Method and system for evaluating three-dimensional distribution of carbon segregation in a forged piece

Abstract

The application discloses a method and system for evaluating three-dimensional distribution of carbon segregation of a forged piece. The method comprises the following steps: presetting a carbon segregation area of a raw ingot of the forged piece, simulating a forging process of the forged piece, and obtaining an internal carbon segregation area of the forged piece after the simulation; comparing the internal carbon segregation area of the forged piece after the simulation with actual forging data, correcting the preset carbon segregation area of the raw ingot of the forged piece according to a comparison result, obtaining a corresponding relationship between the carbon segregation area of the raw ingot of the forged piece and the internal carbon segregation area after the forging, and obtaining a forged piece forging calculation model containing parameters; substituting actual forging data of the forged piece into the forged piece forging calculation model, and obtaining simulation data of carbon content on an outer surface of the forged piece; obtaining actual data of carbon content on the outer surface of the forged piece; comparing the simulation data of carbon content on the outer surface of the forged piece with the actual data of carbon content on the outer surface of the forged piece, adjusting parameters so that the two data are consistent, and obtaining a three-dimensional distribution rule of carbon segregation in the forged piece. The three-dimensional distribution of carbon segregation is obtained without dissection of the forged piece.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant safety assessment technology, and in particular to a method and system for assessing the three-dimensional distribution of carbon segregation in forgings. Background Technology

[0002] Heavy machinery in power plants often uses large forgings for manufacturing. During the casting and solidification of these large forgings into ingots, macroscopic segregation inevitably occurs. Generally, the bottom of the ingot tends to exhibit significant negative segregation, meaning the carbon content is lower than the average value during casting. From the bottom upwards, the ingot composition gradually changes until significant positive segregation appears at the top, meaning the carbon content is higher than the average value during casting. Negative carbon segregation reduces material strength, while positive carbon segregation, or simply carbon segregation, reduces toughness, making the material brittle and affecting its resistance to rapid fracture. In normal production practice, these carbon segregation areas cannot be completely removed during smelting, casting, solidification, and subsequent manufacturing processes without appropriate measures. For large forgings with unresolved carbon segregation areas, assessing their carbon segregation distribution is crucial for the safe operation of the equipment.

[0003] A numerical simulation method for macroscopic segregation of ingots is presented. This method divides the ingot system into a series of computational grids at a macroscopic scale, and defines the positions of inclusions in the ingot system within the ingot grids. For the ingot grids, the distribution of inclusion velocity, temperature distribution within the ingot, and average composition distribution within the ingot are obtained through energy conservation equations, composition conservation equations, momentum conservation equations, and mass conservation equations, respectively. The velocity of inclusions is calculated. For all computational grids except the ingot grid, the energy conservation equation of the mold grid is calculated to obtain the temperature distribution within the mold grid. Finally, the distribution of average composition within the ingot is output after solidification.

[0004] Existing technologies are only suitable for predicting macrosegregation in sand molds and metal molds of various sizes. However, for large castings and forgings, as manufacturing progresses, the macrosegregation in the ingot will flow with the forging process, causing changes in the three-dimensional distribution of carbon segregation in the finished forging. This method cannot predict carbon segregation in the finished forging. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address at least one deficiency of the existing technology: the need to propose a simulation method to achieve three-dimensional quantitative assessment of carbon distribution under non-destructive or minimal-destructive conditions, and to provide a method and system for assessing three-dimensional carbon segregation distribution in forgings.

[0006] The technical solution adopted by this invention to solve its technical problem is: to construct a three-dimensional distribution evaluation method for carbon segregation in forgings, comprising the following steps:

[0007] S10: Preset the carbon segregation region of the original steel ingot for the forging, simulate the forging process of the forging, and obtain the internal carbon segregation region of the forging after simulated forging.

[0008] S20: Compare the carbon segregation region inside the forging after the simulation forging with the actual forging data, and correct the carbon segregation region of the original steel ingot of the forging according to the comparison results, obtain the correspondence between the carbon segregation region of the original steel ingot of the forging and the carbon segregation region inside the forging, and obtain a forging calculation model containing parameters.

[0009] S30: Substitute the actual forging data of the forging into the forging calculation model of the forging to obtain the simulation data of carbon content on the outer surface of the forging;

[0010] S40: Obtain the actual carbon content data of the outer surface of the forging;

[0011] S50: Compare the simulated carbon content data of the outer surface of the forging with the actual carbon content data of the outer surface of the forging, adjust the parameters to make the two data consistent, and obtain the three-dimensional distribution law of carbon segregation in the forging.

[0012] Preferably, in the three-dimensional distribution evaluation method for carbon segregation in forgings according to the present invention, step S10 includes:

[0013] S101: The carbon segregation region of the original steel ingot of the pre-forged part is set as an inverted parabola. An inverted parabola is set for each different carbon content value to obtain multiple inverted parabolas, forming a series of contour lines with different carbon contents.

[0014] S102: Set metal flow tracking points along the multiple inverted parabolic lines;

[0015] S103: Establish a simulation forging model to simulate and calculate the forging process of the forging work;

[0016] S104: Substitute the metal flow tracking point into the simulation forging model to obtain the internal carbon segregation region of the forging after simulation forging.

[0017] Preferably, in the three-dimensional distribution evaluation method for carbon segregation in forgings according to the present invention, step S20 includes:

[0018] S201: Compare the carbon segregation region inside the forging after simulation forging with the data of forgings made using the same forging process, including comparing the contour lines of different carbon contents inside the forging.

[0019] S202: Correct the original carbon segregation region of the forging ingot, and re-obtain the internal carbon segregation region of the forging by using the forging parameters of the forging and combining the simulated forging process;

[0020] S203: Iterate through steps S201 and S202 to obtain the correspondence between the original carbon segregation region of the forging ingot and the internal carbon segregation region after forging, and obtain a forging calculation model containing parameters.

[0021] Preferably, in the three-dimensional distribution evaluation method for carbon segregation in forgings according to the present invention, step S40 includes:

[0022] S401: Set the geometric center point of the forging as the zero point, and set carbon content detection points in a grid pattern with a star-shaped interval;

[0023] S402: The actual area of ​​carbon segregation on the outer surface of the forging was determined using an instrument;

[0024] S403: The carbon segregation distribution centered on the point with the highest actual carbon content during forging of the forging is translated and mapped to the distribution centered on the geometric center point of the forging to obtain the actual carbon content data of the outer surface of the forging.

[0025] Preferably, in the three-dimensional distribution evaluation method for carbon segregation in forgings according to the present invention, step S50 includes:

[0026] S501: Compare the simulated carbon content data of the outer surface of the forging obtained in step S30 with the actual carbon content data of the outer surface of the forging in step S403, adjust the parameters, and repeat the calculation until the simulated carbon content data of the outer surface of the forging is consistent with the actual carbon content data of the outer surface.

[0027] S502: Solidify the parameters to obtain the three-dimensional distribution law of carbon segregation in the forging.

[0028] This invention also constructs a three-dimensional carbon segregation distribution evaluation system for forgings, comprising:

[0029] The preset module is used to preset the carbon segregation region of the original steel ingot for the forging, simulate the forging process of the forging, and obtain the internal carbon segregation region of the forging after simulated forging.

[0030] The first comparison module is used to compare the internal carbon segregation area of ​​the forging after simulation forging with the actual forging data, correct the carbon segregation area of ​​the original steel ingot of the forging based on the comparison results, obtain the correspondence between the carbon segregation area of ​​the original steel ingot of the forging and the internal carbon segregation area after forging, and obtain a forging calculation model of the forging containing parameters.

[0031] The calculation module is used to substitute the actual forging data of the forging into the forging calculation model of the forging to obtain the simulation data of carbon content on the outer surface of the forging;

[0032] The data acquisition module is used to obtain the actual carbon content data of the outer surface of the forging;

[0033] The second comparison module is used to compare the simulated carbon content data of the outer surface of the forging with the actual carbon content data of the outer surface of the forging, adjust the parameters to make the two data consistent, and obtain the three-dimensional distribution law of carbon segregation in the forging.

[0034] Preferably, in the three-dimensional distribution evaluation system for carbon segregation in forgings according to the present invention, the preset module includes:

[0035] The setting unit is used to set the carbon segregation region of the original steel ingot of the preset forging as an inverted parabola. For each different carbon content value, an inverted parabola is set to obtain multiple inverted parabolas, forming a series of contour lines with different carbon contents.

[0036] The first setting unit is used to set metal flow tracking points on the multiple inverted parabolic lines;

[0037] The modeling unit is used to establish a simulation forging model and to simulate and calculate the forging process of the forging workpiece.

[0038] The simulation unit is used to substitute the metal flow tracking point into the simulation forging model to obtain the internal carbon segregation region of the forging after simulation forging.

[0039] Preferably, in the three-dimensional distribution evaluation system for carbon segregation in forgings described in this invention, the first comparison module includes:

[0040] The first comparison unit is used to compare the carbon segregation region inside the forging after simulated forging with the data of forgings made according to the same forging process, including comparing the contour lines of different carbon contents inside the forging.

[0041] The correction unit is used to correct the carbon segregation region of the original steel ingot of the forging. By using the forging parameters of the forging and combining the simulated forging process, the carbon segregation region inside the forging is obtained again.

[0042] An iterative calculation unit is used to repeatedly run the first comparison unit and the correction unit to obtain the correspondence between the original carbon segregation region of the forging ingot and the internal carbon segregation region after forging, and to obtain a forging calculation model of the forging containing parameters.

[0043] Preferably, in the three-dimensional distribution evaluation system for carbon segregation in forgings according to the present invention, the data acquisition module includes:

[0044] The second setting unit is used to set the geometric center point of the forging as the zero point and set the carbon content detection points in a grid pattern with a star-shaped interval.

[0045] The measuring unit is used to measure the actual area of ​​carbon segregation on the outer surface of the forging using an instrument.

[0046] The mapping unit is used to translate and map the carbon segregation distribution centered on the point with the highest actual carbon content in the forging to the distribution centered on the geometric center point of the forging, thereby obtaining the actual carbon content data of the outer surface of the forging.

[0047] Preferably, in the three-dimensional distribution evaluation system for carbon segregation in forgings described in this invention, the second comparison module includes:

[0048] The second comparison unit is used to compare the simulated carbon content data of the outer surface of the forging obtained by the calculation module with the actual carbon content data of the outer surface of the forging in the mapping unit, adjust the parameters, and repeatedly calculate until the simulated carbon content data of the outer surface of the forging is consistent with the actual carbon content data of the outer surface.

[0049] A curing parameter unit is used to cure the parameters and obtain the three-dimensional distribution law of carbon segregation in the forging.

[0050] By implementing this invention, the following beneficial effects are achieved:

[0051] This invention discloses a method and system for evaluating the three-dimensional distribution of carbon segregation in forgings. The method includes: based on the distribution of carbon elements inside the forging, pre-setting the carbon segregation region of the original steel ingot, simulating the forging process, obtaining the simulated carbon segregation region inside the forging, comparing it with real data, iteratively correcting the pre-set carbon segregation region of the original steel ingot, obtaining the correspondence between the original carbon segregation region of the forging and the carbon segregation region inside the forging, and obtaining a forging calculation model containing parameters. Substituting actual forging data into the forging calculation model, obtaining simulated data of carbon content on the outer surface of the forging, comparing it with the actual data of carbon content on the outer surface of the forging obtained by using equipment, adjusting the simulation parameters according to the actual forging process parameters at the power plant site, iteratively calculating until the simulated data of carbon content on the outer surface of the forging and the actual data of carbon content on the outer surface of the forging are consistent, and obtaining the three-dimensional distribution law of carbon segregation in the forging. By simply measuring the carbon segregation distribution pattern on the outer surface and combining it with existing carbon segregation distribution patterns of dissected forgings and forging manufacturing process parameters, a three-dimensional quantitative assessment of carbon distribution under non-destructive / micro-destructive conditions can be achieved through reverse iteration without dissecting the forgings. This saves assessment costs while ensuring the safe operation of the equipment. Attached Figure Description

[0052] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0053] Figure 1 This is a flowchart illustrating the three-dimensional distribution evaluation method for carbon segregation in forgings according to the present invention.

[0054] Figure 2 This is a schematic diagram of the overall process of the three-dimensional distribution evaluation method for carbon segregation in forgings according to the present invention;

[0055] Figure 3 This is a schematic diagram of the pre-defined carbon segregation region of the present invention;

[0056] Figure 4 This is a schematic diagram of the flow change at the carbon content tracking point in the forging simulation of this invention;

[0057] Figure 5 This is a schematic diagram of the rice-shaped spacing of the present invention;

[0058] Figure 6 This is a distribution diagram of carbon content test points in the forgings of this invention;

[0059] Figure 7 This is a block diagram of the three-dimensional distribution evaluation system for carbon segregation in forgings according to the present invention. Detailed Implementation

[0060] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0061] It should be noted that the flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily need to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0062] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0063] like Figure 1 The present invention discloses a method for evaluating the three-dimensional distribution of carbon segregation in forgings, comprising the following steps:

[0064] S10: Preset the carbon segregation region of the original steel ingot for the forging, simulate the forging process of the forging, and obtain the internal carbon segregation region of the forging after simulated forging.

[0065] S20: Compare the internal carbon segregation area of ​​the forging after simulation forging with the actual forging data. Based on the comparison results, correct the carbon segregation area of ​​the original steel ingot of the forging, obtain the correspondence between the carbon segregation area of ​​the original steel ingot of the forging and the internal carbon segregation area after forging, and obtain the forging calculation model of the forging containing parameters.

[0066] S30: Substitute the actual forging data of the forging into the forging calculation model of the forging to obtain the simulation data of carbon content on the outer surface of the forging;

[0067] S40: Obtain actual data on the carbon content of the outer surface of the forging;

[0068] S50: Compare the simulated carbon content data of the outer surface of the forging with the actual carbon content data of the outer surface of the forging, adjust the parameters to make the two data consistent, and obtain the three-dimensional distribution law of carbon segregation in the forging.

[0069] This method for evaluating the three-dimensional distribution of carbon segregation in forgings is applicable to the study of thick-walled low-alloy steel forgings. The overall method flow is as follows: Figure 2 As shown.

[0070] Specifically:

[0071] Step S10 includes:

[0072] S101: The carbon segregation region of the original steel ingot of the forging is preset to be an inverted parabola. An inverted parabola is set for each different carbon content value to obtain multiple inverted parabolas, forming a series of contour lines with different carbon contents.

[0073] S102: Set metal flow tracking points along multiple inverted parabolic lines;

[0074] S103: Establish a simulation forging model to simulate and calculate the forging process of forging parts;

[0075] S104: Substitute the metal flow tracking point into the simulation forging model to obtain the internal carbon segregation region of the forging after simulation forging.

[0076] Based on the forging process of the simulated part, a forging model was established in the Forge forging simulation software to simulate the internal carbon segregation distribution of the forging formed after forging in the original steel ingot carbon segregation region. For example... Figure 3 As shown, based on the distribution of carbon elements inside the forging of similar forgings on site, the carbon segregation area of ​​the original steel ingot is pre-defined, and then corrected by combining the previous carbon segregation distribution model in the steel ingot or billet.

[0077] like Figure 4 As shown, several data tracking points with different carbon contents are set up to simulate the flow changes of carbon content tracking points. Based on the forging process parameters of the dissected forging part, numerical simulation is performed on the entire forging process, including chamfering, upsetting, center pressing indentation, and leveling of the finished product. As shown in steps (a) to (e) in the figure, data tracking points with different carbon contents are set to move with the forging process, and finally, segregation lines with different carbon contents are obtained after the forging is completed.

[0078] Further, step S20 includes:

[0079] S201: Compare the carbon segregation area inside the forging after simulation forging with the data of forgings made using the same forging process, including comparing the contour lines of different carbon contents inside the forging.

[0080] S202: Correct the original carbon segregation region of the forging ingot. By using the forging parameters and combining the simulation of the forging process, the carbon segregation region inside the forging is obtained again.

[0081] S203: Iterate through steps S201 and S202 to obtain the correspondence between the original carbon segregation region of the forging ingot and the internal carbon segregation region after forging, and obtain a forging calculation model containing parameters.

[0082] Through repeated iterative calculations using simulation software, the corresponding relationship between the carbon segregation region of the steel ingot and the carbon segregation region inside the forging, which is adapted to the forging process, is finally obtained, as well as a simulation calculation model of the actual forging process containing the main process parameters.

[0083] Furthermore, in this embodiment, step S30 includes:

[0084] S301: Based on the actual forging process parameters of the equipment, adjust the simulation model parameters of the forging process to calculate the overall carbon segregation distribution of the actual forging, including the simulation data of carbon content on the outer surface of the forging.

[0085] In addition, in this embodiment, step S40 includes:

[0086] S401: Set the geometric center point of the forging as the zero point, and set the carbon content detection points in a star-shaped grid;

[0087] S402: The actual area of ​​carbon segregation on the outer surface of the forging was determined using an instrument;

[0088] S403: The carbon segregation distribution centered on the point with the highest actual carbon content in the forging is translated and mapped to the distribution centered on the geometric center point of the forging to obtain the actual carbon content data of the outer surface of the forging.

[0089] like Figure 5 As shown, a spark direct-reading spectrometer was used to measure the carbon segregation distribution on the outer surface of an actual forging at the power plant site using a gridded method. The geometric center point of the forging was set as the zero point, and carbon content detection points were set in a 45° grid with a star-shaped interval. The carbon segregation distribution centered on the point with the highest measured carbon content was mapped to a distribution centered on the geometric center point of the forging. Several monitoring data points were set on the outer surface of the forging, and the actual measurement data was compared with the simulated carbon content data on the outer surface of the forging obtained in step S301. Figure 6 The figure shows the distribution of carbon content test points on the forging.

[0090] Step S50 includes:

[0091] S501: Compare the simulated carbon content data of the forging outer surface obtained in step S30 with the actual carbon content data of the forging outer surface in step S403, adjust the parameters, and repeat the calculation until the simulated carbon content data of the forging outer surface is consistent with the actual carbon content data of the outer surface.

[0092] S502: Curing parameters, used to obtain the three-dimensional distribution of carbon segregation in forgings.

[0093] Based on the actual forging process parameters of the forging parts at the power plant site, the parameters of the forging simulation model were adjusted again, and the calculations were iterated repeatedly until the simulation results of the carbon content on the outer surface were consistent with the actual measured results of the power plant.

[0094] like Figure 7 As shown, one embodiment of the present invention discloses a three-dimensional carbon segregation distribution evaluation system for forgings, comprising:

[0095] The preset module is used to preset the carbon segregation region of the original steel ingot for forging, simulate the forging process of the forging, and obtain the internal carbon segregation region of the forging after simulated forging.

[0096] The first comparison module is used to compare the internal carbon segregation area of ​​the forging after simulation forging with the actual forging data. Based on the comparison results, the carbon segregation area of ​​the original steel ingot of the forging is corrected to obtain the correspondence between the carbon segregation area of ​​the original steel ingot of the forging and the internal carbon segregation area after forging, and to obtain the forging calculation model of the forging containing parameters.

[0097] The calculation module is used to input the actual forging data of the forging into the forging calculation model to obtain the simulation data of carbon content on the outer surface of the forging;

[0098] The data acquisition module is used to obtain the actual carbon content data of the outer surface of the forging;

[0099] The second comparison module is used to compare the simulated carbon content data of the outer surface of the forging with the actual carbon content data of the outer surface of the forging, adjust the parameters to make the two data consistent, and obtain the three-dimensional distribution law of carbon segregation in the forging.

[0100] This method for evaluating the three-dimensional distribution of carbon segregation in forgings is applicable to the study of thick-walled forgings made of low-alloy steel.

[0101] Specifically:

[0102] The preset modules include:

[0103] The setting unit is used to preset the carbon segregation region of the original steel ingot of the forging to be an inverted parabola. For each different carbon content value, an inverted parabola is set to obtain multiple inverted parabolas, forming a series of contour lines with different carbon contents.

[0104] The first setting unit is used to set metal flow tracking points on multiple inverted parabolic lines;

[0105] The modeling unit is used to build a simulation forging model and simulate the forging process of forging parts.

[0106] The simulation unit is used to substitute the metal flow tracking points into the simulation forging model to obtain the internal carbon segregation region of the forging after simulation forging.

[0107] Based on the forging process of the simulated part, a forging model was established in the Forge forging simulation software to simulate the internal carbon segregation distribution of the forging formed after forging in the original steel ingot carbon segregation region. For example... Figure 3 As shown, based on the distribution of carbon elements inside the forging of similar forgings on site, the carbon segregation area of ​​the original steel ingot is pre-defined, and then corrected by combining the previous carbon segregation distribution model in the steel ingot or billet.

[0108] like Figure 4 As shown, several data tracking points with different carbon contents are set up to simulate the flow changes of carbon content tracking points. Based on the forging process parameters of the dissected forging part, numerical simulation is performed on the entire forging process, including chamfering, upsetting, center pressing indentation, and leveling of the finished product. As shown in steps (a) to (e) in the figure, data tracking points with different carbon contents are set to move with the forging process, and finally, segregation lines with different carbon contents are obtained after the forging is completed.

[0109] Furthermore, the first comparison module includes:

[0110] The first comparison unit is used to compare the internal carbon segregation area of ​​the forging after simulated forging with the data of the forging made according to the same forging process, including the comparison of contour lines with different carbon contents inside the forging.

[0111] The correction unit is used to correct the carbon segregation region of the original steel ingot in the forging. By using the forging parameters of the forging and combining the simulated forging process, the carbon segregation region inside the forging is obtained again.

[0112] The iterative calculation unit is used to repeatedly run the first comparison unit and the correction unit to obtain the correspondence between the carbon segregation region of the original steel ingot and the internal carbon segregation region after forging, and to obtain the forging calculation model of the forging containing parameters.

[0113] Through repeated iterative calculations using simulation software, the corresponding relationship between the carbon segregation region of the steel ingot and the carbon segregation region inside the forging, which is adapted to the forging process, is finally obtained, as well as a simulation calculation model of the actual forging process containing the main process parameters.

[0114] Furthermore, in this embodiment, the computing module includes:

[0115] The parameter adjustment unit is used to adjust the parameters of the forging process simulation model according to the actual forging process parameters of the equipment, and calculate the overall carbon segregation distribution of the actual forging, including the simulation data of carbon content on the outer surface of the forging.

[0116] In addition, in this embodiment, the data acquisition module includes:

[0117] The second setting unit is used to set the geometric center point of the forging as the zero point and set the carbon content detection points in a grid pattern with a star-shaped interval.

[0118] The measurement unit is used to determine the actual area of ​​carbon segregation on the outer surface of forgings using instruments.

[0119] The mapping unit is used to translate and map the carbon segregation distribution centered on the point with the highest actual carbon content in the forging to the distribution centered on the geometric center point of the forging, thereby obtaining the actual carbon content data of the outer surface of the forging.

[0120] like Figure 5 As shown, a spark direct-reading spectrometer was used to measure the carbon segregation distribution on the outer surface of the actual forging at the power plant site using a gridded method. The geometric center point of the forging was set as the zero point, and carbon content detection points were set in a 45° grid with a star-shaped interval. The carbon segregation distribution centered on the point with the highest measured carbon content was mapped to a distribution centered on the geometric center point of the forging. Several monitoring data points were set on the outer surface of the forging, and the actual measured data were compared with the simulated carbon content data on the outer surface of the forging obtained in step S301. Figure 6 The figure shows the distribution of carbon content test points on the forging.

[0121] The second comparison module includes:

[0122] The second comparison unit is used to compare the simulated carbon content data of the outer surface of the forging obtained by the calculation module with the actual carbon content data of the outer surface of the forging in the mapping unit, adjust the parameters, and repeatedly calculate until the simulated carbon content data of the outer surface of the forging is consistent with the actual carbon content data of the outer surface.

[0123] The curing parameter unit is used to determine the curing parameters and obtain the three-dimensional distribution law of carbon segregation in the forging.

[0124] Based on the actual forging process parameters of the forging parts at the power plant site, the parameters of the forging simulation model were adjusted again, and the calculations were iterated repeatedly until the simulation results of the carbon content on the outer surface were consistent with the actual measured results of the power plant.

[0125] By implementing this invention, the following beneficial effects are achieved:

[0126] This invention discloses a method for evaluating the three-dimensional distribution of carbon segregation in forgings. Based on the distribution of carbon elements inside the forging, the method pre-determines the carbon segregation region of the original steel ingot, simulates the forging process, and obtains the simulated carbon segregation region inside the forging. This simulated region is then compared with real data. By iteratively correcting the pre-determined carbon segregation region of the original steel ingot, the corresponding relationship between the original carbon segregation region and the carbon segregation region inside the forging is obtained, resulting in a forging calculation model containing parameters. The actual forging data is substituted into the forging calculation model to obtain simulated carbon content data on the outer surface of the forging. This simulated data is then compared with the actual carbon content data on the outer surface of the forging obtained using equipment. Based on the actual forging process parameters at the power plant site, the simulation parameters are adjusted, and iterative calculations are repeated until the simulated carbon content data on the outer surface of the forging matches the actual carbon content data, thus obtaining the three-dimensional distribution law of carbon segregation in the forging. By simply measuring the carbon segregation distribution pattern on the outer surface and combining it with existing carbon segregation distribution patterns of dissected forgings and forging manufacturing process parameters, a three-dimensional quantitative assessment of carbon distribution under non-destructive / micro-destructive conditions can be achieved through reverse iteration without dissecting the forgings. This saves assessment costs while ensuring the safe operation of the equipment.

[0127] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A method for evaluating three-dimensional distribution of carbon segregation in a forged product, characterized by, Includes the following steps: S10: Preset the carbon segregation region of the original steel ingot for the forging, simulate the forging process of the forging, and obtain the internal carbon segregation region of the forging after simulated forging. S20: Compare the carbon segregation region inside the forging after the simulation forging with the actual forging data, and correct the carbon segregation region of the original steel ingot of the forging according to the comparison results, obtain the correspondence between the carbon segregation region of the original steel ingot of the forging and the carbon segregation region inside the forging, and obtain a forging calculation model containing parameters. S30: Substitute the actual forging data of the forging into the forging calculation model of the forging to obtain the simulation data of carbon content on the outer surface of the forging; S40: Obtain the actual carbon content data of the outer surface of the forging; S50: Compare the simulated carbon content data of the outer surface of the forging with the actual carbon content data of the outer surface of the forging, adjust the parameters to make the two data consistent, and obtain the three-dimensional distribution law of carbon segregation in the forging.

2. The method for evaluating the three-dimensional distribution of carbon segregation in forgings according to claim 1, characterized in that, Step S10 includes: S101: The carbon segregation region of the original steel ingot of the pre-forged part is set as an inverted parabola. An inverted parabola is set for each different carbon content value to obtain multiple inverted parabolas, forming a series of contour lines with different carbon contents. S102: Set metal flow tracking points along the multiple inverted parabolic lines; S103: Establish a simulation forging model to simulate and calculate the forging process of the forging work; S104: Substitute the metal flow tracking point into the simulation forging model to obtain the internal carbon segregation region of the forging after simulation forging.

3. The method for evaluating the three-dimensional distribution of carbon segregation in forgings according to claim 2, characterized in that, Step S20 includes: S201: Compare the carbon segregation region inside the forging after simulation forging with the data of forgings made using the same forging process, including comparing the contour lines of different carbon contents inside the forging. S202: Correct the original carbon segregation region of the forging ingot, and re-obtain the internal carbon segregation region of the forging by using the forging parameters of the forging and combining the simulated forging process; S203: Iterate through steps S201 and S202 to obtain the correspondence between the original carbon segregation region of the forging ingot and the internal carbon segregation region after forging, and obtain a forging calculation model containing parameters.

4. The method for evaluating the three-dimensional distribution of carbon segregation in forgings according to claim 1, characterized in that, Step S40 includes: S401: Set the geometric center point of the forging as the zero point, and set carbon content detection points in a grid pattern with a star-shaped interval; S402: The actual area of ​​carbon segregation on the outer surface of the forging was determined using an instrument; S403: The carbon segregation distribution centered on the point with the highest actual carbon content during forging of the forging is translated and mapped to the distribution centered on the geometric center point of the forging to obtain the actual carbon content data of the outer surface of the forging.

5. The method for evaluating the three-dimensional distribution of carbon segregation in forgings according to claim 4, characterized in that, Step S50 includes: S501: Compare the simulated carbon content data of the outer surface of the forging obtained in step S30 with the actual carbon content data of the outer surface of the forging in step S403, adjust the parameters, and repeat the calculation until the simulated carbon content data of the outer surface of the forging is consistent with the actual carbon content data of the outer surface. S502: Solidify the parameters to obtain the three-dimensional distribution law of carbon segregation in the forging.

6. A three-dimensional carbon segregation distribution evaluation system for forgings, characterized in that, include: The preset module is used to preset the carbon segregation region of the original steel ingot for the forging, simulate the forging process of the forging, and obtain the internal carbon segregation region of the forging after simulated forging. The first comparison module is used to compare the internal carbon segregation area of ​​the forging after simulation forging with the actual forging data, correct the carbon segregation area of ​​the original steel ingot of the forging based on the comparison results, obtain the correspondence between the carbon segregation area of ​​the original steel ingot of the forging and the internal carbon segregation area after forging, and obtain a forging calculation model of the forging containing parameters. The calculation module is used to substitute the actual forging data of the forging into the forging calculation model of the forging to obtain the simulation data of carbon content on the outer surface of the forging; The data acquisition module is used to obtain the actual carbon content data of the outer surface of the forging; The second comparison module is used to compare the simulated carbon content data of the outer surface of the forging with the actual carbon content data of the outer surface of the forging, adjust the parameters to make the two data consistent, and obtain the three-dimensional distribution law of carbon segregation in the forging.

7. The system for evaluating three-dimensional distribution of carbon segregation of a forged piece according to claim 6, characterized by, The preset module includes: The setting unit is used to set the carbon segregation region of the original steel ingot of the preset forging as an inverted parabola. For each different carbon content value, an inverted parabola is set to obtain multiple inverted parabolas, forming a series of contour lines with different carbon contents. The first setting unit is used to set metal flow tracking points on the multiple inverted parabolic lines; The modeling unit is used to establish a simulation forging model and to simulate and calculate the forging process of the forging workpiece. The simulation unit is used to substitute the metal flow tracking point into the simulation forging model to obtain the internal carbon segregation region of the forging after simulation forging.

8. The system for evaluating three-dimensional distribution of carbon segregation of a forged piece according to claim 7, characterized by, The first comparison module includes: The first comparison unit is used to compare the carbon segregation region inside the forging after simulated forging with the data of forgings made according to the same forging process, including comparing the contour lines of different carbon contents inside the forging. The correction unit is used to correct the carbon segregation region of the original steel ingot of the forging. By using the forging parameters of the forging and combining the simulated forging process, the carbon segregation region inside the forging is obtained again. An iterative calculation unit is used to repeatedly run the first comparison unit and the correction unit to obtain the correspondence between the original carbon segregation region of the forging ingot and the internal carbon segregation region after forging, and to obtain a forging calculation model of the forging containing parameters.

9. The system for evaluating three-dimensional distribution of carbon segregation of a forged piece according to claim 6, characterized by, The data acquisition module includes: The second setting unit is used to set the geometric center point of the forging as the zero point and set the carbon content detection points in a grid pattern with a star-shaped interval. The measuring unit is used to measure the actual area of ​​carbon segregation on the outer surface of the forging using an instrument. The mapping unit is used to translate and map the carbon segregation distribution centered on the point with the highest actual carbon content in the forging to the distribution centered on the geometric center point of the forging, thereby obtaining the actual carbon content data of the outer surface of the forging.

10. The system for evaluating three-dimensional distribution of carbon segregation of a forged piece according to claim 9, characterized by, The second comparison module includes: The second comparison unit is used to compare the simulated carbon content data of the outer surface of the forging obtained by the calculation module with the actual carbon content data of the outer surface of the forging in the mapping unit, adjust the parameters, and repeatedly calculate until the simulated carbon content data of the outer surface of the forging is consistent with the actual carbon content data of the outer surface. A curing parameter unit is used to cure the parameters and obtain the three-dimensional distribution law of carbon segregation in the forging.

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