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

Abstract

The invention discloses a method and device for establishing an oxidation corrosion model of ferrochrome in a closed environment based on finite elements, and the method comprises the steps: obtaining a first size of a closed gas environment, and obtaining a second size of a sample of a ferrochrome material; establishing a two-dimensional geometric model according to the first size and the second size; the oxidation corrosion reaction information of the ferrochrome material is preset; presetting a first attribute of the ferrochrome alloy material, a second attribute of a reaction substance and a third attribute of a closed gas environment; performing grid division on the ferrochrome 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 region. The method can improve the data accuracy of monitoring and predicting the corrosion degree of the alloy, and can be widely applied to the technical field of computers.

Description

Technical Field

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

[0002] Ferrochrome is an important material that is widely used in all walks of life because of its good corrosion resistance and mechanical properties, abundant raw materials and low cost. However, during long-term use, ferrochrome materials will undergo corrosion reactions with gases such as oxygen, hydrogen, carbon dioxide and water vapor in the environment. In severe cases, this will affect the functions of key components or even cause them to fail. Actual experiments need to be repeated, which takes a long time and consumes a lot of materials. Currently, the corrosion process 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 elements, in order to solve at least one of the problems of the prior art and to improve the data accuracy of monitoring and predicting the corrosion degree of the alloy.

[0004] To achieve the above object, an embodiment of the present invention provides a method for establishing an oxidation corrosion model of ferrochrome alloy in a closed environment based on finite element method, 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 closed gas environment;

[0009] Performing mesh division on the ferrochrome alloy material to obtain a target mesh 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 chromium-iron 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 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, the presetting of 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 diffusion model and mass conservation.

[0023] In some embodiments, presetting the third attribute of the closed 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 mesh division on the matrix region of the ferrochrome alloy material to obtain a first mesh division region;

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

[0028] Setting 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] Performing mesh splitting processing on the corner area of ​​the surface of the ferrochrome alloy material in the second mesh division area to obtain a corner mesh division area;

[0030] A smooth transition process is performed on the boundary layer and the corner grid division area to obtain the target grid division area.

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

[0032] A first module is used to obtain a first dimension of the closed gas environment and obtain a second dimension of a sample of the ferrochrome material;

[0033] A second module, used for establishing a two-dimensional geometric model according to the first size and the second size;

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

[0035] 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 closed gas environment;

[0036] A fifth module is used to perform grid division on the ferrochrome alloy material to obtain a target grid division area;

[0037] 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.

[0038] To achieve the above-mentioned purpose, another aspect of an embodiment of the present invention provides an electronic device, which includes a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, it implements the aforementioned method of establishing an oxidation corrosion model of chromium-iron alloy in a closed environment based on finite elements.

[0039] To achieve the above-mentioned purpose, another aspect of an embodiment of the present invention provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the aforementioned method of establishing an oxidative corrosion model of chromium-iron alloy in a closed environment based on finite elements.

[0040] To achieve the above object, another aspect of an embodiment of the present invention provides a computer program product or a computer program, the computer program product or the computer program including computer instructions, the computer instructions being 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 the processor executes the computer instructions, so that the computer device executes the aforementioned method for establishing an oxidation corrosion model of a chromium-iron alloy in a closed environment based on finite elements.

[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 oxidative corrosion model of a ferrochrome alloy in a closed environment based on finite elements, wherein the scheme obtains a first dimension of a closed gas environment and a second dimension of a sample of a ferrochrome alloy material; establishes a two-dimensional geometric model based on the first dimension and the second dimension; pre-sets oxidative corrosion reaction information of the ferrochrome alloy material; pre-sets a first property of the ferrochrome alloy material, a second property of a reaction substance, and a third property of a closed gas environment; meshes the ferrochrome alloy material to obtain a target mesh division area; and constructs an oxidative corrosion model based on the two-dimensional geometric model, the oxidative corrosion reaction information, the first property, the second property, the third property, and the target mesh division area, thereby improving 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 drawings required for use in the description of the embodiments will be briefly introduced below. 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 creative work.

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

[0044] Figure 2a-2b 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] Figure 3a-Figure 3b is a schematic diagram comparing the simulation results and experimental results of the change of the oxygen content in the cavity provided by the embodiment of the present application;

[0046] Figure 4a-4b is a schematic diagram of oxygen concentration and velocity distribution for 100 hours provided in an embodiment of the present application;

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

[0048] Figure 6 is a schematic diagram of Fe2O3 and Cr2O3 oxide thicknesses provided in the embodiments of the present application;

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

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

[0051] It is understood that the terms "first", "second", etc. used in this application can be used to describe various concepts in this article, but unless otherwise specified, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another concept. For example, without departing from the scope of the embodiment 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 can be interpreted as "at the time of" or "when" or "in response to determination".

[0052] The terms "at least one", "multiple", "each", "any", etc. used in this application, at least one includes one, two or more, multiple includes two or more, each refers to each of the corresponding multiple, and any refers to any one of the multiple.

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

[0054] Actual experiments on alloy materials need to be repeated, with long cycles and high consumables. With the continuous improvement of computing power, computers have begun to be used in scientific research, and a series of methods for studying the corrosion behavior of metal materials, such as molecular dynamics simulation, first-principles simulation and finite element simulation, have been born, realizing digital experimental research, greatly shortening the research cycle and improving research efficiency. Among them, finite element analysis is to replace complex problems with simpler problems and then solve them. The solution domain is regarded as consisting of many small interconnected subdomains called finite elements. For each unit, a suitable (simpler) approximate solution is assumed, and then the overall satisfaction conditions of this domain (such as structural equilibrium conditions) are derived to obtain an approximate solution to the problem. However, the current research on the development and evolution of corrosion based on theoretical calculations of finite element analysis is limited to metal electrochemical corrosion and carbon corrosion. There is a lack of research on chemical corrosion of metals, especially alloys, in a closed environment, resulting in a lack of reliable data and model support for monitoring and predicting the corrosion degree of alloy devices 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 chromium-iron alloy in a closed environment based on finite elements. The method may include but is not limited to steps S100 to S600:

[0056] Step S100, obtaining a first size of a closed gas environment, and obtaining a second size of a sample of a ferrochrome alloy 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 closed 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 ferrochrome material sample size 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 2D geometric model 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, obtaining 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 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, so 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 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 represents the reference temperature; n represents the reaction order.

[0076] In the oxidation corrosion reaction, since the reaction involved is a surface reaction, the following formula can be used to represent the surface material change information of the ferrochrome alloy material:

[0077]

[0078] Wherein, i1 represents the surface Fe or Cr of the ferrochrome alloy material participating in the reaction; represents the surface concentration of substance i1; t represents time; represents the surface diffusion rate of substance i1; represents the surface reaction rate of substance i1; represents the Nabla operator at time t; represents the flux of adsorbed species i1 tangential to the surface due to processes such as surface diffusion; It indicates the generation or consumption of fluid or energy by substance i1 on the surface of ferrochrome alloy at time t due to surface diffusion and other processes.

[0079] As the oxidation corrosion reaction proceeds, corrosion products will be generated. The volume of corrosion products in the corrosion product information of ferrochrome alloy materials can be expressed 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 expressed by the velocity v along the surface normal direction:

[0082]

[0083] Wherein, ΔV represents the volume of corrosion products; j1 represents the corrosion products Fe2O3 or Cr2O3; represents the molar mass of corrosion product j1; represents the density of the corrosion product j1; v represents the corrosion product deposition rate along the surface normal direction; S represents the surface area involved in the reaction, that is, the surface area where oxygen contacts the chromium-iron alloy; Represents the surface reaction rate of substance j1.

[0084] In step S400 of some embodiments, the step of presetting the first property of the chromium-iron alloy material may include but is not limited to steps S411 to S413:

[0085] Step S411, obtaining a first surface area of ​​the ferrochrome material and a first surface thickness of the ferrochrome material;

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

[0087] Step S413: acquiring a metal iron surface concentration and a metal chromium surface concentration of the ferrochrome alloy material according to the first surface volume.

[0088] In some embodiments, in steps S411 to S413, the first property of the ferrochrome alloy material is preset, and the first property includes: the first surface area, the first surface thickness, the first surface volume, and the surface concentration of each component of the ferrochrome alloy material. For example, the components of Fe-Cr are defined, and Fe-xCr is taken as an example, and its surface area is S Fe-xcr , the density is σ Fe-xCr , containing x mass fraction of chromium, usually a body-centered cubic structure. If the alloy within the surface thickness h is considered as the surface, the surface volume of the Fe-xCr alloy material is:

[0089] V surface =S Fe-xCr ·h (7)

[0090] The surface concentration of metal Fe and metal Cr is expressed as:

[0091]

[0092] Among them, V surface Represents the surface volume of Fe-xCr alloy material; S Fe-xcr represents the surface area of ​​the Fe-xCr alloy material; h represents the surface 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, basic properties of each substance in the reaction equation are defined, such as density, molar mass, thermodynamic properties, reaction frequency factor A in the Arrhenius expression, and activation energy E of the reaction.

[0094] In step S400 of some embodiments, the step of presetting the second property of the reaction substance may include but is not limited to step S421, obtaining mass transfer and diffusion information of the reaction substance through a diffusion model and mass conservation. Optionally, the Maxwell-Steven diffusion model and mass conservation are applied:

[0095]

[0096] Equation (10) mainly describes the mutual influence of nitrogen-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; It represents the change of nitrogen i2 with 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; It indicates that nitrogen i2 is affected by other components, that is, the interaction or reaction between different components. In a nitrogen-oxygen mixed environment, nitrogen is an inert gas and does not react with alloys or oxygen, so this item can be ignored.

[0097] In step S400 of some embodiments, the step of presetting the third attribute of the closed gas environment may include but is not limited to step S431, presetting the initial conditions of the closed gas environment through the Nass-Stokes equation and the continuity equation. Optionally, in order to enable the computer to perform continuous iterative calculations starting from the initial values, it is necessary to set initial conditions such as oxygen concentration, air pressure, temperature, and gas flow rate. Define the fluid 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 the transposition 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, meshing the matrix region of the ferrochrome alloy material to obtain a first meshed region;

[0102] Step S520, gridding the flow diffusion area of ​​the closed gas environment to obtain a second gridded area;

[0103] Step S530, setting a boundary layer on the surface of the ferrochrome material in the second grid division area, wherein the boundary layer is connected to the first grid division area;

[0104] Step S540, performing mesh splitting processing on the corner area of ​​the surface of the ferrochrome alloy material in the second mesh division area to obtain a corner mesh division area;

[0105] Step S550 , performing smooth transition processing on the boundary layer and the corner grid division area to obtain the target grid division area.

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

[0107] In step S510 of some embodiments, the matrix region of the ferrochrome alloy material is divided. Since the ferrochrome alloy matrix region does not involve too much calculation and the ferrochrome alloy is square in two dimensions, a common quadrilateral grid is used to divide the matrix region of the ferrochrome alloy material. The minimum unit mass and the maximum unit mass are both set to 1, and the unit area ratio is 1, that is, each unit is 1 mm 2 , then the first grid division area can be obtained.

[0108] In step S520 of some embodiments, a triangular mesh is used to divide the area where oxygen flows and diffuses in the closed gas environment to obtain a second mesh division area, wherein the minimum unit mass of the triangular mesh is set to 0.05 and the maximum unit mass is set to 1.

[0109] In step S530 of some embodiments, since the surface area of ​​the ferrochrome alloy involves surface reaction and material exchange, flow, diffusion, etc., a more detailed grid is required, so a boundary layer is added to the surface area of ​​the ferrochrome alloy material. The boundary layer is an eight-layer quadrilateral grid, which is connected with the grid of the alloy matrix area (i.e., the first grid division area). The total thickness of the eight layers of the boundary layer is 1 mm, and the thickness of each layer increases by 20%. The minimum unit mass is 0.5 and the maximum unit mass is 1.

[0110] In step S540 of some embodiments, since the mesh quality is low at 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, and the maximum angle of each splitting is 100 degrees, so that the corner mesh division area can be obtained.

[0111] In step S550 of some embodiments, a smooth transition operation is performed on the boundary layer and the corner mesh division area, and the maximum number of transition units is set to 4. By calculating the mass and area ratio of the local unit, 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, and 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 is a secondary operation on the second mesh division area.

[0113] In step S600 of some embodiments, an oxidation corrosion model may be constructed based on the two-dimensional geometric model, oxidation corrosion reaction information, the first property of the ferrochrome material, the second property of the reaction substance, the third property of the closed gas environment, and the target grid division area. The oxidation corrosion model may 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 termination condition is that the tolerance of the solution is less than 1E-4.

[0117] In some embodiments, the corrosion process of Fe-12.5Cr alloy in 0.1MPa oxygen-nitrogen mixed gas is taken as an example, the initial oxygen content is 20% by molar volume, and constant temperature heating is adopted at 200°C. The calculation time step is set to 1h, ending at 100h, and the time step adopts 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 the figure, the curve of oxygen content changing with reaction time during the Fe-12.5Cr oxygen corrosion process in a closed environment under the same conditions is intuitively compared. Figure 3b Experimental results Figure 3a In the simulation, the oxygen content decreases rapidly from 0 to 4 hours, when the corrosion reaction rate is relatively fast. 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%. Figure 3a The trend of oxygen content 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 1, after 100 hours, oxygen was consumed by oxidation of Fe-12.5Cr alloy, and a decreasing gradient appeared toward the alloy surface, but the gradient was small. Figure 4b The gas velocity distribution can be observed. The gas diffusion velocity near the metal matrix surface is relatively large, 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 is the pressure change 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 decreasing trend of oxygen. According to the surface concentration of the generated Fe2O3 and Cr2O3, the thickness of Fe2O3 and Cr2O3 oxides can be calculated respectively. Figure 6 As shown in the figure, after 100 hours, the thickness of Fe2O3 reached more than 700nm, and the thickness of Cr2O3 reached about 120nm. The above results show that the embodiment of the present invention establishes an oxidation corrosion model of chromium-iron alloy materials in a closed environment based on finite element, which can realize the digital experiment of metal material corrosion behavior and provide reliable data and model support for monitoring and predicting the corrosion degree of chromium-iron alloy devices in service.

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

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

[0122] A second module, used for establishing 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 closed 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] The embodiment of the present invention further provides an electronic device, which includes a processor and a memory, wherein the memory stores a computer program, and when the processor executes the computer program, the method for establishing an oxidation corrosion model of a chromium-iron alloy in a closed environment based on finite elements is implemented. The electronic device can be any intelligent terminal including a tablet computer, a car computer, etc.

[0129] 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.

[0130] refer to Figure 7 , Figure 7 The hardware structure of an electronic device of another embodiment is illustrated, and the electronic device includes:

[0131] The processor 701 may be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used 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 applications. When the technical solution provided in the embodiment of this specification is implemented by software or firmware, the relevant program code is stored in the memory 702, and the processor 701 calls and executes a method for establishing an oxidation corrosion model of ferrochrome alloy in a closed environment based on finite elements in the embodiment of this application;

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

[0134] Communication interface 704, used to realize communication interaction between the device and other devices, which can be realized through wired mode (such as USB, network cable, etc.) or wireless mode (such as mobile network, WIFI, Bluetooth, etc.);

[0135] A bus 705 that transmits information between the various components of the device (e.g., the processor 701, the memory 702, the input / output interface 703, and the 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, which, when executed by a processor, implements the above-mentioned method for establishing an oxidation corrosion model of ferrochrome alloy in a closed environment based on finite elements.

[0138] It can be understood that the contents of the above method embodiments are all applicable to the present storage medium embodiments, the functions specifically implemented by the present storage medium 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.

[0139] The embodiment of the present invention also provides a computer program product or a computer program, which includes 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 the processor executes the computer instructions, so that the computer device executes the aforementioned method for establishing an oxidation corrosion model of a chromium-iron alloy in a closed environment based on finite elements.

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

[0141] 1. The embodiment of the present invention is based on finite element analysis to establish an oxidation corrosion model of Fe-Cr alloy materials in a closed environment. The 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 the corrosion data of the Fe-Cr alloy material under long-term service conditions, and at the same time, it can also monitor the oxygen content in the closed environment in real time.

[0142] 2. The oxidative corrosion model of ferrochrome alloy in a closed environment established based on finite element in the embodiment of the present invention can provide certain support for monitoring the service performance and predicting the service life of Fe-Cr alloy, realize the digital experiment of the long-term service corrosion behavior of Fe-Cr alloy, greatly shorten the test time, improve the experimental efficiency, reduce 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 the simulation of oxidation corrosion of alloy materials under different corrosive gases, different alloy types, different initial conditions and boundary conditions.

[0144] In some selectable 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 by way of example, for the purpose of providing a more comprehensive understanding of technology. The disclosed method is not limited to the operation and logic flow presented herein. Selectable embodiments are expected, wherein the order of various operations is changed and the sub-operation of a part for which is described as a larger operation is performed independently.

[0145] In addition, although the present invention is described in the context of functional modules, it should be understood that, unless otherwise specified, 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 is also understood that a detailed discussion of the actual implementation of each module is unnecessary for understanding the present invention. More specifically, in view of the properties, functions, and internal relationships of the various functional modules in the device disclosed herein, the actual implementation of the module will be understood within the conventional skills of the engineer. Therefore, those skilled in the art can implement the present invention set forth in the claims without excessive experimentation using ordinary techniques. It is also 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, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

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

[0148] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a 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, if necessary, processing in another suitable manner, and then stored in a computer memory.

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

[0150] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0151] Although the 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 present invention, and that the scope of the present 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 described embodiments. Those skilled in the art may 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 oxidation corrosion model of ferrochrome alloy in a closed environment based on finite element method, 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 closed gas environment; Performing mesh division on the ferrochrome alloy material to obtain a target mesh division area; 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.

2. The method for establishing an oxidation corrosion model of ferrochrome alloy 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 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 oxidation corrosion model of ferrochrome alloy 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 material comprises the following steps: Obtaining a first surface area of ​​the ferrochrome material and a first surface thickness of the ferrochrome material; The first surface volume of the ferrochrome alloy material is obtained according to the first surface area and the first surface thickness; and the metal iron surface concentration and the metal chromium surface concentration of the ferrochrome alloy material are obtained according to the first surface volume.

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

5. The method for establishing an oxidation corrosion model of ferrochrome alloy 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 comprises the following steps: The initial conditions of the closed gas environment are preset by the Nass-Stokes equation and the continuity equation.

6. The method for establishing an oxidation corrosion model of ferrochrome alloy in a closed environment based on finite element analysis according to claim 1, characterized in that: The step of meshing the ferrochrome alloy material to obtain a target meshing area comprises the following steps: Performing mesh division on the matrix region of the ferrochrome alloy material to obtain a first mesh division region; Meshing the flow diffusion region of the closed gas environment to obtain a second meshed region; Setting 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 mesh splitting processing on the corner area of ​​the surface of the ferrochrome alloy material in the second mesh division area to obtain a corner mesh 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. A device for establishing an oxidation corrosion model of ferrochrome alloy in a closed environment based on finite element method, characterized in that: include: A first module is used to obtain a first dimension of the closed gas environment and obtain a second dimension of a sample of the ferrochrome material; A second module, used for establishing 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 closed gas environment; A fifth module is used to perform grid division on the ferrochrome alloy material to obtain a target grid division area; 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.

8. 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 6.

9. 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 6.

10. 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 6 is implemented.

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