A high-temperature and high-pressure hydrogen-filled material mechanical properties test device and method

Abstract

The present invention discloses a high-temperature and high-pressure hydrogen-filled material mechanical property test device and method, and relates to the technical field of material mechanical property testing. The high-temperature and high-pressure hydrogen-filled material mechanical property test device of the present invention comprises an upper fixed seat, a cylinder, an upper connecting rod, a lower connecting rod, a lock nut, a support and a cushion block, the upper fixed seat is provided with a first stepped hole, the cylinder is assembled in the first stepped hole, the upper connecting rod and the lower connecting rod are penetrated in the cylinder and used to fix the test piece, the lock nut is connected to the upper connecting rod, the support and the cushion block are sequentially sleeved on the lock nut and stopped at the upper fixed seat, the upper fixed seat is provided with a first conical surface or a first spherical surface, and the support is correspondingly provided with an adapted second conical surface or a second spherical surface. The high-temperature and high-pressure hydrogen-filled material mechanical property test device of the present invention can realize automatic centering of the upper connecting rod and the lower connecting rod when the lower connecting rod applies a load to the test piece, eliminate the bending moment attached to the test piece, and ensure the authenticity and accuracy of the test results.

Description

Technical Field

[0001] The present invention relates to the technical field of material mechanical property testing, and in particular to a high-temperature and high-pressure hydrogen-filled material mechanical property testing device and method. Background Art

[0002] Hydrogen energy is a clean and efficient energy source, and its development and utilization have attracted much attention. However, hydrogen can easily cause hydrogen embrittlement and hydrogen corrosion to materials. The selection of suitable hydrogen-resistant materials and the change of material properties in hydrogen environments are one of the key factors affecting the safety of hydrogen storage and transportation equipment. In particular, with the rise of hydrogen-blended and pure hydrogen combustion equipment, the material properties of nozzles, and the hydrogen corrosion performance of materials in the high-temperature and high-pressure environment of the steam generator heat transfer tubes of the pressure reactor in nuclear power are crucial to the safety and life of the equipment. Test performance equipment that simulates hydrogen environments under high temperature and high pressure is particularly important.

[0003] In the related technology, hydrogen environment testing equipment often uses material performance experiments in a hydrogen-filled environment, but most of them are sealing test experiments in a hydrogen environment under a single factor of pressure and temperature. When performing performance experiments on test pieces in a high-temperature and high-pressure hydrogen-filled environment, there are the following problems: 1. The higher the temperature, the lower the strength of the material, and the lower the ability to withstand pressure under high pressure. Traditional S31603 materials can generally only be used up to 450°C. At 1000°C, the allowable stress is too low and it cannot be used; 2. The higher the temperature, the more severe the hydrogen corrosion, and the faster the corrosion rate. For material performance tests under pure hydrogen and hydrogen-doped conditions, 1. In order to ensure the life of the cylinder, the test needs to solve the problem of hydrogen corrosion to the cylinder; 2. Under high temperature conditions of 1000°C, most of the seals of the materials are easy to melt and lose the sealing effect, and the pressure stability cannot be guaranteed; 3. In order to reduce the use of hydrogen, the design space of the cylinder is small, and it is difficult to use hydraulic clamps to clamp the specimens. If ordinary clamps with threaded connections are directly used, misalignment is likely to occur, and the specimens are subjected to large additional bending moments, which seriously affects the authenticity of the test results; 4. The experiment involves high pressure, high temperature heating, and hydrogen, which are extremely dangerous working conditions, and strict requirements are placed on the safety of the experimental environment. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention proposes a high-temperature and high-pressure hydrogen-filled material mechanical properties testing device, which can achieve the accuracy of the force test of the specimen under a high-temperature and high-pressure hydrogen-filled environment.

[0006] The embodiment of the present invention also provides a method for testing the mechanical properties of high-temperature and high-pressure hydrogen-filled materials.

[0007] The high temperature and high pressure hydrogen-filled material mechanical properties testing device of the embodiment of the present invention comprises:

[0008] An upper fixing seat, wherein the upper fixing seat is provided with a first stepped hole;

[0009] A cylinder, the top end of which is assembled in the first stepped hole;

[0010] An upper connecting rod, a lower connecting rod and a lock nut, wherein the upper connecting rod and the lower connecting rod are inserted into the cylinder and used to clamp and fix the test piece, and the lock nut is connected to the upper connecting rod and passes through the upper fixing seat through the first stepped hole;

[0011] A support and a cushion block, wherein the support is sleeved on the lock nut and cooperates with the lock nut, and the support is stopped at the upper fixed seat, and the cushion block is threadedly connected to the lock nut and stopped at the support;

[0012] A concave first conical surface or a first spherical surface is provided on one side of the upper fixing seat close to the support corresponding to the first stepped hole, and a matching second conical surface or a second spherical surface is provided on the support, wherein the second conical surface is used to cooperate and abut against the first conical surface, or the second spherical surface is used to cooperate and abut against the first spherical surface.

[0013] The high-temperature and high-pressure hydrogen-filled material mechanical properties testing device of the embodiment of the present invention can automatically align the upper connecting rod and the lower connecting rod through the conical surface or spherical surface between the upper fixed seat and the support when the lower connecting rod applies a load to the test piece, thereby eliminating the bending moment attached to the test piece and ensuring the authenticity and accuracy of the test results.

[0014] In some embodiments, it includes a frame body, a lower fixed seat, a pull rod, an upper head and a lower head, the frame body includes an upper frame and a lower frame arranged in parallel, the upper frame and the lower frame are respectively provided with a first hole and a second hole, the upper fixed seat is arranged at the first hole, the upper fixed seat is provided with an air inlet and an exhaust duct connected to the first step hole, the lower fixed seat is arranged at the second hole and is sealed with the lower frame, the lower fixed seat is provided with a second step hole, the cylinder is made of quartz glass, one end of the cylinder close to the upper fixed seat is provided with an air hole connected to the first step hole, the bottom end of the cylinder is assembled in the second step hole, and the top side wall and the bottom side of the cylinder are respectively sealed with the first step hole and the second step hole;

[0015] The pull rod is connected to the lower connecting rod and is used to apply load to the specimen. The upper head cover is arranged on the support and the cushion block and is sealed with the upper fixed seat. The lower head cover is arranged on the pull rod and is sealed with the lower stand. The lower head is used to seal the position where the pull rod is connected to the second hole.

[0016] In some embodiments, a gas control unit and a temperature control component are included. The gas control unit is connected to the air inlet duct and the exhaust duct. The gas control unit is used to evacuate the cylinder and to transport hydrogen or hydrogen-doped gas into the cylinder to control the gas pressure in the cylinder. The temperature control component is arranged on the frame, and the temperature control component is used to heat the medium in the cylinder and control the temperature of the heated medium.

[0017] In some embodiments, the gas control unit is provided with at least two air intake pipelines, and the two air intake pipelines are respectively connected to the hydrogen tank and the natural gas tank for conveying the natural gas mixed with hydrogen into the cylinder.

[0018] In some embodiments, the upper connecting rod and the lower connecting rod have the same size and are symmetrically arranged in the cylinder body, and the upper connecting rod and the lower connecting rod are both made of KM400 material.

[0019] In some embodiments, the upper connecting rod is provided with a first air channel extending radially and a second air channel extending axially and connected to the first air channel, and the lock nut is provided with a third air channel extending along the axis and passing through the lock nut, and the third air channel is connected to the second air channel.

[0020] In some embodiments, the gas control unit includes a pressure controller, which is connected to the upper head and is used to monitor the gas pressure in the cylinder and to perform pressure relief when the gas pressure in the cylinder exceeds a set warning value.

[0021] In some embodiments, the temperature control component includes an upper heating furnace, a middle heating furnace and a lower heating furnace. The upper heating furnace cover is arranged on the upper head, the lower heating furnace sleeve is arranged at the position where the cylinder and the lower stand are connected, the middle heating furnace is arranged on the periphery of the cylinder and is located between the upper stand and the lower heating furnace. The upper heating furnace, the middle heating furnace and the lower heating furnace are used to heat different positions of the cylinder separately.

[0022] In some embodiments, a water cooling assembly is included. The water cooling assembly is disposed below the lower frame and in contact with the tie rod. The water cooling assembly is used to cool the tie rod to improve the sealing between the tie rod and the lower head.

[0023] The high-temperature and high-pressure hydrogen-filled material mechanical property testing method of the embodiment of the present invention comprises a high-temperature and high-pressure hydrogen-filled material mechanical property testing device of any of the above embodiments;

[0024] The experimental method comprises the following steps:

[0025] S1: The specimen is clamped and fixed by the upper connecting rod and the lower connecting rod, and the connection positions at both ends of the cylinder are sealed by the upper head and the lower head;

[0026] S2: The cylinder is evacuated by the gas control unit, hydrogen-doped gas is delivered into the cylinder until the gas pressure in the cylinder reaches a first set value, and the medium in the cylinder is heated to a second set value by the temperature control component;

[0027] S3: In a hydrogen-doped environment with a set temperature and pressure, the specimen is kept in the cylinder for a set time, and a load is gradually applied to the lower connecting rod through a pull rod until the specimen breaks;

[0028] S4: Record the relevant parameters of the specimen from the time the load is applied by the load loading host to the time the specimen breaks. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the connection between the upper fixing seat and the support in the high-temperature and high-pressure hydrogen-filled material mechanical properties testing device according to an embodiment of the present invention.

[0030] Figure 2 It is a schematic diagram of the installation of the upper head and the lower head in the high-temperature and high-pressure hydrogen-filled material mechanical properties testing device according to an embodiment of the present invention.

[0031] Figure 3 It is a structural schematic diagram of a high-temperature and high-pressure hydrogen-filled material mechanical properties testing device according to an embodiment of the present invention.

[0032] Figure 4 It is a structural schematic diagram from another perspective of the high-temperature and high-pressure hydrogen-filled material mechanical properties testing device according to an embodiment of the present invention.

[0033] Reference numerals:

[0034] Upper fixed seat 1; air inlet 101; exhaust duct 102; cylinder 2; upper connecting rod 3; first air duct 301; second air duct 302; lower connecting rod 4; lock nut 5; third air duct 501; support 6; cushion block 7; frame 8; upper stand 801; lower stand 802; lower fixed seat 9; pull rod 10; upper head 11; lower head 12; gas control unit 13; pressure controller 1301; temperature control component 14; upper heating furnace 1401; middle heating furnace 1402; lower heating furnace 1403;. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0036] like Figures 1 to 4As shown, the high-temperature and high-pressure hydrogen-filled material mechanical property testing device of the embodiment of the present invention includes an upper fixed seat 1, a cylinder 2, an upper connecting rod 3, a lower connecting rod 4, a lock nut 5, a support 6 and a cushion block 7. The upper fixed seat 1 is provided with a first stepped hole, the top end of the cylinder 2 is assembled in the first stepped hole, the upper connecting rod 3 and the lower connecting rod 4 are penetrated in the cylinder 2 and are used to clamp and fix the test piece, the lock nut 5 is connected to the upper connecting rod 3 and passes through the upper fixed seat 1 through the first stepped hole, the support 6 is sleeved on the lock nut 5 and cooperates with the lock nut 5 to stop, and the support 6 is stopped on the upper fixed seat 1, the cushion block 7 is threadedly connected to the lock nut 5 and stops on the support 6, and a concave first conical surface or a first spherical surface is provided on the side of the upper fixed seat 1 close to the support 6 corresponding to the first stepped hole, and a matching second conical surface or a second spherical surface is provided on the support 6, and the second conical surface is used to cooperate and abut against the first conical surface, or the second spherical surface is used to cooperate and abut against the first spherical surface.

[0037] When the high-temperature and high-pressure hydrogen-filled material mechanical properties testing device of the embodiment of the present invention is in use, the test piece is clamped and fixed in the cylinder 2 by the upper connecting rod 3 and the lower connecting rod 4, and the lock nut 5 fixes the support 6 and the lock nut 5 together through the gasket 7. When a load is applied to the lower connecting rod 4, the support 6 will be driven to move, and the position of the support 6 will be calibrated through the second conical surface or the second spherical surface of the support 6 so that the support 6 and the upper fixed seat 1 are centered and fastened.

[0038] The high-temperature and high-pressure hydrogen-filled material mechanical properties testing device of the embodiment of the present invention can automatically align the upper connecting rod 3 and the lower connecting rod 4 through the conical surface or spherical surface between the upper fixed seat 1 and the support 6 when the lower connecting rod 4 applies a load to the test piece, thereby eliminating the bending moment attached to the test piece and ensuring the authenticity and accuracy of the test results.

[0039] In some embodiments, Figure 1 and Figure 2 As shown, it includes a frame body 8, a lower fixed seat 9, a pull rod 10, an upper head 11 and a lower head 12. The frame body 8 includes an upper stand 801 and a lower stand 802 arranged in parallel. The upper stand 801 and the lower stand 802 are respectively provided with a first hole and a second hole. The upper fixed seat 1 is arranged at the first hole. The upper fixed seat 1 is provided with an air inlet 101 and an exhaust 102 connected with the first stepped hole. The lower fixed seat 9 is arranged at the second hole and is sealed with the lower stand 802. The lower fixed seat 9 is provided with a second stepped hole. The cylinder 2 is made of quartz glass. One end of the cylinder 2 close to the upper fixed seat 1 is provided with an air hole connected with the first stepped hole. The bottom end of the cylinder 2 is assembled in the second stepped hole, and the top side wall and the bottom side of the cylinder 2 are respectively sealed with the first stepped hole and the second stepped hole.

[0040] The pull rod 10 is connected to the lower connecting rod 4 and is used to apply load to the specimen. The upper head 11 is covered on the support 6 and the cushion block 7 and is sealed with the upper fixed seat 1. The lower head 12 is sleeved on the pull rod 10 and is sealed with the lower stand 802. The lower head 12 is used to seal the position where the pull rod 10 is connected to the second hole.

[0041] The upper fixing seat 1 and the lower fixing seat 9 are respectively connected to the cylinder 2 to realize the connection between the cylinder 2 and the upper stand 801 and the lower stand 802 on the frame 8, and the upper fixing seat 1 is fixed through the first hole, and the pull rod 10 is installed through the second hole. The support 6 blocks the upper first step hole, and the air inlet 101 and the exhaust 102 on the upper fixing seat 1 are connected to the inner cavity of the cylinder 2 through the first step hole and the air hole on the cylinder 2, so as to facilitate the extraction and filling of the gas in the cylinder 2. The upper fixed seat 1 is sealed with the side wall of the cylinder 2, and the upper head 11 is covered on the support 6 and the pad 7 and is sealed with the upper fixed seat 1, the lower fixed seat 9 is sealed with the side wall of the cylinder 2, and the lower fixed seat 9 is sealed and assembled with the lower stand 802, the lower head 12 is sealed with the lower stand 802 and is sealed with the pull rod 10, the upper fixed seat 1, the upper head 11, the lower fixed seat 9, the lower head 12 and the pull rod 10 jointly realize the sealing of the cylinder 2, and ensure the sealing effect of the gas medium in the cylinder 2.

[0042] The barrel 2 is made of quartz glass, which has the characteristics of high temperature and high pressure resistance, hydrogen corrosion resistance, and low cost. When the temperature control component 14 heats the gas medium in the barrel 2, the temperature of the barrel 2 itself rises relatively low. For example, when the gas temperature inside the barrel 2 reaches 1000°C, the surface temperature at the end of the barrel 2 is only a few tens of degrees Celsius, which meets the experimental requirements of the specimen. At the same time, the heat conduction of the barrel 2 itself to other connecting parts is reduced, and the influence of high temperature on the seal is reduced, which ensures the sealing effect of the barrel 2 itself, so that the experimental environment can achieve the simulation of the hydrogen filling environment at a pressure of 3MPa and a temperature of 1000°C, and improves the maximum pressure and temperature of the experimental environment. At the same time, the barrel 2 is made of quartz glass and has a small volume, which avoids the cooling and sealing problems caused by large-scale manufacturing and high temperature and high pressure.

[0043] Optionally, an O-ring is provided between the side wall of the first stepped hole of the upper fixing seat 1 and the side wall of the cylinder 2 , and a sealing gasket is provided between the upper fixing seat 1 and the upper head 11 .

[0044] Optionally, an O-ring is provided between the side wall of the second stepped hole of the lower fixing seat 9 and the cylinder 2 , and a sealing gasket is provided between the lower fixing seat 9 and the lower stand 802 .

[0045] Optionally, a sealing gasket is provided between the lower head 12 and the lower stand 802 , and an O-ring is provided between the lower head 12 and the pull rod 10 .

[0046] Optionally, the lower fixing seat 9 and the lower stand 802 are fastened with bolts.

[0047] Optionally, an upper chuck and a lower chuck are provided on the cylinder 2, the upper chuck is connected to the upper fixing frame by bolts, and an O-ring mounted on the cylinder 2 is provided between the upper chuck and the upper fixing frame, the lower chuck is connected to the lower fixing frame by bolts, and an O-ring mounted on the cylinder 2 is provided between the lower chuck and the lower fixing frame, the fixation of the cylinder 2 is ensured by the upper chuck and the lower chuck, and the sealing of the peripheral connection position of the cylinder 2 is increased.

[0048] Optionally, a load loading host is included, the load loading host is arranged on the frame 8, and the output shaft of the load loading host is the pull rod 10. The load loading host is driven by a servo motor, and the servo motor and the reducer are transmitted to the moving ball screw through a toothed belt to realize the rise and fall of the pull rod 10, which has the characteristics of high transmission efficiency and stable test loading. In order to improve the displacement measurement accuracy, a contact extensometer is used to directly press on the sample clamp ring to measure the displacement change value of the sample.

[0049] Optionally, the load range of the load loading host is 0 to 50 kN.

[0050] In some embodiments, Figure 3 and Figure 4 As shown, it includes a gas control unit 13 and a temperature control component 14. The gas control unit 13 is connected to the air inlet 101 and the exhaust duct 102. The gas control unit 13 is used to evacuate the cylinder 2 and to transport hydrogen or hydrogen-doped gas into the cylinder 2 to control the gas pressure in the cylinder 2. The temperature control component 14 is arranged on the frame 8. The temperature control component 14 is used to heat the medium in the cylinder 2 and control the temperature of the heated medium.

[0051] The gas control unit 13 and the temperature control assembly 14 ensure the control of the gas pressure and temperature in the cylinder 2, so as to accurately simulate the use environment of the test piece and reduce the error in the experimental process.

[0052] Optionally, the gas control unit 13 includes an air pump and a gas tank connected to the air pump, and the air pump is used to evacuate the cylinder 2 and to transport gas into the cylinder 2.

[0053] In some embodiments, the gas control unit 13 is provided with at least two air intake pipelines, and the two air intake pipelines are respectively connected to the hydrogen tank and the natural gas tank for conveying the natural gas mixed with hydrogen into the cylinder 2 .

[0054] The gas control unit 13 is provided with at least two air inlet pipelines, ensuring that hydrogen and natural gas can be extracted simultaneously, so as to create a mixed gas environment of natural gas and hydrogen in the cylinder 2, increase the selectable variables of the experimental environment, and facilitate obtaining more accurate data for the mechanical properties test of the material.

[0055] In some embodiments, Figure 1 and Figure 2 As shown, the upper connecting rod 3 and the lower connecting rod 4 have the same size and are symmetrically arranged in the cylinder 2, and both the upper connecting rod 3 and the lower connecting rod 4 are made of KM400 material.

[0056] The upper connecting rod 3 and the lower connecting rod 4 are set to have the same size and are symmetrically arranged up and down, so as to eliminate the pressure on the specimen caused by the internal pressure of the gas when the upper connecting rod 3 and the lower connecting rod 4 apply a load to the specimen in the cylinder 2, reduce experimental interference, and ensure the accuracy of the experimental data obtained. At the same time, the upper connecting rod 3 and the lower connecting rod 4 are made of KM400 material, which has the characteristics of resistance to high temperature, high pressure and hydrogen corrosion, thereby ensuring the normal use of the upper connecting rod 3 and the lower connecting rod 4 in a high temperature and high pressure environment, thereby ensuring the effective implementation of the mechanical property test of the specimen.

[0057] In some embodiments, Figure 1 and Figure 2 As shown, the upper connecting rod 3 is provided with a first air channel 301 extending radially and a second air channel 302 extending axially and connected to the first air channel 301 , and the lock nut 5 is provided with a third air channel 501 extending along the axis and passing through the lock nut 5 , and the third air channel 501 is connected to the second air channel 302 .

[0058] The first air channel 301 and the second air channel 302 are connected and connected between the inside of the cylinder 2 and the inner side of the upper head 11 through the third air channel 501, so that the support 6 and the lock nut 5 are in the experimental environment, reducing the influence of the air pressure in the cylinder 2 on the support 6 and the lock nut 5 when the pull rod 10 is loaded, thereby ensuring the accuracy of the experiment.

[0059] In some embodiments, the lower connecting rod 4 is provided with a fourth air channel extending radially and a fifth air channel extending axially and connected to the fourth air channel, so as to ensure the structural symmetry between the lower connecting rod 4 and the upper connecting rod 3 and reduce the influence of the gas in the cylinder 2 on the lower connecting rod 4 when load is applied.

[0060] In some embodiments, Figure 3 As shown, the gas control unit 13 includes a pressure controller 1301, which is connected to the upper head 11. The pressure controller 1301 is used to monitor the gas pressure in the cylinder 2 and to perform pressure relief when the gas pressure in the cylinder 2 exceeds a set warning value.

[0061] By setting up a pressure controller 1301, the pressure controller 1301 is connected with the upper head 11 to detect the gas pressure in the cylinder 2, ensuring that the gas pressure in the cylinder 2 meets the experimental requirements during the experiment, and can ensure that the gas pressure in the cylinder 2 is within the safe experimental range by timely pressure relief, thereby improving the safety of the experiment.

[0062] In some embodiments, the temperature control component 14 includes an upper heating furnace 1401, a middle heating furnace 1402 and a lower heating furnace 1403. The upper heating furnace 1401 is covered on the upper head 11, and the lower heating furnace 1403 is sleeved at the position where the cylinder 2 is connected to the lower stand 802. The middle heating furnace 1402 is arranged on the side of the cylinder 2 and is located between the upper stand 801 and the lower heating furnace 1403. The upper heating furnace 1401, the middle heating furnace 1402 and the lower heating furnace 1403 are used to heat different positions of the cylinder 2 separately.

[0063] The upper head 11, the middle of the cylinder 2 and the bottom of the cylinder 2 are heated respectively by the upper heating furnace 1401, the middle heating furnace 1402 and the lower heating furnace 1403, and different heating powers are set at the three positions to meet the heat resistance of the components at different positions to ensure the safety of the experiment. At the same time, it is convenient to keep the gas temperature in the cylinder 2 warm, so as to create a use environment for the test piece in the cylinder 2.

[0064] Optionally, the upper heating furnace 1401, the middle heating furnace 1402 and the lower heating furnace 1403 heat the gas medium by thermal radiation.

[0065] In some embodiments, a water cooling assembly is included. The water cooling assembly is disposed below the lower stand 802 and in contact with the tie rod 10 . The water cooling assembly is used to cool the tie rod 10 to improve the sealing between the tie rod 10 and the lower head 12 .

[0066] The pull rod 10 is connected to the lower connecting rod 4. During use, the pull rod 10 has a certain amount of heat due to the heat transfer from the lower connecting rod 4. Heat exchange is performed with the pull rod 10 through the water cooling component, which facilitates cooling of the pull rod 10 and avoids the heat conduction of the pull rod 10 to the outside, which affects the sealing of the lower head 12, thereby ensuring the creation of an experimental environment for the specimen.

[0067] Optionally, the water cooling assembly includes a water cooler and a circulation device, wherein the circulation device includes a spiral section, and the spiral section is wound around the pull rod 10 and is used for exchanging heat with the pull rod 10 .

[0068] The high-temperature and high-pressure hydrogen-filled material mechanical property testing device of the embodiment of the present invention can realize the mechanical property testing of materials in a hydrogen-doped environment at a high temperature of 1000°C and a gas pressure of 3MPa, providing technical support for the material selection of key equipment such as hydrogen-doped combustion nozzles and nuclear power steam heat transfer tubes. At the same time, by providing relevant mechanical property parameters of alloy materials in a high-temperature and high-pressure hydrogen environment, such as yield point, tensile strength, elongation, and area reduction, the changes of various mechanical properties in different hydrogen environments are studied, laying a data foundation for studying the hydrogen embrittlement and hydrogen corrosion mechanism of alloys under hydrogen.

[0069] The following describes a method for testing the mechanical properties of high-temperature and high-pressure hydrogen-filled materials according to an embodiment of the present invention.

[0070] The high-temperature and high-pressure hydrogen-filled material mechanical property testing method of the embodiment of the present invention comprises a high-temperature and high-pressure hydrogen-filled material mechanical property testing device of any of the above embodiments;

[0071] The experimental method includes the following steps:

[0072] S1: The test piece is clamped and fixed by the upper connecting rod 3 and the lower connecting rod 4, and the connection positions at both ends of the cylinder 2 are sealed by the upper head 11 and the lower head 12;

[0073] S2: The gas control unit 13 is used to evacuate the cylinder 2, exhaust the air in the cylinder 2, and deliver hydrogen-doped gas into the cylinder 2 until the gas pressure in the cylinder 2 reaches a first set value, such as any pressure value in the range of 1.01 MPa to 3 MPa, and the temperature control component 14 is used to heat the medium in the cylinder 2 to a second set value, such as any pressure value in the range of room temperature to 1000° C.;

[0074] S3: After the specimen is kept in the hydrogen-doped environment at the set temperature and pressure for a set time, a load is gradually applied to the lower connecting rod 4 through the pull rod 10 until the specimen breaks;

[0075] S4: Record the relevant parameters of the specimen from the time the load is applied by the load loading host to the time the specimen breaks.

[0076] The high-temperature and high-pressure hydrogen-filled material mechanical properties testing method of the embodiment of the present invention is easy to operate, can ensure the hydrogen corrosion simulation of the specimen in a hydrogen-doped environment of 3MPa and 1000°C, and measure the mechanical properties of the specimen after hydrogen corrosion, thereby ensuring the accuracy and precision of the measurement.

[0077] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0078] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0079] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0080] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0081] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0082] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A high temperature and high pressure hydrogen-filled material mechanical properties testing device, characterized in that: include: An upper fixing seat, wherein the upper fixing seat is provided with a first stepped hole; A cylinder, the top end of which is assembled in the first stepped hole; An upper connecting rod, a lower connecting rod and a lock nut, wherein the upper connecting rod and the lower connecting rod are inserted into the cylinder and used to clamp and fix the test piece, and the lock nut is connected to the upper connecting rod and passes through the upper fixing seat through the first stepped hole; A support and a cushion block, wherein the support is sleeved on the lock nut and cooperates with the lock nut, and the support is stopped at the upper fixed seat, and the cushion block is threadedly connected to the lock nut and stopped at the support; A concave first conical surface or a first spherical surface is provided on one side of the upper fixing seat close to the support corresponding to the first stepped hole, and a matching second conical surface or a second spherical surface is provided on the support correspondingly, the second conical surface is used to cooperate with and abut against the first conical surface, or the second spherical surface is used to cooperate with and abut against the first spherical surface; It includes a frame, a lower fixed seat, a pull rod, an upper head and a lower head, the frame includes an upper frame and a lower frame arranged in parallel, the upper frame and the lower frame are respectively provided with a first hole and a second hole, the upper fixed seat is arranged at the first hole, the upper fixed seat is provided with an inlet duct and an exhaust duct connected with the first stepped hole, the lower fixed seat is arranged at the second hole and is sealed with the lower frame, and the lower fixed seat is provided with a second stepped hole; It comprises a gas control unit and a temperature control component, wherein the gas control unit is connected with the air inlet and the exhaust duct, the gas control unit is used to evacuate the cylinder and to transport hydrogen or hydrogen-doped gas into the cylinder to control the gas pressure in the cylinder, and the temperature control component is arranged on the frame, and the temperature control component is used to heat the medium in the cylinder and control the temperature of the heated medium; The upper connecting rod is provided with a first air channel extending in the radial direction and a second air channel extending in the axial direction and connected with the first air channel. The lock nut is provided with a third air channel extending along the axis and passing through the lock nut, and the third air channel is connected with the second air channel. The support and the lock nut are in an experimental environment. The lower connecting rod is provided with a fourth air channel extending in the radial direction and a fifth air channel extending in the axial direction and connected with the fourth air channel, thereby ensuring the structural symmetry of the lower connecting rod and the upper connecting rod.

2. The high temperature and high pressure hydrogen-filled material mechanical properties testing device according to claim 1, characterized in that: The cylinder is made of quartz glass, and one end of the cylinder close to the upper fixing seat is provided with an air hole connected to the first stepped hole, the bottom end of the cylinder is assembled in the second stepped hole, and the top side wall and the bottom side of the cylinder are respectively sealed with the first stepped hole and the second stepped hole; The pull rod is connected to the lower connecting rod and is used to apply load to the specimen. The upper head cover is arranged on the support and the cushion block and is sealed with the upper fixed seat. The lower head cover is arranged on the pull rod and is sealed with the lower stand. The lower head is used to seal the position where the pull rod is connected to the second hole.

3. The high temperature and high pressure hydrogen-filled material mechanical properties testing device according to claim 2, characterized in that: The gas control unit is provided with at least two air intake pipelines, and the two air intake pipelines are respectively connected to the hydrogen tank and the natural gas tank to transport the natural gas mixed with hydrogen into the cylinder.

4. The high temperature and high pressure hydrogen-filled material mechanical properties testing device according to claim 2, characterized in that: The upper connecting rod and the lower connecting rod have the same size and are symmetrically arranged up and down in the cylinder. The upper connecting rod and the lower connecting rod are both made of KM400 material.

5. The high temperature and high pressure hydrogen-filled material mechanical properties testing device according to claim 1, characterized in that: The gas control unit includes a pressure controller, which is connected to the upper head. The pressure controller is used to monitor the gas pressure in the cylinder and to perform pressure relief when the gas pressure in the cylinder exceeds a set warning value.

6. The high temperature and high pressure hydrogen-filled material mechanical properties testing device according to claim 2, characterized in that: The temperature control component includes an upper heating furnace, a middle heating furnace and a lower heating furnace. The upper heating furnace cover is arranged on the upper head, the lower heating furnace sleeve is arranged at the position where the cylinder and the lower stand are connected, the middle heating furnace is arranged on the periphery of the cylinder and is located between the upper stand and the lower heating furnace. The upper heating furnace, the middle heating furnace and the lower heating furnace are used to heat different positions of the cylinder separately.

7. The high temperature and high pressure hydrogen-filled material mechanical properties testing device according to claim 6, characterized in that: It comprises a water cooling component, which is arranged below the lower frame and contacts the pull rod, and is used for cooling the pull rod to improve the sealing performance between the pull rod and the lower head.

8. A method for testing the mechanical properties of high-temperature and high-pressure hydrogen-filled materials, characterized in that: A high-temperature and high-pressure hydrogen-charged material mechanical properties testing device comprising any one of claims 2 to 7; The test method comprises the following steps: S1: The specimen is clamped and fixed by the upper connecting rod and the lower connecting rod, and the connection positions at both ends of the cylinder are sealed by the upper head and the lower head; S2: The cylinder is evacuated by the gas control unit, hydrogen-doped gas is delivered into the cylinder until the gas pressure in the cylinder reaches a first set value, and the medium in the cylinder is heated to a second set value by the temperature control component; S3: In a hydrogen-doped environment with a set temperature and pressure, the specimen is kept in the cylinder for a set time, and a load is gradually applied to the lower connecting rod through a pull rod until the specimen breaks; S4: Record the relevant parameters of the specimen from the time the load is applied by the load loading host to the time the specimen breaks.

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