Hydrogen embrittlement test environment simulation system and use method thereof

Abstract

The present application relates to the technical field of hydrogen embrittlement testing, and provides a hydrogen embrittlement testing environment simulation system and a method for using the same. The hydrogen embrittlement testing environment simulation system includes: a first closed container that can be opened and closed, provided with a first accommodating chamber for placing hydrogen embrittlement specimens, a first air inlet connected to the first accommodating chamber provided on the first closed container, the first air inlet used to be connected to a hydrogen supply device, a first air inlet valve provided between the first air inlet and the hydrogen supply device; a vacuum device connected to the first accommodating chamber, the vacuum device used to vacuum the first accommodating chamber; and a pressure measuring device used to measure the pressure in the first accommodating chamber. The hydrogen embrittlement testing environment simulation system of the present application can obtain hydrogen embrittlement specimens under variable conditions.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogen embrittlement testing, and in particular to a hydrogen embrittlement testing environment simulation system and a method for using the same. Background Art

[0002] As one of the most promising secondary energy sources in the 21st century, hydrogen energy has a wide range of utilization forms and application fields. During the production, purification, storage and transportation of hydrogen, hydrogen atoms will penetrate, diffuse and gather inside the metal material, and locally enrich in certain parts, promoting the movement of metal dislocations, reducing the cohesive force of grain boundaries, resulting in a decrease in the macroscopic plasticity and strength of the metal, and even inducing hydrogen-induced cracks, namely hydrogen embrittlement. Therefore, it is necessary to conduct hydrogen embrittlement tests on metal materials that are exposed to hydrogen.

[0003] Although traditional testing experiments are relatively mature in evaluating the hydrogen embrittlement tendency of materials, there are many factors that affect metal hydrogen embrittlement. The diversity and variability of the actual engineering environment make it difficult for the design and prediction based on the experimental results to accurately serve the actual working conditions. Therefore, it is necessary to develop a hydrogen embrittlement test environment simulation system to obtain hydrogen embrittlement specimens under variable conditions. Summary of the invention

[0004] The present application provides a hydrogen embrittlement test environment simulation system and a method for using the same to obtain hydrogen embrittlement specimens under variable conditions.

[0005] The embodiment of the first aspect of the present application provides a hydrogen embrittlement test environment simulation system, comprising:

[0006] A first airtight container that can be opened and closed, wherein a first accommodating cavity for placing a hydrogen embrittlement sample is provided inside the first airtight container, a first air inlet communicating with the first accommodating cavity is provided on the first airtight container, the first air inlet is used to communicate with a hydrogen supply device, and a first air inlet valve is provided between the first air inlet and the hydrogen supply device;

[0007] A vacuum pumping device, the vacuum pumping device is connected to the first accommodating chamber, and the vacuum pumping device is used to vacuum the first accommodating chamber; and

[0008] A pressure measuring device is used to measure the pressure in the first containing chamber.

[0009] In some embodiments, the hydrogen embrittlement test environment simulation system also includes a second sealed container, in which a second accommodating chamber for accommodating an inert gas is provided; the first sealed container is also provided with a second air inlet and a sampling port, the second air inlet and the sampling port are both connected to the first accommodating chamber, the second air inlet is connected to the second accommodating chamber, a second air inlet valve is provided between the second air inlet and the second sealed container, and an opening and closing valve is provided on the sampling port.

[0010] In some embodiments, the hydrogen embrittlement test environment simulation system further includes a heating device and a temperature measuring device, wherein the heating device is used to heat the hydrogen to be passed through the first air inlet, and the temperature measuring device is used to measure the temperature in the first containing cavity.

[0011] In some embodiments, the heating device includes a shell-and-tube heat exchanger and a water vapor component, the shell-and-tube heat exchanger having a tube-side inlet, a tube-side outlet, a shell-side inlet and a shell-side outlet, the water vapor component having a steam outlet and a steam inlet, the tube-side inlet being used to communicate with the hydrogen supply device, the tube-side outlet being used to communicate with the first air inlet, the steam outlet being connected to the shell-side inlet, and the steam inlet being connected to the shell-side outlet.

[0012] In some embodiments, a third air inlet connected to the first containing chamber is further provided on the first sealed container; the hydrogen embrittlement test environment simulation system also includes a three-way valve, which is respectively connected to the third air inlet, the steam inlet and the shell outlet; the hydrogen embrittlement test environment simulation system also includes a humidity measuring device, which is used to measure the humidity in the first containing chamber.

[0013] In some embodiments, the hydrogen embrittlement test environment simulation system also includes a stress adjustment device, which is placed in the first accommodating cavity. The stress adjustment device includes a fixed seat and a movable seat that are relatively arranged. The fixed seat is provided with a fixed clamp, and the movable seat is provided with a movable clamp. The fixed clamp and the movable clamp are respectively used to be connected to the opposite ends of the hydrogen embrittlement specimen, and the movable clamp can be away from or close to the fixed clamp so that the hydrogen embrittlement specimen is stretched or squeezed by the fixed clamp and the movable clamp.

[0014] In some of the embodiments, the movable fixture includes a screw and a clamping member, the screw extends in a direction parallel to the connecting line between the fixed fixture and the movable fixture, the screw is movably arranged on the movable seat, the clamping member is connected to one end of the screw close to the fixed fixture, and the clamping member is used to connect to the hydrogen embrittlement specimen.

[0015] In some embodiments, the movable clamp also includes a rotating handle and two limit pins, one end of the rotating handle is connected to the screw rod; two limit holes are provided on the movable seat, and the two limit pins are respectively inserted into the two limit holes, and the two limit pins are respectively located on the opposite sides of the rotating handle to limit the rotation of the rotating handle around the screw rod at one end away from the screw rod.

[0016] In some of the embodiments, the hydrogen embrittlement test environment simulation system further includes a stress measuring device, and the stress measuring device is used to measure the tensile stress or compressive stress to which the hydrogen embrittlement specimen is subjected after being stretched or squeezed by the fixed fixture and the movable fixture.

[0017] An embodiment of the second aspect of the present application provides a method for using the hydrogen embrittlement test environment simulation system as described in the first aspect, comprising:

[0018] Providing a hydrogen embrittlement specimen;

[0019] Putting the hydrogen embrittlement sample into the first containing cavity and closing the first sealed container;

[0020] Using the vacuum pumping device to vacuum the first containing chamber;

[0021] Opening the first air inlet valve, introducing hydrogen into the first containing chamber, and closing the first air inlet valve after the reading of the pressure measuring device reaches a preset value;

[0022] After the preset time is reached, the hydrogen embrittlement sample is taken out from the first containing cavity.

[0023] The hydrogen embrittlement test environment simulation system provided in the embodiment of the present application has the beneficial effect that: since the first air inlet is used to communicate with the hydrogen supply device, a first air inlet valve is arranged between the first air inlet and the hydrogen supply device, and a pressure measuring device is arranged to measure the pressure in the first containing chamber, hydrogen embrittlement specimens under various hydrogen pressures can be obtained by introducing different volumes of hydrogen into the first containing chamber.

[0024] The beneficial effects of the use method of the hydrogen embrittlement test environment simulation system provided in the present application compared with the prior art are the same as the beneficial effects of the hydrogen embrittlement test environment simulation system provided in the present application compared with the prior art, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 This is a schematic diagram of the structure of a hydrogen embrittlement test environment simulation system in one of the embodiments of the present application;

[0027] Figure 2 is a schematic diagram of the structure of a stress adjustment device and a hydrogen embrittlement specimen in one of the embodiments of the present application;

[0028] Figure 3 yes Figure 1 A right side view of the stress adjustment device shown;

[0029] Figure 4 is a schematic structural diagram of a stress adjustment device and a hydrogen embrittlement specimen in another embodiment of the present application;

[0030] Figure 5 yes Figure 4 Top view of the hydrogen embrittled specimen shown.

[0031] The meanings of the marks in the figure are:

[0032] 100. Hydrogen embrittlement test environment simulation system; 10. First closed container; 10a. First containing cavity; 11. First air inlet; 12. Pressure measuring device; 13. Second air inlet; 14. Sampling port; 15. Temperature measuring device; 16. Third air inlet; 17. Humidity measuring device; 20. Hydrogen supply device; 21. First air inlet valve; 30. Vacuuming device; 40. Second closed container; 40a. Second containing cavity; 41. Second air inlet valve; 50. Shell-and-tube heat exchanger; 51. Tube inlet; 5 2. Tube side outlet; 53. Shell side inlet; 54. Shell side outlet; 60. Water vapor component; 61. Steam outlet; 62. Steam inlet; 63. Delivery pump; 64. Third air inlet valve; 70. Three-way valve; 80. Stress adjustment device; 81. Fixed seat; 82. Moving seat; 821. Limiting hole; 83. Fixed fixture; 84. Moving fixture; 841. Screw; 842. Clamping piece; 843. Rotating handle; 844. Limiting pin; 85. Support seat; 200. Hydrogen embrittlement test specimen; 210. Test hole. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0034] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0035] 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] References to "one embodiment", "some embodiments" or "an embodiment" described in the specification of this application mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some other embodiments", "in some other embodiments", etc., which appear at different places in this specification, do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. In addition, in one or more embodiments, particular features, structures or characteristics may be combined in any suitable manner.

[0037] In order to illustrate the technical solution of the present application, a description is given below with reference to specific drawings and embodiments.

[0038] Please refer to Figure 1 An embodiment of the present application provides a hydrogen embrittlement test environment simulation system 100, including a first closed container 10, a vacuum pumping device 30 and a pressure measuring device 12.

[0039] The first sealed container 10 can be opened and closed, and can be configured as a box, a tank or other shaped container with an openable and closable sealing cover, and the first sealed container 10 is provided with a first accommodating cavity 10a for placing the hydrogen embrittlement specimen 200. The hydrogen embrittlement specimen 200 can be any metal specimen that needs to be subjected to a hydrogen embrittlement detection test, such as a steel plate.

[0040] The first closed container 10 is provided with a first air inlet 11 connected with the first accommodating cavity 10a. The first air inlet 11 is used to be connected with a hydrogen supply device 20. The hydrogen supply device 20 can be any device that can produce hydrogen. A first air inlet valve 21 is provided between the first air inlet 11 and the hydrogen supply device 20.

[0041] The vacuum device 30 is connected to the first accommodating chamber 10a, and is used to evacuate the first accommodating chamber 10a. The vacuum device 30 can be a vacuum pump or the like.

[0042] The pressure measuring device 12 is used to measure the pressure in the first accommodating chamber 10a. The pressure measuring device 12 can be set as a pressure sensor, a pressure tester, etc. The pressure measuring device 12 can be directly set inside the first accommodating chamber 10a, or can be set outside the first sealed container 10 and communicated with the first accommodating chamber 10a.

[0043] The hydrogen embrittlement test environment simulation system 100 provided in the embodiment of the present application, when used, comprises the following steps:

[0044] In the first step, a hydrogen embrittled sample 200 is provided.

[0045] In the second step, the hydrogen embrittled sample 200 is placed in the first containing cavity 10a, and the first sealed container 10 is closed.

[0046] In the third step, the first receiving chamber 10 a is evacuated using the vacuum device 30 .

[0047] The fourth step is to open the first air inlet valve 21 and introduce hydrogen into the first accommodating chamber 10a. After the reading of the pressure measuring device 12 reaches a preset value, for example, the preset value may be 2Mpa, 4Mpa, 6Mpa, 8Mpa, 10Mpa, 15MPa, etc., the first air inlet valve 21 is closed.

[0048] Step 5: After a preset time, for example, 72 hours, the hydrogen embrittled sample 200 is taken out from the first containing cavity 10a.

[0049] The hydrogen embrittlement test environment simulation system 100 provided in the embodiment of the present application, since the first air inlet 11 is used to communicate with the hydrogen supply device 20, a first air inlet valve 21 is provided between the first air inlet 11 and the hydrogen supply device 20, and a pressure measuring device 12 is provided to measure the pressure in the first accommodating chamber 10a, hydrogen embrittlement specimens 200 under various hydrogen pressures can be obtained by introducing different volumes of hydrogen into the first accommodating chamber 10a. In this way, the hydrogen embrittlement test environment simulation system 100 provided in the embodiment of the present application can meet the testing requirements of various working conditions and obtain hydrogen embrittlement specimens 200 under various conditions.

[0050] Optionally, the first air inlet valve 21 may be configured as a stop valve with a pressure sensor, so as to facilitate the introduction of hydrogen at a preset pressure into the first accommodating chamber 10a.

[0051] Please continue to refer to Figure 1 In some embodiments, the hydrogen embrittlement test environment simulation system 100 further includes a second sealed container 40, wherein a second containing chamber 40a for containing an inert gas is provided in the second sealed container 40. The inert gas may be any gas that does not cause hydrogen damage to the hydrogen embrittlement sample 200.

[0052] The first sealed container 10 is also provided with a second air inlet 13 and a sampling port 14. The second air inlet 13 and the sampling port 14 are both connected to the first accommodating chamber 10a. The second air inlet 13 is connected to the second accommodating chamber 40a. A second air inlet valve 41 is provided between the second air inlet 13 and the second sealed container 40, and an opening and closing valve (not shown in the figure) is provided on the sampling port 14.

[0053] The hydrogen embrittlement test environment simulation system 100 provided in the above embodiment, when used, comprises the following steps:

[0054] In the first step, a hydrogen embrittled sample 200 is provided.

[0055] In the second step, the hydrogen embrittled sample 200 is placed in the first containing cavity 10a, and the first sealed container 10 is closed.

[0056] In the third step, the first receiving chamber 10 a is evacuated using the vacuum device 30 .

[0057] The fourth step is to open the second air inlet valve 41 and introduce the inert gas into the first accommodating chamber 10a. After the reading of the pressure measuring device 12 reaches the first preset value, the second air inlet valve 41 is closed.

[0058] The fifth step is to open the first air inlet valve 21 and introduce hydrogen into the first accommodating chamber 10a. After the reading of the pressure measuring device 12 reaches the second preset value, the first air inlet valve 21 is closed.

[0059] In the sixth step, the on-off valve is opened, and an appropriate amount of the mixed gas in the first accommodating chamber 10a is taken out from the sampling port 14, and then the on-off valve is closed, and the purity of hydrogen in the mixed gas taken out from the sampling port 14 is detected by using a chromatograph or other instrument. The appropriate amount refers to the minimum amount that at least meets the detection requirements of the chromatograph or other instrument. For example, the molar fraction of the hydrogen purity can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.95, 0.96, 0.97, 0.98 or 0.99, etc.

[0060] Step 7: After the preset time is reached, the hydrogen embrittled sample 200 is taken out from the first closed container 10.

[0061] By adopting the above scheme, hydrogen embrittled samples 200 with various hydrogen purities can be obtained, such as hydrogen embrittled samples 200 with molar fractions of hydrogen purity of 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.95, 0.96, 0.97, 0.98 or 0.99, respectively.

[0062] Optionally, the inert gas may be nitrogen. Nitrogen itself is stable in nature and will not cause hydrogen damage to the hydrogen embrittled sample 200. Nitrogen also has low cost.

[0063] Optionally, the second air inlet valve 41 may be configured as a stop valve with a pressure sensor, so as to facilitate the introduction of an inert gas of a preset pressure into the first accommodating chamber 10a.

[0064] Please refer to Figure 1 In some embodiments, the hydrogen embrittlement test environment simulation system 100 also includes a heating device and a temperature measuring device 15. The heating device is used to heat the hydrogen to be introduced through the first air inlet 11. The heating device can heat the hydrogen to be introduced into the first containing cavity 10a through the first air inlet 11 by heating the pipeline for transporting the hydrogen. For example, the heating device can be a water bath or a heat exchanger. The heating device can heat the hydrogen to be introduced into the first containing cavity 10a through the first air inlet 11 to different temperatures. For example, the hydrogen to be introduced into the first containing cavity 10a through the first air inlet 11 can be heated to different temperatures by changing the power or flow of the heating device.

[0065] The temperature measuring device 15 is used to measure the temperature in the first accommodation chamber 10a. The temperature measuring device 15 can be a thermometer or a temperature sensor.

[0066] The hydrogen embrittlement test environment simulation system 100 provided in the above embodiment, when used, comprises the following steps:

[0067] In the first step, a hydrogen embrittled sample 200 is provided.

[0068] In the second step, the hydrogen embrittled sample 200 is placed in the first containing cavity 10a, and the first sealed container 10 is closed.

[0069] In the third step, the first receiving chamber 10 a is evacuated using the vacuum device 30 .

[0070] In the fourth step, open the first air inlet valve 21, introduce hydrogen into the first accommodating chamber 10a, and use a heating device to heat the hydrogen passing through the first air inlet 11. When the reading of the temperature measuring device 15 reaches a third preset value, for example, the third preset value can be 50°C, 100°C, 150°C, 200°C, 300°C, 400°C or 500°C, and the reading of the pressure measuring device 12 reaches a fourth preset value, close the first air inlet valve 21.

[0071] Step 5: After the preset time is reached, the hydrogen embrittled sample 200 is taken out from the first containing cavity 10a.

[0072] By adopting the above scheme, hydrogen embrittled samples 200 at various hydrogen temperatures can be obtained, such as hydrogen embrittled samples 200 at hydrogen temperatures of 50°C, 100°C, 150°C, 200°C, 300°C, 400°C or 500°C.

[0073] Optionally, the outer layer of the first sealed container 10 includes a calcium silicate insulation layer, and the inner wall of the first sealed container 10 is composed of high-strength steel to improve the thermal insulation effect of the first sealed container 10.

[0074] In this embodiment, the heating device includes a shell-and-tube heat exchanger 50 and a water vapor assembly 60. The shell-and-tube heat exchanger 50 has a tube-side inlet 51, a tube-side outlet 52, a shell-side inlet 53, and a shell-side outlet 54. The water vapor assembly 60 has a steam outlet 61 and a steam inlet 62. The tube-side inlet 51 is used to communicate with the hydrogen supply device 20, and the tube-side outlet 52 is used to communicate with the first air inlet 11. The steam outlet 61 is connected to the shell-side inlet 53, and the steam inlet 62 is connected to the shell-side outlet 54. In this way, low-temperature hydrogen and high-temperature water vapor can be countercurrently exchanged to improve the heat exchange efficiency.

[0075] Optionally, a delivery pump 63 is provided between the steam outlet 61 of the water steam component 60 and the shell-side inlet 53 to better control the circulation of steam generated by the water steam component 60 between the shell-and-tube heat exchanger 50 and the water steam component 60 .

[0076] Optionally, a third air inlet valve 64 is further provided between the steam outlet 61 of the water steam component 60 and the shell-side inlet 53 to better control the communication between the water steam generated by the water steam component 60 and the shell-and-tube heat exchanger 50 .

[0077] Please refer to Figure 1 In some of the embodiments, the first sealed container 10 is further provided with a third air inlet 16 communicating with the first accommodating cavity 10a.

[0078] The hydrogen embrittlement test environment simulation system 100 further includes a three-way valve 70 , which is connected to the third air inlet 16 , the steam inlet 62 , and the shell outlet 54 , respectively.

[0079] The hydrogen embrittlement test environment simulation system 100 further includes a humidity measuring device 17, which is used to measure the humidity in the first accommodating cavity 10a. The humidity measuring device 17 can be a humidity sensor or a humidity meter.

[0080] The hydrogen embrittlement test environment simulation system 100 provided in the above embodiment, when used, comprises the following steps:

[0081] In the first step, a hydrogen embrittled sample 200 is provided.

[0082] In the second step, the hydrogen embrittled sample 200 is placed in the first containing cavity 10a, and the first sealed container 10 is closed.

[0083] In the third step, the first receiving chamber 10 a is evacuated using the vacuum device 30 .

[0084] Step 4: Adjust the three-way valve 70 so that the third air inlet 16 is connected to the steam inlet 62. After the reading of the humidity measuring device 17 reaches the fifth preset value, for example, the fifth preset value may be 0.01 kg / m 3 , 0.02kg / m 3 , 0.05kg / m 3 , 0.10kg / m 3 , 0.20kg / m 3 or 0.30kg / m 3 etc., and adjust the three-way valve 70 so that the third air inlet 16 and the steam inlet 62 are not connected.

[0085] The fifth step is to open the first air inlet valve 21, introduce hydrogen into the first accommodating chamber 10a, and close the first air inlet valve 21 after the reading of the pressure measuring device 12 reaches a sixth preset value.

[0086] Step 6: After the preset time is reached, the hydrogen embrittled sample 200 is taken out from the first containing cavity 10a.

[0087] By adopting the above scheme, not only can the hydrogen embrittlement specimens 200 under various hydrogen humidity conditions be obtained, such as the hydrogen humidity of 0.01 kg / m 3 , 0.02kg / m 3 , 0.05kg / m 3 , 0.10kg / m 3 , 0.20kg / m 3 or 0.30kg / m 3 The hydrogen embrittlement test specimen 200 is not only improved, but also the utilization rate of the water vapor component 60 is improved, so that the hydrogen embrittlement test environment simulation system 100 requires fewer types and quantities of gas reagents, has high integration, occupies less space, and is more economical and environmentally friendly.

[0088] Optionally, the fifth preset value may be adjusted by adjusting the time during which the third air inlet 16 and the steam inlet 62 are connected.

[0089] Please refer to Figure 1 and Figure 2 In some embodiments, the hydrogen embrittlement test environment simulation system 100 also includes a stress adjustment device 80, which is placed in the first accommodating cavity 10a. The stress adjustment device 80 includes a fixed seat 81 and a movable seat 82 that are relatively arranged. A fixed clamp 83 is arranged on the fixed seat 81, and a movable clamp 84 is arranged on the movable seat 82. The fixed clamp 83 and the movable clamp 84 are respectively used to connect with the opposite ends of the hydrogen embrittlement specimen 200, and the movable clamp 84 can be away from or close to the fixed clamp 83, so that the hydrogen embrittlement specimen 200 is stretched or squeezed by the fixed clamp 83 and the movable clamp 84.

[0090] The hydrogen embrittlement test environment simulation system 100 provided in the above embodiment, when used, comprises the following steps:

[0091] In the first step, a hydrogen embrittled sample 200 is provided.

[0092] In the second step, after connecting the two opposite ends of the hydrogen embrittled sample 200 to the fixed clamp 83 and the movable clamp 84 respectively, the movable clamp 84 is moved away from or close to the fixed clamp 83 so that the hydrogen embrittled sample 200 is stretched or squeezed by the fixed clamp 83 and the movable clamp 84.

[0093] In the third step, the hydrogen embrittled sample 200 and the stress adjustment device 80 are placed in the first containing cavity 10a, and the first sealed container 10 is closed.

[0094] In the fourth step, the first receiving chamber 10a is evacuated using the vacuum device 30 .

[0095] The fifth step is to open the first air inlet valve 21 and introduce hydrogen into the first accommodating chamber 10a. After the reading of the pressure measuring device 12 reaches a preset value, the first air inlet valve 21 is closed.

[0096] Step 6: After the preset time is reached, the hydrogen embrittled sample 200 is taken out from the first containing cavity 10a.

[0097] By adopting the above scheme, a hydrogen embrittled specimen 200 under a single tensile stress or a fixed compressive stress can also be obtained.

[0098] Optionally, both the fixed fixture 83 and the movable fixture 84 may adopt a three-jaw chuck or a similar structure.

[0099] Optionally, the stress adjustment device 80 further includes a support seat 85 , and the fixed seat 81 and the movable seat 82 are both disposed on the support seat 85 to facilitate movement of the entire stress adjustment device 80 .

[0100] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 5 In some embodiments, the movable fixture 84 includes a screw 841 and a clamping piece 842, the screw 841 extends in a direction parallel to the connecting line of the fixed fixture 83 and the movable fixture 84, the screw 841 can be movably passed through the movable seat 82, the clamping piece 842 is connected to one end of the screw 841 close to the fixed fixture 83, and the clamping piece 842 is used to connect with the hydrogen embrittlement specimen 200.

[0101] By adopting the above solution, the hydrogen embrittled sample 200 can be stretched or squeezed by rotating the screw 841, which has a simple structure and is easy to operate.

[0102] Optionally, the clamping member 842 is rotatably connected to one end of the screw rod 841 close to the fixing fixture 83 , and the clamping member 842 and the screw rod 841 cannot move relative to each other along the axial direction of the screw rod 841 .

[0103] In this embodiment, the two opposite ends of the hydrogen embrittlement specimen 200 are provided with test holes 210. The stress adjustment device 80 further includes two pins (not shown in the figure), the fixed fixture 83 is provided with a first limiting groove, the first limiting groove is provided with a first plug hole, the clamping member 842 of the movable fixture 84 is provided with a second limiting groove, the second limiting groove is provided with a second plug hole, the two opposite ends of the hydrogen embrittlement specimen 200 are respectively provided in the first limiting groove and the second limiting groove, one of the pins is inserted in the first plug hole and the test hole 210 at one end of the hydrogen embrittlement specimen 200, and the other pin is inserted in the second plug hole and the test hole 210 at the other end of the hydrogen embrittlement specimen 200, so that the hydrogen embrittlement specimen 200 can be stretched when the screw 841 rotates.

[0104] Please refer to Figure 1 and Figure 3 In another embodiment, a first hanging portion is provided on the fixed fixture 83, and a second hanging portion is provided on the clamping piece 842 of the movable fixture 84. The first hanging portion is inserted into the test hole 210 at one end of the hydrogen embrittlement specimen 200, and the second hanging portion is inserted into the test hole 210 at the other end of the hydrogen embrittlement specimen 200, so that the hydrogen embrittlement specimen 200 can be stretched when the screw 841 rotates, and there is no need to set a pin.

[0105] Please refer to Figure 1 , Figure 2 and Figure 3In some embodiments, the movable clamp 84 also includes a rotating handle 843 and two limit pins 844. One end of the rotating handle 843 is connected to the screw 841, and the rotating handle 843 can rotate together with the screw 841; two limit holes 821 are provided on the movable seat 82, and the two limit pins 844 are respectively inserted into the two limit holes 821, and the two limit pins 844 are respectively located on the opposite sides of the rotating handle 843 to limit the rotation of one end of the rotating handle 843 away from the screw 841 around the screw 841.

[0106] By adopting the above solution, it is possible to avoid that after the hydrogen embrittlement sample 200 is stretched or squeezed by rotating the screw 841, the screw 841 rotates freely, causing the tension or pressure on the hydrogen embrittlement sample 200 to change, thereby affecting the subsequent hydrogen embrittlement test results.

[0107] In some of the embodiments, the hydrogen embrittlement test environment simulation system 100 further includes a stress measuring device (not shown in the figure), which is used to measure the tensile stress or compressive stress exerted on the hydrogen embrittlement specimen 200 after being stretched or squeezed by the fixed fixture 83 and the movable fixture 84.

[0108] The hydrogen embrittlement test environment simulation system 100 provided in the above embodiment, when used, comprises the following steps:

[0109] In the first step, a hydrogen embrittled sample 200 is provided.

[0110] In the second step, after connecting the two opposite ends of the hydrogen embrittled sample 200 to the fixed clamp 83 and the movable clamp 84 respectively, the movable clamp 84 is moved away from or close to the fixed clamp 83 so that the hydrogen embrittled sample 200 is stretched or squeezed by the fixed clamp 83 and the movable clamp 84.

[0111] In the third step, a stress measuring device is used to measure the tensile stress or compressive stress to which the hydrogen embrittled specimen 200 is subjected after being stretched or squeezed by the fixed fixture 83 and the movable fixture 84. For example, the tensile stress may be 110 MPa, 130 MPa, 150 MPa, 2000 MPa or 240 MPa, and the compressive stress may be 100 MPa, 120 MPa, 140 MPa, 180 MPa or 230 MPa, etc.

[0112] In the third step, the hydrogen embrittled sample 200 and the stress adjustment device 80 are placed in the first containing cavity 10a, and the first sealed container 10 is closed.

[0113] In the fourth step, the first receiving chamber 10a is evacuated using the vacuum device 30 .

[0114] The fifth step is to open the first air inlet valve 21 and introduce hydrogen into the first accommodating chamber 10a. After the reading of the pressure measuring device 12 reaches a preset value, the first air inlet valve 21 is closed.

[0115] Step 6: After the preset time is reached, the hydrogen embrittled sample 200 is taken out from the first containing cavity 10a.

[0116] By adopting the above scheme, hydrogen embrittled specimens 200 under various tensile stresses or compressive stresses can also be obtained, such as hydrogen embrittled specimens 200 when the compressive stress is 100 MPa, 120 MPa, 140 MPa, 180 MPa or 230 MPa, and hydrogen embrittled specimens 200 when the tensile stress is 110 MPa, 130 MPa, 150 MPa, 2000 MPa or 240 MPa.

[0117] Optionally, the stress measuring device may adopt a strain gauge, a stress meter or other existing equipment that can test the stress magnitude. When the stress measuring device is used to measure the tensile stress or compressive stress to which the hydrogen embrittled specimen 200 is subjected after being stretched or squeezed by the fixed fixture 83 and the movable fixture 84, the tensile stress or compressive stress to which the hydrogen embrittled specimen 200 is subjected may be calculated by measuring the displacement of the marking point on the hydrogen embrittled specimen 200.

[0118] Optionally, a plurality of limiting holes 821 are provided on the movable seat 82, and the plurality of limiting holes 821 are arranged at intervals around the screw 841, and two limiting pins 844 are respectively inserted into two adjacent limiting holes 821. In this way, the screw 841 can be rotated to different angles first, so that the hydrogen embrittlement specimen 200 is subjected to different tensile stresses or compressive stresses, and then the two limiting pins 844 are inserted into the two limiting holes 821 to limit the rotating handle 843, so as to limit the free rotation of the screw 841, and prevent the free rotation of the screw 841 from causing changes in the tension or pressure on the hydrogen embrittlement specimen 200, thereby affecting the subsequent hydrogen embrittlement test results.

[0119] Please refer to Figure 1 , Figure 2 and Figure 3 An embodiment of the present application provides a hydrogen embrittlement test environment simulation system 100, including a first closed container 10, a hydrogen supply device 20, a pressure measuring device 12, a temperature measuring device 15, a humidity measuring device 17, a vacuum device 30, a second closed container 40, a three-way valve 70, a stress adjustment device 80 and a stress measurement device.

[0120] The first sealed container 10 can be opened and closed. The first sealed container 10 is provided with a first accommodating cavity 10a for placing the hydrogen embrittled sample 200. The first sealed container 10 is provided with a first air inlet 11, a second air inlet 13, a third air inlet 16 and a sampling port 14 which are connected with the first accommodating cavity 10a. The sampling port 14 is provided with an opening and closing valve.

[0121] The pressure measuring device 12 is used to measure the pressure in the first accommodating chamber 10a, the temperature measuring device 15 is used to measure the temperature in the first accommodating chamber 10a, and the humidity measuring device 17 is used to measure the humidity in the first accommodating chamber 10a.

[0122] The vacuum pumping device 30 is in communication with the first accommodating chamber 10 a , and is used for vacuuming the first accommodating chamber 10 a .

[0123] The first air inlet 11 is used to communicate with the hydrogen supply device 20 , and a first air inlet valve 21 is provided between the first air inlet 11 and the hydrogen supply device 20 .

[0124] A second accommodating chamber 40 a is provided in the second sealed container 40 . Nitrogen is provided in the second accommodating chamber 40 a . The second air inlet 13 is communicated with the second accommodating chamber 40 a . A second air inlet valve 41 is provided between the second air inlet 13 and the second sealed container 40 .

[0125] The heating device includes a shell-and-tube heat exchanger 50 and a water vapor component 60. The shell-and-tube heat exchanger 50 has a tube-side inlet 51, a tube-side outlet 52, a shell-side inlet 53 and a shell-side outlet 54. The water vapor component 60 has a steam outlet 61 and a steam inlet 62. The tube-side inlet 51 is used to communicate with the hydrogen supply device 20, and the tube-side outlet 52 is used to communicate with the first air inlet 11. The steam outlet 61 is connected to the shell-side inlet 53, and the steam inlet 62 is connected to the shell-side outlet 54.

[0126] The three-way valve 70 is communicated with the third air inlet 16 , the steam inlet 62 , and the shell-side outlet 54 , respectively.

[0127] The hydrogen embrittlement test environment simulation system 100 also includes a stress adjustment device 80, which is placed inside the first accommodating cavity 10a. The stress adjustment device 80 includes a fixed seat 81 and a movable seat 82 that are relatively arranged. A fixed clamp 83 is arranged on the fixed seat 81, and a movable clamp 84 is arranged on the movable seat 82. The fixed clamp 83 and the movable clamp 84 are respectively used to connect with the opposite ends of the hydrogen embrittlement specimen 200. The movable clamp 84 can be away from or close to the fixed clamp 83, so that the hydrogen embrittlement specimen 200 is stretched or squeezed by the fixed clamp 83 and the movable clamp 84.

[0128] The stress measuring device is used to measure the tensile stress or compressive stress to which the hydrogen embrittlement specimen 200 is subjected after being stretched or squeezed by the fixed fixture 83 and the movable fixture 84 .

[0129] The hydrogen embrittlement test environment simulation system 100 provided in the embodiment of the present application can obtain hydrogen embrittlement specimens 200 with hydrogen-induced hydrogen damage under multiple working conditions such as various hydrogen temperatures, pressures, humidity, pre-stretching and pre-compression and combinations thereof, so as to study the compatibility of hydrogen systems and materials and the hydrogen-induced hydrogen damage mechanism of various metal materials, thereby improving the efficiency of subsequent hydrogen embrittlement detection experiments. In addition, the hydrogen embrittlement test environment simulation system 100 provided in the embodiment of the present application requires fewer types and quantities of gas reagents, has a high degree of integration, occupies less space, and is more economical and environmentally friendly.

[0130] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A hydrogen embrittlement test environment simulation system, characterized in that: include: A first airtight container that can be opened and closed, wherein a first accommodating cavity for placing a hydrogen embrittlement sample is provided inside the first airtight container, a first air inlet communicating with the first accommodating cavity is provided on the first airtight container, the first air inlet is used to communicate with a hydrogen supply device, and a first air inlet valve is provided between the first air inlet and the hydrogen supply device; A vacuum pumping device, the vacuum pumping device is connected to the first accommodating chamber, and the vacuum pumping device is used to vacuum the first accommodating chamber; and A pressure measuring device, the pressure measuring device is used to measure the pressure in the first containing chamber; The hydrogen embrittlement test environment simulation system also includes a second sealed container, in which a second accommodating chamber for accommodating an inert gas is provided; the first sealed container is also provided with a second air inlet and a sampling port, the second air inlet and the sampling port are both connected to the first accommodating chamber, the second air inlet is connected to the second accommodating chamber, a second air inlet valve is provided between the second air inlet and the second sealed container, and an opening and closing valve is provided on the sampling port; The hydrogen embrittlement test environment simulation system further includes a heating device and a temperature measuring device, wherein the heating device is used to heat the hydrogen to be passed through the first air inlet, and the temperature measuring device is used to measure the temperature in the first containing cavity; The heating device comprises a shell-and-tube heat exchanger and a water vapor component, wherein the shell-and-tube heat exchanger has a tube-side inlet, a tube-side outlet, a shell-side inlet and a shell-side outlet, and the water vapor component has a steam outlet and a steam inlet, wherein the tube-side inlet is used to communicate with the hydrogen supply device, the tube-side outlet is used to communicate with the first air inlet, the steam outlet is communicated with the shell-side inlet, and the steam inlet is communicated with the shell-side outlet; The first closed container is also provided with a third air inlet connected to the first accommodating chamber; the hydrogen embrittlement test environment simulation system also includes a three-way valve, which is respectively connected to the third air inlet, the steam inlet and the shell outlet; the hydrogen embrittlement test environment simulation system also includes a humidity measuring device, which is used to measure the humidity in the first closed container.

2. The hydrogen embrittlement test environment simulation system according to claim 1, characterized in that: The hydrogen embrittlement test environment simulation system also includes a stress adjustment device, which is placed in the first accommodating cavity. The stress adjustment device includes a fixed seat and a movable seat that are relatively arranged. The fixed seat is provided with a fixed clamp, and the movable seat is provided with a movable clamp. The fixed clamp and the movable clamp are respectively used to be connected to the opposite ends of the hydrogen embrittlement specimen, and the movable clamp can be away from or close to the fixed clamp, so that the hydrogen embrittlement specimen is stretched or squeezed by the fixed clamp and the movable clamp.

3. The hydrogen embrittlement test environment simulation system according to claim 2, characterized in that: The movable fixture comprises a screw and a clamping piece, wherein the screw extends in a direction parallel to a line connecting the fixed fixture and the movable fixture, the screw is movably arranged on the movable seat, the clamping piece is connected to an end of the screw close to the fixed fixture, and the clamping piece is used to be connected to the hydrogen embrittlement specimen.

4. The hydrogen embrittlement test environment simulation system according to claim 3, characterized in that: The movable clamp also includes a rotating handle and two limit pins, one end of the rotating handle is connected to the screw rod; two limit holes are arranged on the movable seat, and the two limit pins are respectively inserted into the two limit holes, and the two limit pins are respectively located on the opposite sides of the rotating handle to limit the rotation of the rotating handle around the screw rod at one end away from the screw rod.

5. The hydrogen embrittlement test environment simulation system according to claim 2, characterized in that: The hydrogen embrittlement test environment simulation system further comprises a stress measuring device, and the stress measuring device is used to measure the tensile stress or compressive stress to which the hydrogen embrittlement specimen is subjected after being stretched or squeezed by the fixed fixture and the movable fixture.

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