Hydrogen-induced crack testing device

Abstract

The hydrogen-induced crack testing device comprises a metal sample, the metal sample comprises a first end part, a sample section and a second end part which are connected in sequence in a first direction, the sample section is provided with a first cavity, and electrolyte is contained in the first cavity; a driver, a first clamp and a second clamp are arranged on the frame body; a second cavity is defined by the test box and at least one outer side wall of the sample section, and electrolyte is contained in the second cavity; the tester can electrolyze the electrolyte in the first cavity so as to generate hydrogen atoms on the surface of the metal sample; the crack monitor is connected with the sample section; and the computer is electrically connected with the tester and the crack monitor. Therefore, the hydrogen-induced crack testing device has the advantage that whether hydrogen-induced cracks are generated in the metal sample under different stress and hydrogen concentration combinations or not can be conveniently monitored in real time.

Description

Technical Field

[0001] The invention relates to the technical field of material mechanical property testing equipment, and in particular to a hydrogen-induced crack testing device. Background Art

[0002] Hydrogen-induced cracking (or hydrogen embrittlement) is an embrittlement phenomenon caused by the presence of hydrogen in metals or alloys. When hydrogen atoms penetrate into the interior of metals or alloys, they may accumulate in stress concentration areas (such as crack tips) to accelerate crack propagation and cause embrittlement of the material. Hydrogen-induced cracking is a serious problem for many industrial applications (such as oil and gas transportation, high-pressure hydrogen storage equipment, etc.) because it can lead to sudden equipment failure and possible catastrophic consequences. Therefore, real-time monitoring and prediction of this phenomenon is particularly important.

[0003] Stress and hydrogen concentration are the two most important factors affecting the degree of hydrogen embrittlement of a particular material. If the hydrogen concentration of a material when hydrogen embrittlement occurs (the typical characteristic is the occurrence of hydrogen-induced cracks) can be quantitatively tested, it will be of great significance to understanding the hydrogen embrittlement performance of the material. However, in related technologies, it is still difficult to achieve simultaneous quantitative characterization of stress and hydrogen concentration when hydrogen embrittlement occurs. 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. To this end, an embodiment of the present invention provides a hydrogen induced crack testing device.

[0005] The hydrogen-induced crack testing device according to the embodiment of the present invention comprises:

[0006] A metal sample, wherein the metal sample comprises a first end, a sample section, and a second end connected in sequence in a first direction, wherein the sample section has a first cavity, and an electrolyte is contained in the first cavity;

[0007] A frame, wherein a driver, a first clamp and a second clamp are provided on the frame, the first clamp and the second clamp can move relative to each other in the first direction, the first clamp is used to clamp the first end, and the second clamp is used to clamp the second end, and the driver is connected to at least one of the first clamp and the second clamp, so that the first clamp and the second clamp cooperate to stretch the metal sample in the first direction;

[0008] A test box, wherein the test box and at least one outer side wall of the sample section define a second cavity, and the second cavity contains an electrolyte;

[0009] A tester, wherein the tester can electrolyze the electrolyte in the first cavity to generate hydrogen atoms on the surface of the metal sample, and when the hydrogen atoms in the first cavity penetrate the side wall of the sample section, a current can be generated and conducted to the electrolyte in the second cavity, and the tester can monitor the current value in the electrolyte in the second cavity through the electrolyte in the second cavity, so as to monitor the hydrogen concentration on the surface of the metal sample according to the current value;

[0010] A crack monitor, the crack monitor is connected to the sample section so as to monitor whether cracks occur in the sample section;

[0011] A computer is electrically connected to the tester and the crack monitor.

[0012] Therefore, the hydrogen-induced crack testing device according to the embodiment of the present invention has the advantage of being able to monitor in real time whether hydrogen-induced cracks occur in a metal sample under different combinations of stress and hydrogen concentration.

[0013] In some embodiments, the first electrode and the second electrode of the tester are both located in the electrolyte in the first cavity, and the tester can electrolyze the electrolyte through the first electrode and the second electrode to generate hydrogen atoms on the surface of the metal sample, and the third electrode of the tester is located in the electrolyte in the second cavity and monitors the current value in the electrolyte in the second cavity.

[0014] In some embodiments, the tester includes an electrochemical workstation and a constant current meter, the constant current meter is connected to the electrochemical workstation via a wire, the electrochemical workstation is respectively connected to the first electrode and the second electrode via wires, the constant current meter is connected to the third electrode via a wire, the electrochemical workstation and the constant current meter are both connected to the computer, and the third electrode is a platinum electrode.

[0015] In some embodiments, the crack monitor includes at least two sensors for receiving sound waves, and the sensors are disposed on the outer side wall of the sample segment.

[0016] In some embodiments, the crack monitor includes a preamplifier and two sensors, the two sensors are located on both sides of the first cavity in the first direction, the two sensors are connected to the preamplifier, and the preamplifier is connected to the computer.

[0017] In some embodiments, the sample segment has a mounting hole penetrating therethrough along the second direction, and a first cover plate and a second cover plate are provided on both sides of the sample segment in the second direction to cover the mounting hole, and the mounting hole, the first cover plate and the second cover plate define the first cavity, and the first cover plate is provided with a first through hole and a second through hole communicating with the first cavity, and the electrolyte can pass through the first through hole into the first cavity, and the first electrode and the second electrode extend into the first cavity through the second through hole;

[0018] The sample section has a first side wall and a second side wall defining the first cavity in the third direction, any two of the first direction, the second direction and the third direction are perpendicular to each other, the test box and at least one of the outer wall surface of the first side wall and the outer wall surface of the second side wall define the second cavity, and the top of the test box is provided with a third through hole and a fourth through hole connected to the second cavity, the electrolyte can pass into the second cavity through the third through hole, and the third electrode can extend into the second cavity through the fourth through hole.

[0019] In some embodiments, the first direction is an up-down direction, the frame includes two slide bars spaced apart in the third direction, the slide bars extend in the up-down direction, the first clamp is located below the second clamp, and the second clamp is slidably disposed on the two slide bars in the up-down direction;

[0020] The driver is a hydraulic cylinder, which is connected to the second fixture via a loading rod, and the driver is provided with a load sensor and a force controller that cooperate with the loading rod;

[0021] The test box and the outer wall surface of the first side wall define the second cavity.

[0022] In some embodiments, a dimension of each of the first end and the second end in the first direction is greater than or equal to 3 cm and less than or equal to 5 cm;

[0023] The thickness of the first side wall and the second side wall in the third direction is greater than or equal to 1 mm and less than or equal to 3 mm;

[0024] The dimensions of the first end and the second end in the third direction are both larger than the dimension of the sample segment in the third direction;

[0025] The sensor is located in the middle of the sample segment in the third direction, and the distance between the sensor and the end of the sample segment in the first direction is greater than or equal to 0.5 cm and less than or equal to 1.5 cm;

[0026] In a cross section perpendicular to the first direction, the outer periphery of each of the projection of the first end, the projection of the sample section, and the projection of the second end is a rectangle;

[0027] The first cover plate and the second cover plate are both rubber plates, and a sealing plug is provided on at least one of the first through hole, the second through hole, the third through hole and the fourth through hole.

[0028] In some embodiments, the frame is provided with a third clamp and a fourth clamp connected to each other, the third clamp and the fourth clamp define a clamp hole, a sliding rod is located in the clamp hole, an elastic member abutting against the sliding rod is provided in the clamp hole, the third clamp and the fourth clamp are respectively connected to the two sides of the test box in the second direction, and at least a portion of each of the third clamp, the fourth clamp and the test box is in contact with the outer wall surface of the sample segment.

[0029] In some embodiments, the electrolyte is a NaOH solution, and the strain rate at which the first clamp and the second clamp stretch the metal sample is less than or equal to 1×10 -6 per second. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of a hydrogen-induced crack testing device according to an embodiment of the present invention.

[0031] Figure 2 is a top view of a metal sample according to an embodiment of the present invention.

[0032] Figure 3 is a side view of a metal coupon according to an embodiment of the present invention.

[0033] Reference numerals:

[0034] Metal sample 1, first end 11, sample section 12, second end 13, first cover plate 14, first through hole 141, second through hole 142, first side wall 15, second side wall 16, first cavity 17;

[0035] The frame 2, the driver 21, the first clamp 22, the second clamp 23, the third clamp 24, the fourth clamp 25, the clamp hole 26, the elastic member 27, and the slide bar 28;

[0036] Test box 3, second cavity 31, third through hole 32, fourth through hole 33;

[0037] A first electrode 41, a second electrode 42, and a third electrode 43;

[0038] Sensor 5, preamplifier 51;

[0039] Computer 6;

[0040] Electrochemical workstation 7;

[0041] Galvanostatic instrument8. DETAILED DESCRIPTION

[0042] 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.

[0043] The following describes a hydrogen induced crack testing device according to an embodiment of the present invention with reference to the accompanying drawings. Figures 1 to 3 As shown, the hydrogen-induced crack testing device according to an embodiment of the present invention includes a metal specimen 1 , a frame 2 , a testing box 3 , a tester, a crack monitor and a computer 6 .

[0044] The metal sample 1 comprises a first end 11 , a sample section 12 and a second end 13 connected in sequence in a first direction. The sample section 12 has a first cavity 17 , and the first cavity 17 contains an electrolyte.

[0045] The frame 2 is provided with a driver 21, a first clamp 22, and a second clamp 23, and the first clamp 22 and the second clamp 23 can move relative to each other in a first direction. The first clamp 22 is used to clamp the first end 11, and the second clamp 23 is used to clamp the second end 13. The driver 21 is connected to at least one of the first clamp 22 and the second clamp 23, so that the first clamp 22 and the second clamp 23 cooperate to stretch the metal sample 1 in the first direction. That is, the metal sample 1 can be stretched by the driver 21, the first clamp 22, and the second clamp 23 on the frame 2, so as to determine the stress and strain of the stretched metal sample 1.

[0046] The test box 3 and at least one outer side wall of the sample section 12 define a second cavity 31 , and the second cavity 31 contains electrolyte.

[0047] The tester can electrolyze the electrolyte in the first cavity 17 to generate hydrogen atoms on the surface of the metal sample 1. When the hydrogen atoms in the first cavity 17 penetrate the side wall of the sample segment 12, they can generate current and conduct it to the electrolyte in the second cavity 31. The tester can monitor the current value in the electrolyte in the second cavity 31 through the electrolyte in the second cavity 31, so as to monitor the hydrogen concentration (hydrogen atom concentration) on the surface of the metal sample 1 according to the current value. Specifically, when the hydrogen atoms penetrate the sample segment 12, a current will be conducted to the electrolyte in the second cavity 31. The more hydrogen atoms penetrate the outer surface of the sample segment 12, the larger the monitored current value, and the hydrogen concentration on the surface of the metal sample 1 (sample segment 12) can be calculated based on the monitored current value.

[0048] The crack monitor is connected to the sample section 12 to monitor whether cracks occur in the sample section 12. Thus, cracks in the metal sample 1 (sample section 12) can be monitored by the crack monitor.

[0049] The computer 6 is electrically connected to the tester and the crack monitor, so that the computer 6 can obtain information about cracks in the metal sample 1 (sample section 12) received by the crack monitor, information about the electrolysis current value of the tester, and information about the current value in the second cavity 31.

[0050] The hydrogen-induced crack test device according to the embodiment of the present invention can determine the stress and strain of the metal sample 1 through the frame 2, the hydrogen concentration on the surface of the metal sample 1 (sample section 12) can be determined through the test box 3 and the tester, and whether the metal sample 1 has hydrogen-induced cracks can be determined through the crack monitor. Therefore, the hydrogen concentration on the surface of the metal sample 1 (sample section 12) can be controlled by controlling the magnitude of the current value of the electrolysis of the electrolyte, and the metal sample 1 can be stretched when the hydrogen concentration on the surface of the metal sample 1 (sample section 12) remains unchanged. In order to determine the relationship between the strain and stress of the stretched metal sample 1 and hydrogen-induced cracks under the preset value of the hydrogen concentration on the surface of the metal sample 1 (sample section 12), that is, to perform a constant hydrogen concentration variable force test on the metal sample 1. It is also possible to control the magnitude of the current value of the electrolysis of the electrolyte to control the hydrogen concentration on the surface of the metal sample 1 (sample section 12) when the strain and stress of the stretched metal sample 1 remain unchanged, thereby determining the relationship between the hydrogen concentration on the surface of the metal sample 1 (sample section 12) and hydrogen-induced cracks, that is, to perform a constant force variable hydrogen concentration test on the metal sample 1. Therefore, the hydrogen-induced crack testing device according to the embodiment of the present invention can be convenient for real-time monitoring of whether hydrogen-induced cracks occur in the metal sample 1 under different combinations of stress and hydrogen concentration.

[0051] Therefore, the hydrogen-induced crack testing device according to the embodiment of the present invention has the advantage of being able to monitor in real time whether hydrogen-induced cracks occur in the metal sample 1 under different combinations of stress and hydrogen concentration.

[0052] like Figures 1 to 3 As shown, in some embodiments, the first electrode 41 and the second electrode 42 of the tester are both located in the electrolyte in the first cavity 17, and the tester can electrolyze the electrolyte through the first electrode 41 and the second electrode 42 to generate hydrogen atoms on the surface of the metal sample 1, and the third electrode 43 of the tester is located in the electrolyte in the second cavity 31 and monitors the current value in the electrolyte in the second cavity 31.

[0053] In some embodiments, the tester includes an electrochemical workstation 7 and a constant current meter 8, the constant current meter 8 is connected to the electrochemical workstation 7 via a wire, the electrochemical workstation 7 is connected to the first electrode 41 and the second electrode 42 via wires, the constant current meter 8 is connected to the third electrode 43 via a wire, the electrochemical workstation 7 and the constant current meter 8 are both connected to the computer 6, and the third electrode 43 is a platinum electrode.

[0054] Specifically, the first electrode 41 is a reference electrode, which is a reference electrode for measuring the electrode potential of the chemical reaction in the first cavity 17 to ensure the accuracy and stability of the current. The second electrode 42 is an auxiliary electrode, which forms a polarization loop with the working electrode, so that the working electrode has current passing through it and does not participate in the reaction. The platinum electrode is a kind of auxiliary electrode, and is often used as an auxiliary electrode because of the stability of platinum sheet metal.

[0055] The electrochemical workstation 7 and the constant current meter 8 are connected in series, and the constant current meter 8 is used to provide a constant current so that the first electrode 41 and the second electrode 42 electrolyze water in the first cavity 17 and generate hydrogen atoms to penetrate into the metal sample 1. The electrochemical workstation 7 can monitor the current change caused by the hydrogen penetrating the metal sample 1 in the second cavity 31 through the third electrode 43.

[0056] like Figure 1 As shown, in some embodiments, the crack monitor includes at least two sensors 5 for receiving sound waves, and the sensors 5 are arranged on the outer wall of the sample section 12. Thus, the sound waves generated by the cracks in the metal sample 1 (sample section 12) can be received by the sensors 5, so as to determine whether hydrogen-induced cracking occurs in the metal sample 1 (sample section 12) based on the sound waves received by the sensors 5.

[0057] like Figures 1 to 3 As shown, the metal sample 1 includes a first end 11, a sample section 12, and a second end 13 connected in sequence in the first direction, and the sample section 12 has a first cavity 17, and the first cavity 17 contains an electrolyte. Specifically, the first direction is the up-down direction, and the up-down direction is indicated by the arrows in the figure. For example, the first end 11, the sample section 12, and the second end 13 are arranged in sequence from bottom to top.

[0058] In some embodiments, the size of each of the first end 11 and the second end 13 in the first direction is greater than or equal to 3 cm and less than or equal to 5 cm. The sizes of the first end 11 and the second end 13 in the third direction are both greater than the size of the sample section 12 in the third direction. The first end 11 and the second end 13 are convenient for clamping by a clamp. The sizes of the first end 11 and the second end 13 are large, so that the metal sample 1 is not easily broken during the stretching process. The size of the first end 11 and the second end 13 in the second direction is equal to the size of the sample section 12 in the second direction, and any two of the first direction, the second direction and the third direction are perpendicular to each other. The second direction can be the front-to-back direction, and the third direction can be the left-to-right direction. For example, the size of each of the first end 11 and the second end 13 in the up-down direction is 4 cm. The sizes of the first end 11 and the second end 13 in the left-to-right direction are both greater than the size of the sample section 12 in the left-to-right direction. The sizes of the first end 11 and the second end 13 in the front-to-back direction are equal to the sizes of the sample section 12 in the front-to-back direction.

[0059] In some embodiments, in a cross section perpendicular to the first direction, the outer contour of each of the projection of the first end 11, the projection of the sample section 12, and the projection of the second end 13 is a rectangle. Specifically, the first end 11 and the second end 13 form an angle with the sample section 12. For example, in a cross section perpendicular to the up-down direction, the outer contour of each of the projection of the first end 11, the projection of the sample section 12, and the projection of the second end 13 is a rectangle. The upper surface of the first end 11 forms an angle with the side surface of the sample section 12 in the third direction (left-right direction). The lower surface of the second end 13 forms an angle with the side surface of the sample section 12 in the third direction (left-right direction).

[0060] like Figures 1 to 3 As shown, in some embodiments, the specimen section 12 has a mounting hole extending therethrough along the second direction.

[0061] The sample section 12 is provided with a first cover plate 14 and a second cover plate covering the mounting hole on both sides in the second direction, and the mounting hole, the first cover plate 14 and the second cover plate define a first cavity 17. The first cover plate 14 is provided with a first through hole 141 and a second through hole 142 communicating with the first cavity 17, and the electrolyte can pass into the first cavity 17 through the first through hole 141, and the first electrode 41 and the second electrode 42 extend into the first cavity 17 through the second through hole 142. For example, the mounting hole passes through the sample section 12 in the front-to-back direction, and the mounting hole is a rectangular hole. The first cover plate 14 is located at the rear side of the mounting hole.

[0062] The sample section 12 has a first side wall 15 and a second side wall 16 defining a first cavity 17 in the third direction. The test box 3 and at least one of the outer wall surface of the first side wall 15 and the outer wall surface of the second side wall 16 define a second cavity 31. The top of the test box 3 is provided with a third through hole 32 and a fourth through hole 33 connected to the second cavity 31. The electrolyte can pass into the second cavity 31 through the third through hole 32, and the third electrode 43 can extend into the second cavity 31 through the fourth through hole 33. Specifically, the test box 3 and the outer wall surface of the first side wall 15 define the second cavity 31. Thus, the hydrogen atoms (hydrogen atoms) in the first cavity 17 can penetrate the first side wall 15, and current can be generated in the first side wall 15 during this process. For example, the first side wall 15 is located on the right side of the second side wall 16.

[0063] In some embodiments, the first cover plate 14 and the second cover plate are both rubber plates, and a sealing plug is provided on at least one of the first through hole 141, the second through hole 142, the third through hole 32, and the fourth through hole 33. Specifically, a sealing plug is provided on the first through hole 141, the second through hole 142, the third through hole 32, and the fourth through hole 33, so as to prevent the gas in the first cavity 17 from being discharged from the first through hole 141 and the second through hole 142, and prevent the gas in the second cavity 31 from being discharged from the third through hole 32 and the fourth through hole 33.

[0064] In some embodiments, the thickness of the first side wall 15 and the second side wall 16 in the third direction is greater than or equal to 1 mm and less than or equal to 3 mm. For example, the thickness of the first side wall 15 and the second side wall 16 in the third direction is 2 mm.

[0065] like Figure 1 As shown, in some embodiments, the frame 2 includes two slide bars 28 spaced apart in the third direction, the slide bars 28 extend in the up-down direction, the first clamp 22 is located below the second clamp 23, the second clamp 23 is slidably disposed on the two slide bars 28 in the up-down direction, and the first direction is perpendicular to the second direction. For example, the two slide bars 28 are spaced apart in the left-right direction.

[0066] The driver 21 is a hydraulic cylinder, which is connected to the second clamp 23 through a loading rod. A load sensor and a force controller that cooperate with the loading rod are provided on the driver 21. Therefore, the load sensor can be used to measure the force of the loading rod, and then the stress applied to the metal sample 1 can be measured, and the tensile force on the metal sample 1 can be adjusted through the force controller.

[0067] like Figure 1 and Figure 2 As shown, in some embodiments, the frame 2 is provided with a third clamp 24 and a fourth clamp 25 connected to each other.

[0068] The third clamp 24 (handle) and the fourth clamp 25 (handle) define a clamp hole 26, a slide bar 28 is located in the clamp hole 26, and an elastic member 27 is provided in the clamp hole 26 to abut against the slide bar 28. The elastic member 27 can be elastically deformed in the third direction. For example, the elastic member 27 is a spring, and the right side of the spring abuts against the slide bar 28. The third clamp 24 (handle) and the fourth clamp 25 (handle) are connected by bolts.

[0069] At least part of the third clamp 24 (clamping part) and the fourth clamp 25 (clamping part) are located on both sides of the metal sample 1 in the second direction, and the third clamp 24 (clamping part) and the fourth clamp 25 (clamping part) are respectively connected to both sides of the test box 3 in the second direction, and at least part of each of the third clamp 24, the fourth clamp 25 and the test box 3 is in contact with the outer wall surface of the sample section 12. The third clamp 24 (clamping part), the fourth clamp 25 (clamping part) and the test box 3 are arranged around the circumference of the metal sample 1. For example, there are two third clamps 24 and two fourth clamps 25, and the two third clamps 24 and the two fourth clamps 25 are connected one by one. For example, the test box 3 is made of high-strength polyethylene material with a thickness of 4 mm.

[0070] like Figure 1 As shown, in some embodiments, the crack monitor includes a preamplifier 51 and two sensors 5, the two sensors 5 are located on both sides of the first cavity 17 in the first direction, the two sensors 5 are connected to the preamplifier 51, and the preamplifier 51 is connected to the computer 6. The crack monitor also includes AE signal (acoustic emission signal) acquisition software. The two sensors 5 are located on the same straight line. The output of the sensor 5 is amplified by the preamplifier 51 and input into the computer 6.

[0071] In some embodiments, the sensor 5 is located in the middle of the sample segment 12 in the third direction, and the distance between the sensor 5 and the end of the sample segment 12 in the first direction is greater than or equal to 0.5 cm and less than or equal to 1.5 cm. For example, the sensor 5 is located on the central axis of the rear wall of the sample segment 12, the distance between the sensor 5 located above the first cavity 17 and the second end 13 is 1 cm, and the distance between the sensor 5 located below the first cavity 17 and the first end 11 is 1 cm.

[0072] In some embodiments, the electrolyte is a NaOH solution, and the strain rate of the first clamp 22 and the second clamp 23 stretching the metal sample 1 is less than or equal to 1×10 -6 For example, the electrolyte in the first cavity 17 and the electrolyte in the second cavity 31 are both 0.1 mol / L NaOH solutions.

[0073] The hydrogen-induced crack testing device according to the embodiment of the present invention has a relatively simple overall structure, is easy to install, and has low cost. A mechanical stress loading device is used to apply a set stress to the metal sample 1; while the metal sample 1 is stretched, the hydrogen concentration and the hydrogen-induced crack condition of the metal sample 1 can be measured in real time, thereby achieving real-time monitoring of the generation of hydrogen-induced cracks under different combinations of stress and hydrogen concentration.

[0074] In the description of the present invention, it should 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean 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 described specific features, structures, materials or characteristics 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.

[0079] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A hydrogen induced crack testing device, characterized in that: include: A metal sample, wherein the metal sample comprises a first end, a sample section, and a second end connected in sequence in a first direction, wherein the sample section has a first cavity, and an electrolyte is contained in the first cavity; A frame, wherein a driver, a first clamp and a second clamp are provided on the frame, the first clamp and the second clamp can move relative to each other in the first direction, the first clamp is used to clamp the first end, and the second clamp is used to clamp the second end, and the driver is connected to at least one of the first clamp and the second clamp, so that the first clamp and the second clamp cooperate to stretch the metal sample in the first direction; A test box, wherein the test box and at least one outer side wall of the sample section define a second cavity, and the second cavity contains an electrolyte; A tester, wherein the tester can electrolyze the electrolyte in the first cavity to generate hydrogen atoms on the surface of the metal sample, and when the hydrogen atoms in the first cavity penetrate the side wall of the sample section, a current can be generated and conducted to the electrolyte in the second cavity, and the tester can monitor the current value in the electrolyte in the second cavity through the electrolyte in the second cavity, so as to monitor the hydrogen concentration on the surface of the metal sample according to the current value; A crack monitor, the crack monitor is connected to the sample section so as to monitor whether cracks occur in the sample section; A computer is electrically connected to the tester and the crack monitor.

2. The hydrogen induced crack testing device according to claim 1, characterized in that: The first electrode and the second electrode of the tester are both located in the electrolyte in the first cavity. The tester can electrolyze the electrolyte through the first electrode and the second electrode to generate hydrogen atoms on the surface of the metal sample. The third electrode of the tester is located in the electrolyte in the second cavity and monitors the current value in the electrolyte in the second cavity.

3. The hydrogen induced crack testing device according to claim 2, characterized in that: The tester includes an electrochemical workstation and a constant current meter, the constant current meter is connected to the electrochemical workstation via a wire, the electrochemical workstation is respectively connected to the first electrode and the second electrode via wires, the constant current meter is connected to the third electrode via a wire, the electrochemical workstation and the constant current meter are both connected to the computer, and the third electrode is a platinum electrode.

4. The hydrogen induced crack testing device according to claim 2, characterized in that: The crack monitor includes at least two sensors for receiving sound waves, and the sensors are arranged on the outer side wall of the sample section.

5. The hydrogen induced crack testing device according to claim 4, characterized in that: The crack monitor includes a preamplifier and two sensors, the two sensors are located on both sides of the first cavity in the first direction, the two sensors are connected to the preamplifier, and the preamplifier is connected to the computer.

6. The hydrogen induced crack testing device according to claim 4, characterized in that: The sample section has a mounting hole penetrating therethrough along a second direction, a first cover plate and a second cover plate are provided on both sides of the sample section in the second direction to cover the mounting hole, the mounting hole, the first cover plate and the second cover plate define the first cavity, the first cover plate is provided with a first through hole and a second through hole communicating with the first cavity, the electrolyte can pass through the first through hole into the first cavity, and the first electrode and the second electrode extend into the first cavity through the second through hole; The sample section has a first side wall and a second side wall defining the first cavity in the third direction, any two of the first direction, the second direction and the third direction are perpendicular to each other, the test box and at least one of the outer wall surface of the first side wall and the outer wall surface of the second side wall define the second cavity, and the top of the test box is provided with a third through hole and a fourth through hole connected to the second cavity, the electrolyte can pass into the second cavity through the third through hole, and the third electrode can extend into the second cavity through the fourth through hole.

7. The hydrogen induced crack testing device according to claim 6, characterized in that: The first direction is the up-down direction, the frame includes two slide bars spaced apart in the third direction, the slide bars extend in the up-down direction, the first clamp is located below the second clamp, and the second clamp is slidably disposed on the two slide bars in the up-down direction; The driver is a hydraulic cylinder, which is connected to the second fixture via a loading rod, and the driver is provided with a load sensor and a force controller that cooperate with the loading rod; The test box and the outer wall surface of the first side wall define the second cavity.

8. The hydrogen induced crack testing device according to claim 7, characterized in that: A dimension of each of the first end and the second end in the first direction is greater than or equal to 3 cm and less than or equal to 5 cm; The thickness of the first side wall and the second side wall in the third direction is greater than or equal to 1 mm and less than or equal to 3 mm; The dimensions of the first end and the second end in the third direction are both larger than the dimension of the sample segment in the third direction; The sensor is located in the middle of the sample segment in the third direction, and the distance between the sensor and the end of the sample segment in the first direction is greater than or equal to 0.5 cm and less than or equal to 1.5 cm; In a cross section perpendicular to the first direction, the outer periphery of each of the projection of the first end, the projection of the sample section, and the projection of the second end is a rectangle; The first cover plate and the second cover plate are both rubber plates, and a sealing plug is provided on at least one of the first through hole, the second through hole, the third through hole and the fourth through hole.

9. The hydrogen induced crack testing device according to claim 7, characterized in that: The frame is provided with a third clamp and a fourth clamp connected to each other, the third clamp and the fourth clamp define a clamp hole, a sliding rod is located in the clamp hole, an elastic member abutting against the sliding rod is provided in the clamp hole, the third clamp and the fourth clamp are respectively connected to two sides of the test box in the second direction, and at least a portion of each of the third clamp, the fourth clamp and the test box is in contact with the outer wall surface of the sample section.

10. The hydrogen induced crack testing device according to any one of claims 1 to 9, characterized in that: The electrolyte is NaOH solution, and the strain rate of the first clamp and the second clamp in stretching the metal sample is less than or equal to 1×10 -6 per second.

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