Method, system, medium and equipment for determining TA15 alloy fretting wear life evaluation model

Abstract

The invention relates to a method, system, medium and equipment for determining a TA15 alloy fretting wear life evaluation model, and the method comprises the steps: correcting an existing oxidative wear model based on data measured by an experiment, and obtaining an oxidative wear model at a low temperature; introducing oxidation activation energy, dissipation energy and a sliding amplitude parameter, and correcting the oxidative wear model at the low temperature again to obtain an oxidative wear model at medium and high temperatures; and under the high-temperature condition, an oxidation stripping coefficient is introduced, secondary correction is conducted on the oxidation wear model at the medium-high temperature, and the oxidation wear model at the high temperature is obtained, namely, the fretting wear life evaluation model of the TA15 alloy at the high temperature is obtained. According to the model, the influence of temperature on heat transfer tube abrasion is considered, the Archard model and the oxidative abrasion model are corrected, a key correction coefficient is obtained through fitting in a linear regression mode, and the abrasion life of the TA15 alloy plate manufactured through electric arc additive manufacturing can be accurately predicted.

Description

Technical Field

[0001] The present invention belongs to the technical field of fretting wear of TA15 titanium alloy manufactured by arc additive manufacturing, and specifically relates to a method, system, medium and equipment for determining a life assessment model of fretting wear of TA15 alloy. Background Art

[0002] TA15 alloy (Ti-6.5Al-2Zr-1Mo-1V) is a typical structural material used in the aerospace field. As a near-α-type 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, due to changes in temperature and pressure, micro-wear will occur between the TA15 alloy and other components, which will continuously destroy the oxide layer on the surface of the alloy and lead to material failure. Therefore, constructing a life assessment model for TA15 alloy plates and accurately predicting the wear life of the plates can avoid regular inspections and save a lot of manpower and material resources.

[0003] At present, the research on the oxidation wear behavior of TA15 alloy is mainly focused on laboratory conditions, and the wear mechanism is analyzed by measuring the wear volume at different temperatures. Combined with the Archard model, although it can reflect the wear of the material to a certain extent, its wear coefficient is not a constant value, but is affected by multiple factors such as temperature, oxidation degree, and mechanical load. Therefore, a single Archard coefficient cannot accurately predict the wear behavior of TA15 alloy in a high temperature environment. Summary of the invention

[0004] In order to overcome the above problems existing in the prior art, the present invention provides a method, system, medium and equipment for determining a life assessment model of fretting wear of TA15 alloy, which are used to solve the above problems existing in the prior art.

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

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

[0007] S2. The oxidation activation energy, dissipated energy and sliding amplitude parameters are introduced to modify the oxidation wear model at low temperature again, and the oxidation wear model at medium and high temperature is obtained, that is, the fretting wear life evaluation model of TA15 alloy at medium and high temperature;

[0008] S3. Under high temperature conditions, the oxidation spalling coefficient is introduced to make a secondary correction to the oxidation wear model at medium and high temperatures, and the oxidation wear model at high temperature is obtained, that is, the micro-motion wear life evaluation model of TA15 alloy at high temperature.

[0009] According to the aspects described above and any possible implementation, an implementation is further provided, 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; and the high temperature is greater than or equal to 1273K.

[0010] According to the aspects and any possible implementations described above, an implementation is further provided, wherein the low temperature is 298K and 473K, the medium and high temperatures are 673K, 873K and 1073K; and the high temperature is 1273K.

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

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

[0013] S12. The expression of the pre-exponential factor A2 is: A2 = k3·exp(k4T), where k3 and k4 are correction exponents of materials and experimental conditions, respectively;

[0014] S13. Substitute the expression of S12 into the oxidation wear model, and the oxidation wear model at low temperature is obtained as follows:

[0015]

[0016] According to the above aspects and any possible implementation, a further implementation is provided, wherein the oxidation wear coefficient K 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:

[0017] According to the above aspects and any possible implementation, a further implementation is provided, using an average friction coefficient And the corresponding correction coefficient k5 is used to correct the oxidation wear model at medium and high temperatures, and the corrected oxidation wear model at medium and high temperatures is obtained as follows:

[0018]

[0019] The present invention also provides a system for determining a life assessment model of TA15 alloy fretting wear at different temperatures, the system being used to implement the method, comprising:

[0020] The low temperature oxidation wear model acquisition module is used to modify the existing oxidation wear model based on experimental data to obtain the low temperature oxidation wear model, that is, the low temperature fretting wear life evaluation model of TA15 alloy;

[0021] The oxidation wear model acquisition module at medium and high temperatures is used to introduce oxidation activation energy, dissipated energy and sliding amplitude parameters, and to correct the oxidation wear model at low temperatures again to obtain the oxidation wear model at medium and high temperatures, that is, the fretting wear life assessment model of TA15 alloy at medium and high temperatures;

[0022] The high-temperature oxidation wear model acquisition module is used to introduce the oxidation spalling coefficient under high-temperature conditions, perform secondary correction on the oxidation wear model at medium and high temperatures, and obtain the high-temperature oxidation wear model, that is, the micro-motion wear life evaluation model of TA15 alloy at high temperature.

[0023] The present invention also provides a computer storage medium, on which a computer program is stored, and the computer program is executed by a processor to implement the method described.

[0024] The present invention further provides an electronic device, comprising:

[0025] A memory storing executable instructions;

[0026] processor, the processor

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

[0028] Beneficial Effects of the Invention

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention conducts fretting wear experiments on TA15 alloy in a high-temperature oxidation environment, obtains wear volume data at different temperatures, and modifies the traditional oxidation wear model by combining oxidation kinetics and tribology theory. A model that can accurately predict the oxidation wear life evaluation of TA15 alloy at different temperatures is constructed, making it more suitable for evaluating the fretting wear behavior of TA15 alloy manufactured by arc additive at high temperatures, thereby providing a scientific basis for the fretting wear life evaluation of TA15 alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the relative movement direction of the TA15 alloy plate and the grinding ball;

[0032] Figure 2 This is a schematic diagram of the high temperature fretting wear test device;

[0033] Figure 3 This is a schematic diagram of the decomposition of the micro-motion cycle in the complete slip state;

[0034] Figure 4 It is a schematic diagram of the method flow of the present invention. DETAILED DESCRIPTION

[0035] In order to better understand the technical solution of the present invention, the content of the present invention includes but is not limited to the specific implementation methods described below, and similar technologies and methods should be considered to be within the scope of protection of the present invention. In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

[0036] It should be clear that the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

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

[0038] The method for determining the life assessment model of TA15 alloy fretting wear of the present invention comprises:

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

[0040] S2. The oxidation activation energy, dissipated energy and sliding amplitude parameters are introduced to modify the oxidation wear model at low temperature again, and the oxidation wear model at medium and high temperature is obtained, that is, the fretting wear life evaluation model of TA15 alloy at medium and high temperature;

[0041] S3. Under high temperature conditions, the oxidation spalling coefficient is introduced to make a secondary correction to the oxidation wear model at medium and high temperatures, and the oxidation wear model at high temperature is obtained, that is, the micro-motion wear life evaluation model of TA15 alloy at high temperature.

[0042] Among them, 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.

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

[0044] The specific process is as follows:

[0045] In the first step, the wear volume, friction coefficient, Q-δ diagram and other data were obtained through the fretting wear test of TA15 alloy plates at different temperatures (298K, 473K, 673K, 873K, 1073K, 1273K). Figure 1 As shown in the figure, the micro-motion wear experiment was carried out using the ball-plate contact method. The experimental material was TA15 alloy plate and the grinding material was Si3N4 ball. The micro-motion direction of the plate is shown by the arrow in the figure. The plate and the grinding ball are fixed in the experimental equipment as shown in the figure. Figure 2 As shown, Figure 2 It also includes upper and lower clamps for fixing and clamping the plate and the grinding ball. A load driving block is arranged above the upper clamp to provide a downward normal force P to the upper clamp, and an amplitude driving block is arranged below the lower clamp to provide the lower clamp with an amplitude for horizontal movement, so that the ball and the plate are clamped by the upper and lower clamps, and the high-temperature furnace provides the temperature required for the experiment. Under the application of the normal force P and the vibration amplitude along the horizontal movement direction, the ball and the plate produce relative motion, and the amplitude drive can produce relative motion. The following parameters are obtained during the experiment: dissipated energy E d , sliding amplitude δ0, maximum tangential force Q * , friction force Q and displacement δ, the Q-δ relationship curve obtained based on the friction force Q and displacement δ is as follows Figure 3 The micro-slip state can be determined based on the shape of the Q-δ curve.

[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 formula (1), the Arrhenius equation is introduced to describe the oxidation wear model, as shown in formula (2). It is assumed that the wear volume is affected by temperature, and the oxidation wear process can be regarded as a temperature-dependent reaction process. The model can be written as formula (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 the experiment, and the results are as follows: 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 of the absolute temperature T, and k3 and k4 are correction exponents of materials 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 , the 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 equation (5) needs to be corrected. At this time, the relevant dissipated energy is introduced to correct 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 middle gray region is shown in formula (6).

[0055]

[0056]

[0057] In the formula, K ox is the oxidation wear coefficient, μm 2 ·s 0.5 / J, is a known quantity; frequency f, Hz, is a known quantity; sliding amplitude δ0, μm, is a known quantity; 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, and n is the number of micro-motion cycles, which is a known quantity.

[0058] Formula (6) ignores the effect of the friction coefficient μ on the predicted wear volume. It is necessary to consider its effect on the result when the friction coefficient is greater than 0.3. As shown in formula (8), the average friction coefficient is introduced And the corresponding correction coefficient k5 is used for correction, and combined with formula (7), the oxidation wear model after correction of formula (6) is shown in formula (9). Formula (9) is the oxidation wear model under medium and high temperature.

[0059]

[0060]

[0061] In the fifth step, at 1273K, the material softens and the oxide layer on the worn surface peels off severely, so the prediction model shown in formula (9) needs to be modified. Considering that the formation and peeling of the oxide layer are controlled by the oxidation reaction rate, the growth of the oxide layer, the effect of mechanical stress and the reoxidation 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) to replace the oxidation wear coefficient K in formula (9) ox , thereby correcting the oxidation wear model. The spalling coefficient D combines the above factors and can reflect the dynamic balance between oxide layer growth and spalling in the model. The expression of the spalling coefficient D is shown in formula (10), where k6 is the correction index of the spalling coefficient.

[0062]

[0063] Considering the drift of the friction coefficient μ at high temperature, the average friction coefficient To ensure the accuracy of the prediction results, the correction index k7 is introduced to correct the potential impact of the change in friction coefficient. The prediction model at 1273K is shown in formula (11), which is the oxidation wear model at high temperature.

[0064]

[0065] Step 6. In summary, the fretting wear fatigue life prediction model of TA15 alloy plate from partial slip state to full slip state under different temperature environments is shown in formula (9).

[0066] When 673K>T≥298K:

[0067] When 1273K>T≥673K:

[0068] When T≥1273K:

[0069] In the seventh step, through the fretting wear test of TA15 alloy plate at different temperatures, the linear fitting method is used to obtain the expression of the pre-exponential factor A, the spalling coefficient D and the activation energy E of the oxidation process. a The value of is set, and the goodness of fit is ensured to be greater than or equal to 0.9. Since the test is carried out within a specific range of mechanical parameters, preferably, the life assessment model of the TA15 alloy plate fretting wear of the present invention uses the following parameters: absolute temperature T is 298-1273K, displacement 6 is 150μm, contact force P is 10N, and frequency f is 10Hz.

[0070] As an embodiment disclosed in the present invention, the present invention also provides a system for determining a life assessment model of fretting wear of TA15 alloy at different temperatures, wherein the system is used to implement the method described, including:

[0071] The low temperature oxidation wear model acquisition module is used to modify the existing oxidation wear model based on experimental data to obtain the low temperature oxidation wear model, that is, the low temperature fretting wear life evaluation model of TA15 alloy;

[0072] The oxidation wear model acquisition module at medium and high temperatures is used to introduce oxidation activation energy, dissipated energy and sliding amplitude parameters, and to correct the oxidation wear model at low temperatures again to obtain the oxidation wear model at medium and high temperatures, that is, the fretting wear life assessment model of TA15 alloy at medium and high temperatures;

[0073] The high-temperature oxidation wear model acquisition module is used to introduce the oxidation spalling coefficient under high-temperature conditions, perform secondary correction on the oxidation wear model at medium and high temperatures, and obtain the high-temperature oxidation wear model, that is, the micro-motion wear life evaluation model of TA15 alloy at high temperature.

[0074] As an embodiment disclosed in the present invention, the present invention further provides a computer storage medium, on which a computer program is stored, and the computer program is executed by a processor to implement the method described.

[0075] As an embodiment disclosed in the present invention, the present invention further provides an electronic device, the electronic device comprising:

[0076] A memory storing executable instructions;

[0077] A processor is used to execute the executable instructions in the memory to implement the method.

[0078] The above description shows and describes several preferred embodiments of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the application concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not depart from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A method for determining a life assessment model for fretting wear of a TA15 alloy, characterized in that: The method comprises: S1. Based on the experimental data, the existing oxidation wear model is modified to obtain the oxidation wear model at low temperature, that is, the fretting wear life evaluation model of TA15 alloy at low temperature; S2. The oxidation activation energy, dissipated energy and sliding amplitude parameters are introduced to modify the oxidation wear model at low temperature again, and the oxidation wear model at medium and high temperature is obtained, that is, the fretting wear life evaluation model of TA15 alloy at medium and high temperature; S3. Under high temperature conditions, the oxidation spalling coefficient is introduced to make a secondary correction to the oxidation wear model at medium and high temperatures, and the oxidation wear model at high temperature is obtained, that is, the micro-motion wear life evaluation model of TA15 alloy at high temperature.

2. The method according to claim 1, characterized in that 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.

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

4. The method according to claim 3, characterized in that S1 includes: Fretting wear experiments were carried out on TA15 alloy plates at low temperature, medium-high temperature and high temperature, and the dissipated energy E d , sliding amplitude δ0, maximum tangential force Q * , friction force Q, and the relationship curve between friction force Q and friction displacement δ.

5. The method according to claim 3, characterized in that: The S1 also includes: S11. According to the pre-exponential factor A2 related to the material and experimental conditions, the activation energy E of the oxidation process a The oxidation wear model is established based on 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: A2 = k3·exp(k4T), where k3 and k4 are correction exponents of materials and experimental conditions, respectively; S13. Substitute the expression of S12 into the oxidation wear model, and the oxidation wear model at low temperature is obtained as follows:

6. The method according to claim 5, characterized in that The oxidation wear coefficient K 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:

7. The method according to claim 6, characterized in that Using the average friction coefficient And the corresponding correction coefficient k5 is used to correct the oxidation wear model at medium and high temperatures, and the corrected oxidation wear model at medium and high temperatures is obtained as follows:

8. 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 7, comprising: The low temperature oxidation wear model acquisition module is used to modify the existing oxidation wear model based on experimental data to obtain the low temperature oxidation wear model, that is, the low temperature fretting wear life evaluation model of TA15 alloy; The oxidation wear model acquisition module at medium and high temperatures is used to introduce oxidation activation energy, dissipated energy and sliding amplitude parameters, and to correct the oxidation wear model at low temperatures again to obtain the oxidation wear model at medium and high temperatures, that is, the fretting wear life assessment model of 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, perform secondary correction on the oxidation wear model at medium and high temperatures, and obtain the high-temperature oxidation wear model, that is, the micro-motion wear life evaluation model of TA15 alloy at high temperature.

9. A computer storage medium, characterized in that The medium stores a computer program, and the computer program is executed by a processor to implement the method according to any one of claims 1 to 7.

10. 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 7.

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