Temperature hydrogen environment torque multi-field coupling mechanical test device and test method

Abstract

The invention relates to the technical field of hydrogen embrittlement mechanical property testing devices, in particular to a temperature hydrogen environment torque multi-field coupling mechanical testing device and a testing method.The device comprises a workbench and further comprises an environment box, an upper clamping head and a lower clamping head; the upper clamping head and the lower clamping head are oppositely arranged in the environment box and are respectively used for clamping two ends of a sample, a sodium hydroxide solution is filled in the environment box, the sample is immersed in the environment box, a platinum electrode in contact with the sodium hydroxide solution is mounted on the environment box, the platinum electrode is connected with an anode, the sample is connected with a cathode, and the cathode is connected with the anode. A first driving mechanism used for driving the upper clamping head to rotate is arranged on the workbench, the temperature of an experimental environment can be adjusted, in-situ electrochemical hydrogen charging can be performed, and a torsion load can be applied, so that comprehensive testing of torsion mechanical behaviors, hydrogen embrittlement and a failure mode of a metal material in a temperature and hydrogen complex environment can be realized; and the cyclic torsion test can be carried out under the coupling action of the temperature and the hydrogen embrittlement multi-physics field.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen embrittlement mechanical property testing devices, and in particular to a temperature hydrogen environment torque multi-field coupling mechanical testing device and a testing method. Background Art

[0002] In the study of material mechanics and corrosion, hydrogen embrittlement, failure modes and fatigue behavior are issues that need to be focused on in practical applications of metal materials, especially high-strength alloys. In order to simulate the torsional mechanical behavior and hydrogen embrittlement of materials in a hydrogen environment, researchers usually use a combination of electrochemical hydrogen charging and mechanical testing. However, existing testing equipment can usually only control temperature, electrochemical hydrogen charging or mechanical loading alone, and lacks the testing capability of multi-physical field coupling. This makes it impossible to fully evaluate the interaction of complex behaviors such as hydrogen embrittlement and failure modes during the test, limiting the depth and breadth of research on hydrogen embrittlement mechanical properties. At present, there are some devices that can perform electrochemical hydrogen charging experiments, but these devices usually cannot achieve temperature regulation at the same time during the hydrogen charging process, or there is a lack of effective linkage between the temperature control system and the electrochemical workstation. In addition, the existing hydrogen embrittlement mechanical properties test device can only consider tensile loads, and cannot study the hydrogen embrittlement characteristics under cyclic torsion loads, and most of the equipment cannot be combined with electrochemical hydrogen charging and temperature control systems, resulting in the inability to achieve the simultaneous application of hydrogen environment, temperature and torsion loads. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in order to solve the problem that the existing test equipment can usually only control temperature, electrochemical hydrogen charging or mechanical loading separately, and lacks the test capability of multi-physical field coupling. This leads to the inability to fully evaluate the interaction of complex behaviors such as hydrogen embrittlement and failure mode during the test process, limiting the depth and breadth of the research on hydrogen embrittlement mechanical properties. A mechanical test device and test method for multi-field coupling of temperature hydrogen environment torque are provided.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a mechanical testing device with temperature hydrogen environment torque multi-field coupling, including a workbench, an environmental box, an upper clamping head and a lower clamping head, the upper clamping head and the lower clamping head are arranged oppositely in the environmental box and are respectively used to clamp the two ends of the sample, the environmental box is equipped with a sodium hydroxide solution and the sample is immersed in it, a platinum electrode in contact with the sodium hydroxide solution is installed on the environmental box, the platinum electrode is connected to the anode, and the sample is connected to the cathode, the workbench is provided with a first driving mechanism for driving the upper clamping head to rotate, the environmental box is provided with a temperature control mechanism, and the environmental box is provided with a camera for monitoring changes in the sample. Compared with the existing technology, this scheme can adjust the temperature of the experimental environment, perform in-situ electrochemical hydrogen charging, and apply torsional loads, thereby realizing comprehensive testing of the torsional mechanical behavior, hydrogen embrittlement and failure modes of metal materials in a complex environment of temperature and hydrogen. It can accurately control the temperature and hydrogen embrittlement multi-physical field coupling to carry out cyclic torsion tests, providing a new experimental platform for studying the hydrogen embrittlement of metal materials under torsional loads, and can be applied to the field of hydrogen embrittlement mechanics research of metal materials and the development of new hydrogen-resistant materials.

[0005] In order to realize the temperature control mechanism, some embodiments are preferred, wherein the temperature control mechanism includes a heating plate, and the heating plate is fixedly mounted on the outer peripheral surface of the environmental box. By fixing the heating plate on the environmental box, the environmental box is heated to realize the control of the test temperature in the environmental box to meet the test requirements.

[0006] In order to ensure stable and reliable temperature control of the environmental box, in some preferred embodiments, the temperature control mechanism further includes an insulation box, the environmental box is arranged in the insulation box, the insulation box includes a left half box and a right half box, one side of the left half box and the right half box are hinged to each other, and the other side of the left half box and the right half box are provided with mutually matched locking structures. An insulation box is arranged outside the environmental box to insulate the environmental box, prevent the temperature of the environmental box from losing, and ensure stable and reliable temperature control of the environmental box.

[0007] In some preferred embodiments, the heating plates are provided with a plurality of them, and the plurality of the heating plates are all connected to a temperature controller. The temperature controller not only supports real-time adjustment and monitoring of temperature, but also can provide a stable temperature control environment under different experimental conditions, ensuring that the influence of temperature on the mechanical behavior of the material is accurately simulated. Under the coupling effect of electrochemical hydrogen charging and torsional loading, the temperature control system can prevent the interference of temperature fluctuations on the experimental results, ensuring the accuracy and repeatability of the experimental data.

[0008] In order to facilitate the clamping of samples of different sizes, in some preferred embodiments, the workbench is provided with a second driving mechanism for controlling the lower clamping head to approach or move away from the upper clamping head. The second driving mechanism controls the displacement of the lower clamping head and drives the lower clamping head to approach or move away from the upper clamping head, controls the distance between the upper clamping head and the lower clamping head, and meets the requirements of clamping samples of different sizes.

[0009] In order to realize the second driving mechanism, in some preferred embodiments, the second driving mechanism is a telescopic cylinder.

[0010] In order to realize hydrogen charging by electrochemical reaction, and precisely control the current density and the rate of hydrogen charging process, hydrogen can gradually penetrate and diffuse into the metal sample, thereby inducing hydrogen embrittlement, and facilitating the sample, preferably in some embodiments, the anode and cathode are connected to an electrochemical workstation. The electrochemical workstation can adjust the anode and cathode currents to realize the hydrogen charging function, so that it can explore the influence of hydrogen concentration and hydrogen charging rate on the mechanical properties of the material under different experimental conditions.

[0011] In order to better understand the test of the sample, in some preferred embodiments, the camera is connected to an external display screen.

[0012] In order to facilitate the collection of test data, some embodiments are preferably used, wherein the first drive mechanism and the external display screen are respectively connected to the external experimental controller, and the external experimental controller is used for analyzing, monitoring and image acquisition of the sample data. The torsion loading of the sample is realized by the precise torque loading of the first drive mechanism, and the magnitude of the applied torque and the loading rate can be controlled, so as to study the mechanical response of the sample under different torque loads and its hydrogen embrittlement behavior. The first drive mechanism works closely with the electrochemical hydrogen charging system and the temperature control system to ensure that the sample can withstand constant or cyclic torsion loads under set temperature conditions in a hydrogen environment. The camera acquisition is used to monitor the crack initiation and failure process on the surface of the sample in real time. The system uses a high-definition camera and image processing software to accurately capture the surface deformation, crack initiation and expansion of the sample under torsion loading and hydrogen environment. The camera can record the evolution of cracks on the surface of the sample at a high frequency, provide real-time image data, and help researchers observe the initial formation of cracks, expansion paths and final fracture processes, which not only enhances the reliability of the test data, but also provides a key experimental basis for understanding the damage mechanism of hydrogen to metal materials.

[0013] A test method using a temperature hydrogen environment torque multi-field coupling mechanical test device as described above, the specific operating steps are as follows:

[0014] S1. The torque value of the upper clamping head is set by an external experimental controller according to the experimental requirements;

[0015] S2. Place the sample between the upper clamping head and the lower clamping head and clamp the sample;

[0016] S3. Pour sodium hydroxide solution into the environmental chamber and immerse the sample in it;

[0017] S4, the temperature control mechanism controls the required temperature in the environmental chamber;

[0018] S5. Connect the cathode to the sample and the anode to the platinum electrode, and allow hydrogen to gradually penetrate into the sample;

[0019] S6, applying a required torque value to the sample through the first driving mechanism, and observing through a camera;

[0020] S7. Monitor, analyze and collect test data of the sample through an external experimental controller.

[0021] The beneficial effects of the present invention are as follows: the mechanical test device and test method of the temperature hydrogen environment torque multi-field coupling of the present invention can adjust the temperature of the experimental environment, in-situ electrochemical hydrogenation, and apply torsional load when in use, so as to achieve a comprehensive test of the torsional mechanical behavior, hydrogen embrittlement and failure mode of metal materials in a complex environment of temperature and hydrogen, and can accurately control the temperature and hydrogen embrittlement multi-physical field coupling to carry out cyclic torsion tests, providing a new experimental platform for studying the hydrogen embrittlement of metal materials under torsional loads, which can be applied to the field of hydrogen embrittlement mechanics research of metal materials and the development of new hydrogen-resistant materials, and integrating the four core functions of temperature control, electrochemical in-situ hydrogenation, torsional loading and crack monitoring and image acquisition system, to construct a multi-physical field coupling experimental platform. The electrochemical in-situ hydrogenation system simulates the corrosive effect of hydrogen on metal materials under actual working conditions by accurately adjusting the current density and the hydrogenation process rate, avoiding the existing test equipment that can usually only control temperature, electrochemical hydrogenation or mechanical loading separately, and lacks the test capability of multi-physical field coupling. This results in the inability to fully evaluate the interactions of complex behaviors such as hydrogen embrittlement and failure modes during the test process, limiting the depth and breadth of research on hydrogen embrittlement mechanical properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1 The structure of the present invention is schematically shown in FIG. Figure 1 ;

[0024] Figure 2 The structure of the present invention is schematically shown in FIG. Figure 2 ;

[0025] Figure 3 It is a test flow chart of the present invention.

[0026] In the figure: 1. temperature controller, 2. electrochemical workstation, 3. first driving mechanism, 4. insulation box, 5. locking structure, 6. external display screen, 7. external experiment controller, 8. platinum electrode, 9. upper linkage transmission shaft, 10. environmental chamber, 11. upper clamping head, 12. heating plate, 13. sample, 14. camera, 15. lower clamping head, 16. lower linkage transmission shaft. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with embodiments:

[0028] The present invention is not limited to the following specific embodiments. A person skilled in the art can implement the present invention in various other specific embodiments according to the contents disclosed in the present invention, or any simple changes or modifications made to the design structure and ideas of the present invention fall within the protection scope of the present invention. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0031] like Figure 1-2As shown, a temperature hydrogen environment torque multi-field coupling mechanical testing device includes a workbench, an environmental box 10 is fixedly installed on the workbench, an upper clamping head 11 is arranged above the environmental box 10, and a lower clamping head 15 is arranged below the environmental box 10. The upper clamping head 11 and the lower clamping head 15 are arranged opposite to each other and are respectively used to clamp the two ends of the sample 13. A sodium hydroxide solution is installed in the environmental box 10 and the sample 13 is immersed in it. A platinum electrode 8 in contact with the sodium hydroxide solution is installed on the environmental box 10, the platinum electrode 8 is connected to the anode, and the sample 13 is connected to the cathode. A first driving mechanism 3 for driving the upper clamping head 11 to rotate is arranged on the workbench, the first driving mechanism 3 is fixedly installed on the workbench, the first driving mechanism 3 is located above the environmental box 10, and the first driving mechanism 3 is connected to the upper clamping head 11 through an upper linkage transmission shaft 9. A temperature control mechanism is arranged on the environmental box 10, and a camera 14 for monitoring changes in the sample 13 is arranged on the environmental box 10.

[0032] The temperature control mechanism includes a heating plate 12 and an insulation box 4. The heating plate 12 is fixedly installed on the outer peripheral surface of the environmental box 10. There are three heating plates 12 on the outer periphery of the environmental box 10 at axial intervals. The environmental box 10 is arranged in the insulation box 4. The insulation box 4 includes a left half box and a right half box. One side of the left half box and the right half box are hinged to each other, and the other side of the left half box and the right half box are provided with a locking structure 5 that cooperates with each other. The three heating plates 12 are all connected to the temperature controller 1.

[0033] A second driving mechanism is provided on the workbench, and the second driving mechanism is used to control the lower clamping head 15 to approach or move away from the upper clamping head 11 . The second driving mechanism is a telescopic cylinder, and the second driving mechanism is connected to the lower clamping head 16 through a lower linkage transmission shaft 16 .

[0034] The anode and cathode are connected to an electrochemical workstation 2, the camera 14 is connected to an external display screen 6, the first driving mechanism 3 and the external display screen 6 are respectively connected to an external experiment controller 7, and the external experiment controller 7 is used for analyzing, monitoring and image acquisition of the sample 13 data.

[0035] The device can accurately test the cyclic torsional performance of materials in hydrogen environments at different temperatures in the same integrated test device through a temperature control mechanism, an electrochemical workstation 2, a second driving mechanism and a camera 14. The temperature control mechanism can accurately adjust the temperature during the test to ensure temperature stability. The electrochemical workstation 2 realizes in-situ hydrogen charging of the sample 13 through an electrolyte and an electrode, and controls the charging process of the electrochemical hydrogen charging in combination with an electrochemical hydrogen charging current. The second driving mechanism applies a cyclic torsional force to simulate the hydrogen embrittlement mechanical behavior of the sample 13 under different cyclic loads. The camera 14 collects the crack initiation and failure process on the surface of the sample 13, thereby realizing a comprehensive test of the torsional mechanical behavior, hydrogen embrittlement and failure mode of the metal material sample 13 at the required test temperature and in a complex hydrogen environment, and can accurately control the hydrogen concentration and permeation rate during the experiment, providing a highly controllable and multi-physical field hydrogen embrittlement torsional mechanics experimental platform for in-depth research on the torsional mechanical properties, failure mode behavior and hydrogen embrittlement mechanism of metal materials in a hydrogen environment.

[0036] Example 2

[0037] Example 2 is a test method using the test device in Example 1, specifically: Figure 3 As shown, a test method using a temperature hydrogen environment torque multi-field coupling mechanical test device as described above, the specific operation steps are as follows:

[0038] S1. The external experimental controller 7 sets the torque value of the upper clamping head 11 according to the experimental requirements;

[0039] S2, the sample 13 is first placed in the lower clamping head 15 and one end of the sample 13 is fixed, then the second driving mechanism is used to ensure that the sample 13 is in the center of the environmental chamber 10, and then the other end of the sample 13 is placed in the upper clamping head 11 and clamped, thus completing the clamping of the sample 13;

[0040] S3, pouring sodium hydroxide solution into the environmental chamber 10 and immersing the sample 13 therein;

[0041] S4. The temperature controller 1 is responsible for accurately measuring the temperature of the sample 13 during the test. For example, the temperature can be adjusted to be constant at 25°C or 50°C during the entire test process to ensure that the sample 13 operates stably within the set temperature range. By adding a display screen to display temperature changes in real time, the user can intuitively monitor the temperature. At the same time, the power output of each heating plate 12 is accurately adjusted by adjusting the button to control the working state of the heating plate 12, thereby achieving heating and temperature control of the sample 13. The reasonable layout and adjustment function of the heating plate 12 ensure uniform temperature distribution, avoid local overheating or interference from temperature fluctuations, and ensure the accuracy of the experimental results. The incubator 4, as an important component of the temperature control mechanism, surrounds the entire test area, maintains a stable temperature control environment, and effectively prevents the influence of external temperature fluctuations. The temperature in the incubator 4 is accurately adjusted by the heating plate 12 to ensure that the sample 13 is always under the required temperature conditions during the experiment.

[0042] S5. The electrochemical workstation 2 is electrically connected to the power supply. The user can select an appropriate current through the parameter selection button and accurately adjust the current value through the parameter adjustment button. At the same time, the current change is monitored in real time through the display screen of the electrochemical workstation 2 to ensure accurate adjustment of the hydrogen generation process. The electrochemical workstation 2 not only controls the current and voltage output by the power supply, but also continuously monitors the reaction process to ensure the stability of the experimental conditions. In the electrochemical reaction, the sample 13 is immersed in an environmental box 10 filled with sodium hydroxide solution. Hydrogen is generated on the surface of the sample 13 through the cathode, and oxygen is released at the platinum electrode 8. The hydrogen generation process is achieved through the cathode effect in the electrolysis reaction. Hydrogen ions are reduced to hydrogen and penetrate into the interior of the metal sample 13, thereby realizing in-situ hydrogen charging. The entire hydrogen charging process is controlled by accurately adjusting the current to ensure that the sample 13 is always in a controllable and stable hydrogen environment. This mechanism provides ideal experimental conditions for hydrogen embrittlement performance evaluation, can accurately simulate the hydrogen embrittlement behavior of materials in a hydrogen environment, and provide accurate and reliable data support for hydrogen embrittlement evaluation;

[0043] S6, the first driving mechanism 3 is used to apply a torsional force, that is, the required torque is applied by the torsional driving motor at the first driving mechanism 3 to simulate the mechanical behavior of the material under actual working conditions. After the sample 13 is clamped, the first driving mechanism 3 is controlled by the computer terminal of the testing machine to start the torsional loading process. The entire clamping and loading process is precisely controlled to ensure that the sample 13 is stably stressed during the experiment, thereby effectively simulating the mechanical response and failure behavior of the material under hydrogen environment and temperature change conditions;

[0044] S7, the external experiment controller 7 monitors the crack initiation and failure on the surface of the sample 13 in real time through the camera 14, and captures the surface deformation, crack initiation and expansion process of the sample 13 under torsion loading and hydrogen environment. The camera 14 has high-definition image acquisition capabilities, and can record the evolution of cracks on the surface of the sample 13 at a high frequency, providing accurate image data. The camera 14 display screen is used to display the monitored image information in real time, helping researchers to intuitively observe the initial formation, expansion path and final fracture process of the crack. The image processing software can accurately analyze the evolution of the crack, record and store the image data of all key moments in the experiment, which not only improves the reliability and accuracy of the experimental data, but also provides a crucial experimental basis for studying the crack initiation and failure behavior of metal materials in a hydrogen environment and the hydrogen embrittlement mechanism.

[0045] The above-mentioned ideal embodiments of the present invention are for inspiration. Through the above-mentioned description, relevant staff can make various changes and modifications without departing from the technical idea of ​​the present invention. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A temperature hydrogen environment torque multi-field coupling mechanical testing device, comprising a workbench, characterized in that: The invention also comprises an environmental box (10), an upper clamping head (11) and a lower clamping head (15), wherein the upper clamping head (11) and the lower clamping head (15) are arranged opposite to each other in the environmental box (10) and are respectively used to clamp the two ends of the sample (13), wherein the environmental box (10) is filled with a sodium hydroxide solution and the sample (13) is immersed therein, wherein a platinum electrode (8) in contact with the sodium hydroxide solution is installed on the environmental box (10), wherein the platinum electrode (8) is connected to the anode and the sample (13) is connected to the cathode, wherein a first driving mechanism (3) for driving the upper clamping head (11) to rotate is arranged on the workbench, wherein a temperature control mechanism is arranged on the environmental box (10), and wherein a camera (14) for monitoring changes of the sample (13) is arranged on the environmental box (10).

2. A temperature hydrogen environment torque multi-field coupling mechanical testing device according to claim 1, characterized in that: The temperature control mechanism comprises a heating plate (12), and the heating plate (12) is fixedly mounted on the outer peripheral surface of the environmental box (10).

3. The temperature hydrogen environment torque multi-field coupling mechanical testing device according to claim 2 is characterized by: The temperature control mechanism also includes an insulation box (4), the environmental box (10) is arranged in the insulation box (4), and the insulation box (4) includes a left half box and a right half box, one side of the left half box and the right half box are hinged to each other, and the other side of the left half box and the right half box are provided with a locking structure (5) that cooperates with each other.

4. The temperature hydrogen environment torque multi-field coupling mechanical testing device according to claim 3 is characterized by: A plurality of the heating plates (12) are provided, and each of the plurality of heating plates (12) is connected to a temperature controller (1).

5. The temperature hydrogen environment torque multi-field coupling mechanical testing device according to claim 1 is characterized by: The workbench is provided with a second driving mechanism for controlling the lower clamping head (15) to move closer to or farther away from the upper clamping head (11).

6. The temperature hydrogen environment torque multi-field coupling mechanical testing device according to claim 5 is characterized by: The second driving mechanism is a telescopic cylinder.

7. The temperature hydrogen environment torque multi-field coupling mechanical testing device according to claim 1 is characterized by: The anode and cathode are connected to an electrochemical workstation (2).

8. The temperature hydrogen environment torque multi-field coupling mechanical testing device according to claim 1 is characterized by: The camera (14) is connected to the external display screen (6).

9. The temperature hydrogen environment torque multi-field coupling mechanical testing device according to claim 8, characterized in that: The first driving mechanism (3) and the external display screen (6) are respectively connected to an external experiment controller (7), and the external experiment controller (7) is used for analyzing, monitoring and image acquisition of sample (13) data.

10. A testing method using a temperature hydrogen environment torque multi-field coupling mechanical testing device as claimed in any one of claims 1 to 9, characterized in that: The specific steps are as follows: S1. The torque value of the upper clamping head (11) is set by an external experimental controller (7) according to experimental requirements; S2, placing the sample (13) between the upper clamping head (11) and the lower clamping head (15) and clamping the sample (28); S3, pouring sodium hydroxide solution into the environmental chamber (10) and immersing the sample (13) therein; S4, the temperature control mechanism controls the required temperature in the environmental box (10); S5, connecting the cathode to the sample (13), connecting the anode to the platinum electrode (8), and allowing hydrogen to gradually penetrate into the sample (13); S6, applying a required torque value to the sample (13) through the first driving mechanism (3), and observing through the camera (29); S7. Monitor, analyze and collect test data of the sample (13) through the external experiment controller (7).

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