CN115099082A - Transient thermal stress analysis method for high-temperature alloy composite powder laser cladding coating - Google Patents
Transient thermal stress analysis method for high-temperature alloy composite powder laser cladding coating Download PDFInfo
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- G06F30/20—Design optimisation, verification or simulation
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
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Abstract
The invention discloses a transient thermal stress analysis method for a high-temperature alloy composite powder laser cladding coating, which comprises the following steps: establishing a composite material library based on the high-temperature alloy composite laser cladding coating, and obtaining thermal property parameters of the material by utilizing numerical calculation; based on the established material library, the simulation research of the temperature field is carried out on the established laser cladding coating model, and a plane heat source coupling model which is more consistent with the actual situation is established; based on the simulation result of the temperature field, the invention realizes the distribution and evolution of the transient thermal stress field in the laser cladding process of the high-temperature alloy composite coating by a sequential thermal coupling analysis method, and finally establishes the mapping relation between the quality evaluation index of the laser cladding coating and the temperature field and the transient thermal stress field.
Description
Technical Field
The invention discloses a transient thermal stress analysis method for a high-temperature alloy composite powder laser cladding coating, which belongs to the technical field of laser cladding, and can be used for constructing the high-temperature alloy composite coating on a metal substrate and establishing a mapping relation between a coating quality evaluation index and a temperature field and a transient thermal stress field for guiding and determining optimal parameters.
Background
Among various additive manufacturing technologies, the laser cladding technology is an advanced additive manufacturing technology. Laser cladding coatings are formed by applying a high energy laser beam to a laser cladding powder and melting and solidifying the powder onto a substrate. The laser cladding process has the advantages of concentrated energy, small heat affected zone, small damage to the matrix, high machining precision and the like, and can realize efficient repair of complex parts. Therefore, the laser cladding technology is widely applied to the fields of conductor damage tolerance design in aerospace, automobile and tool manufacturing industries and the like at present, green remanufacturing can be realized, the service life of a product is obviously prolonged, and the laser cladding technology has high social and economic benefits and application value.
However, due to the difference in thermal expansion properties between the base material and the cladding material, the cladding process is always accompanied by a large temperature gradient change, resulting in residual stress. Therefore, the defects such as cracks, air holes, inclusions and the like are easy to appear in the coating, and the quality and the performance of the laser cladding part are seriously influenced. Meanwhile, laser cladding is not only a rapid melting and solidification process, but also a very complicated physical metallurgy process, which makes it difficult to measure some physical parameters of the coating in the laser cladding manufacturing process in an experimental process. But the study of the evolution law of the temperature field and the stress field of the laser cladding coating is very necessary for the quality assurance of the cladding layer. Therefore, the development process of laser cladding, including the evolution of the temperature field, the transient thermal stress field and the cladding layer size, is continuously and dynamically displayed by adopting a numerical simulation method.
The numerical simulation technology mainly depends on finite element calculation software related to a computer, at present, the analysis and research of the laser cladding temperature field and the transient thermal stress field based on the numerical simulation technology are mainly focused on the coating material and the base material which are the same or a single-channel single-layer laser cladding layer, and the relationship between the quality evaluation index and the temperature field and the stress field is not established, and the mapping relationship between the quality evaluation index and the transient thermal stress field under different laser cladding process parameters is not researched. These studies have great limitations, cannot be applied to composite coatings formed by composite materials, and are commonly used in engineering applications as multi-channel and multi-layer laser cladding coatings.
Therefore, the invention provides a transient thermal stress analysis method for a high-temperature alloy composite powder laser cladding coating, which realizes the distribution and evolution of a transient thermal stress field in the laser cladding process of the high-temperature alloy composite coating through a sequential thermal coupling analysis method, and finally establishes a mapping relation between a quality evaluation index of the high-temperature alloy composite laser cladding coating and a temperature field and the transient thermal stress field so as to guide the determination of optimal parameters.
Disclosure of Invention
The invention aims to provide a transient thermal stress analysis method for a high-temperature alloy composite powder laser cladding coating, and solves the problem that a thermal stress field of a laser cladding high-temperature alloy composite coating structure commonly used in actual production is difficult to solve. The method provided by the invention can solve the problem of thermal coupling in the laser cladding process of the high-temperature alloy composite coating, and establishes the mapping relation between the quality evaluation index of the high-temperature alloy composite powder laser cladding coating and the temperature field and the transient thermal stress field. The temperature range of the high-temperature alloy is 600-3000 ℃.
According to the high-temperature alloy composite powder coating, calculating by using a numerical value to obtain a thermal property parameter of the high-temperature alloy composite coating; constructing a multi-channel multilayer high-temperature alloy composite laser cladding coating model based on Ansys; when temperature field analysis is carried out, because the most fundamental reason for causing the matrix and the high-temperature alloy composite coating to generate thermal stress is the temperature gradient caused by heat input, a plane heat source model which is more accordant with the actual situation is established, such as a double-ellipsoid heat source model, and the temperature gradient caused by heat input can be reduced by adding a front heat source and a rear heat source; taking the heat source model as a load for temperature field analysis, taking the thermal property parameters of the matrix and the thermal property parameters of the high-temperature alloy composite powder as input parameters for finite element calculation, obtaining temperature field simulation data of the high-temperature alloy composite coating in the laser cladding process by using the finite element model, and then carrying out sequential thermal coupling analysis to realize the distribution and evolution of a transient thermal stress field in the laser cladding process of the high-temperature alloy composite coating; and establishing a mapping relation between the quality evaluation index of the high-temperature alloy composite laser cladding coating and the temperature field and the transient thermal stress field, and providing reference for optimizing process parameters.
In order to achieve the purpose, the invention adopts the following design scheme:
a transient thermal stress analysis method for a high-temperature alloy composite powder laser cladding coating specifically comprises the following steps:
the method comprises the following steps: establishing a laser cladding layer model based on the high-temperature alloy composite coating; the high-temperature alloy composite coating is prepared by irradiating composite powder containing metal and ceramic matrix on the surface of a substrate by laser through a laser cladding process.
Step two: and obtaining the thermal physical property parameters of the high-temperature alloy composite powder coating by utilizing numerical calculation based on the established laser cladding layer model.
Step three: and based on the established laser cladding layer model, taking the plane heat source coupling model as the load of temperature field analysis.
Step four: and taking the thermal property parameters of the substrate and the thermal property parameters of the high-temperature alloy composite powder as input parameters of finite element calculation, and obtaining temperature field simulation data of the high-temperature alloy composite material coating in the laser cladding process by using a finite element model.
Step five: and comparing the simulated temperature field data with the experiment, and then performing thermal coupling analysis to realize the distribution and evolution of the transient thermal stress field in the laser cladding process of the high-temperature alloy composite powder coating.
Step six: the mapping relation between the quality evaluation index of the laser cladding coating under different process parameters and the temperature field and the transient thermal stress field is established, so that reference is provided for optimizing the process parameters.
Further, the high-temperature alloy composite coating is prepared by irradiating raw materials comprising high-temperature alloy composite powder on the surface of a substrate through laser by a laser cladding process.
Further, the thermophysical performance parameters include a calculated density, a young's modulus, a thermal conductivity, a specific heat capacity, a coefficient of thermal expansion, and a poisson's ratio.
Further, in the analysis before thermal coupling, the temperature field simulation data is compared with the experimental data, a plurality of temperature sampling points are arranged on the laser cladding coating finite element model, a sample with the same laser cladding process parameters and simulation is processed, the temperature sampling points which are the same as the laser cladding coating finite element model are arranged on the sample, and then the temperature-time data of the experimental temperature sampling points and the temperature-time data of the finite element temperature sampling points are compared to perform error analysis.
Further, the sequential thermal coupling method takes the temperature field simulation data as a load for stress field analysis, wherein the stress-strain calculation of the high-temperature alloy composite coating and the matrix obeys Hooke's law and an anisotropic yield criterion, and the distribution and evolution of a transient thermal stress field in the laser cladding process of the high-temperature alloy composite coating are realized through transient stress calculation.
Further, guidance is provided for optimizing process parameters, and a mapping relation between the quality evaluation index of the high-temperature alloy composite laser cladding coating and the transient thermal stress field under different process parameters is established.
The invention can obtain the following beneficial effects: the invention obviously distinguishes the prior points that the powder is high-temperature alloy powder with a plurality of layers, the heat source model is selected, and the simulation of a temperature field and the comparison of experimental data and the steady-state thermal analysis are added in the coupling analysis as a bedding.
1. Compared with the traditional single-channel single-layer cladding layer, a multi-channel multi-layer laser cladding layer model which is more suitable for practical application is established based on simulation software, the thermophysical performance parameters of the high-temperature alloy powder can be obtained through numerical calculation, and more accurate and practical temperature field distribution can be calculated by adding a plane heat source model;
2. based on sequential thermal coupling analysis, more accurate transient thermal stress distribution and evolution can be obtained by correcting data of simulation and experiment temperature fields, taking the corrected temperature field result as a thermal load and performing transient analysis;
3. by adjusting the parameters of the laser cladding process, the mapping relation between the quality evaluation indexes of the multi-channel multi-layer high-temperature alloy composite laser cladding layer and the temperature field and the transient thermal stress field is constructed, and the improvement of the laser cladding process is guided to obtain the best cladding layer quality.
A plurality of layers of laser cladding layers are built through simulation software, and distribution close to an actual temperature field in production and processing can be realized by adding hot material performance parameters of high-temperature alloy powder and a plane heat source model to the cladding layers; firstly, performing steady-state thermal calculation to provide initial temperature field conditions for subsequent transient temperature field calculation, correcting transient temperature obtained by simulation and temperature obtained by experiment, and performing thermal coupling after errors meet requirements; based on a sequential thermal coupling analysis method, a temperature field is used as a heat load to carry out transient thermal stress analysis, so that more accurate transient thermal stress distribution and evolution which are in line with the reality can be obtained; by adjusting the laser cladding process parameters, the temperature field and the transient thermal stress field of the cladding layer under different process parameters can be obtained, the mapping relation between the quality evaluation index and the temperature field and the transient thermal stress field is established, and the improvement of the laser cladding process parameters can be guided to obtain the optimal cladding layer quality.
Drawings
FIG. 1 is a flow chart of a transient thermal stress field analysis method in a laser cladding process of a high-temperature alloy composite coating;
FIG. 2 is a schematic view of a dual ellipsoid heat source model;
FIG. 3 is a geometric model diagram of a two-pass double-layer laser cladding coating;
FIG. 4 is a hot physical property parameter plot of Ni60A + 25% WC nickel-based composite powder;
FIG. 5 is a Ni60A + 25% WC nickel-based composite coating temperature field profile;
FIG. 6 is a temperature field comparison graph of Ni60A + 25% WC nickel-based powder composite coating;
FIG. 7 is a transient thermal stress field distribution diagram of the Ni60A + 25% WC nickel-based composite coating;
FIG. 8 is a cross-sectional view of transient stress fields of different planes at the end of laser cladding;
FIG. 9 is a graph of maximum equivalent stress change during laser cladding.
Detailed Description
The present invention is further illustrated by the following examples and figures, and the following examples are illustrative and not limiting, and are not intended to limit the scope of the present invention.
The invention provides a transient thermal stress analysis method for a high-temperature alloy composite powder laser cladding coating, which comprises the following specific implementation steps:
the method comprises the following steps: establishing a laser cladding layer model based on the high-temperature alloy composite powder; the high-temperature alloy composite coating is prepared by irradiating composite powder containing metal and ceramic matrix on the surface of a substrate by laser through a laser cladding process.
Step two: and calculating by using a numerical value to obtain the thermophysical property parameters of the high-temperature alloy composite powder coating based on the established laser cladding layer model.
Step three: and based on the established laser cladding layer model, taking the plane heat source coupling model as the load of temperature field analysis.
Step four: and taking the thermal property parameters of the substrate and the thermal property parameters of the high-temperature alloy composite powder as input parameters of finite element calculation, and obtaining temperature field simulation data of the high-temperature alloy composite material coating in the laser cladding process by using a finite element model.
Step five: and comparing the simulated temperature field data with the experiment, and then carrying out thermal coupling analysis to realize the distribution and evolution of the transient thermal stress field in the laser cladding process of the high-temperature alloy composite powder coating.
Step six: the mapping relation between the quality evaluation index of the laser cladding coating under different process parameters and the temperature field and the transient thermal stress field is established, so that reference is provided for optimizing the process parameters.
Fig. 1 is a flow chart of an analysis method of a transient thermal stress field in a laser cladding process of a high-temperature alloy composite coating according to the invention, and the method of the invention is explained with reference to fig. 1.
The invention establishes a laser cladding layer structure model based on the high-temperature alloy composite coating, and obtains the thermal property parameters of the high-temperature alloy composite coating by using a numerical calculation method according to the model.
In the invention, the high-temperature alloy composite coating in the step one is prepared by irradiating mixed powder comprising metal and ceramic-based powder on the surface of a base material through laser by a laser cladding process. The substrate of the invention is metal. And establishing a geometric entity model of the substrate and the high-temperature alloy nickel-based composite coating by using Ansys software.
Secondly, obtaining thermal property parameters of the high-temperature alloy composite powder and the base material through numerical calculation; wherein the thermal physical parameters include density, Young's modulus, thermal conductivity, specific heat capacity, coefficient of thermal expansion, and Poisson's ratio.
In the third step of the method, a double-ellipsoid heat source coupling model needs to be established. The invention calculates the temperature field change in the laser cladding process based on the heat transfer principle, and is arranged between a substrate and the environment, between a cladding layer and the substrate, and between the cladding layer and the substrate, the heat transfer is carried out by thermal convection and thermal radiation, wherein the thermal convection and the thermal radiation are determined by Newton's cooling equation (formula (1)) and Stefan-Boltzmann's law (formula (2)).
q con ＝-h con (T s -T a ) (1)
q rad ＝-εσ[(T s +273.15) 4 +(T a +273.15) 4 ] (2)
In the formula, q con Denotes thermal convection, q rad Indicating thermal radiation. h is con Is the convective heat transfer coefficient, T s Is the surface temperature of the model, T a Is ambient temperature (20 ℃). ε and σ define the emissivity and the Stefan-Boltzmann constant, respectively.
The present invention uses a dual ellipsoid heat source model (as shown in fig. 2) as the laser heat source model, and the front heat source and the rear heat source are defined by equations (3) and (4), respectively.
Where q is the laser power, η is the thermal efficiency of the heat source, and η has a value of 0.95. a is a f ，a r And b, c are parameters of the heat source model, as shown in fig. 2 below. f. of f And f r Refers to the energy distribution coefficient, which is 0.6 and 1.4, respectively.
The temperature field analysis process of the fourth step in the invention is described in detail below, the thermal property parameters of the high-temperature alloy nickel-based composite powder coating obtained in the second step and the planar heat source model obtained in the third step are brought into the established multi-channel multi-layer laser cladding layer model, in the temperature field simulation, temperature boundary conditions including ambient temperature, thermal convection, thermal radiation and the like need to be set, and the temperature field simulation result of the high-temperature alloy nickel-based composite powder coating and the whole model can be obtained through calculation. In the simulation calculation process, the high-temperature alloy composite coating is divided into a plurality of small units, and the living and dead unit technology is utilized, namely, some divided small units are killed or activated according to needs during simulation, a load step is set in a simulation model according to the moving speed of a plane laser heat source, and each unit is sequentially killed or activated according to the load step, so that the effect of the high-temperature alloy composite coating required in the simulation process can be realized, the simulation is closer to reality, and the accuracy of temperature field simulation data is further improved. In the invention, the time of reaching a certain unit can be calculated according to the scanning speed of the laser heat source, and when the laser heat source moves to a certain unit position of the cladding layer, the cladding layer unit is activated, and simultaneously, the temperature load is generated in the activation unit. The temperature load will vary with time and will gradually decrease after the laser heat source is removed. For example, the length and width of the first cladding layer unit at the beginning are set to 1mm × 1mm × 0.5mm, the laser heat source scans along the longitudinal direction of the cladding layer unit, and the time for the laser heat source to reach the end of the unit is 0.125s at a laser heat source scanning speed of 8 mm/s. In the fourth step of the invention, steady-state thermal calculation is firstly carried out, and then transient temperature field analysis is carried out, so as to obtain simulation data of the temperature field of the high-temperature alloy composite coating in the laser cladding process. According to the method, initial temperature field conditions are provided for subsequent transient temperature field calculation through steady-state thermal calculation; when the method is used for carrying out steady-state thermal analysis, only the temperatures of the cladding layer and the base material need to be defined. When the transient temperature field is calculated, some definite conditions are added, including that all surfaces in contact with air are added with heat convection coefficients, and heat convection and heat radiation are added between the cladding layer and the substrate and between the cladding layer and the cladding layer; and then loading the heat load of a double-ellipsoid heat source on the surface of the coating needing laser cladding to obtain simulation data of the temperature field of the high-temperature alloy composite coating in the laser cladding process.
In the fifth step of the invention, the thermal coupling analysis is carried out after experimental comparison is carried out on the temperature field simulation data; the comparison comprises the following steps: setting a plurality of temperature sampling points on a laser cladding coating finite element model, processing a sample with the same laser cladding process parameters and simulation, setting the temperature sampling points on the sample with the same parameters as the laser cladding coating finite element model, then comparing temperature-time data of the experimental temperature sampling points and the finite element temperature sampling points, and performing a thermal power sequential coupling step if the error is less than or equal to 10%; if the error is larger than 10%, modifying the parameter setting of the finite element model, and repeatedly comparing the temperature field simulation data of the finite element model until the error is less than or equal to 10%.
In the sixth step of the invention, the temperature field data of each unit node divided by the laser cladding layer is firstly used as the load of stress field analysis, wherein the calculation of the stress strain of the high-temperature alloy composite coating and the substrate obeys Hooke's law and anisotropic yield criterion, the distribution and evolution of the stress field of the high-temperature alloy composite coating in the laser cladding process can be obtained after transient stress calculation, and finally, the reference is provided for optimizing process parameters by establishing the relationship between the quality evaluation index of the laser cladding coating and the temperature field and stress field under different process parameters.
The stress distribution is calculated by using a sequential thermodynamic coupling analysis method, the cost of stress detection is favorably reduced, the simulation process is convenient, rapid and efficient, the stress detection method which is commonly used at present and has lower cost belongs to a destructive method, the method is not suitable for green economic development, and the nondestructive stress detection method comprises the following steps: the neutron diffraction method, the X-ray diffraction method and the like have higher test cost and are not suitable for researching the stress distribution and the evolution process of the laser cladding layer under different process parameters in a large quantity, so that the relation between the laser cladding quality evaluation index under different process parameters and the temperature field and the transient thermal stress field can be established by the sequential thermal coupling analysis method, and reference is provided for optimizing the process parameters.
The technical scheme of the present invention will be clearly and completely analyzed and described below with reference to embodiment 1 of the present invention, and the method includes the following specific steps:
The method comprises the following steps: and establishing a laser cladding coating model.
Establishing a geometric model of the double-channel double-layer laser cladding coating, wherein the substrate is 42CrMo, and the size of the double-channel double-layer laser cladding coating with the substrate size of 40mm multiplied by 10mm is 40mm multiplied by 4mm multiplied by 0.5mm, as shown in figure 3;
step two: calculating the thermophysical property parameters of the material.
Calculating the hot physical property parameters of the substrate 42CrMo and Ni60A + 25% WC nickel-based composite powder, wherein the hot physical property parameters of the Ni60A + 25% WC nickel-based composite powder are shown in a figure 4;
step three: and establishing a laser cladding heat source model.
Taking the laser power of 1500W, the laser scanning speed of 8mm/s and the spot diameter of 1mm as an example, establishing a double-thermal ellipsoid heat source model, and calculating the distribution and evolution of a temperature field after adding a thermal boundary condition; wherein, the generation process of the Ni60A + 25% WC nickel-based composite powder laser cladding layer and the dynamic process of the temperature field change are shown in figure 5; wherein FIG. 5(b) is one more laser cladding layer than FIG. 5(a), i.e., 10 seconds apart.
Step four: and calculating the temperature field of the laser cladding layer.
The time-varying process of the temperature of the Ni60A + 25% WC nickel-based powder laser cladding layer; wherein the temperature of each layer tends to increase with time.
Step five: and calculating the transient thermal stress field of the laser cladding layer.
Comparing the temperature field data of a plurality of points of the cladding layer at different moments in the simulation with the temperature field data matched with the actual temperature distribution, wherein the result is shown in fig. 6, and the error is less than 10%, so that the temperature field result obtained by the simulation can be used as the load of stress field analysis, and the distribution and the evolution of the stress field can be obtained by calculation, as shown in fig. 7; the stress field profiles of different planes at the end of laser cladding are shown in fig. 8.
Step six: and calculating the transient thermal stress fields of the laser cladding layers with different process parameters.
By changing the laser power and the scanning speed in the double-ellipsoid moving heat source model, the change of the maximum equivalent stress of different laser powers and scanning speeds in the laser cladding process can be obtained, wherein fig. 9 is a maximum equivalent stress change curve in the laser cladding process.
From the above embodiment 1, the invention provides a new transient thermal stress analysis research method for a high-temperature alloy composite material coating in a laser cladding process, establishes a relationship between a quality evaluation index of the laser cladding coating under different process parameters and a temperature field and a transient thermal stress field, and provides reference for optimizing the process parameters. Aiming at the characteristics of unknown thermophysical properties and difficult measurement of the high-temperature alloy composite powder, the invention obtains thermophysical property parameters of the composite powder by using a numerical calculation means, and uses the calculation result as the initial condition of the material for numerical simulation calculation of a temperature field model. Meanwhile, the invention adopts a plane heat source model as the load for calculating the temperature field of the laser cladding layer to obtain the temperature field result of the high-temperature alloy composite material coating layer in the laser cladding process. The method comprises the steps of carrying out error analysis on temperature-time data of experiment and finite element temperature sampling points by setting sampling points at corresponding positions of a temperature field finite element model, comparing and correcting the finite element model, carrying out thermal coupling analysis, obtaining distribution and evolution of a transient thermal stress field, and finally establishing a mapping relation between laser cladding coating quality evaluation indexes under different process parameters and the temperature field and the transient thermal stress field for guiding and improving a laser cladding process to obtain the optimal cladding layer quality.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A transient thermal stress analysis method for a high-temperature alloy composite powder laser cladding coating is characterized by comprising the following steps: comprises the following steps of (a) preparing a solution,
the method comprises the following steps: establishing a laser cladding layer model based on the high-temperature alloy composite coating; the high-temperature alloy composite coating is prepared by irradiating composite powder containing metal and ceramic matrix on the surface of a substrate by laser through a laser cladding process;
step two: based on the established laser cladding layer model, obtaining the thermophysical performance parameters of the high-temperature alloy composite powder coating by using numerical calculation;
step three: based on the established laser cladding layer model, taking the plane heat source coupling model as a load of temperature field analysis;
step four: taking the thermal physical performance parameters of the substrate and the thermal physical performance parameters of the high-temperature alloy composite powder as input parameters of finite element calculation, and obtaining temperature field simulation data of the high-temperature alloy composite material coating in the laser cladding process by using a finite element model;
step five: comparing the simulated temperature field data with the experiment, and then carrying out thermal coupling analysis to realize the distribution and evolution of the transient thermal stress field in the laser cladding process of the high-temperature alloy composite powder coating;
step six: the mapping relation between the quality evaluation index of the laser cladding coating under different process parameters and the temperature field and the transient thermal stress field is established, so that reference is provided for optimizing the process parameters.
2. The method for analyzing the transient thermal stress of the high-temperature alloy composite powder laser cladding coating according to claim 1, is characterized in that: the high-temperature alloy composite coating is prepared by irradiating raw materials comprising high-temperature alloy composite powder on the surface of a substrate through laser by a laser cladding process.
3. The method for analyzing the transient thermal stress of the high-temperature alloy composite powder laser cladding coating according to claim 1, is characterized in that: the thermal-physical property parameters include calculated density, Young's modulus, thermal conductivity, specific heat capacity, coefficient of thermal expansion, and Poisson's ratio.
4. The method for analyzing the transient thermal stress of the high-temperature alloy composite powder laser cladding coating according to claim 1, characterized by comprising the following steps: and in the analysis before thermal coupling, the temperature field simulation data is compared with the experimental data, a plurality of temperature sampling points are arranged on the laser cladding coating finite element model, a sample with the same laser cladding process parameters and simulation is processed, the temperature sampling points which are the same as the laser cladding coating finite element model are arranged on the sample, and then the temperature-time data of the experimental temperature sampling points and the temperature-time data of the finite element temperature sampling points are compared to carry out error analysis.
5. The method for analyzing the transient thermal stress of the high-temperature alloy composite powder laser cladding coating according to claim 1, is characterized in that: according to the sequential thermal coupling method, the temperature field simulation data are used as a load for stress field analysis, wherein the stress-strain calculation of the high-temperature alloy composite coating and the matrix obeys Hooke's law and anisotropic yield criterion, and the distribution and evolution of the transient thermal stress field in the laser cladding process of the high-temperature alloy composite coating are realized through transient stress calculation.
6. The method for analyzing the transient thermal stress of the high-temperature alloy composite powder laser cladding coating according to claim 1, is characterized in that: the method provides guidance for optimizing process parameters, and establishes a mapping relation between the quality evaluation index of the high-temperature alloy composite laser cladding coating and the transient thermal stress field under different process parameters.
7. The method for analyzing the transient thermal stress of the high-temperature alloy composite powder laser cladding coating according to claim 1, wherein the temperature field comprises experimental comparison of temperature field simulation data and error analysis of simulation and experimental results of the temperature field.
8. The method for analyzing the transient thermal stress of the superalloy composite powder laser cladding coating according to claim 5, wherein the sequential thermal coupling method comprises using the temperature field simulation data as a load for transient thermal stress field analysis, wherein stress-strain calculation of the superalloy composite laser cladding coating and the substrate obeys Hooke's law and anisotropic yield criterion.
9. The method for analyzing the transient thermal stress of the high-temperature alloy composite powder laser cladding coating according to claim 1, wherein laser cladding process parameters are adjusted in finite element analysis, and the optimal parameters are guided and determined by establishing a mapping relation between quality evaluation indexes of the high-temperature alloy composite laser cladding coating and a temperature field and a transient thermal stress field.
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