sampling method, so the Charpy impact absorbed energy obtained is not necessarily the absorbed energy of the weakest position of the material.

[0003] Therefore, in the process of determining the Charpy impact absorbed energy of the heat-affected zone of the welded joint of the welded steel pipe, according to the existing standard provisions, the Charpy impact absorbed energy of the test sample obtained is not necessarily the minimum absorbed energy of the heat-affected zone, and although the measurement result is accurate, it cannot reflect the Charpy impact absorbed energy of the weakest part of the welded joint. SUMMARY

[0004] In order to overcome the shortcomings of the above-mentioned technology, the present application provides a method for positioning the minimum absorbed energy position of a Charpy impact test sample and related equipment, which can solve the technical problem that the existing determination method cannot accurately position the minimum absorbed energy position of a Charpy impact test sample, resulting in the inability to reflect the Charpy impact absorbed energy of the weakest part of the welded joint.

[0005] In order to achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0006] A method for positioning the minimum absorbed energy position of a Charpy impact test sample, comprising:

[0007] S1: obtaining Vickers hardness test data of a pretreated Charpy impact test sample;

[0008] S2: fitting the Vickers hardness test data to obtain a hardness point matrix;

[0009] S3: draw the hardness point matrix into a hardness distribution color map;

[0010] S4: based on the hardness distribution color map, output the minimum absorbed energy position of the charpy impact specimen.

[0011] Further, in S1, the pretreatment process of the charpy impact specimen includes:

[0012] The measured surface of the notch of the charpy impact specimen is sequentially polished and polished;

[0013] The polished measured surface is etched.

[0014] Further, wherein the measured surface is sequentially polished by five different types of sandpaper of 240#-1500#; the polished measured surface is etched by 2% nitric acid and 98% alcohol solution.

[0015] Further, in S1, the Vickers hardness test is performed on the charpy impact specimen to obtain Vickers hardness test data, wherein the hardness value of the Vickers hardness test is HV0.5, HV1 or HV2.

[0016] Further, in the Vickers hardness test process, the distance from the indentation of the charpy impact specimen to the edge of the charpy impact specimen is at least 3 times the diagonal length of the indentation of the charpy impact specimen; the distance between the centers of two adjacent indentations of the charpy impact specimen is at least 3 times the diagonal length of the indentation of the charpy impact specimen.

[0017] Further, in S2, the Vickers hardness test data is fitted by linear interpolation, quadratic interpolation or Cubic interpolation.

[0018] Further, the hardness point matrix is drawn into a hardness distribution color map using original or matlab.

[0019] A positioning system for the minimum absorbed energy position of a charpy impact specimen is used to implement the steps of the positioning method for the minimum absorbed energy position of the charpy impact specimen, comprising:

[0020] A data acquisition module for obtaining Vickers hardness test data of a pretreated charpy impact specimen;

[0021] A data fitting module for fitting the Vickers hardness test data to obtain a hardness point matrix;

[0022] A color map drawing module for drawing the hardness point matrix into a hardness distribution color map;

[0023] A position output module for outputting the minimum absorbed energy position of the charpy impact specimen based on the hardness distribution color map.

[0024] An apparatus comprising:

[0025] a memory for storing a computer program;

[0026] a processor for implementing the steps of the method for locating the position of the minimum absorbed energy of a Charpy impact specimen when executing the computer program.

[0027] A computer readable storage medium storing a computer program for implementing the steps of the method for locating the position of the minimum absorbed energy of a Charpy impact specimen when executed by a processor.

[0028] Compared with the prior art, the present application has the following beneficial effects:

[0029] The present application also provides a method for locating the position of the minimum absorbed energy of a Charpy impact specimen, which first obtains Vickers hardness test data of the Charpy impact specimen; then fits the Vickers hardness test data to obtain a hardness point matrix, and draws a hardness distribution color map according to the hardness point matrix; and finally locates the position of the minimum absorbed energy of the Charpy impact specimen by analyzing the hardness distribution color map. The method can accurately determine the center line position of the Charpy impact specimen by fitting the Vickers hardness test data and drawing the hardness distribution color map, i.e., complete the location of the position of the minimum absorbed energy of the Charpy impact specimen. The method can accurately locate the distance between the center line of the Charpy impact specimen of the same specification and process pipeline steel pipe and the fusion line, providing an important reference for determining the position of the center line of the Charpy impact specimen in the subsequent inspection process, and improving the accuracy of data and work efficiency. The method has a simple principle, is easy to implement, and has good popularization and application value.

[0030] Preferably, in the present application, the Charpy impact specimen is pretreated in advance, including sequentially polishing and polishing the surface to be measured of the notch of the Charpy impact specimen, and corrosion treatment, meeting the test environment conditions of the Charpy impact test, and ensuring the accuracy of the final positioning position.

[0031] Further preferably, in the present application, five different types of sandpaper of 240#-1500# are used to sequentially polish the surface to be measured; at the same time, a 2% nitric acid and 98% alcohol solution is used to corrode the polished surface to be measured; in this way, the accuracy of the Vickers hardness test data is further ensured.

[0032] Preferably, in the present application, during the Vickers hardness test, the distance from the indentation to the edge of the Charpy impact specimen is at least 3 times the diagonal length of the Charpy impact specimen indentation; the distance between the centers of two adjacent Charpy impact specimen indentations is at least 3 times the diagonal length of the Charpy impact specimen indentation; first, maintaining a sufficient distance from the edge of the indentation to the edge of the specimen can avoid the influence of edge effect on the hardness test. Edge effect can cause uneven stress and strain distribution in the test area, thereby affecting the measurement of hardness. By ensuring that the indentation is far away from the edge of the specimen, the influence can be reduced, and the test result is more accurate. Second, maintaining a sufficient distance between the centers of two adjacent indentations can avoid the interaction between the indentations. If the indentations are too close, the stress field between them may interfere with each other, resulting in inaccurate hardness values. Therefore, by ensuring that the distance between the indentations is large enough, the interaction can be eliminated, and each indentation is independent and accurate. By the above operation, the accuracy and reliability of the Vickers hardness test can be ensured, so that more accurate material hardness data can be obtained. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A schematic diagram of the heat-affected zone of the Charpy impact specimen position provided by the embodiment of the present application;

[0034] Figure 2 A flowchart of a positioning method for the minimum absorbed energy position of a Charpy impact specimen provided by the embodiment of the present application;

[0035] Figure 3 A schematic diagram of a dense-point Vickers hardness provided by the embodiment of the present application;

[0036] Figure 4 A schematic diagram of a hardness distribution color map provided by the embodiment of the present application;

[0037] Figure 5 A schematic diagram of the notch centerline position of a Charpy impact specimen provided by the embodiment of the present application;

[0038] Figure 6 A flowchart of a positioning method for the minimum absorbed energy position of a Charpy impact specimen provided by the present application;

[0039] Figure 7 A structural schematic diagram of a positioning system for the minimum absorbed energy position of a Charpy impact specimen provided by the present application.

[0040] Reference signs:

[0041] Charpy impact specimen notch-1; Charpy impact specimen notch centerline-2. DETAILED DESCRIPTION

[0042] The present application provides a positioning method for the minimum absorbed energy position of a Charpy impact specimen, asFigure 6 As shown, comprising the following steps:

[0043] S1: obtaining the Vickers hardness test data of the pretreated Charpy impact sample.

[0044] The pretreatment process of the Charpy impact sample comprises:

[0045] The measured surface of the notch of the Charpy impact sample is sequentially polished and polished;

[0046] The polished measured surface is subjected to etching treatment.

[0047] Specifically, the measured surface is sequentially polished by using five different types of sandpaper of 240#-1500#; the polished measured surface is subjected to etching treatment by using a 2% nitric acid and 98% alcohol solution.

[0048] In addition, the Vickers hardness test of the Charpy impact sample is performed to obtain the Vickers hardness test data, wherein the hardness value of the Vickers hardness test is HV0.5, HV1 or HV2.

[0049] During the Vickers hardness test, the distance from the indentation of the Charpy impact sample to the edge of the Charpy impact sample is at least 3 times the diagonal length of the indentation of the Charpy impact sample; the distance between the centers of two adjacent indentation of the Charpy impact sample is at least 3 times the diagonal length of the indentation of the Charpy impact sample.

[0050] After this step, the Vickers hardness data of the close-packed points are obtained,

[0051] S2: fitting the Vickers hardness data of the close-packed points to obtain a hardness point matrix. Here, the Vickers hardness test data is fitted by using linear interpolation, quadratic interpolation or Cubic interpolation to obtain a high-density hardness point matrix.

[0052] S3: drawing the hardness point matrix into a hardness distribution color map; in this step, the hardness point matrix is drawn into a hardness distribution color map by using original or matlab.

[0053] S4: based on the hardness distribution color map, outputting the minimum absorbed energy position of the Charpy impact sample.

[0054] As Figure 7 shown, the present application also provides a positioning system for the minimum absorbed energy position of a Charpy impact sample, comprising: a data acquisition module for obtaining the Vickers hardness test data of a pretreated Charpy impact sample; a data fitting module for fitting the Vickers hardness test data to obtain a hardness point matrix; a color map drawing module for drawing the hardness point matrix into a hardness distribution color map; a position output module for outputting the minimum absorbed energy position of the Charpy impact sample based on the hardness distribution color map.

[0055] The application also provides a device comprising a memory for storing a computer program and a processor for implementing the steps of the method for positioning the minimum absorbed energy position of a Charpy impact specimen when executing the computer program.

[0056] The processor implements the steps of the method for positioning the minimum absorbed energy position of a Charpy impact specimen when executing the computer program, for example: obtaining Vickers hardness test data of a pretreated Charpy impact specimen; performing fitting processing on the Vickers hardness test data to obtain a hardness point matrix; drawing the hardness point matrix into a hardness distribution color map; and outputting the minimum absorbed energy position of the Charpy impact specimen based on the hardness distribution color map.

[0057] Alternatively, the processor implements the functions of the modules in the system when executing the computer program, for example: a data acquisition module for obtaining Vickers hardness test data of a pretreated Charpy impact specimen; a data fitting module for performing fitting processing on the Vickers hardness test data to obtain a hardness point matrix; a color map drawing module for drawing the hardness point matrix into a hardness distribution color map; and a position output module for outputting the minimum absorbed energy position of the Charpy impact specimen based on the hardness distribution color map.

[0058] Exemplarily, the computer program can be divided into one or more modules / units, which are stored in the memory and executed by the processor to complete the application. The one or more modules / units can be a series of computer program instruction segments capable of completing a preset function, which are used to describe the execution process of the computer program in the device for positioning the minimum absorbed energy position of a Charpy impact specimen. For example, the computer program can be divided into a data acquisition module, a data fitting module, a color map drawing module, and a position output module; the specific functions of the modules are as follows: the data acquisition module is used to obtain Vickers hardness test data of a pretreated Charpy impact specimen; the data fitting module is used to perform fitting processing on the Vickers hardness test data to obtain a hardness point matrix; the color map drawing module is used to draw the hardness point matrix into a hardness distribution color map; and the position output module is used to output the minimum absorbed energy position of the Charpy impact specimen based on the hardness distribution color map.

[0059] The Charpy impact specimen minimum absorption energy position positioning device can be a desktop computer, a notebook, a palm computer, a cloud server, and the like. The Charpy impact specimen minimum absorption energy position positioning device can include, but is not limited to, a processor and a memory. Those skilled in the art can understand that the above is an example of the Charpy impact specimen minimum absorption energy position positioning device, and does not constitute a limitation on the Charpy impact specimen minimum absorption energy position positioning device. The Charpy impact specimen minimum absorption energy position positioning device can include more components, or combine certain components, or different components, for example, the Charpy impact specimen minimum absorption energy position positioning device can also include an input / output device, a network access device, a bus, and the like.

[0060] The processor can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor and the like. The processor is the control center of the Charpy impact specimen minimum absorption energy position positioning device, and is connected to various parts of the Charpy impact specimen minimum absorption energy position positioning device through various interfaces and lines.

[0061] The memory can be used to store the computer program and / or modules, and the processor realizes various functions of the Charpy impact specimen minimum absorption energy position positioning device by running or executing the computer program and / or modules stored in the memory, and calling the data stored in the memory.

[0062] The memory can mainly include a program storage area and a data storage area. The program storage area can store an operating system, at least one application required by a function (such as a sound playing function, an image playing function, and the like), and the like. The data storage area can store data created according to the use of the mobile phone (such as audio data, a phonebook, and the like), and the like. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, for example, a hard disk, a memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other volatile solid-state memory devices.

[0063] The present invention also provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the steps of the method for locating the position of minimum absorbed energy of a Charpy impact specimen are implemented.

[0064] If the module / unit integrated in the system for locating the minimum absorbed energy position of the Charpy impact specimen is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.

[0065] Based on this understanding, the present invention can implement all or part of the process of the above-mentioned method for locating the position of minimum absorbed energy of a Charpy impact specimen by instructing related hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When executed by a processor, the computer program can implement the steps of the above-mentioned method for locating the position of minimum absorbed energy of a Charpy impact specimen. The computer program includes computer program code, which can be in source code form, object code form, executable file, or a pre-defined intermediate form.

[0066] The computer-readable storage medium may include: any entity or device that can carry the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0067] It should be noted that the content contained in the computer-readable storage medium can be appropriately increased or decreased according to the requirements of legislation and patent practices in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practices, computer-readable storage media do not include electrical carrier signals and telecommunication signals.

[0068] The present invention will be further described below in conjunction with the embodiments and drawings:

[0069] Example

[0070] As mentioned in the background art, due to the different opening angles of the pipe groove before welding, or due to the different heat input during the welding process, the position of the heat-affected zone does not necessarily coincide with the weld centerline obtained by the above sampling method. The Charpy impact absorption energy obtained in this way is not necessarily the absorption energy of the weakest position of the material. Figure 1As shown in FIG. 1 , the center line 2 of the Charpy impact specimen notch 1 is close to the fusion line. It can be seen that according to existing standards, the Charpy impact specimen absorbed energy obtained is not necessarily the minimum absorbed energy of the heat-affected zone. Although the measurement result is accurate, it cannot reflect the Charpy impact absorbed energy of the weakest part of the weld joint.

[0071] In order to solve the above problems, this embodiment provides a method for locating the position of the minimum absorbed energy of the Charpy impact specimen. By using this method, the weakest part of the Charpy impact specimen of the welded joint can be determined, ensuring that the most conservative result of the Charpy impact absorbed energy of the specimen is obtained.

[0072] like Figure 2 As shown, this embodiment provides a method for locating the minimum absorbed energy position of a Charpy impact specimen, comprising the following steps:

[0073] Step 1: Obtain the impact test strip.

[0074] Step 2: Conduct a close-packed Vickers hardness test on the specified area of ​​the test strip.

[0075] Step 3: Draw a regional hardness distribution color map based on the hardness test results, and use color changes to represent changes in hardness.

[0076] Step 4: Determine the centerline position of the Charpy impact specimen based on the hardness distribution diagram within the heat-affected zone of the test strip.

[0077] Step 5: Determine the Charpy impact sampling method for pipeline steel pipes of the same specification and process, so that the position of the center line of the Charpy impact specimen can be determined based on this result during the subsequent inspection process.

[0078] This embodiment will be further described in detail with reference to the accompanying drawings:

[0079] This embodiment provides a method for locating the position of minimum absorbed energy of a Charpy impact specimen, and the specific steps are as follows:

[0080] Step 1: Cut Charpy impact test bars from the weld area of ​​the pipeline steel pipe by machining or other methods that do not affect the material properties.

[0081] Step 2: Process the surface of the notch of the Charpy impact specimen (surface to be tested) by using five different types of sandpaper from 240# to 1500# to grind the surface to be tested in sequence. After grinding, polish the test sample to ensure the measurement accuracy of the diagonal length of the Vickers hardness indentation in the subsequent steps.

[0082] In this step, the Charpy impact specimen is pretreated in advance, including sequentially polishing and polishing the surface to be tested of the notch of the Charpy impact specimen, and corrosion treatment, meeting the test environment conditions of the Charpy impact test, and ensuring the accuracy of the final positioning position.

[0083] Third step: The surface to be tested is corroded with a 2% nitric acid + 98% alcohol solution to reveal the basic morphology of the different characteristic regions of the weld. After corrosion, 99% alcohol is used for cleaning.

[0084] In this step, five different types of sandpaper, 240#-1500#, are used to polish the surface to be tested in sequence; at the same time, 2% nitric acid and 98% alcohol solution are used to corrode the polished surface to be tested; in this way, the accuracy of the Vickers hardness test data is further ensured.

[0085] Fourth step: As shown in Figure 3 , the Vickers hardness (HV0.5, HV1 or HV2) of the surface to be tested is tested with close-packed points, the distance from the edge indentation to the edge of the specimen is at least 3 times the length of the indentation diagonal, and the distance between the centers of two adjacent indentations is at least 3 times the length of the indentation diagonal. The test point position; after this step, the Vickers hardness test data is obtained.

[0086] In this step, first, maintaining a sufficient distance between the indentation and the edge of the specimen can avoid the influence of edge effect on hardness testing. Edge effect may cause uneven stress and strain distribution in the test area, which in turn affects the measurement results of hardness. By ensuring that the indentation is far away from the edge of the specimen, the influence can be reduced, making the test results more accurate. Second, maintaining a sufficient distance between the centers of two adjacent indentations can avoid the interaction between the indentations. If the indentations are too close, the stress fields between them may interfere with each other, resulting in inaccurate hardness values. Therefore, by ensuring that the distance between the indentations is large enough, the interaction can be eliminated, ensuring that each indentation is independent and accurate. Through the above operation, the accuracy and reliability of the Vickers hardness test can be ensured, so that more accurate material hardness data can be obtained.

[0087] Fifth step: The Vickers hardness test data obtained in the previous step is fitted (the fitting method can use linear interpolation, quadratic interpolation, Cubic interpolation, etc.) to obtain a high-density hardness point matrix. The number of interpolations is determined considering the computer running efficiency and the hardness dot spacing.

[0088] Sixth step: As shown in Figure 4 , the obtained high-density hardness point matrix is processed, and professional software (such as original, matlab, etc.) is used to draw a hardness distribution color map, and a scale corresponding to the map is attached. The number of color steps in the hardness distribution color map should as far as possible reflect the position with hardness difference as best.

[0089] Step seven: as shown in the figure, in the heat affected zone of the test strip, the position of the Charpy impact sample center line is determined according to the hardness distribution color map, so that the center line passes through the area with larger hardness in the heat affected zone as much as possible, and the line is the position of the Charpy impact sample center line determined after the above steps; the position of the Charpy impact sample center line is also the position of the minimum absorbed energy of the Charpy impact sample. Figure 5 The middle black line is the determined position of the Charpy impact sample center line. Figure 5

[0090] Step eight: the distance between the center line determined in the above step and the fusion line is measured, which is the distance between the center line of the Charpy impact sample of the same specification and process pipeline steel pipe and the fusion line, and the position of the center line of the Charpy impact sample can be determined according to the result in the subsequent inspection process.

[0091] In summary, the present application provides a positioning method for the minimum absorbed energy position of a Charpy impact sample, and the key point is that:

[0092] 1. A high-density hardness point matrix is obtained by data fitting according to the results of the closely spaced point Vickers hardness.

[0093] 2. A hardness distribution color map is drawn according to the high-density hardness point matrix.

[0094] 2. The position of the Charpy impact sample notch center line is determined according to the hardness distribution color map.

[0095] The present application provides a positioning method for the minimum absorbed energy position of a Charpy impact sample, and compared with the existing determination method, the present method has the following advantages:

[0096] The positioning method for the minimum absorbed energy position of a Charpy impact sample provided by the present application can accurately determine the position of the Charpy impact sample notch center line in the heat affected zone of the welded steel pipe, and obtain the most conservative Charpy impact absorbed energy representing the welding process.

[0097] The above embodiment is only one of the implementation manners of the technical scheme of the present application, and the scope of protection claimed by the present application is not limited to the above embodiment, but also includes any changes, substitutions and other implementation manners easily thought of by those skilled in the art within the technical scope disclosed by the present application.​

Claims

1. A method of positioning the minimum absorbed energy location of a Charpy impact specimen, characterized in that, The method comprises the following steps: S1: obtaining Vickers hardness test data of a pretreated Charpy impact specimen; S2: fitting the Vickers hardness test data to obtain a hardness point matrix; S3: drawing the hardness point matrix into a hardness distribution color map; S4: outputting the minimum absorption energy position of the Charpy impact specimen based on the hardness distribution color map.

2. The method for locating the minimum absorbed energy position of a Charpy impact specimen according to claim 1, characterized in that: In S1, the pretreatment process of the Charpy impact specimen comprises: polishing and grinding the surface to be measured of the notch of the Charpy impact specimen in sequence; carrying out corrosion treatment on the polished surface to be measured.

3. A method of locating the position of minimum absorbed energy of a Charpy impact specimen according to claim 2, characterized in that, Wherein, the surface to be measured is polished in sequence by using five different types of sandpaper of 240#-1500# in stages; and the polished surface to be measured is corroded by using a 2% nitric acid and 98% alcohol solution.

4. A method of locating the position of minimum absorbed energy of a Charpy impact specimen according to claim 1, characterized in that, In S1, the Vickers hardness test is performed on the Charpy impact specimen to obtain the Vickers hardness test data, wherein the hardness value of the Vickers hardness test is HV0.5, HV1 or HV2.

5. A method of locating the position of minimum absorbed energy of a Charpy impact specimen according to claim 4, characterized in that, During the Vickers hardness test, the distance from the indentation of the Charpy impact specimen to the edge of the Charpy impact specimen is at least 3 times the diagonal length of the indentation of the Charpy impact specimen; and the distance between the centers of two adjacent indentations of the Charpy impact specimen is at least 3 times the diagonal length of the indentation of the Charpy impact specimen.

6. A method of locating the position of minimum absorbed energy of a Charpy impact specimen according to claim 1, characterized in that, In S2, the Vickers hardness test data is fitted by using linear interpolation, quadratic interpolation or Cubic interpolation.

7. A method of locating the position of minimum absorbed energy of a Charpy impact specimen according to claim 1, characterized in that, The hardness point matrix is drawn into a hardness distribution color map by using original or matlab.

8. A system for positioning the minimum absorbed energy position of a Charpy impact specimen for carrying out the steps of the method for positioning the minimum absorbed energy position of a Charpy impact specimen according to any one of claims 1 to 7, characterized in that The method comprises the following steps: a data acquisition module for obtaining Vickers hardness test data of a pretreated Charpy impact specimen; a data fitting module for fitting the Vickers hardness test data to obtain a hardness point matrix; a color map drawing module for drawing the hardness point matrix into a hardness distribution color map; a position output module for outputting the minimum absorption energy position of the Charpy impact specimen based on the hardness distribution color map.

9. An apparatus, comprising: The method comprises the following steps: a memory for storing a computer program; a processor for executing the computer program to implement the steps of the positioning method of the minimum absorption energy position of the Charpy impact specimen according to any one of claims 1-7.

10. A computer-readable storage medium storing a computer program, the computer program comprising instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 9. The computer program is executed by the processor to implement the steps of the positioning method of the minimum absorption energy position of the Charpy impact specimen according to any one of claims 1-7.

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