CN117451548A - High-temperature high-low cycle composite fatigue test method applied to single-crystal superalloy - Google Patents
High-temperature high-low cycle composite fatigue test method applied to single-crystal superalloy Download PDFInfo
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- 238000009661 fatigue test Methods 0.000 title claims abstract description 32
- 239000013078 crystal Substances 0.000 title claims abstract description 29
- 229910000601 superalloy Inorganic materials 0.000 title claims abstract description 28
- 239000002131 composite material Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 53
- 230000006698 induction Effects 0.000 claims abstract description 43
- 238000012360 testing method Methods 0.000 claims abstract description 40
- 238000006073 displacement reaction Methods 0.000 claims abstract description 29
- 238000013461 design Methods 0.000 claims abstract description 22
- 238000009434 installation Methods 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 4
- 230000005284 excitation Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 10
- 230000002159 abnormal effect Effects 0.000 abstract description 6
- 229910045601 alloy Inorganic materials 0.000 abstract description 3
- 239000000956 alloy Substances 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 230000001360 synchronised effect Effects 0.000 abstract description 3
- 238000011089 mechanical engineering Methods 0.000 abstract description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 229910052759 nickel Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a high-temperature high-low cycle composite fatigue test method applied to single-crystal superalloy, belongs to the technical field of mechanical engineering, and solves the problems that in the prior art, the test result is inaccurate and the test flow is too complicated and the sample is easy to damage due to the fact that two design failure points cannot be heated synchronously. According to the invention, two symmetrical design fracture positions are synchronously heated by the two parts of induction heating coils, and the installation space is reserved for installing the frequency modulation block, so that a high-temperature high-low cycle composite fatigue test can be carried out on material samples with abnormal yield phenomena such as single-crystal high-temperature alloy and the like, and the synchronous heating ensures accurate test results; the infrared sensor and the laser displacement sensor are used for non-contact measurement, so that the device is simple to install and stable to use, and can not influence a sample in the use process, thereby reducing the test cost.
Description
Technical Field
The invention relates to the technical field of mechanical engineering, in particular to a high-temperature high-low cycle composite fatigue test method applied to single crystal superalloy.
Background
When the aeroengine works, the turbine rotor blade of the aeroengine bears the composite action of low cycle fatigue caused by centrifugal load, temperature load and the like and high cycle fatigue load caused by pneumatic weak disturbance and system vibration, so that the development of high and low cycle composite fatigue test on aeroengine materials is helpful for exploring the failure mechanism of the aeroengine materials under the real service condition.
Nickel-base single crystal superalloys are widely used in aero-engine turbine blades due to their excellent properties. However, nickel-base single crystal superalloys containing a high volume fraction gamma' exhibit complex yield behavior, i.e., a sharp drop in yield strength over a range as the temperature increases to a certain peak. Specifically, the change of the yield strength with temperature at high temperature can be divided into three stages, namely, the yield strength is basically kept unchanged or slightly reduced from room temperature to about 600 ℃; the yield strength of the alloy is abnormally increased along with the temperature rise at 600-760 ℃; above 760 ℃, the yield strength drops sharply. The change in yield strength is also reflected in the fatigue strength, which also reaches a maximum near 760 ℃.
At present, the test device and the test method for the double-shaft high-low cycle composite fatigue are less. In the prior art, aiming at the high-low cycle composite fatigue test of a plate-shaped sample, the clamp design scheme is that the clamp is connected with a sample clamping section through a bolt to transmit low-cycle load; the excitation rod of the vibration exciter is connected to the boss in the middle of the sample to provide high-cycle load. However, on one hand, since the frequency modulation block is required to be installed in the middle of the sample, the conventional induction coil cannot simultaneously heat two symmetrical design failure points on the sample, which will cause the temperatures of the two symmetrical design failure points to be different; when the test temperature is 750 ℃, the design failure point which is not heated to 750 ℃ at the moment is lower than the design failure point which is heated to 750 ℃ because of the abnormal yield phenomenon of the nickel-based single crystal superalloy, so that the nickel-based single crystal superalloy can be broken firstly in the test process, and the test result is inaccurate; on the other hand, the thermocouple and the strain gauge are always used for monitoring the temperature and the stress in the high-temperature test process, and the test flow is too complicated and is easy to damage the sample. Therefore, the traditional test scheme can not develop a high-temperature high-low cycle composite fatigue test aiming at the material with abnormal yield phenomenon.
In summary, the problem that in the prior art, the test result is inaccurate and the test flow is too complicated and the sample is easily damaged due to the fact that two design failure points cannot be heated synchronously exists.
Disclosure of Invention
In view of the problems, the invention provides a high-temperature high-low cycle composite fatigue test method applied to single crystal superalloy, which solves the problems of inaccurate test results and excessively complex test flow and easy damage to a sample caused by the fact that two design failure points cannot be heated synchronously in the prior art.
The invention provides a high-temperature high-low cycle composite fatigue test method applied to single crystal superalloy, which comprises the following steps:
s1, designing the shape and the size of a plate-shaped sample 1 and a frequency modulation block 2, and processing to obtain the plate-shaped sample 1 and the frequency modulation block 2; wherein, the two ends and the middle of the plate-shaped sample 1 are respectively provided with a clamping section 101 and a boss 102, and the two ends of the boss 102 are provided with two design fracture positions 103; the plate-shaped sample 1 is made of single-crystal superalloy;
s2, performing strain-displacement calibration at normal temperature, adhering a strain gauge to a designed fracture position 103 of the plate-shaped sample 1, and measuring the amplitude of the frequency modulation block 2 under vibration excitation by using a laser displacement sensor to obtain a strain-displacement calibration relation;
s3, calibrating the infrared temperature sensor by using a thermocouple;
s4, assembling test equipment, namely finishing the installation of the two clamps, and adjusting the position of the induction heating coil 3 to enable the axis of the induction heating coil to coincide with the central axes of the two clamps; mounting the plate-like sample 1 to two jigs through the induction heating coil 3;
the induction heating coil 3 comprises two coils with the same spiral direction and is used for heating two design fracture positions 103 respectively; one side between the two coils is connected by a copper pipe, and the other side is provided with an installation space; mounting a frequency modulation block 2 on a boss 102 of a plate-shaped sample 1 through a mounting space between two parts of coils;
s5, developing a high-temperature high-low cycle compound fatigue test.
Further, the step S3 specifically includes:
selecting a thermocouple according to the test temperature and the attribute of the single crystal superalloy, welding the thermocouple to the designed fracture position 103 by using a spot welder, heating the designed fracture position 103 by using an induction heating coil 3, and measuring the temperature by using the thermocouple; when the temperature measured by the thermocouple reaches the test temperature, the temperature of the designed breaking position 103 is measured by using an infrared temperature sensor, and the emissivity of the infrared temperature sensor is adjusted so that the temperature measured by the infrared temperature sensor is the same as the temperature measured by the thermocouple.
Further, the step S5 specifically includes:
turning on high-frequency induction heating equipment, an axial fatigue testing machine and a vibration exciter; the high-frequency induction heating equipment is used for starting the induction heating coil 3 and synchronously heating the two design fracture positions 103 to a test temperature of high temperature above 600 ℃; the axial fatigue testing machine is connected with the two clamps and is used for transmitting low-cycle load to the plate-shaped sample 1; the vibration exciter is used for transmitting high-frequency load to the plate-shaped sample 1 through the frequency modulation block 2;
in the test process, the temperature of two designed fracture positions 103 is monitored by using calibrated infrared temperature sensors, the amplitude of the frequency modulation block 2 at high temperature is monitored by using laser displacement sensors, and the strain and stress corresponding to each displacement are obtained through the strain-displacement calibration relation.
Further, the top-view section of the induction heating coil 3 is a straight-sided ellipse, the number of turns of the two coils of the induction heating coil 3 is the same, and the spiral direction is the same; the spiral direction of the copper pipe is the same as that of the two coils of the induction heating coil 3.
Compared with the prior art, the invention has at least the following beneficial effects:
(1) According to the high-temperature high-low cycle composite fatigue test method applied to the single-crystal superalloy, two symmetrical design fracture positions are synchronously heated through the two parts of induction heating coils, and the installation space is reserved for installing the frequency modulation block, so that the high-temperature high-low cycle composite fatigue test can be carried out on material samples with abnormal yield phenomena such as the single-crystal superalloy, and the synchronous heating ensures accurate test results.
(2) The high-temperature high-low cycle composite fatigue test method applied to the single-crystal superalloy provided by the invention has the advantages that the used infrared sensor and the laser displacement sensor are both in non-contact measurement, the installation is simple, the use is stable, the influence on a sample is avoided in the use process, and the test cost is reduced.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention.
FIG. 1 is a flow chart of the disclosed high temperature high low cycle composite fatigue test method applied to single crystal superalloy;
FIG. 2 is a schematic diagram illustrating the assembly of a plate-like sample, an induction heating coil, and a frequency modulation block according to the present disclosure;
FIG. 3 is a schematic view of an induction heating coil of the present disclosure;
FIG. 4 is a schematic view of a plate-like specimen disclosed in the present invention;
FIG. 5 is a graph of strain versus displacement calibration as disclosed herein.
Reference numerals:
1-plate-like test pieces; 2-frequency modulation blocks; 3-an induction heating coil; 101-clamping sections; 102-a boss; 103-design breaking point.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present invention and features in the embodiments may be combined with each other. In addition, the invention may be practiced otherwise than as specifically described and thus the scope of the invention is not limited by the specific embodiments disclosed herein.
The invention discloses a high-temperature high-low cycle composite fatigue test method applied to single crystal superalloy, as shown in figure 1, comprising the following steps:
s1, designing and processing the plate-shaped sample 1 and the frequency modulation block 2 according to the material properties.
Specifically, the shape and the size of the plate-shaped sample 1 and the frequency modulation block 2 are designed, the density and the elastic modulus of the material at the test temperature are inquired, and the length and the thickness of the plate-shaped sample 1 are selected according to the density and the elastic modulus; the finite element software is used for verifying whether the resonance frequency of the composite structure formed by the plate-shaped sample 1 and the frequency modulation block 2 is in a frequency range which can be provided by the vibration exciter of 200-2000Hz, the specific numerical value is related to the performance of the vibration exciter, and the resonance frequency meets the requirement through design.
The plate-shaped sample 1 has a symmetrical structure in the length, width and height directions, and the symmetrical structure is easy to obtain a good vibration mode and a large amplitude. The two ends and the middle of the plate-shaped sample 1 are respectively provided with a clamping section 101 and a boss 102. The clamping section 101 is double-wedge-shaped, and the size of the clamping section is matched with that of the clamp; the boss 102 is used for installing the frequency modulation block 2, the frequency modulation block 2 is not contacted with the designed fracture position 103, and the influence of contact stress on the fatigue performance of the sample is eliminated; two design fracture positions 103 are arranged at two ends of the boss 102; a flat section is provided between the boss 102 and the clamping section 101. The plate sample 1 was made of a single crystal superalloy.
Plate sample 1 and fm block 2 were obtained by processing.
S2, obtaining a strain-displacement calibration relation.
Specifically, strain-displacement calibration is performed at normal temperature, and a strain gauge is adhered to the designed breaking position 103 of the plate-shaped sample 1, wherein the direction of the grid wires of the strain gauge is parallel to the axial direction of the sample. The laser displacement sensor is aligned to the frequency modulation block 2, so that laser emitted by the laser displacement sensor is positioned in a first-order bending plane of the combined structure of the plate-shaped sample 1 and the frequency modulation block 2. And measuring the amplitude of the frequency modulation block 2 under the vibration excitation of the vibration exciter by using a laser displacement sensor, and obtaining the strain-displacement calibration relation by adjusting the output power of the vibration exciter and recording the amplitudes of the frequency modulation block 2 corresponding to different strains.
And S3, calibrating the infrared temperature sensor by using a thermocouple.
Specifically, a thermocouple is selected according to the test temperature and the properties of the single crystal superalloy, the thermocouple is welded to the designed fracture position 103 by using a spot welder, the designed fracture position 103 is heated by using an induction heating coil 3, and the temperature of the thermocouple is measured by using the thermocouple; when the temperature measured by the thermocouple reaches the test temperature, the temperature of the designed breaking position 103 is measured by using an infrared temperature sensor, and the emissivity of the infrared temperature sensor is adjusted so that the temperature measured by the infrared temperature sensor is the same as the temperature measured by the thermocouple.
And S4, assembling the test equipment.
Specifically, the two clamps are installed, and the position of the induction heating coil 3 is adjusted so that the central axis of the induction heating coil coincides with the central axes of the two clamps; mounting the plate-like sample 1 to two jigs through the induction heating coil 3; frequency modulation block 2 is installed, and the infrared temperature sensor and the laser displacement sensor are aligned to a preset position.
The induction heating coil 3 comprises two coils with the same spiral direction and is used for heating two design fracture positions 103 respectively; one side between the two coils is connected by a copper pipe, and the other side is provided with an installation space; the frequency modulation block 2 is mounted on the boss 102 of the plate-like sample 1 through the mounting space between the two-part coils.
S5, developing a high-temperature high-low cycle compound fatigue test.
Specifically, high-frequency induction heating equipment, an axial fatigue testing machine and a vibration exciter are turned on; the high-frequency induction heating equipment is used for starting the induction heating coil 3 and synchronously heating the two design fracture positions 103 to a test temperature of high temperature above 600 ℃; the axial fatigue testing machine is connected with the two clamps and is used for transmitting low-cycle load to the plate-shaped sample 1; the vibration exciter is used for transmitting high-frequency load to the plate-shaped sample 1 through the frequency modulation block 2.
Since the two coils of the induction heating coil 3 are connected by the copper pipe, the two design breaking positions 103 can be heated simultaneously by only one high-frequency induction heating apparatus. The middle positions of the two coils correspond to the two designed breaking positions 103 of the plate-shaped sample 1, respectively, and are the positions with the highest temperature.
In the test process, the temperature of two designed fracture positions 103 is monitored by using calibrated infrared temperature sensors, the amplitude of the frequency modulation block 2 at high temperature is monitored by using laser displacement sensors, and the strain and stress corresponding to each displacement are obtained through the strain-displacement calibration relation.
Compared with the prior art, the high-temperature high-low cycle composite fatigue test method applied to the single-crystal superalloy disclosed by the invention has the advantages that two symmetrical design fracture positions 103 are synchronously heated by the two parts of induction heating coils 3, and the installation space is reserved for installing the frequency modulation block, so that the high-temperature high-low cycle composite fatigue test can be carried out on material samples with abnormal yield phenomena such as the single-crystal superalloy, and the synchronous heating ensures accurate test results; the infrared sensor and the laser displacement sensor are used for non-contact measurement, so that the device is simple to install and stable to use, and can not influence a sample in the use process, thereby reducing the test cost.
In order to illustrate the effectiveness of the method according to the present invention, the following describes the above technical solution of the present invention in detail by means of a specific embodiment, which is as follows:
example 1
The purpose of the example is to carry out a high-temperature high-low cycle composite fatigue test on a nickel-based single crystal superalloy. The materials used in this example have an abnormal yield effect, with the yield strength remaining substantially unchanged or slightly reduced at room temperature to around 600 ℃; the yield strength of the alloy is abnormally increased along with the temperature rise at 600-760 ℃; above 760 ℃, the yield strength drops sharply. The test temperature is set to 760 ℃, the low-cycle load requirement reaches 700MPa, and the transverse high-cycle load requirement reaches 120MPa. The specific test was performed according to the following protocol:
the plate-like sample 1 and the frequency modulation block 2 are designed according to the material properties. Fig. 4 is a schematic structure of a plate-shaped sample 1, wherein a double-wedge-shaped clamping section 101 is convenient to install, and two design fracture positions 103 are arranged at two ends of a boss 102; between the boss 102 and the clamping section 101 there is also a straight section, optionally having a width of 1.2mm, a width of 5mm and a length of 25mm.
And obtaining a strain-displacement calibration relation. A strain gauge was attached to the designed breaking point 103 of the plate sample 1 in fig. 4 for recording the strain at this point, and the amplitude at this point was recorded using a laser displacement sensor in alignment with the frequency modulator block 2. And applying vibration load at normal temperature, adjusting the output power of the vibration exciter to obtain 6 different strains, and recording the amplitude corresponding to each strain to obtain the strain-displacement calibration relationship shown in figure 5.
The infrared temperature sensor is calibrated. The temperature calibration is performed by selecting a type k thermocouple, fixing the thermocouple at the designed breaking position 103 by using a spot welder, selecting the current to be 60A during spot welding, and measuring the temperature at the position by using an infrared temperature sensor. The induction heating coil 3 shown in fig. 3 was started, and when the temperature measured by the thermocouple reached the test temperature of 760 ℃, the emissivity of the infrared temperature sensor was adjusted, and when the emissivity was 0.78, the temperature measured by the infrared temperature sensor was the same as the temperature measured by the thermocouple.
The test equipment is assembled. In the installation process, firstly, the induction heating coil 3 is placed at a preset position, so that the central axis of the induction heating coil 3 coincides with the central axes of the clamps, then, the plate-shaped sample 1 passes through the induction heating coil 3 to be installed on the two clamps, and finally, the frequency modulation block 2 is installed, as shown in fig. 2.
After the preparation work is finished, a high-temperature high-low cycle compound fatigue test is carried out.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.
Claims (4)
1. The high-temperature high-low cycle composite fatigue test method applied to the single crystal superalloy is characterized by comprising the following steps of:
s1, designing the shape and the size of a plate-shaped sample (1) and a frequency modulation block (2), and processing to obtain the plate-shaped sample (1) and the frequency modulation block (2); wherein, the two ends and the middle of the plate-shaped sample (1) are respectively provided with a clamping section (101) and a boss (102), and the two ends of the boss (102) are provided with two designed fracture positions (103); the plate-shaped sample (1) is made of single-crystal superalloy;
s2, performing strain-displacement calibration at normal temperature, adhering a strain gauge to a designed fracture position (103) of a plate-shaped sample (1), and measuring the amplitude of a frequency modulation block (2) under vibration excitation by using a laser displacement sensor to obtain a strain-displacement calibration relation;
s3, calibrating the infrared temperature sensor by using a thermocouple;
s4, assembling test equipment, namely finishing the installation of the two clamps, and adjusting the position of the induction heating coil (3) to enable the axis of the induction heating coil to coincide with the central axes of the two clamps; mounting a plate-like specimen (1) to two jigs through an induction heating coil (3);
the induction heating coil (3) comprises two coils with the same spiral direction and is used for heating two design fracture positions (103) respectively; one side between the two coils is connected by a copper pipe, and the other side is provided with an installation space; mounting a frequency modulation block (2) on a boss (102) of a plate-shaped sample (1) through a mounting space between two parts of coils;
s5, developing a high-temperature high-low cycle compound fatigue test.
2. The high-temperature high-low cycle composite fatigue test method applied to single crystal superalloy according to claim 1, wherein step S3 specifically comprises:
selecting a thermocouple according to the test temperature and the attribute of the single crystal superalloy, welding the thermocouple to a designed fracture position (103) by using a spot welder, heating the designed fracture position (103) by using an induction heating coil (3), and measuring the temperature by using the thermocouple; when the temperature measured by the thermocouple reaches the test temperature, the temperature of the designed breaking position (103) is measured by using an infrared temperature sensor, and the emissivity of the infrared temperature sensor is adjusted so that the temperature measured by the infrared temperature sensor is the same as the temperature measured by the thermocouple.
3. The high-temperature high-low cycle composite fatigue test method applied to single crystal superalloy according to claim 2, wherein step S5 specifically comprises:
turning on high-frequency induction heating equipment, an axial fatigue testing machine and a vibration exciter; the high-frequency induction heating equipment is used for starting the induction heating coil (3) and synchronously heating the two designed breaking positions (103) to a test temperature of higher than 600 ℃; the axial fatigue testing machine is connected with the two clamps and is used for transmitting low-cycle load to the plate-shaped sample (1); the vibration exciter is used for transmitting high-frequency load to the plate-shaped sample (1) through the frequency modulation block (2);
in the test process, the temperature of two designed fracture positions (103) is monitored by using a calibrated infrared temperature sensor, the amplitude of the frequency modulation block (2) at high temperature is monitored by using a laser displacement sensor, and the strain and stress corresponding to each displacement are obtained through the strain-displacement calibration relation.
4. The high-temperature high-low cycle composite fatigue test method applied to single-crystal superalloy according to claim 3, wherein the overhead cross section of the induction heating coil (3) is a straight-sided ellipse, the turns of the two coils of the induction heating coil (3) are the same, and the spiral directions are the same; the spiral direction of the copper pipe is the same as that of the two coils of the induction heating coil (3).
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| CN202311540994.1A CN117451548A (en) | 2023-11-17 | 2023-11-17 | High-temperature high-low cycle composite fatigue test method applied to single-crystal superalloy |
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| CN202311540994.1A CN117451548A (en) | 2023-11-17 | 2023-11-17 | High-temperature high-low cycle composite fatigue test method applied to single-crystal superalloy |
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