Methods, systems, media, and apparatuses to determine a life assessment model for fretting wear of ta15 alloy

Abstract

The present application relates to a kind of method, system, medium and equipment of the life evaluation model of determining TA15 alloy fretting wear, method includes: based on the data measured in experiment, the existing oxidation wear model is modified, and the oxidation wear model under low temperature is obtained;Oxidation activation energy, dissipation energy and sliding amplitude parameter are introduced, and the oxidation wear model under low temperature is again modified, and the oxidation wear model under medium-high temperature is obtained;Under high temperature condition, oxidation peeling coefficient is introduced, and the oxidation wear model under medium-high temperature is twice modified, and the oxidation wear model under high temperature, i.e. the fretting wear life evaluation model of TA15 alloy under high temperature is obtained.The present application model considers the influence of temperature on heat transfer tube wear, by modifying Archard model and oxidation wear model, key correction coefficient is fitted by linear regression, so that it can be more accurately predicted the wear life of TA15 alloy plate of arc additive manufacturing.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of arc additive manufacturing TA15 titanium alloy fretting wear, and particularly relates to a method, system, medium and equipment for determining a life evaluation model of TA15 alloy fretting wear. BACKGROUND

[0002] TA15 alloy (Ti-6.5Al-2Zr-1Mo-1V) is a typical structural material in the field of aerospace. As a near-alpha titanium alloy, it has been widely used in the manufacture of key structural parts and load-bearing components of aircraft engines. However, during long-term service, fretting wear occurs between TA15 alloy and other components due to changes in temperature and pressure, which continuously damages the oxidation layer on the alloy surface and leads to material failure. Therefore, by constructing a life evaluation model of TA15 alloy plate and accurately predicting the wear life of the plate, regular detection can be avoided and a large amount of manpower and resources can be saved.

[0003] Currently, the research on the oxidation wear behavior of TA15 alloy is mostly concentrated in laboratory conditions, and the wear volume is measured at different temperatures to analyze the wear mechanism. Although the Archard model can reflect the wear condition of the material to some extent, the wear coefficient is not a constant value but is affected by temperature, oxidation degree, mechanical load and other factors. Therefore, a single Archard coefficient cannot accurately predict the wear behavior of TA15 alloy in a high-temperature environment. SUMMARY

[0004] In order to overcome the above-mentioned problems existing in the prior art, the application provides a method, system, medium and equipment for determining a life evaluation model of TA15 alloy fretting wear, which is used to solve the above-mentioned problems existing in the prior art.

[0005] A method for determining a life evaluation model of TA15 alloy fretting wear, the method comprising:

[0006] S1. Based on the experimental data, the existing oxidation wear model is modified to obtain an oxidation wear model at low temperature, i.e. a fretting wear life evaluation model of TA15 alloy at low temperature;

[0007] S2. The oxidation activation energy, dissipation energy and sliding amplitude parameters are introduced to modify the oxidation wear model at low temperature again to obtain an oxidation wear model at medium and high temperatures, i.e. a fretting wear life evaluation model of TA15 alloy at medium and high temperatures;

[0008] S3. Under high temperature conditions, the oxidation spalling coefficient is introduced to modify the oxidation wear model at medium and high temperatures again to obtain an oxidation wear model at high temperature, i.e. a fretting wear life evaluation model of TA15 alloy at high temperature.

[0009] According to the aspect and any possible implementation ways as above, further provided is an implementation way, wherein the low temperature is greater than or equal to 298 K and less than 673 K, the medium-high temperature is greater than or equal to 673 K and less than 1273 K, and the high temperature is greater than or equal to 1273 K.

[0010] According to the aspect and any possible implementation ways as above, further provided is an implementation way, wherein the low temperature is 298 K or 473 K, the medium-high temperature is 673 K, 873 K or 1073 K, and the high temperature is 1273 K.

[0011] According to the aspect and any possible implementation ways as above, further provided is an implementation way, wherein S1 comprises: performing a fretting wear experiment on the TA15 alloy plate at the low temperature, the medium-high temperature and the high temperature to obtain a dissipated energy E d , a sliding amplitude δ0, a maximum tangential force Q * , a friction force Q, and a relationship curve between the friction force Q and a friction displacement δ.

[0012] According to the aspect and any possible implementation ways as above, further provided is an implementation way, wherein S1 further comprises: S11. establishing an oxidation wear model according to a pre-exponential factor A2 related to the material and the experimental conditions, an activation energy E a of the oxidation process, a universal gas constant R, an absolute temperature T and a test time t, and the expression is as follows:

[0013] S12. the expression of the pre-exponential factor A2 is as follows: A2=k3·exp(k4T), wherein k3 and k4 are correction exponents of the material and the experimental conditions;

[0014] S13. substituting the expression of S12 into the oxidation wear model to obtain an oxidation wear model at the low temperature as follows:

[0015]

[0016] According to the aspect and any possible implementation ways as above, further provided is an implementation way, wherein the oxidation wear coefficient K ox , a frequency f, a sliding amplitude δ0, an average energy friction coefficient and a dissipated energy E d are introduced into the oxidation wear model at the low temperature to obtain an oxidation wear model at the medium-high temperature as follows:

[0017] According to the aspect and any possible implementation ways as above, further provided is an implementation way, wherein the average friction coefficient And the corresponding correction coefficient k5 is used to correct the oxidation wear model under medium and high temperature, and the corrected oxidation wear model under medium and high temperature is obtained.

[0018]

[0019] The application further provides a system for determining a life evaluation model of micro-tribological wear of TA15 alloy under different temperatures, which is used for implementing the method and comprises the following steps of:

[0020] The oxidation wear model under low temperature is obtained by correcting the existing oxidation wear model based on the experimental data, and the oxidation wear model under low temperature is the micro-tribological wear life evaluation model of TA15 alloy under low temperature.

[0021] The oxidation wear model under medium and high temperature is obtained by introducing oxidation activation energy, dissipation energy and sliding amplitude parameters to correct the oxidation wear model under low temperature again, and the oxidation wear model under medium and high temperature is the micro-tribological wear life evaluation model of TA15 alloy under medium and high temperature.

[0022] The oxidation wear model under high temperature is obtained by introducing an oxidation spalling coefficient to correct the oxidation wear model under medium and high temperature again under high temperature, and the oxidation wear model under high temperature is the micro-tribological wear life evaluation model of TA15 alloy under high temperature.

[0023] The application further provides a computer storage medium, wherein the medium stores a computer program, and the computer program is executed by a processor to implement the method.

[0024] The application further provides an electronic device, which comprises:

[0025] A memory storing executable instructions;

[0026] A processor, wherein the processor

[0027] The executable instructions in the memory are executed to implement the method.

[0028] Advantages of the application

[0029] Compared with the prior art, the application has the following advantages:

[0030] The application obtains the wear volume data at different temperatures by carrying out fretting wear experiment on TA15 alloy in high-temperature oxidation environment, and modifies the traditional oxidation wear model in combination with oxidation kinetics and tribology theory. An oxidation wear life evaluation model of TA15 alloy at different temperatures is constructed, which is more suitable for evaluating the fretting wear behavior of TA15 alloy in electric arc additive manufacturing at high temperature, thereby providing a scientific basis for fretting wear life evaluation of TA15 alloy. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 A schematic diagram of the relative movement direction of the TA15 alloy plate and the counter ball is shown in the figure.

[0032] Figure 2 A schematic diagram of the high-temperature fretting wear test device is shown in the figure.

[0033] Figure 3 A schematic diagram of the complete slip state fretting cycle decomposition is shown in the figure.

[0034] Figure 4 A schematic diagram of the method flow of the application is shown in the figure. DETAILED DESCRIPTION

[0035] In order to better understand the technical solutions of the application, the summary of the application includes but is not limited to the specific embodiments described below, and similar technologies and methods should be regarded as within the scope of protection of the application. In order to make the technical problems, technical solutions and advantages of the application more clear, the following will be described in detail in combination with the drawings and specific embodiments.

[0036] It should be clear that the embodiments described in the application are only a part of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0037] The terms used in the embodiments of the application are only for the purpose of describing specific embodiments, and are not intended to limit the application. The singular forms "a", "said" and "the" used in the embodiments of the application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0038] The method for determining the fretting wear life evaluation model of TA15 alloy of the application comprises:

[0039] S1. Based on the experimental data, the existing oxidation wear model is modified to obtain the oxidation wear model at low temperature, i.e. the fretting wear life evaluation model of TA15 alloy at low temperature;

[0040] S2. Introducing oxidation activation energy, dissipation energy and sliding amplitude parameters, the oxidation wear model at low temperature is modified again to obtain the oxidation wear model at medium-high temperature, i.e. the fretting wear life evaluation model of TA15 alloy at medium-high temperature;

[0041] S3. Under high temperature conditions, introducing oxidation spalling coefficient, the oxidation wear model at medium-high temperature is modified again to obtain the oxidation wear model at high temperature, i.e. the fretting wear life evaluation model of TA15 alloy at high temperature.

[0042] Wherein, the low temperature is greater than or equal to 298K and less than 673K, the medium-high temperature is greater than or equal to 673K and less than 1273K; the high temperature is greater than or equal to 1273K.

[0043] Further, the low temperature is 298K, 473K, the medium-high temperature is 673K, 873K and 1073K; the high temperature is 1273K.

[0044] The specific process is as follows:

[0045] Firstly, the wear volume, friction coefficient, Q-δ graph and other data are obtained through the fretting wear experiment of TA15 alloy plate at different temperatures (298K, 473K, 673K, 873K, 1073K, 1273K). As shown in the figure, the ball-plate contact mode is used for the fretting wear experiment, the experimental material is TA15 alloy plate, and the counter material is Si3N4 ball. The fretting direction of the plate is shown by the arrow in the figure. The fixation of the plate and the ball in the experimental equipment is shown in the figure. Figure 1 Figure 2 Figure 2 It also includes upper and lower clamps for fixing and clamping the plate and the ball. The upper clamp is provided with a load driving block above, which is used to provide the downward normal force P to the upper clamp. The lower clamp is provided with an amplitude driving block below, which is used to provide the horizontal movement amplitude to the lower clamp, so that the ball and the plate are clamped under the upper and lower clamps, the high temperature furnace provides the required temperature for the experiment, under the application of the normal force P and the vibration amplitude along the horizontal movement direction, the relative movement between the ball and the plate is generated, and the amplitude driving is used to generate the relative movement. The following parameters are obtained during the experiment: dissipation energy E d , sliding amplitude δ0, maximum tangential force Q * , friction force Q and displacement δ. The Q-δ relationship curve obtained according to the friction force Q and the displacement δ is shown in the figure. The fretting slip state can be judged according to the shape of the Q-δ curve. Figure 3

[0046] ​​​In the second step, in the partial slip zone (the Q-δ curve is approximately a closed curve), the temperature is 298 K and 473 K. Based on Archard's law, as shown in Equation (1), the Arrhenius equation is introduced to describe the oxidative wear model, as shown in Equation (2). Assuming that the wear volume is affected by temperature and the oxidative wear process can be regarded as a temperature-dependent reaction process, the model can be written as Equation (3).

[0047]

[0048]

[0049]

[0050] In the above formulas (1)-(3), V is the theoretical wear volume, μm 3 , V' is the wear volume; k1 is the wear coefficient; P is the normal force, N; L is the sliding distance, μm; H is the hardness of the material; k2 is the reaction rate constant; A1 is the pre-exponential factor related to the frequency of the reaction; A2 is the pre-exponential factor related to the material and experimental conditions (can be obtained by experimental fitting), μm 3 / s;E a is the activation energy of the oxidation process, J / mol, Figure 2 The device shown in the figure is used for testing to obtain the following: R is the universal gas constant, R=8.314 J / K / mol; T is the absolute temperature, K; t is the test time (t is 1800s in the present invention), s.

[0051] In the third step, the expression corresponding to the pre-exponential factor A2 can be fitted according to the absolute temperature T in the experimental data, as shown in formula (4), where A2 is an exponential function with respect to the absolute temperature T, and k3 and k4 are correction exponents of the material and experimental conditions, respectively.

[0052] A2=k3·exp(k4T) (4)

[0053] Substituting Equation (4) into Equation (3), we can obtain the partial slip state (not involving dissipated energy E) d , oxidation of the sliding amplitude δ0)

[0054] The fourth step is that in the mixed zone and the complete slip zone (the Q-δ curve is close to an ellipse and a parallelogram), the temperature is 673K~1273K, the increase of oxidation rate and wear rate is not proportional, the formation and peeling of the oxide layer undergo complex dynamic changes, and the model shown in formula (5) needs to be modified. At this time, the relevant dissipated energy is introduced to modify the oxidation wear model. The dissipated energy can be calculated according to Figure 3 The Q-δ curve under the complete slip state is decomposed to obtain the dissipated energy E in one cycle.d approximately equal to Figure 3 The area of the mid-gray region is shown in equation (6).

[0055]

[0056]

[0057] where K ox is the oxidation wear coefficient, μm 2 ·s 0.5 is a known quantity; the frequency f, Hz, is a known quantity; the sliding amplitude δ0, μm, is a known quantity; the average energy friction coefficient E d is the dissipated energy, so that the oxidation wear model related to the Q-δ curve can be obtained, n is the number of fretting cycles, and is a known quantity.

[0058] Equation (6) ignores the influence of the friction coefficient μ on the predicted wear volume, and it is necessary to consider its influence on the results when the friction coefficient is greater than 0.3. As shown in equation (8), the average friction coefficient and the corresponding correction coefficient k5 are introduced to make corrections, and in combination with equation (7), the oxidation wear model after correction of equation (6) is shown in equation (9), which is the oxidation wear model at medium and high temperatures.

[0059]

[0060]

[0061] In the fifth step, at 1273 K, the material softens, and the oxidation layer on the wear surface peels off seriously, so it is necessary to correct the prediction model shown in equation (9). Considering that the formation and peeling of the oxidation layer are jointly controlled by the oxidation reaction rate, the growth of the oxidation layer, the action of mechanical stress, and the re-oxidation process, in order to simplify this complex process and effectively predict the fatigue life under high temperature conditions, the peeling coefficient D (μm 2 / s) is introduced to replace the oxidation wear coefficient K ox in equation (9), so as to correct the oxidation wear model. The peeling coefficient D comprehensively considers the above factors and can reflect the dynamic balance between the growth and peeling of the oxidation layer in the model. The expression of the peeling coefficient D is shown in equation (10), in which k6 is the correction index of the peeling coefficient.

[0062]

[0063] Considering that the friction coefficient μ drifts at high temperatures, the average friction coefficient The correction index k7 is introduced to correct the potential influence of the change of the adjusted friction coefficient again to ensure the accuracy of the prediction result. The prediction model at 1273K is shown in equation (11), that is, the oxidation wear model at high temperature.

[0064]

[0065] The micro-tribological wear fatigue life prediction model of the TA15 alloy plate under different temperature environments from the partial slip state to the full slip state is shown in equation (9).

[0066] 673K>T≥298K:

[0067] 1273K>T≥673K:

[0068] T≥1273K:

[0069] In the seventh step, the micro-tribological wear test of the TA15 alloy plate at different temperatures is carried out, the expression of the pre-exponential factor A and the spalling coefficient D and the oxidation process activation energy E a are obtained by linear fitting, and the goodness of fit is greater than or equal to 0.9. Since the test is carried out in a specific mechanical parameter range, preferably, the life evaluation model of the micro-tribological wear of the TA15 alloy plate of the present application uses the following parameters: the absolute temperature T is 298-1273K, the displacement 6 is 150μm, the contact force P is 10N, and the frequency f is 10Hz.

[0070] As an embodiment disclosed by the present application, the present application further provides a system for determining the life evaluation model of the micro-tribological wear of the TA15 alloy at different temperatures, which is used to implement the method and comprises:

[0071] The oxidation wear model acquisition module at low temperature is used to correct the known oxidation wear model based on the experimental data to obtain the oxidation wear model at low temperature, that is, the micro-tribological wear life evaluation model of the TA15 alloy at low temperature;

[0072] The oxidation wear model acquisition module at medium and high temperatures is used to introduce the oxidation activation energy, the dissipation energy and the sliding amplitude parameter to correct the oxidation wear model at low temperature again to obtain the oxidation wear model at medium and high temperatures, that is, the micro-tribological wear life evaluation model of the TA15 alloy at medium and high temperatures;

[0073] The oxidation wear model acquisition module is used for introducing an oxidation spalling coefficient under high temperature conditions, performing secondary correction on the oxidation wear model under medium and high temperatures, and obtaining the oxidation wear model under high temperature, that is, the fretting wear life evaluation model of TA15 alloy under high temperature.

[0074] As an embodiment disclosed by the application, the application further provides a computer storage medium, which stores a computer program, and the computer program is executed by a processor to realize the method.

[0075] As an embodiment disclosed by the application, the application further provides an electronic device, which comprises:

[0076] a memory storing executable instructions;

[0077] a processor running the executable instructions in the memory to realize the method.

[0078] The above description shows and describes several preferred embodiments of the application, but as mentioned above, it should be understood that the application is not limited to the forms disclosed herein, should not be regarded as excluding other embodiments, and can be used in various other combinations, modifications and environments, and can be modified within the scope of the application conceived in the application, by the above-mentioned teaching or related technical or knowledge. The modification and change made by the person skilled in the art without departing from the spirit and scope of the application shall be within the protection scope of the claims attached to the application.

Claims

1. A method for determining a life assessment model for fretting wear of TA15 alloy, characterized in that: The method comprises: S1. Based on the experimental data, the existing oxidation wear model is modified to obtain the low temperature oxidation wear model, that is, the low temperature TA15 alloy fretting wear life evaluation model, including: fretting wear experiments on TA15 alloy plates at low temperature, medium and high temperature, and high temperature to obtain the dissipated energy E d , sliding amplitude δ0, maximum tangential force Q *、 The relationship curve between friction force Q and friction displacement δ is: S11. Based on the pre-exponential factor A2 related to materials and experimental conditions, the activation energy E of the oxidation process a The oxidation wear model is established using the universal gas constant R, absolute temperature T, and test time t. The expression is as follows: ; S12. The expression of the pre-exponential factor A2 is: , k3 and k4 are the correction indices of materials and experimental conditions, respectively; S13. Substituting the expression of S12 into the oxidation wear model, the oxidation wear model at low temperature is obtained as follows: ； S2. Introducing oxidation activation energy, dissipated energy, and sliding amplitude parameters, the oxidation wear model at low temperature is further modified to obtain the oxidation wear model at medium and high temperatures, that is, the fretting wear life evaluation model of TA15 alloy at medium and high temperatures. Specifically, the oxidation wear coefficient K is ox , frequency f, sliding amplitude δ0, average energy friction coefficient and dissipated energy E d Introducing the oxidation wear model at low temperature, the oxidation wear model at medium and high temperature is obtained as follows: ; Using the average friction coefficient The oxidation wear model at medium and high temperatures is corrected by using the corresponding correction coefficient k5, and the corrected oxidation wear model at medium and high temperatures is obtained as follows: , n is the number of micro-motion cycles; S3. Under high temperature conditions, the oxidation wear model at medium and high temperatures was modified by introducing the oxidation spalling coefficient. This resulted in a high temperature oxidation wear model, i.e., a fretting wear life assessment model for TA15 alloy at high temperatures. Specifically, the spalling coefficient D was used to replace the oxidation wear coefficient K in the modified oxidation wear model at medium and high temperatures. ox , thus correcting the modified oxidation wear model at medium and high temperatures, the expression of the spalling coefficient D is: , k6 is the correction index of the spalling coefficient, and the correction index k7 is used to further correct the potential impact of the change in the friction coefficient μ at high temperature, and the oxidation wear model at high temperature is obtained as follows: ; The low temperature is greater than or equal to 298K and less than 673K, the medium and high temperature is greater than or equal to 673K ​​and less than 1273K; the high temperature is greater than or equal to 1273K.

2. The method according to claim 1, characterized in that The low temperatures are 298 K and 473 K, the medium and high temperatures are 673 K, 873 K and 1073 K; and the high temperature is 1273 K.

3. A system for determining a life assessment model for fretting wear of TA15 alloy at different temperatures, characterized in that: The system is used to implement the method according to any one of claims 1 to 2, comprising: A low-temperature oxidation wear model acquisition module is used to modify the existing oxidation wear model based on experimental data to obtain a low-temperature oxidation wear model, namely, a low-temperature fretting wear life assessment model for TA15 alloy; The module for acquiring the oxidation wear model at medium and high temperatures is used to introduce oxidation activation energy, dissipated energy, and sliding amplitude parameters, and further modify the oxidation wear model at low temperatures to obtain the oxidation wear model at medium and high temperatures, that is, the fretting wear life assessment model for TA15 alloy at medium and high temperatures; The high-temperature oxidation wear model acquisition module is used to introduce the oxidation spalling coefficient under high-temperature conditions and perform secondary correction on the oxidation wear model at medium and high temperatures to obtain the high-temperature oxidation wear model, that is, the fretting wear life evaluation model of TA15 alloy at high temperatures.

4. A computer storage medium, characterized in that The medium stores a computer program, which is executed by a processor to implement the method according to any one of claims 1 to 2.

5. An electronic device, characterized in that: The electronic device comprises: a memory storing executable instructions; processor, the processor The executable instructions in the memory are executed to implement the method according to any one of claims 1 to 2.

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