Temperature field simulation method for laser processing of alloy mesh material

Abstract

The invention discloses a laser processing alloy mesh material temperature field simulation method. The method comprises the following steps that a nickel-based alloy mesh material three-dimensional model conforming to the actual size is established; carrying out mesh division on the entity domain to obtain a mesh division model of the nickel-based alloy mesh material; setting physical attribute parameters; after pulse laser energy parameters are calculated, laser processing parameters are set, solid heat transfer related parameters are set, and laser source position parameters are set; and laser processing parameters are adjusted, and the temperature change of the surface of the nickel-based alloy mesh material and the trend and direction of heat conduction are analyzed. According to the temperature field simulation method for laser processing of the alloy mesh material, anisotropy of thermophysical parameters such as the heat conductivity coefficient of the nickel-based alloy mesh material is considered in the model, and the established model structure is closer to a woven structure of an actual sample piece and can be compared with an experiment more visually; and researchers can be helped to further grasp the characteristic change rule of the laser processing nickel-based alloy mesh material.

Description

Technical Field

[0001] The invention belongs to the technical field of temperature field simulation, and relates to a temperature field simulation method for laser processing alloy mesh materials. Background Art

[0002] Pulse laser processing technology uses the high power density energy generated by pulsed lasers to achieve material etching. This technology has the advantages of high control accuracy, fast processing speed, and low pollution. It has important applications in material processing, surface modification and other fields. Nickel-based alloys, as a type of high-temperature alloy, are widely used in aerospace, energy and chemical industries due to their excellent high-temperature strength, oxidation resistance and corrosion resistance. In the study of high-temperature alloys, the temperature field changes on the alloy surface and the microstructure control when the laser interacts with the alloy are the key research contents.

[0003] During the nanosecond pulse laser processing of nickel-based alloy mesh materials, the laser processing parameters have a great influence on the temperature change on the surface of the nickel-based alloy mesh materials. In addition, due to the special weaving structure of the nickel-based alloy mesh materials, the trend and direction of heat conduction during laser processing also have specific rules. Simulation modeling technology provides a powerful tool for understanding and predicting the process of nanosecond pulse laser processing of nickel-based alloy mesh materials, but so far, it is still impossible to accurately grasp the influence of various laser processing parameters on the surface temperature change of nickel-based alloy mesh materials and the trend and direction of material heat conduction.

[0004] In summary, the existing technology has the problem of being unable to accurately grasp the influence of various laser processing parameters on the surface temperature change of the nickel-based alloy mesh material and the trend and direction of the material's heat conduction. Summary of the invention

[0005] The purpose of the present invention is to provide a temperature field simulation method for laser processing alloy mesh materials, which solves the problem in the prior art that it is impossible to accurately grasp the influence of various laser processing parameters on the surface temperature change of nickel-based alloy mesh materials and the trend and direction of material heat conduction.

[0006] The technical solution adopted by the present invention is a method for simulating the temperature field of a laser-processed alloy mesh material, comprising the following steps: Step 1: Use 3D modeling software to create a 3D model of a nickel-based alloy mesh material that meets the actual size; Step 2: Use the meshing function to complete the meshing of the solid domain and obtain the meshing model of the nickel-based alloy mesh material; Step 3, setting the physical property parameters of the nickel-based alloy mesh material; Step 4: Calculate the pulse laser energy parameters and set the laser processing parameters, add a solid heat transfer module and set the solid heat transfer related parameters, and set the laser source position parameters; Step 5: Adjust laser processing parameters and analyze the temperature change on the surface of the nickel-based alloy mesh material as well as the trend and direction of heat conduction.

[0007] The present invention is also characterized in that: Physical property parameters include melting point, density, specific heat capacity, and thermal conductivity.

[0008] Pulse laser energy parameters include single pulse energy, single pulse energy density, and effective energy density.

[0009] The calculation formula for a single pulse energy is as follows:

[0010] in, Represents the energy value of a single pulse, Indicates the laser processing power, Indicates the laser repetition frequency.

[0011] The calculation formula for a single pulse energy density is as follows:

[0012] in, Represents the energy density value of a single pulse, Represents the energy value of a single pulse, Indicates the laser spot radius value.

[0013] The calculation formula for effective energy density is as follows:

[0014] in, represents the effective energy density value, is the absorption rate of the nickel-based alloy mesh material to the pulse laser, Represents the energy density value of a single pulse, is the laser pulse width.

[0015] Laser processing parameters include laser processing power, laser processing speed, laser repetition frequency and laser pulse width; The laser source position parameters include the initial position of the laser source, the real-time coordinate point of the laser source, and the moving direction of the laser source.

[0016] The calculation formula of the real-time coordinate point of the laser source is as follows:

[0017] in, Indicates the real-time coordinate point of the laser source, S x Indicates the coordinate value of the laser source in the x-axis direction, Sy is the coordinate value of the laser source in the y-axis direction; is a fixed value, The calculation formula is as follows:

[0018] in, Indicates the coordinate value of the laser source in the x-axis direction, represents the moving speed of the laser source, Indicates the laser processing time.

[0019] Solid heat transfer related parameters include fixed temperature, initial temperature value, thermal insulation boundary conditions and heat flux boundary conditions.

[0020] The beneficial effects of the present invention are as follows: compared with the existing laser processing simulation model, the model of the present invention takes into account the anisotropy of thermal physical parameters such as thermal conductivity of nickel-based alloy mesh materials, and the established model structure is closer to the weaving structure of the actual sample, which can be more intuitively compared with the experiment; the application of the present invention can help researchers further grasp the characteristic change law of laser-processed nickel-based alloy mesh materials, understand the influence of various laser processing parameters on the surface temperature change of nickel-based alloy mesh materials during the processing process, analyze the trend and direction of material heat conduction, and provide a new research idea for the suppression of thermal effects during laser processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a top view of a three-dimensional simulation model of a nickel-based alloy mesh material in an embodiment of the present invention; Figure 2 is a structural schematic diagram of a three-dimensional simulation model of a nickel-based alloy mesh material in an embodiment of the present invention; Figure 3 is a top view of a mesh division model of a nickel-based alloy mesh material in an embodiment of the present invention; Figure 4 is a structural schematic diagram of a grid division model of a nickel-based alloy mesh material in an embodiment of the present invention; Figure 5 is a top view of the simulation result at the front point position when the laser processing power is 30W in the embodiment of the present invention; Figure 6 is a top view of the simulation result at the midpoint position when the laser processing power is 30W in the embodiment of the present invention; Figure 7 is a top view of the simulation result at the rear point position when the laser processing power is 30W in the embodiment of the present invention; Figure 8 is a top view of the simulation result at the front point position when the laser processing power is 40W in the embodiment of the present invention; Fig. 9 is a top view of the simulation result at the midpoint position when the laser processing power is 40W in the embodiment of the present invention; Fig.10 is a top view of the simulation result at the rear point position when the laser processing power is 40W in the embodiment of the present invention; Fig.11 is a top view of the simulation result at the front point position when the laser processing power is 50W in the embodiment of the present invention; Fig.12 is a top view of the simulation result at the midpoint position when the laser processing power is 50W in the embodiment of the present invention; Fig.13 is a top view of the simulation result at the rear point position when the laser processing power is 50W in the embodiment of the present invention; Fig.14 3. It is a structural schematic diagram of a three-dimensional simulation model at a front point position when the laser processing power is 30W in an embodiment of the present invention; Fig.15 3. It is a structural schematic diagram of a three-dimensional simulation model at a midpoint position when the laser processing power is 30W in an embodiment of the present invention; Fig.16 3. It is a structural schematic diagram of a three-dimensional simulation model at a rear point position when the laser processing power is 30W in an embodiment of the present invention; Fig.17 3. It is a structural schematic diagram of a three-dimensional simulation model at a front point position when the laser processing power is 40W in an embodiment of the present invention; Fig.18 3. It is a structural schematic diagram of a three-dimensional simulation model at a midpoint position when the laser processing power is 40W in an embodiment of the present invention; Fig.19 3. It is a structural schematic diagram of a three-dimensional simulation model at a rear point position when the laser processing power is 40W in an embodiment of the present invention; Fig. 20 3. It is a structural schematic diagram of a three-dimensional simulation model at a front point position when the laser processing power is 50W in an embodiment of the present invention; Fig.21 3. It is a structural schematic diagram of a three-dimensional simulation model at a midpoint position when the laser processing power is 50W in an embodiment of the present invention; Fig. 22 It is a structural schematic diagram of the three-dimensional simulation model at the rear point position when the laser processing power is 50W in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] The temperature field simulation method of laser processing alloy mesh material includes the following steps: Step 1: Use 3D modeling software to create a 3D model of a nickel-based alloy mesh material that meets the actual size; Step 2: Use the meshing function to complete the meshing of the solid domain and obtain the meshing model of the nickel-based alloy mesh material; Step 3, setting the physical property parameters of the nickel-based alloy mesh material; Physical property parameters include melting point, density, specific heat capacity, and thermal conductivity; Step 4: Calculate the pulse laser energy parameters and set the laser processing parameters, add a solid heat transfer module and set the solid heat transfer related parameters, and set the laser source position parameters; Pulse laser energy parameters include single pulse energy, single pulse energy density, and effective energy density; The calculation formula for a single pulse energy is as follows:

[0024] in, Represents the energy value of a single pulse, Indicates the laser processing power, Indicates the laser repetition frequency; The calculation formula for a single pulse energy density is as follows:

[0025] in, Represents the energy density value of a single pulse, Represents the energy value of a single pulse, Indicates the laser spot radius value; The calculation formula for effective energy density is as follows:

[0026] in, represents the effective energy density value, is the absorption rate of the nickel-based alloy mesh material to the pulse laser, Represents the energy density value of a single pulse, is the laser pulse width; Laser processing parameters include laser processing power, laser processing speed, laser repetition frequency and laser pulse width; The laser source position parameters include the initial position of the laser source, the real-time coordinate point of the laser source, and the moving direction of the laser source; The calculation formula of the real-time coordinate point of the laser source is as follows:

[0027] in, Indicates the real-time coordinate point of the laser source, S xIndicates the coordinate value of the laser source in the x-axis direction, S y is the coordinate value of the laser source in the y-axis direction; is a fixed value, The calculation formula is as follows:

[0028] in, Indicates the coordinate value of the laser source in the x-axis direction, represents the moving speed of the laser source, Indicates laser processing time; Solid heat transfer related parameters include fixed temperature, initial temperature value, thermal insulation boundary conditions and heat flux boundary conditions; Step 5: Adjust laser processing parameters and analyze the temperature change on the surface of the nickel-based alloy mesh material as well as the trend and direction of heat conduction.

[0029] The present invention can not only confirm the direct influence of laser processing power on the surface temperature of nickel-based alloy mesh materials, but also reveal the trend and direction of heat transfer during laser processing through simulation technology, which has important guiding significance for optimizing laser processing parameters, improving processing quality, and predicting and controlling possible thermal damage during processing.

[0030] The purpose of the present invention is to analyze the influence of laser processing parameters on the surface temperature change of nickel-based alloy mesh materials and the trend and direction of material heat conduction, to provide new research ideas for pulsed laser processing of nickel-based alloy mesh materials, and to further optimize the pulsed laser processing technology. The present invention uses simulation software, based on the solid heat transfer physical field, to establish a three-dimensional model and a laser processing temperature field according to the actual sample size, and to explore the action process of pulsed laser and nickel-based alloy mesh materials, to obtain the relationship between laser processing parameters and the surface temperature change of materials and the law of heat conduction trend and direction, and to lay a theoretical foundation for achieving high-quality and efficient processing of the surface microstructure of nickel-based alloy mesh materials.

[0031] The present invention establishes a three-dimensional temperature field model, which can simulate the action process of pulsed laser and nickel-based alloy mesh material. Through simulation calculation, the influence of various laser processing parameters on the temperature change of the surface of the alloy mesh material can be clearly obtained, which is of great significance for exploring the thermal conduction trend and direction of the material.

[0032] Example 1 This embodiment proposes a method for simulating the temperature field of a laser-processed alloy mesh material, comprising the following steps: Step 1: Use 3D modeling software to create a 3D model of a nickel-based alloy mesh material that meets the actual size; Step 2: Use the meshing function to complete the meshing of the solid domain and obtain the meshing model of the nickel-based alloy mesh material; Step 3, setting the physical property parameters of the nickel-based alloy mesh material; Step 4: Calculate the pulse laser energy parameters and set the laser processing parameters, add a solid heat transfer module and set the solid heat transfer related parameters, and set the laser source position parameters; Step 5: Adjust laser processing parameters and analyze the temperature change on the surface of the nickel-based alloy mesh material as well as the trend and direction of heat conduction.

[0033] Example 2 This embodiment proposes a method for simulating the temperature field of a laser-processed alloy mesh material, comprising the following steps: Step 1: Use 3D modeling software to create a 3D model of a nickel-based alloy mesh material that meets the actual size; Step 2: Use the meshing function to complete the meshing of the solid domain and obtain the meshing model of the nickel-based alloy mesh material; Step 3, setting the physical property parameters of the nickel-based alloy mesh material; Physical property parameters include melting point, density, specific heat capacity, and thermal conductivity; Step 4: Calculate the pulse laser energy parameters and set the laser processing parameters, add a solid heat transfer module and set the solid heat transfer related parameters, and set the laser source position parameters; Pulse laser energy parameters include single pulse energy, single pulse energy density, and effective energy density; Step 5: Adjust laser processing parameters and analyze the temperature change on the surface of the nickel-based alloy mesh material as well as the trend and direction of heat conduction.

[0034] Example 3 This embodiment proposes a method for simulating the temperature field of a laser-processed alloy mesh material, comprising the following steps: Step 1: Use 3D modeling software to create a 3D model of a nickel-based alloy mesh material that meets the actual size; Step 2: Use the meshing function to complete the meshing of the solid domain and obtain the meshing model of the nickel-based alloy mesh material; Step 3, setting the physical property parameters of the nickel-based alloy mesh material; Step 4: Calculate the pulse laser energy parameters and set the laser processing parameters, add a solid heat transfer module and set the solid heat transfer related parameters, and set the laser source position parameters; Pulse laser energy parameters include single pulse energy, single pulse energy density, and effective energy density; The calculation formula for a single pulse energy is as follows:

[0035] in, Represents the energy value of a single pulse, Indicates the laser processing power, Indicates the laser repetition frequency; The calculation formula for a single pulse energy density is as follows:

[0036] in, Represents the energy density value of a single pulse, Represents the energy value of a single pulse, Indicates the laser spot radius value; Step 5: Adjust laser processing parameters and analyze the temperature change on the surface of the nickel-based alloy mesh material as well as the trend and direction of heat conduction.

[0037] Example 4 This embodiment proposes a method for simulating the temperature field of a laser-processed alloy mesh material, comprising the following steps: Step 1: Use 3D modeling software to create a 3D model of a nickel-based alloy mesh material that meets the actual size; Step 2: Use the meshing function to complete the meshing of the solid domain and obtain the meshing model of the nickel-based alloy mesh material; Step 3, setting the physical property parameters of the nickel-based alloy mesh material; Step 4: Calculate the pulse laser energy parameters and set the laser processing parameters, add a solid heat transfer module and set the solid heat transfer related parameters, and set the laser source position parameters; Pulse laser energy parameters include single pulse energy, single pulse energy density, and effective energy density; the calculation formula for single pulse energy density is as follows:

[0038] in, Represents the energy density value of a single pulse, Represents the energy value of a single pulse, Indicates the laser spot radius value; The calculation formula for effective energy density is as follows:

[0039] in, represents the effective energy density value, is the absorption rate of the nickel-based alloy mesh material to the pulse laser, Represents the energy density value of a single pulse, is the laser pulse width; Step 5: Adjust laser processing parameters and analyze the temperature change on the surface of the nickel-based alloy mesh material as well as the trend and direction of heat conduction.

[0040] Example 5 This embodiment proposes a method for simulating the temperature field of a laser-processed alloy mesh material, comprising the following steps: Step 1: Use 3D modeling software to create a 3D model of a nickel-based alloy mesh material that meets the actual size; Step 2: Use the meshing function to complete the meshing of the solid domain and obtain the meshing model of the nickel-based alloy mesh material; Step 3, setting the physical property parameters of the nickel-based alloy mesh material; Step 4: Calculate the pulse laser energy parameters and set the laser processing parameters, add a solid heat transfer module and set the solid heat transfer related parameters, and set the laser source position parameters; Laser processing parameters include laser processing power, laser processing speed, laser repetition frequency and laser pulse width; The laser source position parameters include the initial position of the laser source, the real-time coordinate point of the laser source, and the moving direction of the laser source; The calculation formula of the real-time coordinate point of the laser source is as follows:

[0041] in, Indicates the real-time coordinate point of the laser source, S x Indicates the coordinate value of the laser source in the x-axis direction, S y is the coordinate value of the laser source in the y-axis direction; is a fixed value, The calculation formula is as follows:

[0042] in, Indicates the coordinate value of the laser source in the x-axis direction, represents the moving speed of the laser source, Indicates laser processing time; Step 5: Adjust laser processing parameters and analyze the temperature change on the surface of the nickel-based alloy mesh material as well as the trend and direction of heat conduction.

[0043] Example 6 This embodiment proposes a method for simulating the temperature field of a laser-processed alloy mesh material, comprising the following steps: Step 1: Use 3D modeling software to create a 3D model of a nickel-based alloy mesh material that meets the actual size; Step 2: Use the meshing function to complete the meshing of the solid domain and obtain the meshing model of the nickel-based alloy mesh material; Step 3, setting the physical property parameters of the nickel-based alloy mesh material; Step 4: Calculate the pulse laser energy parameters and set the laser processing parameters, add a solid heat transfer module and set the solid heat transfer related parameters, and set the laser source position parameters; Solid heat transfer related parameters include fixed temperature, initial temperature value, thermal insulation boundary conditions and heat flux boundary conditions; Step 5: Adjust laser processing parameters and analyze the temperature change on the surface of the nickel-based alloy mesh material as well as the trend and direction of heat conduction.

[0044] like Figure 1 and Figure 2 As shown, the plane size of the three-dimensional model of the nickel-based alloy mesh material that meets the actual size established in the above embodiment is: 0.4×0.4cm, the cross-sectional size of a single nickel-based alloy circular is: a=0.2mm, b=0.22mm, and the nickel-based alloy mesh material preform is formed by plain weaving process in the three-dimensional model of the nickel-based alloy mesh material, and 7 are evenly distributed in the transverse and longitudinal directions of the model; Figure 3 and Figure 4 As shown, after the meshing of the entity domain is completed using the meshing function, the meshing model of the nickel-based alloy mesh material is obtained. The reasonable meshing helps to reduce the calculation time while ensuring the solution accuracy. The mesh unit size is defined as a reasonable size, and finally the unit mesh is set to a triangle. In the present invention, the temperature change and heat flux of the outside of the nickel-based alloy mesh material are simulated by setting the laser processing parameters. The nickel-based alloy is an alloy with high strength and oxidation corrosion resistance at a high temperature of 650-1000°C. The physical property parameters of the nickel-based alloy mesh material set in the above embodiment are shown in Table 1: Table 1 Physical properties of nickel-based alloy mesh materials

[0045] During the process of pulse laser processing nickel-based alloy mesh materials, the material will experience phenomena such as heat conduction, heat convection, and heat radiation, and the energy diffusion satisfies the heat transfer equation. The generalized heat transfer equation follows the law of conservation of energy. The pulse laser energy parameters are calculated, and then a mobile laser source is added to explore the influence of various laser parameters on the surface temperature change of the nickel-based alloy mesh material, and analyze the trend and direction of material heat conduction.

[0046] After setting the physical property parameters of the nickel-based alloy mesh material and the pulsed laser processing parameters, add solid heat transfer, set the initial temperature value to 293.15K in the solid heat transfer module, set thermal insulation, select all boundaries in the boundary selection, add heat flux, and then set the moving laser source position parameters.

[0047] like Figures 5 to 22 As shown in the figure, the laser processing power is adjusted to 30W, and simulation calculations are performed to observe the temperature field size and heat conduction direction of the pulsed laser at different positions of the nickel-based alloy mesh material; next, the laser processing power is given to 40W, and simulation calculations are performed to observe the temperature field size and heat conduction direction of the pulsed laser at different positions of the nickel-based alloy mesh material; finally, the laser processing power is given to 50W, and simulation calculations are performed to observe the temperature field size and heat conduction direction of the nanosecond pulsed laser at different positions of the nickel-based alloy mesh material. When the pulsed laser acts on the surface of the nickel-based alloy mesh, the energy density of the single pulse input by the laser is very high. As the nickel-based alloy material continuously absorbs the energy of the laser, the temperature of the material surface continues to rise; with the increase of the nanosecond pulsed laser processing power, the maximum temperature of the material surface is also increasing. The simulation results also reveal the trend and direction of heat conduction during laser processing. From the simulation results, it can be observed that heat is not only conducted in the vertical direction of the laser action point, but also has obvious heat transfer in the lateral direction of the material, which will cause the nickel-based alloy mesh material to have a wider range of thermal effects around the lateral processing area.

Claims

1. A method for simulating the temperature field of a laser-processed alloy mesh material, characterized in that: The following steps are involved: Step 1: Use 3D modeling software to create a 3D model of a nickel-based alloy mesh material that meets the actual size; Step 2: Use the meshing function to complete the meshing of the solid domain and obtain the meshing model of the nickel-based alloy mesh material; Step 3, setting the physical property parameters of the nickel-based alloy mesh material; Step 4: Calculate the pulse laser energy parameters and set the laser processing parameters, add a solid heat transfer module and set the solid heat transfer related parameters, and set the laser source position parameters; Step 5: Adjust laser processing parameters and analyze the temperature change on the surface of the nickel-based alloy mesh material as well as the trend and direction of heat conduction.

2. The temperature field simulation method for laser processing alloy mesh material according to claim 1, characterized in that: The physical property parameters include melting point, density, specific heat capacity and thermal conductivity.

3. The temperature field simulation method for laser processing alloy mesh material according to claim 1, characterized in that: The pulse laser energy parameters include single pulse energy, single pulse energy density, and effective energy density.

4. The method for simulating the temperature field of laser processed alloy mesh material according to claim 3, characterized in that: The calculation formula of the single pulse energy is as follows: in, Represents the energy value of a single pulse, Indicates the laser processing power, Indicates the laser repetition frequency.

5. The method for simulating the temperature field of laser-processed alloy mesh materials according to claim 3, characterized in that: The calculation formula of the single pulse energy density is as follows: in, Represents the energy density value of a single pulse, Represents the energy value of a single pulse, Indicates the laser spot radius value.

6. The method for simulating the temperature field of laser processed alloy mesh material according to claim 3, characterized in that: The calculation formula of the effective energy density is as follows: in, represents the effective energy density value, is the absorption rate of the nickel-based alloy mesh material to the pulse laser, Represents the energy density value of a single pulse, is the laser pulse width.

7. The method for simulating the temperature field of laser processed alloy mesh material according to claim 1, characterized in that: The laser processing parameters include laser processing power, laser processing speed, laser repetition frequency and laser pulse width; The laser source position parameters include the initial position of the laser source, the real-time coordinate point of the laser source, and the moving direction of the laser source.

8. The method for simulating the temperature field of laser-processed alloy mesh materials according to claim 7, characterized in that: The calculation formula of the real-time coordinate point of the laser source is as follows: in, Indicates the real-time coordinate point of the laser source, S x Indicates the coordinate value of the laser source in the x-axis direction, S y is the coordinate value of the laser source in the y-axis direction; Said is a fixed value, The calculation formula is as follows: in, Indicates the coordinate value of the laser source in the x-axis direction, represents the moving speed of the laser source, Indicates the laser processing time.

9. The method for simulating temperature field of laser processed alloy mesh material according to claim 1, characterized in that: The solid heat transfer related parameters include fixed temperature, initial temperature value, thermal insulation boundary condition and heat flux boundary condition.

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