A device and method for measuring the high-temperature creep of metallic materials.

Abstract

This invention relates to the field of material creep testing technology, specifically to a measuring device and method for measuring the high-temperature creep of metallic materials. The device includes a testing machine, a sample clamp, and a testing device for detecting the creep of a metallic sample. The testing device includes an extender rod connected to the metallic test sample, a retainer for mounting the extender rod, and a balancing device for limiting the movement of the retainer. The retainer includes a fixing part connected to the extender rod and a measuring part for measuring the movement of the extender rod. The balancing device includes a guide rail parallel to the creep direction of the metallic test sample, a slider sliding on the guide rail, and a balancer for limiting the position of the slider. The fixing part is mounted on the slider. By using the extender rod to directly contact the sample under pressure, and by using an extender rod with a ceramic structure, the higher heat resistance and the property that ceramics are not easily deformed under long-term high-temperature environments are utilized to reduce the error in measuring creep elongation at high temperatures.

Description

Technical Field

[0001] This invention relates to the field of material creep testing technology, specifically to a measuring device and method for measuring the high-temperature creep of metallic materials. Background Technology

[0002] Creep testing is a material mechanical property test used to determine the slow plastic deformation of a specimen under prolonged constant temperature and stress. The higher the temperature or the greater the stress, the more pronounced the creep phenomenon. Creep can occur under a single stress (tensile, compressive, or torsional) or under combined stress. Typical creep tests are conducted under uniaxial tensile conditions.

[0003] During creep testing, it is necessary to measure the creep elongation of the specimen. Existing creep elongation detection devices generally consist of a creep deformation guide device mounted on the specimen's ribs and two displacement sensors assembled on it. For example... Figure 1 As shown, the test apparatus for measuring creep elongation is a guided measurement. The lead-out rod is mounted on the rib of the specimen via a clamp, and two grating rulers are installed on opposite sides of the specimen to indicate strain. After the specimen is clamped, the specimen undergoes axial deformation during loading and holding. The corresponding displacement of the clamping ring connected to the rib of the specimen causes the relative displacement of the upper and lower lead-out rods. The displacement of the lead-out rods is transmitted to the top block of the grating rulers through the rotation of the pulleys on the connecting rods, thus realizing the acquisition of the specimen deformation. When using existing measuring devices and methods to measure the specimen in creep tests, poor coaxiality and assembly of the specimen often lead to inaccurate acquisition of creep deformation. To prevent this problem and improve the measurement accuracy, the test requires the elongation to be collected from both sides of the specimen (180° apart), and the difference between the elongations on both sides must be within 10%. Therefore, when clamping the lead-out rods, it is necessary to adjust the coaxiality on both sides to meet the requirements.

[0004] Creep testing is a long-duration, high-temperature test. During the test, the lead-in rod is exposed to a high-temperature furnace for an extended period. This prolonged high-temperature environment causes the lead-in rod to deform, and even slight deformation can significantly affect the coaxiality of the measuring device, leading to substantial errors in the deformation measurement and compromising the accuracy of the test results. Furthermore, connecting the strain acquisition device via clamps places extremely high demands on the machining precision of the sample's ribs and the assembly with the clamps. This results in frequent adjustments during the assembly process, leading to very low work efficiency.

[0005] Therefore, in the existing technology, when using the metal lead-out rod guided measurement method, the lead-out rod is prone to deformation under high temperature for a long time, resulting in inaccurate creep test measurement. In addition, the sample installation requires high sample processing requirements, repeated adjustments, and is difficult to install. Therefore, those skilled in the art urgently need a creep test deformation measurement device that is easy to process and install and improves the accuracy of creep tests. Summary of the Invention

[0006] To address the problems existing in the prior art, the purpose of this invention is to provide a measuring device and method that changes the original guided measurement method, reduces the difficulty of sample processing, facilitates sample installation, and improves the measurement accuracy of creep deformation under long-term high-temperature conditions.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: a measuring device for high-temperature creep of metallic materials, comprising a testing machine, a sample clamp for connecting a high-temperature creep metallic test specimen to the testing machine, a detection device for detecting the creep of the metallic specimen, the detection device comprising an extension rod connected to the metallic test specimen, a retainer for mounting the extension rod, and a balancing device for limiting the movement of the retainer, the retainer comprising a fixing part connected to the extension rod, and a measuring part for measuring the movement of the extension rod, the balancing device comprising a guide rail arranged parallel to the creep direction of the metallic test specimen, a slider sliding on the guide rail, and a balancer for limiting the position of the slider, the fixing part being mounted on the slider.

[0008] The aforementioned measuring device for high-temperature creep of metallic materials includes an export rod made of cylindrical ceramic material, a sample-connecting export mounting body at the front end of the export rod, and a rear end mounted on a fixing part. The export rod comprises an upper export rod and a lower export rod.

[0009] The aforementioned measuring device for high-temperature creep of metallic materials includes a fixing part comprising a fixing body mounted on a slider, ear plates on both sides of the fixing body, through holes on the ear plates, fixing protrusions on the sides of the ear plates, a V-shaped groove for placing a guide rod on the fixing body, a pressure plate above the V-shaped groove, and an upper fixing part connected to the upper guide rod and a lower fixing part connected to the lower guide rod.

[0010] The aforementioned measuring device for measuring the high-temperature creep of metallic materials includes a measuring unit comprising a grating ruler, an outer fixing rod connected to the ear plate through hole of the upper fixing body, and an inner fixing rod connected to the ear plate through hole of the lower fixing body. The bottom end of the outer fixing rod is connected to an upper fixing plate, and the bottom end of the inner fixing rod is connected to a lower fixing plate. The upper fixing plate is provided with an inner rod hole for the inner fixing rod to pass through. One end of the grating ruler is fixedly connected to the center point of the lower fixing plate. The center point of the upper fixing plate is provided with a ruler hole for the grating ruler to pass through the upper fixing plate. A pointer is provided at the ruler hole, and the grating ruler is slidably sleeved in the ruler hole.

[0011] The aforementioned measuring device for high-temperature creep of metallic materials includes a balancer comprising a pulley chamber disposed at the top of a guide rail, a first counterweight and a second counterweight disposed outside the pulley chamber, a first traction line connecting the first counterweight to the upper fixed part, and a second traction line connecting the second counterweight to the lower fixed part. The pulley chamber is provided with a first pulley group and a second pulley group. One end of the first traction line is fixed to a fixed protrusion on the upper fixed part, and the other end passes around the first pulley group and connects to the first counterweight. One end of the second traction line is fixed to a fixed protrusion on the lower fixed part, and the other end passes around the second pulley group and connects to the second counterweight.

[0012] The aforementioned measuring device for high-temperature creep of metallic materials includes an upper slider for mounting an upper fixed part and a lower slider for mounting a lower fixed part. The weight of the first counterweight is equal to the sum of the weights of the upper slider, the upper fixed part, and the upper guide rod, and the weight of the second counterweight is equal to the sum of the weights of the lower slider, the lower fixed part, and the lower guide rod.

[0013] The aforementioned measuring device for high-temperature creep of metallic materials further includes a connector for connecting to a testing machine. The connector includes a support column fixedly connected to the testing machine, a mounting bracket for mounting guide rails, and a support arm for connecting the support column and the mounting bracket. The support arm is fixedly connected to the mounting bracket and rotatably connected to the support column. A locking device for limiting the position of the support arm is provided between the support arm and the support column. The testing device is symmetrically arranged on both sides of the metallic sample.

[0014] The aforementioned measuring device for high-temperature creep of metallic materials includes a wedge-shaped surface disposed on the upper and lower sides of the fixed rod, and a contact surface disposed at the front end of the fixed rod.

[0015] A method for measuring the high-temperature creep of metallic materials using an apparatus as described in any of the preceding claims, comprising the following steps:

[0016] Step 1: Connect the metal specimen to the test fixture, apply a preload to eliminate assembly gaps and fix the specimen in place;

[0017] Step 2: Rotate the connector, adjust the slider to bring the distance of the guide rod of the high-temperature creep measuring device to the specified gauge length, and tighten the guide rod against the sample to secure the connector.

[0018] Step 3: Based on the estimated deformation of the sample, adjust the extension height of the grating ruler probe to a suitable measurement range;

[0019] Step 4: Install and adjust the high-temperature creep measuring device on the other side according to steps 2 and 3 above.

[0020] Step 5: Slide the high-temperature furnace of the testing machine down so that the sample is in the center of the furnace body, and turn on the sample heating to the specified temperature;

[0021] Step Six: Control the temperature, apply the specified test load to the sample, read the creep change data of the metal material through the grating ruler, and output the creep elongation at the specified time.

[0022] In the above-mentioned measuring device for high-temperature creep of metallic materials, in step five, an outlet groove is provided on the side wall of the high-temperature furnace, and when the high-temperature furnace descends, the outlet rod extends out of the high-temperature furnace from the outlet groove.

[0023] The beneficial effects of this invention, a device for measuring the high-temperature creep of metallic materials, are as follows: By using an export rod that directly contacts the sample under pressure, and employing a ceramic export rod, the higher heat resistance and resistance to deformation of ceramics under prolonged high-temperature conditions are utilized, reducing errors in measuring creep elongation at high temperatures. The installation method, where the ceramic export rod directly contacts the sample, reduces the difficulty of sample processing, omitting the need for ribbed structures and allowing the use of smooth-structured samples. This lowers the technical requirements for sample processing and installation difficulty, making the assembly process more convenient and faster, reducing workload, and improving sample installation efficiency. Furthermore, the use of an upper and lower export rod, along with a fixture for mounting the two export rods, and the fixture sliding on a guide rail parallel to the sample, ensures that the displacement of the export rods is correlated with the deformation of the sample. With the same measurement parameters, the V-groove and pressure plate structure facilitates the connection and installation of the guide rod and the fixture. The main structure of the measuring unit consists of inner and outer fixing rods and upper and lower fixing plates, along with the ear plate through-holes on the fixing plates, allowing the measuring unit and the fixing unit to be integrated into a whole. The grating ruler is fixedly mounted on the lower fixing plate, and the upper fixing plate has a ruler hole and pointer through which the grating ruler passes. The distance change between the upper and lower guide rods is converted into the distance change between the upper and lower fixtures, and then into the distance change between the upper and lower fixing plates, thus simplifying the deformation reading method. By using a balancer, the fixture and slider can overcome the influence of their own weight, ensuring that the fixture moves with the deformation of the sample. By setting a connector, after the sample is adjusted, it is easy to quickly adjust the detection device to the position where the sample needs to be measured and fix it.

[0024] The beneficial effects of the measurement method of the device for measuring the high-temperature creep of metallic materials of the present invention are: by using a ceramic guide rod, the deformation of the sample is changed from the traditional method of reading inside the high-temperature furnace to the method of reading outside the high-temperature furnace, which reduces the influence of high-temperature deformation of the measuring device inside the high-temperature furnace on the measurement results. At the same time, a guide groove is set on the side wall of the high-temperature furnace to facilitate the installation of the guide rod. Attached Figure Description

[0025] Figure 1 This is an existing technology for measuring creep samples and testing devices.

[0026] Figure 2 This invention relates to a creep test specimen and a measuring device.

[0027] Figure 3 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 4 This is a schematic diagram of the measuring device structure of the present invention;

[0029] Figure 5 This is a schematic diagram showing the installation position of the balancing device of the present invention;

[0030] Figure 6 This is a schematic diagram of the exploded structure of the measuring device of the present invention;

[0031] Figure 7 This is a schematic diagram of the balancer structure of the present invention;

[0032] Figure 8 This is a side view of the high-temperature furnace structure of the present invention.

[0033] Explanation of reference numerals in the attached drawings: Testing machine 10, Sample clamp 11, Detection device 20, Guide rod 21, Wedge surface 211, Contact surface 212, Upper guide rod 213, Lower guide rod 214, Fixer 30, Fixing part 31, Fixing body 310, Ear plate 311, Through hole 312, Fixing protrusion 313, V-groove 314, Pressure plate 315, Upper fixing part 301, Lower fixing part 302, Measuring part 32, Grating ruler 321, Outer fixing rod 322, Inner fixing rod 323, Upper fixing plate 324, Lower fixing plate 3 25, Inner rod hole 326, Ruler hole 327, Balancing device 40, Guide rail 41, Slider 42, Upper slider 421, Lower slider 422, Balancer 43, Pulley chamber 431, First counterweight 432, Second counterweight 433, First traction line 434, Second traction line 435, First pulley block 436, Second pulley block 437, Connector 50, Support column 51, Fixing frame 52, Support arm 53, Fixing arm 531, Adjusting arm 532, High temperature furnace 60, Outlet groove 61, Clamp 70, Sample rib 71. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be described below in conjunction with specific embodiments and accompanying drawings.

[0035] like Figure 1 As shown, in the prior art, the test device for measuring creep elongation is a guided measurement. The lead-out rod is installed on the specimen rib 71 via a clamp 70, and two extensometers are installed on opposite sides of the specimen to indicate strain. After the specimen is clamped, the specimen undergoes axial deformation during loading and holding. The corresponding displacement of the clamp connected to the specimen rib causes the relative displacement of the upper and lower lead-out rods. The displacement of the lead-out rods is transmitted to the top block of the grating ruler through the rotation of the pulley on the connecting rod, thus realizing the acquisition of the specimen deformation.

[0036] like Figure 2-8 As shown, a measuring device for high-temperature creep of metallic materials includes a testing machine 10, a sample clamp 11 for connecting the high-temperature creep metal test specimen to the testing machine, and a detection device 20 for detecting the creep of the metal specimen. The testing machine and sample clamp are the same as those used in existing high-temperature creep tests. This application mainly focuses on improving the detection device for measuring the deformation of the specimen in creep tests.

[0037] The testing device includes an export rod 21 connected to a metal test specimen, a retainer 30 for mounting the export rod, and a balancing device 40 for limiting the movement of the retainer. The export rod is made of cylindrical ceramic material, and the front end of the export rod is provided with an export mounting body for specimen connection. The export mounting body includes wedge-shaped surfaces 211 provided on the upper and lower sides of the retainer, and a contact surface 212 provided on the front end of the retainer. The contact surface directly presses against the specimen surface, increasing the friction between the specimen and the export rod support and preventing slippage. The wedge-shaped surfaces are used to reduce the cross-sectional area of ​​the export rod and improve the accuracy of the connection between the export rod and the specimen. The export rod is divided into an upper export rod 213 and a lower export rod 214 on the upper and lower sides of the specimen.

[0038] The retainer includes a retaining part 31 connected to the guide rod, and a measuring part 32 for measuring the movement position of the guide rod, with the rear end of the guide rod mounted on the retaining part.

[0039] The balancing device includes a guide rail 41 arranged parallel to the creep direction of the metal test specimen, a slider 42 sliding on the guide rail, a balancer 43 for limiting the position of the slider, and a fixing part mounted on the slider.

[0040] The fixing part includes a fixing body 310 mounted on the slider. Ear plates 311 are provided on both sides of the fixing body. Through holes 312 are provided on the ear plates. Fixing protrusions 313 are provided on the sides of the ear plates. A V-groove 314 for placing the guide rod is provided on the fixing body. A pressure plate 315 is provided above the V-groove. The fixing part includes an upper fixing part 301 connected to the upper guide rod and a lower fixing part 302 connected to the lower guide rod. The guide rod is installed in the V-groove, pressed down by the pressure plate, and the pressure plate is fixed to the groove opening of the V-groove by bolts.

[0041] The slider includes an upper slider 421 for mounting the upper fixing part and a lower slider 422 for mounting the lower fixing part.

[0042] The measuring unit includes a grating ruler 321 for measuring the size of deformation, an outer fixing rod 322 connected to the ear plate through hole of the upper fixing body, and an inner fixing rod 323 connected to the ear plate through hole of the lower fixing body. Two inner and two outer fixing rods are provided. The inner and outer fixing rods are parallel to the guide rail. The bottom end of the outer fixing rod is connected to the upper fixing plate 324, and the bottom end of the inner fixing rod is connected to the lower fixing plate 325. The upper and lower fixing plates are arranged in parallel. The upper fixing plate is provided with an inner rod hole 326 for the inner fixing rod to pass through. One end of the inner fixing rod is fixedly installed on the ear plate through hole of the lower fixing body, and the other end passes through the inner rod hole and is fixedly installed on the lower fixing plate. The inner fixing rod is slidably sleeved with the upper fixing plate. One end of the outer fixing rod is fixedly connected to the ear plate through hole of the upper fixing body, and the other end is fixedly connected to the upper fixing plate.

[0043] The upper fixed plate has a ruler hole 327 at its center point for the grating ruler to pass through. One end of the grating ruler is fixedly connected to the center point of the lower fixed plate, and the other end is slidably fitted into the ruler hole, extending to the top of the upper fixed plate. A pointer for reading the grating ruler is provided at the ruler hole. The grating ruler is perpendicular to both the upper and lower fixed plates.

[0044] The balancer includes a pulley compartment 431 located at the top of the guide rail, a first counterweight 432 and a second counterweight 433 located outside the pulley compartment, a first traction line 434 connecting the first counterweight to the upper fixed part, a second traction line 435 connecting the second counterweight to the lower fixed part, a first pulley assembly 436 and a second pulley assembly 437 located inside the pulley compartment, one end of the first traction line being fixed to the fixed protrusion of the upper fixed part, and the other end passing around the first pulley assembly and connecting to the first counterweight, and one end of the second traction line being fixed to the fixed protrusion of the lower fixed part, and the other end passing around the second pulley assembly and connecting to the second counterweight.

[0045] The weight of the first counterweight is equal to the sum of the weights of the upper slider, the upper fixed part, and the upper guide rod. The weight of the second counterweight is equal to the sum of the weights of the lower slider, the lower fixed part, and the lower guide rod.

[0046] The first pulley group includes two pulleys, left and right. The left pulley ensures that the first traction line and the fixed part are on the same vertical line, and the right pulley ensures that the first traction line and the first counterweight are on the same straight line. Through the combination of the two pulleys, the upper slider is ensured to be subjected to only vertical force on the guide rail, reducing the influence of external forces. Similarly, the second pulley group has the same number of pulleys as the first pulley group. The second pulley group, through the two pulleys, ensures that the lower slider is also subjected to only vertical force on the guide rail, reducing the influence of external forces.

[0047] Furthermore, the testing device also includes a connector 50 for connecting to the testing machine base. The connector includes a support column 51 fixedly connected to the testing machine base, a mounting bracket 52 for mounting guide rails, and a support arm 53 for connecting the support column and the mounting bracket. The support arm is fixedly connected to the mounting bracket and rotatably connected to the support column. The support arm can be connected by bearings. A locking device is provided between the support arm and the support column to limit the position of the support arm. The locking device is used to lock the rotational position of the rotatable connection. The testing device is symmetrically arranged on both sides of the metal sample.

[0048] Furthermore, to improve the flexibility of the detection device, the support arm includes a fixed arm 531 connected to a support column at one end and an adjusting arm 532 connected to a fixed frame at one end. The other end of the fixed arm is provided with a mounting groove and a mounting through hole. The other end of the adjusting arm is provided with an adjusting through hole. One end of the adjusting through hole is inserted into the mounting groove. Fastening bolts for locking the fixed arm and the adjusting arm are provided in the mounting through hole and the adjusting through hole.

[0049] Furthermore, in order to facilitate the extension rod being led out of the high-temperature furnace 60 during the high-temperature creep test, an extension groove 61 is provided on the side wall of the high-temperature furnace. When the high-temperature furnace descends, the extension rod extends out of the high-temperature furnace from the extension groove.

[0050] When using the detection device of this application to measure the high-temperature creep of metallic materials, the method steps include:

[0051] Step 1: Connect the metal specimen to the test fixture, apply a preload to eliminate assembly gaps and fix the specimen in place;

[0052] Step 2: Rotate the connector, adjust the slider to bring the distance of the guide rod of the high-temperature creep detection device to the specified gauge length, and tighten the guide rod against the sample to secure the connector.

[0053] Step 3: Based on the estimated deformation of the sample, adjust the extension height of the grating ruler probe to a suitable measurement range;

[0054] Step 4: Install and adjust the high-temperature creep measuring device on the other side according to steps 2 and 3 above.

[0055] Step 5: Slide the high-temperature furnace of the testing machine down so that the sample is in the center of the furnace body, and turn on the sample heating to the specified temperature;

[0056] Step 6: Maintain the temperature, apply the specified test load to the sample, read the creep change data of the metal material through the grating ruler, and output the creep elongation at the specified time.

[0057] Before the test begins, a suitable guide rod needs to be selected according to the sample to prevent the connection from being loose due to the size and length of the guide rod not matching the sample.

[0058] During the test, one end of a ceramic rod is inserted into the high-temperature furnace, resting on the sample, while the other end extends through a guide slot. The high-temperature furnace is lowered to a position where the sample is centered within the furnace. Insulation plates are installed to ensure temperature uniformity within the furnace. The heating system is then activated, and the sample is heated to the rated temperature and held for 1-2 hours. A specified tensile force is then applied and maintained using the testing machine. During the creep test, the sample deforms under this tensile force. Outside the furnace, the upper and lower ceramic rods and the fixing plate connected to them change with the deformation distance of the sample. A grating ruler connected to the fixing plate detects this deformation, thus accurately measuring the sample's deformation during the high-temperature creep test.

[0059] The above embodiments are merely illustrative of the structural concept and features of the present invention, intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made based on the essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A measuring device for high-temperature creep of metallic materials, comprising a testing machine, a sample clamp for connecting a high-temperature creep-bearing metallic test specimen to the testing machine, and a detection device for detecting the creep of the metallic specimen, characterized in that: The testing device includes an export rod connected to a metal test specimen, a fixture for mounting the export rod, and a balancing device for limiting the movement of the fixture. The fixture includes a fixing part connected to the export rod and a measuring part for measuring the movement of the export rod. The balancing device includes a guide rail parallel to the creep direction of the metal test specimen, a slider sliding on the guide rail, and a balancer for limiting the position of the slider. The fixing part is mounted on the slider. The export rod is made of cylindrical ceramic material. The front end of the export rod is provided with an export mounting body for connecting to the specimen. The rear end of the export rod is mounted on the fixing part. The export rod includes an upper export rod and a lower export rod. The fixing part includes a fixture mounted on the slider. The fixture has ear plates on both sides, through holes on the ear plates, and fixing protrusions on the sides of the ear plates. The fixture has a V-groove for placing the export rod, and a pressure plate above the V-groove. The fixing part includes an upper fixing part connected to the upper export rod and a lower fixing part connected to the lower export rod. The export mounting body includes wedge-shaped surfaces on the upper and lower sides of the fixing rod and a contact surface at the front end of the fixing rod.

2. The measuring device for high-temperature creep of metallic materials according to claim 1, characterized in that: The measuring unit includes a grating ruler, an outer fixing rod connected to the ear plate through hole of the upper fixing body, and an inner fixing rod connected to the ear plate through hole of the lower fixing body. The bottom end of the outer fixing rod is connected to an upper fixing plate, and the bottom end of the inner fixing rod is connected to a lower fixing plate. The upper fixing plate is provided with an inner rod hole for the inner fixing rod to pass through. One end of the grating ruler is fixedly connected to the center point of the lower fixing plate. The center point of the upper fixing plate is provided with a ruler hole for the grating ruler to pass through the upper fixing plate. A pointer is provided at the ruler hole, and the grating ruler is slidably sleeved in the ruler hole.

3. The measuring device for high-temperature creep of metallic materials according to claim 2, characterized in that: The balancer includes a pulley chamber located at the top of the guide rail, a first counterweight and a second counterweight located outside the pulley chamber, a first traction line connecting the first counterweight to the upper fixed part, and a second traction line connecting the second counterweight to the lower fixed part. The pulley chamber is equipped with a first pulley group and a second pulley group. One end of the first traction line is fixed to the fixed protrusion of the upper fixed part, and the other end passes around the first pulley group and connects to the first counterweight. One end of the second traction line is fixed to the fixed protrusion of the lower fixed part, and the other end passes around the second pulley group and connects to the second counterweight.

4. The measuring device for high-temperature creep of metallic materials according to claim 3, characterized in that: The slider includes an upper slider for mounting the upper fixing part and a lower slider for mounting the lower fixing part. The weight of the first counterweight is equal to the sum of the weights of the upper slider, the upper fixing part, and the upper guide rod. The weight of the second counterweight is equal to the sum of the weights of the lower slider, the lower fixing part, and the lower guide rod.

5. The measuring device for high-temperature creep of metallic materials according to claim 4, characterized in that: The testing device further includes a connector for connecting to the testing machine base. The connector includes a support column fixedly connected to the testing machine base, a fixed frame for mounting guide rails, and a support arm for connecting the support column and the fixed frame. The support arm is fixedly connected to the fixed frame and rotatably connected to the support column. A locking device for limiting the position of the support arm is provided between the support arm and the support column. The testing device is symmetrically arranged on both sides of the metal sample.

6. A method for measuring the high-temperature creep of metallic materials using the apparatus described in any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Connect the metal specimen to the test fixture, apply a preload to eliminate assembly gaps and fix the specimen in place; Step 2: Rotate the connector, adjust the slider to bring the distance of the guide rod of the high-temperature creep measuring device to the specified gauge length, and tighten the guide rod against the sample to secure the connector. Step 3: Based on the estimated deformation of the sample, adjust the extension height of the grating ruler probe to a suitable measurement range; Step 4: Install and adjust the high-temperature creep measuring device on the other side according to Steps 2 and 3 above; Step 5: Slide the high-temperature furnace of the testing machine down so that the sample is in the center of the furnace body, and turn on the sample heating to the specified temperature; Step Six: Control the temperature, apply the specified test load to the sample, read the creep change data of the metal material through the grating ruler, and output the creep elongation at the specified time.

7. The measuring device for high-temperature creep of metallic materials according to claim 6, characterized in that: in In step five, an outlet groove is provided on the side wall of the high-temperature furnace. When the high-temperature furnace descends, the outlet rod extends out of the high-temperature furnace from the outlet groove.

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