Method and device for establishing an oxidation corrosion model of ferrochrome in a closed environment based on finite elements

Abstract

The application discloses a method and device for establishing an oxidation corrosion model of a ferrochrome alloy in a closed environment based on finite elements, and the method comprises the following steps: acquiring a first size of a closed gas environment, and acquiring a second size of a sample of a ferrochrome alloy material; establishing a two-dimensional geometric model according to the first size and the second size; pre-setting oxidation corrosion reaction information of the ferrochrome alloy material; pre-setting a first attribute of the ferrochrome alloy material, a second attribute of a reaction substance and a third attribute of the closed gas environment; performing grid division on the ferrochrome alloy material to obtain a target grid division area; and constructing an oxidation corrosion model according to the two-dimensional geometric model, the oxidation corrosion reaction information, the first attribute, the second attribute, the third attribute and the target grid division area. The application can improve the data accuracy of monitoring and predicting the corrosion degree of the alloy, and can be widely applied to the field of computer technology.

Description

Technical Field

[0001] The present invention relates to the field of computer technology, and in particular to a method and device for establishing an oxidation corrosion model of ferrochrome in a closed environment based on finite elements. Background Art

[0002] Ferrochrome is an important material widely used in various industries due to its excellent corrosion resistance and mechanical properties, abundant raw materials, and low cost. However, during long-term use, ferrochrome reacts with gases in the environment, such as oxygen, hydrogen, carbon dioxide, and water vapor, which in severe cases can affect the function of key components or even cause them to fail. Actual experiments require repeated testing, which is time-consuming and requires a lot of consumables. Currently, corrosion processes can be studied based on finite element methods, but current research is mainly limited to metal electrochemical corrosion and carbon corrosion, resulting in a lack of reliable data and model support for monitoring and predicting the degree of corrosion of alloy devices in service. Summary of the Invention

[0003] In view of this, the main purpose of the embodiments of the present invention is to provide a method and device for establishing an oxidative corrosion model of chromium-iron alloy in a closed environment based on finite element analysis, in order to solve at least one of the problems of the existing technology and to improve the data accuracy of monitoring and predicting the corrosion degree of the alloy.

[0004] To achieve the above objectives, an embodiment of the present invention provides a method for establishing an oxidative corrosion model of ferrochrome in a closed environment based on finite element analysis, the method comprising the following steps:

[0005] obtaining a first dimension of the closed gas environment and obtaining a second dimension of the sample of the ferrochrome material;

[0006] Establishing a two-dimensional geometric model according to the first size and the second size;

[0007] Presetting oxidation corrosion reaction information of the ferrochrome alloy material;

[0008] Presetting a first property of the ferrochrome material, a second property of the reaction substance, and a third property of the sealed gas environment;

[0009] Performing grid division on the ferrochrome alloy material to obtain a target grid division area;

[0010] An oxidation corrosion model is constructed according to the two-dimensional geometric model, the oxidation corrosion reaction information, the first attribute, the second attribute, the third attribute, and the target grid division area.

[0011] In some embodiments, the presetting of the oxidation corrosion reaction information of the ferrochrome alloy material comprises the following steps:

[0012] Obtaining an oxidation reaction equation of the ferrochrome alloy material;

[0013] Obtaining an oxidation reaction rate of the ferrochrome material;

[0014] Obtaining surface material change information of the ferrochrome alloy material;

[0015] Obtaining corrosion product information of the ferrochrome material;

[0016] The oxidation corrosion reaction information is obtained according to the oxidation reaction equation, the oxidation reaction rate, the surface material change information and the corrosion product information.

[0017] In some embodiments, presetting the first property of the ferrochrome material comprises the following steps:

[0018] obtaining a first surface area of ​​the ferrochrome material and a first surface thickness of the ferrochrome material;

[0019] Obtaining a first surface volume of the ferrochrome alloy material according to the first surface area and the first surface thickness;

[0020] The metallic iron surface concentration and the metallic chromium surface concentration of the ferrochrome alloy material are obtained according to the first surface volume.

[0021] In some embodiments, presetting the second property of the reaction material comprises the following steps:

[0022] The mass transfer and diffusion information of the reaction substances are obtained through the diffusion model and mass conservation.

[0023] In some embodiments, presetting the third attribute of the sealed gas environment comprises the following steps:

[0024] The initial conditions of the closed gas environment are preset by the Nass-Stokes equation and the continuity equation.

[0025] In some embodiments, meshing the ferrochrome alloy material to obtain a target meshing area comprises the following steps:

[0026] Performing grid division on the base region of the ferrochrome alloy material to obtain a first grid division region;

[0027] Meshing the flow diffusion region of the closed gas environment to obtain a second meshed region;

[0028] providing a boundary layer on the surface of the ferrochrome material in the second grid-divided area, wherein the boundary layer is connected to the first grid-divided area;

[0029] Carry out a mesh splitting processing on a corner region of the surface of the ferrochrome alloy material in the second mesh division region, to obtain a corner mesh division region;

[0030] Carry out a smooth transition processing on the boundary layer and the corner mesh division region, to obtain the target mesh division region.

[0031] To achieve the above object, another aspect of the embodiment of the present application provides a device for establishing an oxidation corrosion model of a ferrochrome alloy in a closed environment based on finite elements, which comprises:

[0032] A first module is configured to acquire a first size of a closed gas environment and a second size of a sample of a ferrochrome alloy material;

[0033] A second module is configured to establish a two-dimensional geometric model according to the first size and the second size;

[0034] A third module is configured to pre-set oxidation corrosion reaction information of the ferrochrome alloy material;

[0035] A fourth module is configured to pre-set a first attribute of the ferrochrome alloy material, a second attribute of a reaction substance and a third attribute of the closed gas environment;

[0036] A fifth module is configured to carry out a mesh division on the ferrochrome alloy material to obtain a target mesh division region;

[0037] A sixth module is configured to construct an oxidation corrosion model according to the two-dimensional geometric model, the oxidation corrosion reaction information, the first attribute, the second attribute, the third attribute and the target mesh division region.

[0038] To achieve the above object, another aspect of the embodiment of the present application provides an electronic device, which comprises a memory and a processor, the memory stores a computer program, and the processor implements the above-mentioned method for establishing an oxidation corrosion model of a ferrochrome alloy in a closed environment based on finite elements when executing the computer program.

[0039] To achieve the above object, another aspect of the embodiment of the present application provides a computer readable storage medium, which stores a computer program, and the computer program implements the above-mentioned method for establishing an oxidation corrosion model of a ferrochrome alloy in a closed environment based on finite elements when executed by a processor.

[0040] To achieve the above objectives, another aspect of an embodiment of the present invention provides a computer program product or computer program, comprising computer instructions stored in a computer-readable storage medium. A processor of a computer device can read the computer instructions from the computer-readable storage medium and execute the computer instructions, causing the computer device to perform the aforementioned method for establishing an oxidative corrosion model of a ferrochromium alloy in a closed environment based on finite element analysis.

[0041] The embodiments of the present invention include at least the following beneficial effects: The present application provides a method and apparatus for establishing an oxidation corrosion model of a ferrochrome alloy in a closed environment based on finite elements. The scheme obtains a first dimension of a closed gas environment and a second dimension of a sample of a ferrochrome material; establishes a two-dimensional geometric model based on the first dimension and the second dimension; pre-sets oxidation corrosion reaction information of the ferrochrome material; pre-sets a first property of the ferrochrome material, a second property of a reaction substance, and a third property of a closed gas environment; meshes the ferrochrome material to obtain a target mesh division area; and constructs an oxidation corrosion model based on the two-dimensional geometric model, the oxidation corrosion reaction information, the first property, the second property, the third property, and the target mesh division area, which can improve the data accuracy for monitoring and predicting the degree of corrosion of the alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0043] Figure 1 This is a flow chart of a method for establishing an oxidation corrosion model of ferrochrome alloy in a closed environment based on finite element analysis provided in an embodiment of the present application;

[0044] Figures 2a-2b 2. It is a schematic diagram of a two-dimensional geometric model and mesh division of a ferrochrome alloy provided in an embodiment of the present application;

[0045] Figures 3a-3b 1 is a schematic diagram comparing the simulation results and experimental results of the changes in the oxygen content in the cavity provided by the embodiment of the present application;

[0046] Figures 4a-4b Schematic diagram of oxygen concentration and velocity distribution over 100 hours provided in an embodiment of the present application;

[0047] Figure 5 is a schematic diagram of the change in cavity pressure provided by an embodiment of the present application;

[0048] Figure 6 is a schematic diagram of the thickness of Fe2O3 and Cr2O3 oxides provided in the examples of the present application;

[0049] Figure 7 This is a schematic diagram of the hardware structure of the electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solutions and advantages of this application more clear, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the embodiments of this application. They are merely examples of devices and methods consistent with some aspects of the embodiments of this application as detailed in the appended claims.

[0051] It will be understood that the terms "first", "second", etc. used in this application may be used herein to describe various concepts, but unless otherwise specified, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. For example, without departing from the scope of the embodiments of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if" and "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0052] The terms "at least one", "plurality", "each", "any", etc. used in this application include "at least one", "two" or more, "plurality" or "each", "any" or "any one", "each" or "any one" as used herein.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein are for the purpose of describing the embodiments of this application only and are not intended to limit this application.

[0054] Actual experiments on alloy materials require repeated testing, which is time-consuming and requires a lot of consumables. With the continuous improvement of computing power, computers have begun to be applied to scientific research, giving rise to a series of methods for studying the corrosion behavior of metal materials, such as molecular dynamics simulation, first-principles simulation, and finite element simulation. These methods enable digital experimental research, significantly shorten the research cycle, and improve research efficiency. Finite element analysis replaces complex problems with simpler ones before solving them. The solution domain is considered to be composed of many small interconnected subdomains called finite elements. A suitable (simpler) approximate solution is assumed for each unit, and then the overall conditions for solving this domain (such as structural equilibrium conditions) are derived to obtain an approximate solution to the problem. However, current theoretical calculations based on finite element analysis to study the evolution of corrosion are limited to electrochemical corrosion of metals and carbon corrosion. There is a lack of research on the chemical corrosion of metals, especially alloys, in closed environments. As a result, there is a lack of reliable data and model support for monitoring and predicting the corrosion level of alloy devices currently in service.

[0055] In view of this, if Figure 1 As shown, an embodiment of the present invention provides a method for establishing an oxidation corrosion model of ferrochrome in a closed environment based on finite element method. The method may include but is not limited to steps S100 to S600:

[0056] Step S100, obtaining a first dimension of a closed gas environment and obtaining a second dimension of a sample of a ferrochrome material;

[0057] Step S200, establishing a two-dimensional geometric model according to the first size and the second size;

[0058] Step S300, presetting oxidation corrosion reaction information of the ferrochrome alloy material;

[0059] Step S400, presetting a first property of the ferrochrome material, a second property of the reaction substance, and a third property of the sealed gas environment;

[0060] Step S500, meshing the ferrochrome alloy material to obtain a target meshing area;

[0061] Step S600: constructing an oxidation corrosion model according to the two-dimensional geometric model, the oxidation corrosion reaction information, the first attribute, the second attribute, the third attribute, and the target grid division area.

[0062] In some embodiments, in steps S100 to S200, a two-dimensional geometric model is established based on the actual size of the ferrochrome material sample and the size of the closed gas environment. Figure 2aThe sample of the ferrochrome material is 1 cm long and 1 cm wide, and the outside of the sample of the ferrochrome material is a closed gas environment of 7 cm and 3.5 cm wide, then the following is obtained: Figure 2a The two-dimensional geometric model is shown.

[0063] In some embodiments, step S300 may include but is not limited to steps S310 to S350:

[0064] Step S310, obtaining an oxidation reaction equation of the ferrochrome alloy material;

[0065] Step S320, obtaining the oxidation reaction rate of the ferrochrome alloy material;

[0066] Step S330, obtaining surface material change information of the ferrochrome alloy material;

[0067] Step S340, obtaining corrosion product information of the ferrochrome alloy material;

[0068] Step S350: Obtain the oxidation corrosion reaction information according to the oxidation reaction equation, the oxidation reaction rate, the surface material change information, and the corrosion product information.

[0069] In some embodiments, an oxidation reaction equation describing the Fe-Cr alloy material is defined. For example, the oxidation reaction of the Fe-Cr alloy material at 200° C. mainly undergoes the following two reactions:

[0070] 4Fe(s)+3O2(g)→2Fe2O3(s) (1)

[0071] 4Cr(s)+3O2(g)→2Cr2O3(s) (2)

[0072] Among them, s represents solid and g represents gas.

[0073] The reaction in equations (1) and (2) is irreversible. The reaction rate is based on the law of conservation of mass, and only fluid oxygen participates in the reaction. Therefore, the oxidation reaction rate of chromium-iron alloy material can be written as:

[0074]

[0075] in, Represents the oxidation reaction rate of ferrochrome material; represents the surface concentration of the substance O2; k represents the reaction rate constant, using the Arrhenius expression k = A(T / T ref ) n e -E / RT represents the reaction rate constant; A represents the reaction frequency factor; E represents the activation energy of the reaction; R represents the universal gas constant; T represents the ambient temperature; Tref wherein T represents a reference temperature; n represents a reaction order.

[0076] In the oxidation corrosion reaction, since the reaction involved is a surface reaction, the surface material change information of the chromium-iron alloy material can be represented by the following formula:

[0077]

[0078] wherein i1 represents the surface Fe or Cr of the chromium-iron alloy material involved in the reaction; represents the surface concentration of the material i1; t represents time; represents the surface diffusion rate of the material i1; represents the surface reaction rate of the material i1; represents the Nabla operator at time t; represents the flux of the adsorbed material i1 tangent to the surface due to surface diffusion and the like processes; represents the generation or consumption of the material i1 on the surface of the chromium-iron alloy due to surface diffusion and the like processes at time t.

[0079] As the oxidation corrosion reaction proceeds, corrosion products will be generated, and the volume of the corrosion product in the corrosion product information of the chromium-iron alloy material can be represented as:

[0080]

[0081] In the oxidation corrosion reaction, the surface of the two-dimensional geometric model of the sample of the chromium-iron alloy material will deform, which can be represented by the velocity v along the surface normal direction:

[0082]

[0083] wherein ΔV represents the volume of the corrosion product; j1 represents the corrosion product Fe2O3 or Cr2O3; represents the molar mass of the corrosion product j1; represents the density of the corrosion product j1; v represents the deposition velocity of the corrosion product along the surface normal direction; S represents the surface area involved in the reaction, i.e., the surface area of the contact between oxygen and the chromium-iron alloy; represents the surface reaction rate of the material j1.

[0084] In step S400 of some embodiments, the step of pre-setting the first attribute of the chromium-iron alloy material can include but is not limited to steps S411 to S413:

[0085] Step S411, obtaining the first surface area of the chromium-iron alloy material and the first surface layer thickness of the chromium-iron alloy material;

[0086] Step S412, according to the first surface area and the first surface layer thickness, obtaining the first surface layer volume of the ferrochrome material:

[0087] Step S413, according to the first surface layer volume, obtaining the surface concentration of metallic iron and the surface concentration of metallic chromium of the ferrochrome material.

[0088] In steps S411 to S413 of some embodiments, the first properties of the ferrochrome material are pre-set, including: the first surface area of the ferrochrome material, the first surface layer thickness, the first surface layer volume, and the surface concentration of each component of the ferrochrome material. For example, define the components of Fe-Cr, for example Fe-xCr, with a surface area of S Fe-xcr , a density of σ Fe-xCr , containing x mass fraction of chromium, usually a body-centered cubic structure, if the alloy within the surface layer thickness h is considered as the surface, then the surface layer volume of the Fe-xCr alloy material is:

[0089] V surface = S Fe-xCr · h (7)

[0090] The surface concentrations of metallic Fe and metallic Cr are represented as:

[0091]

[0092] wherein V surface represents the surface layer volume of the Fe-xCr alloy material; S Fe-xcr represents the surface area of the Fe-xCr alloy material; h represents the surface layer thickness of the Fe-xCr alloy material; C s，Fe represents the surface concentration of metallic iron; C s，Cr represents the surface concentration of metallic chromium; x represents the mass fraction of metallic chromium in the Fe-xCr alloy material; M Fe represents the molar mass of metallic iron; M Cr represents the molar mass of metallic chromium.

[0093] In some embodiments, the basic properties of each substance in the reaction equation are defined, such as density, molar mass, thermodynamic properties, reaction frequency factor A and activation energy E in Arrhenius expression.

[0094] In step S400 of some embodiments, the step of pre-setting the second properties of the reaction substances can include but is not limited to step S421, obtaining the mass transfer and diffusion information of the reaction substances by diffusion model and mass conservation. Alternatively, the maxwell-stefen diffusion model and mass conservation are applied:

[0095]

[0096] Equation (10) mainly describes the mutual influence of nitrogen and oxygen mixed gas, which contains two components, nitrogen i2 and oxygen j2. is the driving force of nitrogen i2; is the friction coefficient between nitrogen i2 and oxygen j2; is the mole fraction of oxygen j2; is the flow rate of nitrogen i2; is the flow velocity of oxygen j2; ρ is the total fluid density; is the mass fraction of nitrogen i2; is the flux of nitrogen i2; u is the flow velocity of the mixed gas; represents the reaction rate of nitrogen i2; ∑R k represents the sum of the reaction rates of all components nitrogen i2 and oxygen j2; represents the change of nitrogen i2 over time; It represents the net outflow or inflow of nitrogen i2 from a certain volume; represents the convective transport of nitrogen i2 caused by the velocity field u; This term represents the effect of other components on nitrogen i2, i.e., the interaction or reaction between different components. In a nitrogen-oxygen mixed environment, nitrogen is an inert gas and does not react with either the alloy or oxygen, so this term can be ignored.

[0097] In step S400 of some embodiments, the step of presetting the third attribute of the enclosed gas environment may include, but is not limited to, step S431, presetting the initial conditions of the enclosed gas environment using the Nass-Stokes equation and the continuity equation. Optionally, in order for the computer to perform continuous iterative calculations starting from the initial values, initial conditions such as oxygen concentration, air pressure, temperature, and gas flow rate need to be set. The fluid is defined as an incompressible nitrogen-oxygen mixed gas with a nitrogen-oxygen concentration ratio of 4:1, which can be described by the Nass-Stokes equation and the continuity equation:

[0098]

[0099] Where ρ is the total fluid density; u is the flow velocity of the mixed gas; p is the pressure; μ is the dynamic viscosity coefficient; F is the external force acting on the fluid; (·) T is a transpose operation. Define the initial velocity and initial pressure of the fluid, and define the remaining boundaries as walls, representing a closed cavity.

[0100] In some embodiments, step S500 may include but is not limited to steps S510 to S550:

[0101] Step S510, the base region of the ferrochrome alloy material is meshed to obtain a first meshing region;

[0102] Step S520, the flow diffusion region of the closed gas environment is meshed to obtain a second meshing region;

[0103] Step S530, a boundary layer is arranged on the surface of the ferrochrome alloy material in the second meshing region, and the boundary layer is connected with the first meshing region;

[0104] Step S540, the corner region of the surface of the ferrochrome alloy material in the second meshing region is meshed to obtain a corner meshing region;

[0105] Step S550, the boundary layer and the corner meshing region are subjected to smooth transition processing to obtain the target meshing region.

[0106] In steps S510 to S550 of some embodiments, according to the established two-dimensional geometric model and boundary conditions, the required calculation amount of the sample surface of the ferrochrome alloy is large, so the sample surface is finely meshed, and according to the calculation power and solution accuracy requirement, the meshing can be automatically performed by using a finite element software, or manual meshing can be used.

[0107] In step S510 of some embodiments, the base region of the ferrochrome alloy material is meshed, since the base region of the ferrochrome alloy is not involved in excessive calculation, and the ferrochrome alloy is square in two dimensions, the base region of the ferrochrome alloy material is meshed by using ordinary quadrilateral mesh, the minimum element quality and the maximum element quality are both set to 1, the element area ratio is 1, that is, each element is 1mm 2 , and the first meshing region can be obtained.

[0108] In step S520 of some embodiments, the region where oxygen flows and diffuses in the closed gas environment is meshed by using triangular mesh, and the second meshing region can be obtained, wherein the minimum element quality of the triangular mesh is set to 0.05, and the maximum element quality is set to 1.

[0109] In step S530 of some embodiments, since the surface region of the ferrochrome alloy involves surface reaction, exchange and flow, diffusion, etc., more detailed meshing is required, so a boundary layer is added to the surface region of the ferrochrome alloy material, the boundary layer is eight layers of quadrilateral mesh, connected with the mesh of the alloy base region (i.e. the first meshing region), the total thickness of the eight layers of the boundary layer is 1mm, the thickness of each layer increases by 20%, the minimum element quality is 0.5, and the maximum element quality is 1.

[0110] In step S540 of some embodiments, since the mesh quality is low in the corner areas of the ferrochrome surface (i.e., the four corners of the ferrochrome surface), mesh splitting is performed on the four corners of the ferrochrome surface, with the maximum splitting angle of each split being 100 degrees, thereby obtaining corner mesh division areas.

[0111] In step S550 of some embodiments, a smooth transition operation is performed on the boundary layer and the corner mesh division area. The maximum number of transition units is set to 4. By calculating the mass and area ratio of the local units, simple interpolation or other algorithms are performed to make the boundary layer and the corner mesh division area smoothly transition to the triangular mesh in the second mesh division area. Finally, the following can be obtained: Figure 2b The target meshing region is shown.

[0112] The setting of the boundary layer, mesh splitting and smooth transition are all completed in the second mesh division area, which are secondary operations on the second mesh division area.

[0113] In step S600 of some embodiments, an oxidative corrosion model can be constructed based on the two-dimensional geometric model, oxidative corrosion reaction information, a first property of the ferrochrome alloy material, a second property of the reactant, a third property of the enclosed gas environment, and the target meshing area. This oxidative corrosion model can be applied to actual samples for monitoring and prediction.

[0114] In some embodiments, due to the need for real-time monitoring, the PARDISO solver in the transient solver can be selected, and the automatic damping Newton iteration method can be used through iterative refinement:

[0115] x k+1 =x k -λ k H k g k

[0116] Among them, x k is the iterative solution; λ k is the step size factor for each iteration; H k is the Hessian matrix; g k To solve the gradient of the equation. The maximum number of iterations is 16, and the calculation is terminated when the tolerance of the solution is less than 1E-4.

[0117] In some embodiments, the corrosion process of Fe-12.5Cr alloy in an oxygen-nitrogen mixture at 0.1 MPa is taken as an example. The initial oxygen content is 20% by molar volume, and constant heating is adopted at 200°C. The calculation time step is set to 1 hour and terminated at 100 hours. The time step is calculated using the backward difference formula:

[0118]

[0119] The results of the change of oxygen content with time during the oxygen corrosion process of Fe-12.5Cr alloy in a closed environment can be calculated, such as Figure 3a As shown in Figure 2, the curve of oxygen content changing with reaction time during Fe-12.5Cr oxygen corrosion in a closed environment under the same experimental conditions is compared intuitively. Figure 3b Experimental results Figure 3a The oxygen content decreases rapidly in 0-4 hours, when the corrosion reaction rate is faster. After 4 hours, the oxygen content decreases slowly and linearly, indicating that the denser Cr2O3 oxide film formed on the alloy surface hinders the further diffusion of oxygen. After 100 hours, the oxygen content is 18.333%. The simulation results Figure 3a The trend of oxygen content change is basically consistent with the experimental results, and the oxygen content is 18.288% at 100 hours, the trend is consistent, and the results are consistent. In addition to the oxygen content, the concentration distribution of oxygen can also be obtained, such as Figure 4a As shown in Figure 2, after 100 hours, oxygen is consumed by oxidation of Fe-12.5Cr alloy, and a decreasing gradient appears toward the alloy surface, but the gradient is small. Figure 4b The gas velocity distribution can be observed. The gas diffusion velocity near the metal substrate surface is relatively high, and is irregularly distributed around the alloy, mainly concentrated below. Figure 3a and Figure 3b It can be inferred that the generated oxide film greatly hinders the further oxidation of the gas and the alloy matrix. Figure 5 The pressure changes in the cavity. As the alloy oxidation reaction proceeds, the pressure gradually decreases from the initial 10E4Pa to 9.7285E4Pa, and presents a parabolic type, which is consistent with the downward trend of oxygen. According to the surface concentration of Fe2O3 and Cr2O3 generated, the thickness of Fe2O3 and Cr2O3 oxides can be calculated respectively. Figure 6 As shown, after 100 hours, the thickness of Fe2O3 reached over 700nm, while the thickness of Cr2O3 reached approximately 120nm. These results demonstrate that the finite element-based oxidative corrosion model of ferrochrome in a closed environment established in this embodiment of the present invention can perform digital experiments on the corrosion behavior of metallic materials, providing reliable data and model support for monitoring and predicting the corrosion level of ferrochrome components currently in service.

[0120] An embodiment of the present invention further provides a device for establishing an oxidative corrosion model of a ferrochrome alloy in a closed environment based on finite elements, which can implement the above-mentioned method for establishing an oxidative corrosion model of a ferrochrome alloy in a closed environment based on finite elements. The device includes:

[0121] A first module is configured to obtain a first dimension of the closed gas environment and a second dimension of a sample of the ferrochrome material;

[0122] A second module is used to establish a two-dimensional geometric model according to the first size and the second size;

[0123] The third module is used to pre-set the oxidation corrosion reaction information of the ferrochrome alloy material;

[0124] A fourth module is used to pre-set a first property of the ferrochrome material, a second property of the reaction substance, and a third property of the sealed gas environment;

[0125] A fifth module is used to perform grid division on the ferrochrome alloy material to obtain a target grid division area;

[0126] The sixth module is used to construct an oxidation corrosion model based on the two-dimensional geometric model, the oxidation corrosion reaction information, the first attribute, the second attribute, the third attribute and the target grid division area.

[0127] It can be understood that the contents of the above method embodiments are all applicable to the present device embodiments, the functions specifically implemented by the present device embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0128] An embodiment of the present invention further provides an electronic device comprising a processor and a memory, wherein the memory stores a computer program. When the processor executes the computer program, it implements the aforementioned method for establishing an oxidative corrosion model of a ferrochrome alloy in a closed environment based on finite element analysis. The electronic device can be any smart terminal, including a tablet computer and an in-vehicle computer.

[0129] It can be understood that the contents of the above method embodiments are applicable to the present device embodiments, the functions specifically implemented by the present device embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0130] refer to Figure 7 , Figure 7 The hardware structure of an electronic device according to another embodiment is shown. The electronic device includes:

[0131] The processor 701 may be implemented as a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is configured to execute relevant programs to implement the technical solutions provided in the embodiments of the present application.

[0132] The memory 702 can be implemented in the form of a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 702 can store an operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 702 and is called by the processor 701 to execute the method for establishing an oxidative corrosion model of ferrochrome in a closed environment based on finite element analysis in the embodiments of this application.

[0133] Input / output interface 703, used to implement information input and output;

[0134] Communication interface 704, used to implement communication interaction between this device and other devices, which can be achieved through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, WiFi, Bluetooth, etc.);

[0135] Bus 705 , which transmits information between various components of the device (e.g., processor 701 , memory 702 , input / output interface 703 , and communication interface 704 );

[0136] The processor 701 , the memory 702 , the input / output interface 703 and the communication interface 704 are connected to each other in communication within the device via a bus 705 .

[0137] An embodiment of the present invention further provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the method for establishing an oxidation corrosion model of ferrochromium alloy in a closed environment based on finite elements is implemented.

[0138] It can be understood that the contents of the above method embodiments are all applicable to the present storage medium embodiment, the functions specifically implemented by the present storage medium embodiment are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0139] An embodiment of the present invention further provides a computer program product or computer program, comprising computer instructions stored in a computer-readable storage medium. A processor of a computer device can read the computer instructions from the computer-readable storage medium and execute the computer instructions, causing the computer device to perform the aforementioned method for establishing an oxidative corrosion model of a ferrochromium alloy in a closed environment based on finite element analysis.

[0140] In summary, the method and device for establishing an oxidation corrosion model of ferrochrome in a closed environment based on finite element analysis according to the embodiment of the present invention have the following advantages:

[0141] 1. The embodiment of the present invention establishes an oxidative corrosion model of Fe-Cr alloy materials in a closed environment based on finite element analysis. This method is simple, efficient, and reliable. It can obtain physical quantities such as changes in the concentration of various substances on the surface of the Fe-Cr alloy material in a closed environment, changes in the thickness of the oxide film, and changes in the volume and shape of the Fe-Cr alloy material, thereby obtaining corrosion data of the Fe-Cr alloy material under long-term service conditions. At the same time, it can also monitor the oxygen content in the closed environment in real time.

[0142] 2. The finite element-based oxidative corrosion model of ferrochromium alloys in a closed environment established in the embodiments of the present invention can provide certain support for monitoring the service performance and predicting the service life of Fe-Cr alloys, and realize digital experiments on the long-term service corrosion behavior of Fe-Cr alloys, which greatly shortens the test time, improves the experimental efficiency, and reduces the experimental cost, which is conducive to detecting and predicting the service status of Fe-Cr alloy materials and reducing risks and losses.

[0143] 3. The method of the embodiment of the present invention can also be widely used in simulations of oxidation corrosion of alloy materials under different corrosive gases, different alloy types, and different initial conditions and boundary conditions.

[0144] In some optional embodiments, the function / operation mentioned in the block diagram may not occur in the order mentioned in the operation diagram. For example, depending on the function / operation involved, the two boxes shown in succession can actually be executed substantially simultaneously or the boxes can sometimes be executed in reverse order. In addition, the embodiment presented and described in the flow chart of the present invention is provided in an exemplary manner for the purpose of providing a more comprehensive understanding of the technology. The disclosed method is not limited to the operation and logic flow presented herein. Optional embodiments are contemplated in which the order of the various operations is changed and the sub-operations described as a part of a larger operation are performed independently.

[0145] Furthermore, although the present invention is described in the context of functional modules, it should be understood that, unless otherwise indicated, one or more of the functions and / or features described may be integrated into a single physical device and / or software module, or one or more functions and / or features may be implemented in separate physical devices or software modules. It will also be understood that a detailed discussion of the actual implementation of each module is not necessary for understanding the present invention. More specifically, given the properties, functions, and internal relationships of the various functional modules in the devices disclosed herein, the actual implementation of the module will be understood within the ordinary skill of an engineer. Therefore, a person skilled in the art using ordinary skill will be able to implement the present invention set forth in the claims without undue experimentation. It will also be understood that the specific concepts disclosed are merely illustrative and are not intended to limit the scope of the present invention, which is determined by the full scope of the appended claims and their equivalents.

[0146] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0147] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0148] More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic devices), a portable computer disk cartridge (magnetic devices), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disc read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or processing in another suitable manner as necessary, and then stored in a computer memory.

[0149] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0150] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0151] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

[0152] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A method for establishing an oxidative corrosion model of ferrochrome in a closed environment based on finite element analysis, characterized in that: The following steps are involved: obtaining a first dimension of the closed gas environment and obtaining a second dimension of the sample of the ferrochrome material; Establishing a two-dimensional geometric model according to the first size and the second size; Presetting oxidation corrosion reaction information of the ferrochrome alloy material; Presetting a first property of the ferrochrome material, a second property of the reaction substance, and a third property of the sealed gas environment; Performing grid division on the ferrochrome alloy material to obtain a target grid division area; Constructing an oxidation corrosion model according to the two-dimensional geometric model, the oxidation corrosion reaction information, the first attribute, the second attribute, the third attribute, and the target grid division area; In the oxidation corrosion reaction, the surface material change information of the ferrochrome alloy material is expressed as: ； in, Represents the surface of the ferrochrome material involved in the reaction or ; Representative substances Surface concentration of Represents time; Representative substances Surface diffusion rate; Representative substances Surface reaction rate; represent Nabla operator at the moment; The gridding of the ferrochrome alloy material to obtain a target gridding area comprises the following steps: Performing grid division on the base region of the ferrochrome alloy material to obtain a first grid division region; Meshing the flow diffusion region of the closed gas environment to obtain a second meshed region; providing a boundary layer on the surface of the ferrochrome material in the second grid-divided area, wherein the boundary layer is connected to the first grid-divided area; performing a grid splitting process on a corner area of ​​the surface of the ferrochrome alloy material in the second grid division area to obtain a corner grid division area; A smooth transition process is performed on the boundary layer and the corner grid division area to obtain the target grid division area.

2. The method for establishing an oxidative corrosion model of ferrochrome in a closed environment based on finite element analysis according to claim 1, characterized in that: The presetting of the oxidation corrosion reaction information of the ferrochrome alloy material comprises the following steps: Obtaining an oxidation reaction equation of the ferrochrome alloy material; Obtaining an oxidation reaction rate of the ferrochrome material; Obtaining surface material change information of the ferrochrome alloy material; Obtaining corrosion product information of the ferrochrome material; The oxidation corrosion reaction information is obtained according to the oxidation reaction equation, the oxidation reaction rate, the surface material change information and the corrosion product information.

3. The method for establishing an oxidative corrosion model of ferrochrome in a closed environment based on finite element analysis according to claim 1, characterized in that: The step of presetting the first property of the ferrochrome alloy material comprises the following steps: obtaining a first surface area of ​​the ferrochrome material and a first surface thickness of the ferrochrome material; Obtaining a first surface volume of the ferrochrome alloy material according to the first surface area and the first surface thickness; The metallic iron surface concentration and the metallic chromium surface concentration of the ferrochrome alloy material are obtained according to the first surface volume.

4. The method for establishing an oxidative corrosion model of ferrochrome in a closed environment based on finite element analysis according to claim 1, characterized in that: Presetting the second property of the reaction substance comprises the following steps: The mass transfer and diffusion information of the reaction substances are obtained through the diffusion model and mass conservation.

5. The method for establishing an oxidative corrosion model of ferrochrome in a closed environment based on finite element analysis according to claim 1, characterized in that: Presetting the third attribute of the closed gas environment includes the following steps: The initial conditions of the closed gas environment are preset by the Nass-Stokes equation and the continuity equation.

6. A device for establishing an oxidation corrosion model of ferrochrome in a closed environment based on finite element analysis, characterized in that: include: A first module is configured to obtain a first dimension of the closed gas environment and a second dimension of a sample of the ferrochrome material; A second module is used to establish a two-dimensional geometric model according to the first size and the second size; The third module is used to pre-set the oxidation corrosion reaction information of the ferrochrome alloy material; A fourth module is used to pre-set a first property of the ferrochrome material, a second property of the reaction substance, and a third property of the sealed gas environment; A fifth module is used to perform grid division on the ferrochrome alloy material to obtain a target grid division area; A sixth module is configured to construct an oxidation corrosion model based on the two-dimensional geometric model, the oxidation corrosion reaction information, the first attribute, the second attribute, the third attribute, and the target grid division area; In the oxidation corrosion reaction, the surface material change information of the ferrochrome alloy material is expressed as: ； in, Represents the surface of the ferrochrome material involved in the reaction or ; Representative substances Surface concentration of Represents time; Representative substances Surface diffusion rate; Representative substances Surface reaction rate; represent Nabla operator at the moment; The fifth module is specifically used for: Performing grid division on the base region of the ferrochrome alloy material to obtain a first grid division region; Meshing the flow diffusion region of the closed gas environment to obtain a second meshed region; providing a boundary layer on the surface of the ferrochrome material in the second grid-divided area, wherein the boundary layer is connected to the first grid-divided area; performing a grid splitting process on a corner area of ​​the surface of the ferrochrome alloy material in the second grid division area to obtain a corner grid division area; A smooth transition process is performed on the boundary layer and the corner grid division area to obtain the target grid division area.

7. An electronic device, characterized in that: including a processor and a memory; The memory is used to store programs; The processor executes the program to implement the method according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that The storage medium stores a program, and the program is executed by a processor to implement the method according to any one of claims 1 to 5.

9. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the method according to any one of claims 1 to 5 is implemented.

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