High-temperature corrosion and thermal fatigue composite testing device and method
By designing a high-temperature corrosion and thermal fatigue composite testing device, using brine solution to evaporate the precipitated salt particles for corrosion testing, and monitoring the force signal of the sample through force sensors, the problem of difficult to verify the high-temperature corrosion and thermal fatigue failure mode of metal materials in the existing technology is solved, and the comprehensive testing of metal materials in high-temperature environments is achieved, with flexible working conditions, wide application range and low test cost.
Patent Information
- Application Number
- CN202411794042.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-02-25
AI Technical Summary
The prior art is difficult to effectively verify the corrosion and thermal fatigue failure mode of metal materials in high temperature environments, and the existing salt spray testing equipment cannot fully simulate the actual working conditions.
A high-temperature corrosion and thermal fatigue composite testing device is designed, and the salt solution is evaporated in the concave part of the sample, and the salt particles are precipitated for corrosion testing. The force signal of the sample is monitored in real time through the force sensor, and the controller determines the test process based on the signal.
It realizes comprehensive testing of corrosion and thermal fatigue of metal materials in high temperature environments, flexible working conditions, wide application scope, low test cost, and more appropriate simulation of the actual working environment.
Smart Images
Figure CN119510281A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of component testing, and in particular relates to a high-temperature corrosion and thermal fatigue composite testing device and method. Background Art
[0002] The automotive exhaust system is subjected to high-temperature gases discharged from the engine, and its structural thermal fatigue is a key performance that the industry focuses on. On the other hand, in many high-temperature application fields, metal materials are prone to corrosion failure, especially in coastal areas where there are a variety of mineral salts in the water environment. The overlap of thermal fatigue of metal materials and high-temperature corrosion effects often further aggravates the process of product failure and loss.
[0003] At present, the devices used in the market for testing the corrosion performance of metal materials mainly include salt spray test equipment, which does not fully meet the actual high-temperature environment. There are no reports on the application of verification methods for the two failure modes of high-temperature corrosion and thermal fatigue in this technical field.
[0004] Therefore, in view of some shortcomings of the existing salt spray test and fatigue test, combined with the actual working environment, a high-temperature corrosion and thermal fatigue composite test method is studied and developed. This method needs to have technical advantages such as being suitable for the actual environment, flexible working condition settings, and low test cost. Summary of the invention
[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a high-temperature corrosion and thermal fatigue composite test device and method. In the high-temperature holding stage, the salt water solution evaporates in the concave part of the sample, and salt particles are precipitated on the surface of the sample. Under high temperature conditions, the salt particles have a strong corrosive effect on the surface of the metal material sample, and during the high-temperature corrosion of the sample, the force sensor is used to monitor the force signal of the sample in real time. By recording the maximum force of each cycle cooling process and transmitting the signal to the controller, the controller can determine the test progress according to the force value. The whole process takes into account the multiple influencing factors of high temperature, corrosion, and thermal fatigue at the same time, which is more in line with the actual working environment of the sample.
[0006] In order to achieve the above technical objectives, the technical solution adopted by the embodiment of the present invention is: In a first aspect, an embodiment of the present invention provides a high temperature corrosion and thermal fatigue composite testing device, comprising a base plate, on which a column, a first support block, a second support block, a baffle and a liquid accumulation box are arranged; The first support block cooperates with the first pressing block to fix one end of the sample, the other end of the sample is limited by the second pressing block, the second pressing block is connected to the force sensor through the ceramic block, and the force sensor is arranged on the baffle; The sample has a concave portion in the middle, the liquid collection box is located directly below the concave portion, a container is provided above the concave portion, a saline solution is contained in the container, and the composition of the saline solution is prepared according to the requirements of the corrosive environment; A flow guide tube is provided at the bottom of the container, and an adjusting knob for adjusting the flow rate of the saline solution is provided on the flow guide tube; The first pressing block is connected to a first electric wire, the second pressing block is connected to a second electric wire, and the first electric wire, the first pressing block, the sample, the second pressing block, the second electric wire and a power source are connected to form an energized heating circuit to achieve heating treatment of the sample.
[0007] Furthermore, the end of the sample is inserted into the second pressing block, and when the sample expands due to heat, a force is generated on the second pressing block. The force sensor is used to measure in real time the force generated by the sample on the second pressing block when the sample expands due to heat.
[0008] Furthermore, it also includes a temperature sensor and a controller, wherein the temperature sensor is used to monitor the temperature of the sample in real time and transmit the temperature signal to the controller, and the controller is electrically connected to the power supply to control the heating power of the power supply according to the temperature signal of the temperature sensor.
[0009] Furthermore, the force sensor is electrically connected to the controller, the force sensor transmits the detected force signal to the controller, and the controller determines the test progress according to the force value.
[0010] Furthermore, the container is fixed on a crossbeam, and the crossbeam is connected to the bottom plate via a column.
[0011] Furthermore, a roller is provided at the bottom of the second pressing block, and the second pressing block is placed on the second supporting block.
[0012] Furthermore, the sample is made of metal material, and the first pressing block and the second pressing block are both made of conductive material.
[0013] In a second aspect, an embodiment of the present invention provides a high temperature corrosion and thermal fatigue composite testing method, which is performed in the testing device described in the first aspect, and includes the following steps: Stage 1: Time t0~t1 is the heating stage; The heating signal takes effect, and the first pressing block, the first wire, the sample, the second pressing block, the second wire and the power supply form an electric circuit, and the sample is heated from room temperature T0 to T1. The temperature sensor monitors the temperature of the sample in real time and transmits the signal to the controller. At this time, the adjustment knob is in the closed state; Stage 2: Time t1~t2, which is the high temperature maintenance stage; The heating signal takes effect, the sample is powered on and continues to be heated, and the temperature sensor measures the temperature of the sample in real time to ensure that the temperature of the sample is stable at T1. At this time, the adjustment knob is in the closed state; Stage 3: Time t2~t3 is the cooling trickle stage; The heating signal fails, the sample is in the process of cooling down and maintained at T2, and the temperature sensor monitors the temperature of the sample in real time; at this time, the adjustment knob is in the open state, and the saline solution in the guide tube begins to drip downward to the concave part of the sample, and the downward flow speed can be changed by the adjustment knob, thereby changing the corrosion environment; The above t0~t3 is a working condition cycle, and the working condition is then repeated until the test is stopped. In the subsequent cycle conditions, the temperature of the sample is heated from T2 to T1 when it is powered on in the heating stage; Under the cyclic working condition, the force sensor monitors the force signal of the sample in real time and records the maximum force of each cyclic cooling process; when the maximum force of the cooling process in a certain cycle is reduced to 50% of the initial cycle, the sample is judged to have failed and the test is stopped.
[0014] Further, temperature T1>T2>T0, wherein T0 is room temperature.
[0015] The technical solution provided by the embodiment of the present invention has the following beneficial effects: (1) In the present invention, during the high temperature holding stage, the salt water solution evaporates in the concave part of the sample, and salt particles are precipitated on the surface of the sample. Under high temperature conditions, the salt particles have a strong corrosive effect on the surface of the metal material sample. In the process of high temperature corrosion of the sample, the force signal of the sample is monitored in real time by using a force sensor. By recording the maximum force of each cooling cycle and transmitting the signal to the controller, the controller can determine the test progress according to the force value. The whole process takes into account multiple influencing factors such as high temperature, corrosion, and thermal fatigue, and is more in line with the actual working environment of the sample.
[0016] (2) The present invention has flexible working condition settings during high-temperature corrosion and thermal fatigue composite testing, can cover test samples of different thicknesses, and has a wide range of applications.
[0017] (3) The high-temperature corrosion and thermal fatigue composite test of the present invention has low cost, adopts electric current heating method, has high thermal efficiency, and the size of the sample can be flexible and changeable. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a schematic diagram of the structure of the high temperature corrosion and thermal fatigue composite testing device in Example 1 of the present invention.
[0019] Figure 2Schematic diagram of the test condition cycle of the high temperature corrosion and thermal fatigue composite test method in Example 2 of the present invention.
[0020] Explanation of the reference numerals: 1-base plate; 2-first support block; 3-first pressure block; 4-first electric wire; 5-sample; 6-column; 7-crossbeam; 8-container; 9-saline solution; 10-flow guide tube; 11-adjusting knob; 12-second electric wire; 13-second pressure block; 14-ceramic block; 15-force sensor; 16-power supply; 17-controller; 18-roller; 19-second support block; 20-temperature sensor; 21-fluid collection box; 22-baffle; 51-recess. DETAILED DESCRIPTION
[0021] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "inside, outside", "up, down", "left, right", etc. are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention.
[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0023] Example 1 like Figure 1 As shown, a high temperature corrosion and thermal fatigue composite testing device includes a base plate 1, on which a column 6, a first support block 2, a second support block 19, a baffle 22 and a liquid accumulation box 21 are arranged, and also includes a temperature sensor 20 and a controller 17. The first support block 2 cooperates with the first pressing block 3 to fix one end of the sample 5, and the other end of the sample 5 is limited by the second pressing block 13. The second pressing block 13 is connected to the force sensor 15 through the ceramic block 14, and the force sensor 15 is arranged on the baffle 22; The middle part of the sample 5 has a concave portion 51, the liquid collection box 21 is located directly below the concave portion 51, and a container 8 is provided above the concave portion 51. The container 8 contains a saline solution 9, and the composition of the saline solution 9 is prepared according to the requirements of the corrosive environment. A flow guide tube 10 is provided at the bottom of the container 8, and an adjusting knob 11 for adjusting the flow rate of the saline solution 9 is provided on the flow guide tube 10; The first pressing block 3 is connected to the first wire 4, the second pressing block 13 is connected to the second wire 12, the first wire 4, the first pressing block 3, the sample 5, the second pressing block 13, the second wire 12 and the power supply 16 are connected to form an energized heating circuit to achieve heating treatment of the sample 5; The temperature sensor 20 is used to monitor the temperature of the sample 5 in real time and transmit the temperature signal to the controller 17. The controller 17 is electrically connected to the power supply 16 and controls the heating power of the power supply 16 according to the temperature signal of the temperature sensor 20.
[0024] It is understandable that the sample 5 is made of metal material, and the first pressing block 3 and the second pressing block 13 are both made of conductive material, so that when power is turned on, it can be ensured that a power circuit is formed with the power supply to achieve simulation of high-temperature corrosion of the sample 5.
[0025] The end of the sample 5 is inserted into the second pressing block 13 , and when the sample 5 expands due to heat, a force is applied to the second pressing block 13 .
[0026] The force sensor 15 is electrically connected to the controller 17; The force sensor 15 is used to measure in real time the force exerted on the second pressing block 13 by the sample 5 when it expands due to heat, and transmit the force signal to the controller 17. The controller 17 determines the test progress according to the force value.
[0027] The container 8 is fixed on the cross beam 7 , and the cross beam 7 is connected to the base plate 1 through the column 6 .
[0028] A roller 18 is disposed at the bottom of the second pressing block 13 , and the second pressing block 13 is placed on a second supporting block 19 .
[0029] Example 2 like Figure 2 As shown, a high temperature corrosion and thermal fatigue composite test method is carried out in the test device of Example 1, comprising the following steps: Stage 1: Time t0~t1 is the heating stage; The heating signal takes effect, the first pressing block 3, the first wire 4, the sample 5, the second pressing block 13, the second wire 12 and the power supply 16 form a power-on circuit, the sample 5 is powered on and heated to increase the temperature from room temperature T0 to T1, the temperature sensor 20 monitors the temperature of the sample 5 in real time and transmits the signal to the controller 17, at this time the adjustment knob 11 is in the closed state; Stage 2: Time t1~t2, which is the high temperature maintenance stage; The heating signal takes effect, and the sample 5 continues to be powered on for heating. The temperature sensor 20 measures the temperature of the sample 5 in real time to ensure that the temperature of the sample 5 is stable at T1. At this time, the adjustment knob 11 is in the closed state; Stage 3: Time t2~t3 is the cooling trickle stage; The heating signal fails, the sample 5 is in the process of cooling down and maintained at T2, and the temperature sensor 20 monitors the temperature of the sample 5 in real time; at this time, the adjustment knob 11 is in the open state, and the saline solution 9 in the guide tube 10 begins to drip downward to the lower concave portion 51 of the sample 5. The downstream speed can be changed by adjusting the knob 11, thereby changing the corrosive environment; The above t0~t3 is a working condition cycle, and then the working condition is repeated until the test is stopped. In the subsequent cycle working condition, the temperature of sample 5 rises from T2 to T1 when it is powered on during the heating stage; Under the cyclic working condition, the force sensor 15 monitors the force signal of the sample 5 in real time and records the maximum force of each cyclic cooling process; when the maximum force of the cooling process in a certain cycle is reduced to 50% of the initial cycle, it is judged that the sample has failed and the test is stopped.
[0030] Among them, temperature T1>T2>T0, and T0 is room temperature.
[0031] In the high temperature holding stage of the present invention, the saline solution 9 evaporates in the recessed portion 51 of the sample, and salt particles are precipitated on the surface of the sample 5. Under high temperature conditions, the salt particles have a strong corrosive effect on the surface of the metal material sample 5, and during the high temperature corrosion of the sample 5, the force signal of the sample 5 is monitored in real time by the force sensor 15. Since the sample 5 will gradually corrode under the cyclic working condition, the force detected by the force sensor 15 under each cyclic working condition will gradually decrease. By recording the maximum force of each cyclic cooling process and transmitting the signal to the controller 17, the controller 17 can determine the test progress according to the force value. The whole process takes into account the multiple influencing factors of high temperature, corrosion, and thermal fatigue at the same time, and is more in line with the actual working environment of the sample.
[0032] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.
Claims
1. A high temperature corrosion and thermal fatigue composite testing device, characterized in that: It comprises a bottom plate (1), on which a column (6), a first support block (2), a second support block (19), a baffle (22) and a liquid collection box (21) are arranged; The first support block (2) and the first pressing block (3) cooperate to fix one end of the sample (5), the other end of the sample (5) is limited by the second pressing block (13), the second pressing block (13) is connected to the force sensor (15) via the ceramic block (14), and the force sensor (15) is arranged on the baffle (22); The sample (5) has a concave portion (51) in the middle, the liquid collection box (21) is located directly below the concave portion (51), a container (8) is provided above the concave portion (51), a saline solution (9) is contained in the container (8), and the composition of the saline solution (9) is prepared according to the requirements of the corrosive environment; A flow guide tube (10) is provided at the bottom of the container (8), and an adjusting knob (11) for adjusting the flow rate of the saline solution (9) is provided on the flow guide tube (10); The first pressing block (3) is connected to a first electric wire (4), the second pressing block (13) is connected to a second electric wire (12), and the first electric wire (4), the first pressing block (3), the sample (5), the second pressing block (13), the second electric wire (12) and a power source (16) are connected to form an energized heating circuit to achieve heating treatment of the sample (5).
2. The high temperature corrosion and thermal fatigue composite testing device according to claim 1, characterized in that: The end of the sample (5) is inserted into the interior of the second pressing block (13), and when the sample (5) expands due to heat, a force is generated on the second pressing block (13). The force sensor (15) is used to measure in real time the force generated by the sample (5) on the second pressing block (13) when the sample (5) expands due to heat.
3. The high temperature corrosion and thermal fatigue composite testing device according to claim 1 or 2, characterized in that: It also includes a temperature sensor (20) and a controller (17), wherein the temperature sensor (20) is used to monitor the temperature of the sample (5) in real time and transmit a temperature signal to the controller (17), and the controller (17) is electrically connected to the power supply (16) to control the heating power of the power supply (16) according to the temperature signal of the temperature sensor (20).
4. The high temperature corrosion and thermal fatigue composite testing device according to claim 3, characterized in that: The force sensor (15) is electrically connected to the controller (17); the force sensor (15) transmits a detected force signal to the controller (17); and the controller (17) determines the test progress according to the force value.
5. The high temperature corrosion and thermal fatigue composite testing device according to claim 1, characterized in that: The container (8) is fixed on a crossbeam (7), and the crossbeam (7) is connected to the base plate (1) via a column (6).
6. The high temperature corrosion and thermal fatigue composite testing device according to claim 1, characterized in that: A roller (18) is provided at the bottom of the second pressing block (13), and the second pressing block (13) is placed on a second supporting block (19).
7. The high temperature corrosion and thermal fatigue composite testing device according to claim 1, characterized in that: The sample (5) is made of metal material, and the first pressing block (3) and the second pressing block (13) are both made of conductive material.
8. A high temperature corrosion and thermal fatigue composite testing method, characterized in that: The method is carried out in a testing device according to any one of claims 1 to 7, comprising the following steps: Stage 1: Time t0~t1 is the heating stage; The heating signal takes effect, the first pressing block (3), the first wire (4), the sample (5), the second pressing block (13), the second wire (12) and the power supply (16) form an electric circuit, the sample (5) is powered on and heated, and the temperature rises from room temperature T0 to T1, the temperature sensor (20) monitors the temperature of the sample (5) in real time and transmits the signal to the controller (17), and the adjustment knob (11) is in the closed state at this time; Stage 2: Time t1~t2, which is the high temperature maintenance stage; The heating signal takes effect, the sample (5) continues to be powered on for heating, and the temperature sensor (20) measures the temperature of the sample (5) in real time to ensure that the temperature of the sample (5) is stabilized at T1. At this time, the adjustment knob (11) is in a closed state; Stage 3: Time t2~t3 is the cooling trickle stage; The heating signal fails, the sample (5) is in a cooling process and maintained at T2, and the temperature sensor (20) monitors the temperature of the sample (5) in real time; at this time, the adjusting knob (11) is in an open state, and the saline solution (9) in the guide tube (10) begins to drip downward to the concave portion (51) of the sample (5), and the downstream flow speed can be changed by the adjusting knob (11), thereby changing the corrosive environment; The above t0~t3 is a working condition cycle, and the working condition is then repeated until the test is stopped. In the subsequent working condition cycle, the temperature of the sample (5) is increased from T2 to T1 when it is powered on during the heating stage; Under the cyclic working condition, the force sensor (15) monitors the force signal of the sample (5) in real time and records the maximum force of each cyclic cooling process; when the maximum force of the cooling process in a certain cycle is reduced to 50% of the initial cycle, it is judged that the sample has failed and the test is stopped.
9. The high temperature corrosion and thermal fatigue composite testing method according to claim 8, characterized in that: Temperature T1>T2>T0, where T0 is room temperature.