In-situ mechanical property testing system and testing method implemented by using same

Abstract

The invention relates to the field of metal mechanical property testing, in particular to an in-situ mechanical property testing system and a testing method achieved through the in-situ mechanical property testing system. Vacuumizing in the kettle to remove oxygen; cooling circulating water is started; primary atmosphere simulation; simulating a high-temperature environment; continuously filling the atmosphere; setting test parameters and testing; collecting mechanical property data; closing the heating system after the test is finished; discharging gas in the kettle, and closing the cooling water system and the testing system. According to the test system and the test method, the high-temperature hydrogen-related environment can be simulated on the premise of ensuring safety so as to detect the mechanical property change of the metal, and a direct test means is provided for the mechanical property of the metal in the high-temperature and high-pressure hydrogen-mixed environment.

Description

Technical Field

[0001] The invention relates to the field of metal mechanical property testing, and in particular to an in-situ mechanical property testing system and a testing method implemented by using the same. Background Art

[0002] The statements in this section are merely intended to provide background information related to the technical solution of the present application to aid understanding, and they do not necessarily constitute prior art for the technical solution of the present application.

[0003] Wind and solar energy are widely favored because of their cleanliness, pollution-free nature, and mature industrial chain. However, the problem of "abandoning wind and solar power" has caused serious waste of electricity. It is widely believed that hydrogen-blended natural gas technology is one of the effective ways to solve the problem of "abandoning wind and solar power". This technology uses part of the electricity converted from wind / solar energy to electrolyze water to produce hydrogen, and mixes hydrogen into natural gas at a certain ratio to form hydrogen-blended natural gas, which is then transmitted and applied.

[0004] With the continuous development of hydrogen-blended natural gas technology, the pressure and temperature of its application are also gradually changing. Technicians have gradually discovered that compared with the hydrogen mixed environment at room temperature and low pressure, the increase in temperature and pressure of the hydrogen mixed environment will aggravate the hydrogen damage of the metal. There is no direct testing method for characterizing the mechanical properties of metals in high temperature and high pressure hydrogen mixed environment. Summary of the invention

[0005] In order to solve the above problems in the prior art, the present invention aims to provide an in-situ mechanical property testing system for metals in a high-temperature hydrogen-related environment and a corresponding testing method.

[0006] One aspect of the present application relates to an in-situ mechanical property testing system for metals in a high-temperature hydrogen-related environment, which includes: a kettle, a mechanical testing machine, an atmosphere gas source, a nitrogen source, a vacuum pump, a booster pump, an air intake flow meter, a pressure sensor, a heating hood, a temperature sensor, a cooling circulating water machine, a data acquisition device, a hydrogen detector, an oxygen detector, and a gas recovery device; the kettle includes a kettle body, a kettle seat, a gas inlet port, and a gas outlet port, the shell of the kettle body and the kettle seat is a double-layer structure, a cavity is formed in the double-layer structure, and a cooling circulating water inlet and a cooling circulating water outlet are provided on the outer wall of the cavity; the cooling circulating water machine is used to transport cooling circulating water into the cavity of the kettle body and the kettle seat shell; the mechanical testing machine is located in the kettle and is used to test mechanical specimens; the vacuum pump is located next to the mechanical testing machine and is used to evacuate the kettle and discharge gas through the gas outlet of the kettle; the atmosphere gas source is used to store gas required for use in the test environment, and the gas contains hydrogen; the air intake flow meter is connected to the atmosphere gas source and is used to detect the amount of gas filled; the booster pump is connected to the atmosphere gas source through a pipeline and is used to detect the amount of gas filled; The inlet flow meter is connected, the booster pump is used to pressurize the gas from the atmosphere gas source, and then send the pressurized gas into the kettle through the gas inlet of the kettle; the pressure sensor is located between the booster pump and the kettle, and is used for pressure detection; the heating cover is located in the kettle, and is distributed in a cylindrical shape around the mechanical sample placement area; the temperature sensor is located next to the mechanical sample in the kettle, and is used to detect the ambient temperature in the kettle; the hydrogen detector is located in the first branch of the gas discharge pipeline connected to the gas exhaust port of the kettle, and is used to detect the hydrogen content in the kettle after exhaust, so as to ensure the safety of opening the kettle; the oxygen detector is located in the second branch of the gas discharge pipeline connected to the gas exhaust port of the kettle, and is used to detect the oxygen content in the kettle before filling with atmosphere, so as to ensure the safety of the kettle after filling with atmosphere; the gas recovery device is located in the third branch of the gas discharge pipeline connected to the gas exhaust port of the kettle, and is used to collect and process the gas discharged from the kettle; the data acquisition device is located next to the mechanical sample in the kettle, and is used to collect the mechanical properties data of the mechanical sample; the nitrogen source is connected to the gas inlet of the kettle.

[0007] In one embodiment, the atmosphere gas source includes a hydrogen source and a natural gas source, and the intake flowmeter includes a hydrogen intake flowmeter and a natural gas intake flowmeter, which are respectively connected to the hydrogen source and the natural gas source. The hydrogen intake flowmeter is used to detect the amount of hydrogen charged, and the natural gas intake flowmeter is used to detect the amount of natural gas charged.

[0008] In one embodiment, the atmosphere gas source comprises a standard gas source, in which the pre-prepared gas required for use in the test environment is stored.

[0009] In one embodiment, the mechanical testing machine is controlled by an oil source, and the oil source is equipped with an oil source cooling water machine.

[0010] In one embodiment, a sealing groove is provided on the edge of the kettle base, and a sealing gasket is placed in the sealing groove.

[0011] One aspect of the present application relates to a testing method implemented using the in-situ mechanical property testing system, comprising: connecting an atmosphere gas source and a nitrogen gas source respectively; installing a mechanical specimen in a kettle, using a mechanical testing machine to pre-tighten the mechanical specimen, and then lowering the kettle body to tighten and seal it; using a vacuum pump to perform an initial vacuum treatment on the kettle, and then introducing nitrogen into the kettle and exhausting it, repeating the steps of introducing nitrogen and exhausting it until the oxygen content detected by the oxygen detector is lower than a predetermined safety value; starting a cooling circulating water machine to deliver cooling circulating water to the cavity of the kettle body and the kettle base shell; initial atmosphere simulation: filling the kettle with a small amount of gas from the atmosphere gas source; high temperature environment simulation: initial atmosphere simulation After the simulation is completed, turn on the heating cover and heat according to the set heating speed until the set temperature is reached; continue to fill the atmosphere: after reaching the set temperature, keep it for a period of time so that the pressure in the kettle does not change, continue to fill the kettle with gas from the atmosphere gas source until the set final test pressure is reached; set the test parameters and use the mechanical testing machine to test the mechanical specimen; use the data acquisition device to collect the mechanical properties data of the mechanical specimen; turn off the heating cover and rely on cooling circulating water to cool the kettle; introduce nitrogen for exhaust treatment, turn on the hydrogen detector to detect the hydrogen content, and when the hydrogen content detected by the hydrogen detector is lower than the predetermined safety value, close the nitrogen valve and stop the exhaust treatment.

[0012] In one embodiment, the heating mantle is capable of setting the ambient temperature in the reactor to 1000°C or a temperature lower than 1000°C.

[0013] In one embodiment, after the initial atmosphere simulation step is completed, the pressure in the reactor is less than or equal to 1 / 6 of the set final test pressure.

[0014] In one embodiment, the heating rate in the high temperature environment simulation step is 1-10° C. / min.

[0015] In one embodiment, the atmosphere gas source includes a hydrogen source and a natural gas source. The gas filling order in the initial atmosphere simulation step is to first fill natural gas and then hydrogen. The gas filling order in the continued atmosphere filling step is to first fill natural gas and then hydrogen.

[0016] The present invention designs a system and method for in-situ mechanical property testing of metals in a high-temperature hydrogen-related environment, which can simulate actual working conditions (high-temperature hydrogen-related environment) to detect changes in the mechanical properties of metals under the premise of ensuring safety, and provide a direct means of testing the mechanical properties of metals in a high-temperature, high-pressure hydrogen-mixed environment. In addition, by designing the shell of the kettle body and the kettle base as a double-layer structure, and using a cooling circulating water machine to transport cooling circulating water into the cavity of the kettle body and the kettle base shell, the normal operation of the kettle is not affected even when the test temperature in the kettle is as high as 1000°C. By setting a hydrogen detector to detect the hydrogen content in the kettle after exhaust, and setting an oxygen detector to detect the oxygen content in the kettle before filling the atmosphere, the safety of the entire test process and the kettle opening process can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The embodiments of the present invention are further described below with reference to the accompanying drawings, in which:

[0018] Figure 1 A schematic diagram of an in-situ mechanical property testing system for metals in a high-temperature hydrogen-related environment according to one embodiment is shown;

[0019] Figure 2 A schematic diagram showing the shape and size of a test sample according to an embodiment is shown;

[0020] Figure 3 A graph showing the notched tensile performance test results of a metal in a hydrogen-doped natural gas environment according to an embodiment is shown. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail by specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] Figure 1 A schematic diagram of an in-situ mechanical property testing system for metals in a high-temperature hydrogen-related environment according to an embodiment is shown (some components in the kettle are not shown in the figure). The in-situ mechanical property testing system for metals in a high-temperature hydrogen-related environment includes: a kettle, a mechanical testing machine, a hydrogen source, a natural gas source, a nitrogen source, a vacuum pump, a booster pump, an air intake flow meter, a pressure sensor, a heating hood, a temperature sensor, a cooling circulating water machine, a data acquisition device, a hydrogen detector, an oxygen detector, and a gas recovery device.

[0023] The hydrogen source and the natural gas source may be collectively referred to as an atmosphere gas source, which is used to store the gas required for use in the test environment. In the following, the atmosphere gas source including the hydrogen source and the natural gas source is used as an example for explanation, but in other embodiments, the atmosphere gas source may also be a standard gas source, which stores the gas required for use in the test environment that has been prepared in advance.

[0024] The kettle comprises a kettle body, a kettle base, a gas inlet and a gas outlet. The shell of the kettle body and the kettle base is a double-layer structure, a cavity is formed in the double-layer structure, and the outer wall of the cavity is provided with a cooling circulating water inlet and a cooling circulating water outlet. The cooling circulating water machine is used to transport cooling circulating water into the cavity of the kettle body and the kettle base shell to keep the kettle body and the kettle base at room temperature. At the same time, even if the test temperature in the kettle is as high as 1000°C, it will not affect the normal operation of the kettle.

[0025] The mechanical testing machine is located in the kettle and is used to test the mechanical specimens. The vacuum pump is located beside the mechanical testing machine and is used to evacuate the kettle and discharge gas through the gas outlet of the kettle.

[0026] The intake flow meter includes a hydrogen intake flow meter and a natural gas intake flow meter, which are connected to the hydrogen source and the natural gas source respectively. The hydrogen intake flow meter is used to detect the amount of hydrogen charged, and the natural gas intake flow meter is used to detect the amount of natural gas charged.

[0027] The booster pump is connected to the hydrogen intake flow meter and the natural gas intake flow meter through a pipeline. The booster pump is used to pressurize the gas from the gas source, and then send the pressurized gas into the kettle through the gas inlet of the kettle. The pressure sensor is arranged between the booster pump and the kettle for pressure detection.

[0028] The heating cover is located in the kettle and is distributed around the mechanical sample placement area in a cylindrical shape. The temperature sensor is located next to the mechanical sample in the kettle and is used to detect the ambient temperature in the kettle.

[0029] The hydrogen detector is located in the first branch of the gas discharge pipeline connected to the gas discharge port of the kettle, and is used to detect the hydrogen content in the kettle after exhaust to ensure the safety of opening the kettle; the oxygen detector is located in the second branch of the gas discharge pipeline connected to the gas discharge port of the kettle, and is used to detect the oxygen content in the kettle before filling with atmosphere to ensure the safety of the kettle after filling with atmosphere; the gas recovery device is located in the third branch of the gas discharge pipeline connected to the gas discharge port of the kettle, and is used to collect and process the gas discharged from the kettle. The data acquisition device is located next to the mechanical specimen in the kettle, and is used to collect the mechanical properties data of the mechanical specimen. The nitrogen source is connected to the gas inlet of the kettle. The oxygen detector and the hydrogen detector can be located in the middle section of the gas circuit of the test system, and are used to detect whether there is gas residue in the gas circuit to ensure the safety of the test process and the kettle opening process.

[0030] In one embodiment, the mechanical testing machine is controlled by an oil source, and the oil source is equipped with an oil source cooling water machine.

[0031] In one embodiment, a sealing groove is provided on the edge of the kettle seat, and its material can be one of stainless steel materials. A sealing gasket is placed in the sealing groove, and the kettle body can be locked by 10-14 locking bolts after it falls.

[0032] In one embodiment, the in-situ mechanical property testing system further comprises a back pressure valve, which is located at the rear end of the kettle and is used to quickly release excess pressure when the pressure in the kettle is too high.

[0033] According to one embodiment, a testing method implemented using the in-situ mechanical properties testing system comprises the following steps:

[0034] Connect the hydrogen source, natural gas source and nitrogen source respectively;

[0035] A mechanical specimen is installed in the kettle, and the mechanical specimen is pre-tightened using a mechanical testing machine, and then the kettle body is lowered to be tightened and sealed;

[0036] Using a vacuum pump to perform an initial vacuum treatment on the kettle, then introducing nitrogen into the kettle and emptying it, repeating the steps of introducing nitrogen and emptying it until the oxygen content detected by the oxygen detector is lower than a predetermined safety value;

[0037] Turn on the cooling circulating water machine to deliver cooling circulating water into the cavity of the kettle body and the kettle base shell;

[0038] Initial atmosphere simulation: a small amount of natural gas and a small amount of hydrogen are charged into the kettle according to the set ratio;

[0039] High temperature environment simulation: After the initial atmosphere simulation is completed, turn on the heating cover and heat it at the set heating speed until the set temperature is reached. After reaching the set temperature, it can be left to stand for a period of time;

[0040] Continue to fill the atmosphere: After reaching the set temperature and maintaining it for a period of time so that the pressure in the kettle does not change, continue to fill the kettle with natural gas and hydrogen until the set final test pressure is reached;

[0041] Setting test parameters and using a mechanical testing machine to test mechanical specimens. In one embodiment, the test system can perform a variety of mechanical property tests, for example, setting the load force and displacement loading rate to perform a slow strain rate tensile test, setting the load force, test frequency and loading rate to perform a fatigue life test, setting the load force and loading rate to perform a crack growth rate test, etc., and can set test parameters accordingly according to different mechanical property tests for testing;

[0042] Using a data collector to collect the mechanical properties data of the mechanical sample, in this step, a program can be run to allow the system to automatically collect the mechanical data;

[0043] Turn off the heating hood and use cooling circulating water to cool down the kettle;

[0044] Introduce nitrogen for exhaust treatment, open the valve of the branch where the hydrogen detector is located, detect the hydrogen content, and when the hydrogen content detected by the hydrogen detector is lower than the predetermined safety value, close the nitrogen valve and stop the exhaust treatment.

[0045] In one embodiment, the heating hood can set the ambient temperature in the kettle to 1000°C or a temperature lower than 1000°C. In one embodiment, nitrogen is introduced into the kettle and emptied to remove oxygen for multiple cycles until the oxygen content in the kettle is lower than a predetermined safety value. In one embodiment, the cooling circulation water flow rate is 25 to 50 L / min. In one embodiment, the order of gas filling in the initial atmosphere simulation step is to first fill natural gas and then hydrogen. After the filling is completed, the pressure in the kettle is less than or equal to 1 / 6 of the set final test pressure, and the amount of gas filled can be calculated by the intake flow meter. In one embodiment, the heating rate in the high temperature environment simulation step is 1 to 10°C / min. In one embodiment, the order of continuing to fill natural gas and hydrogen after the pressure in the kettle does not change is to first fill natural gas and then hydrogen, and the filling speed is as slow as possible. In one embodiment, when pre-tensioning using a mechanical testing machine, the tensioning force value is less than 1000N.

[0046] In one embodiment, after sealing is completed, a vacuum pump is used to perform an initial vacuuming treatment. When the vacuum degree reaches a certain value, the vacuuming is turned off, the nitrogen valve is opened to allow nitrogen to be exhausted, the oxygen detector branch valve is opened, and the oxygen content in the system is detected. The vacuuming and nitrogen exhausting steps are repeated until the oxygen detector detects that the oxygen content in the system is lower than a predetermined safety value, then the operation is stopped to complete the vacuuming and oxygen removal steps.

[0047] In one embodiment, when the cooling circulating water is turned on, check whether the amount of cooling water in the cooling circulating water machine is lower than the set lower limit, replenish cooling water in time, check whether there are leaks at the joints of the cooling water pipe, and keep the cooling circulating water turned on during the test.

[0048] In one embodiment, the gas inlet of the kettle comprises at least two gas inlets, one of which is for the nitrogen source and the other is for the atmosphere source. In one embodiment, the nitrogen source and the atmosphere source may share a gas inlet.

[0049] In the above, the atmosphere gas source including a hydrogen source and a natural gas source is used as an example for explanation, but it can be understood that when the atmosphere gas source is a standard gas source (the standard gas source stores pre-prepared gases required for use in a test environment), the above system and method can be adjusted accordingly, which is still within the scope of the disclosure of the present invention.

[0050] Example:

[0051] Turn on the oil source and the oil source cooling water machine, place the mechanical properties test sample and pre-tighten it. The pre-tightening force value reaches 500N, and adjust the position of the temperature sensor so that it is located in the center section of the mechanical specimen.

[0052] Open the vacuum check valve, turn on the vacuum pump to vacuum, and the vacuum degree reaches 10 -2 When the pressure reaches 400 bar, close the one-way valve and the vacuum pump, open the nitrogen gas source inlet valve, and pass nitrogen for 8 minutes. After the end, close the nitrogen gas source inlet valve to continue vacuuming, and then pass nitrogen again. Repeat this step twice, observe the value of the oxygen detector. When the value is lower than 0.2%, close the nitrogen gas source inlet valve and vacuumize again.

[0053] Check whether the amount of cooling water in the cooling water circulation machine is lower than the set lower limit, check whether there are leaks at the joints of the cooling water pipes, turn on the cooling water circulation machine, and the cooling water circulation speed is 30L / min.

[0054] Turn on the booster pump and open the gas source one-way valve, fill in a small amount of gas from the atmosphere gas source, and set the boosted pressure to 30Mpa.

[0055] When the pressure in the kettle reaches 0.5Mpa, close the gas source one-way valve, set the heating rate to 10℃ / min, heat to 1000℃ and let it stand for a while, and observe that the internal pressure of the system reaches 2.3Mpa.

[0056] Open the gas source one-way valve and continue to slowly fill in the gas from the atmosphere gas source. When the system pressure reaches 3Mpa, close the gas source one-way valve.

[0057] Set the test parameters, the test content is notched tensile performance test, the loading mode is displacement control, the displacement speed is 0.05mm / min, the test temperature is 1000℃, the pressure is 3Mpa, the test sample shape and size are as follows Figure 2 shown.

[0058] After the test is completed, turn off the heating, keep the cooling circulating water on to cool down, open the single valve at the air outlet, pass nitrogen to discharge the gas, observe the hydrogen detector and show that the hydrogen content is lower than 0.2%, wait until the temperature in the kettle drops to room temperature, then turn off the circulating water, remove the locking bolts, raise the kettle body and take out the sample.

[0059] After the third vacuuming is completed, the oxygen detector in the pipeline shows a value lower than the preset safety value, and the system can operate safely;

[0060] During the test, there was no leakage of hydrogen;

[0061] During the test, the temperature in the kettle was stabilized at 1000°C, with a temperature difference of 1°C;

[0062] During the test, the pressure in the kettle was stabilized at the test pressure of 3Mpa;

[0063] During the test, the temperature of the kettle body and kettle base was detected by infrared temperature detector to be room temperature;

[0064] There is no leakage of circulating water during the test;

[0065] The notched tensile properties test results of metals in hydrogen-doped natural gas environment are as follows: Figure 3 shown.

[0066] References herein to "various embodiments," "some embodiments," "one embodiment," or "an embodiment," etc. refer to a particular feature, structure, or property described in conjunction with the embodiment being included in at least one embodiment. Thus, the appearances of the phrases "in various embodiments," "in some embodiments," "in one embodiment," or "in an embodiment," etc., throughout this document do not necessarily refer to the same embodiment. Furthermore, particular features, structures, or properties may be combined in any suitable manner in one or more embodiments. Thus, particular features, structures, or properties shown or described in conjunction with one embodiment may be combined in whole or in part with features, structures, or properties of one or more other embodiments without restriction, as long as the combination is not illogical or inoperable.

[0067] Expressions similar to "according to A", "based on A", "through A" or "using A" appearing in this document are intended to be non-exclusive, that is, "according to A" may include "only according to A" or "according to A and B", unless it is specifically stated that its meaning is "only according to A". In this application, for the sake of clarity, some schematic operating steps are described in a certain order, but those skilled in the art will understand that each of these operating steps is not essential, and some of the steps may be omitted or replaced by other steps. These operating steps do not have to be performed sequentially in the manner shown. On the contrary, some of these operating steps may be performed in different orders or in parallel according to actual needs, as long as the new execution method is not illogical or inoperable.

[0068] Having thus described several aspects of at least one embodiment of the present invention, it will be appreciated that various changes, modifications and improvements will readily occur to those skilled in the art. Such changes, modifications and improvements are intended to be within the spirit and scope of the present invention. Although the present invention has been described by way of some embodiments, the present invention is not limited to the embodiments described herein, and also includes various changes and variations made without departing from the scope of the present invention.

Claims

1. An in-situ mechanical properties testing system for metals in a high-temperature hydrogen-related environment, characterized in that: The in-situ mechanical properties testing system includes: a kettle, a mechanical testing machine, an atmosphere gas source, a nitrogen source, a vacuum pump, a booster pump, an air intake flow meter, a pressure sensor, a heating cover, a temperature sensor, a cooling circulating water machine, a data acquisition device, a hydrogen detector, an oxygen detector, and a gas recovery device; The kettle comprises a kettle body, a kettle base, a gas inlet and a gas outlet, the shell of the kettle body and the kettle base is a double-layer structure, a cavity is formed in the double-layer structure, and the outer wall of the cavity is provided with a cooling circulating water inlet and a cooling circulating water outlet; The cooling circulating water machine is used to deliver cooling circulating water to the cavity of the kettle body and the kettle base shell; The mechanical testing machine is located in the kettle and is used to test the mechanical specimens; The vacuum pump is located beside the mechanical testing machine and is used to evacuate the kettle and discharge gas through the gas outlet of the kettle; The atmosphere gas source is used to store the gas required for use in the test environment, and the gas contains hydrogen; The air intake flow meter is connected to the atmosphere gas source and is used to detect the amount of the gas charged; The booster pump is connected to the air intake flow meter through a pipeline, and the booster pump is used to pressurize the gas from the atmosphere gas source, and then send the pressurized gas into the kettle through the gas inlet of the kettle; The pressure sensor is located between the booster pump and the kettle and is used for pressure detection; The heating cover is located in the kettle and is distributed around the mechanical sample placement area in a cylindrical shape; The temperature sensor is located next to the mechanical specimen in the kettle and is used to detect the ambient temperature in the kettle; The hydrogen detector is located in the first branch of the gas exhaust pipeline connected to the gas exhaust port of the kettle, and is used to detect the hydrogen content in the kettle after exhaust to ensure the safety of opening the kettle; The oxygen detector is located in the second branch of the gas discharge pipeline connected to the gas discharge port of the kettle, and is used to detect the oxygen content in the kettle before the atmosphere is filled in, so as to ensure the safety of the kettle after the atmosphere is filled in; The gas recovery device is located in the third branch of the gas discharge pipeline connected to the gas discharge port of the kettle, and is used to collect and process the gas discharged from the kettle; The data collector is located next to the mechanical sample in the kettle and is used to collect mechanical property data of the mechanical sample; The nitrogen source is connected to the gas inlet port of the kettle.

2. The in-situ mechanical properties testing system according to claim 1, wherein: The atmosphere gas source includes a hydrogen source and a natural gas source, and the intake flowmeter includes a hydrogen intake flowmeter and a natural gas intake flowmeter, which are connected to the hydrogen source and the natural gas source respectively. The hydrogen intake flowmeter is used to detect the amount of hydrogen charged, and the natural gas intake flowmeter is used to detect the amount of natural gas charged.

3. The in-situ mechanical properties testing system according to claim 1, wherein: The atmosphere gas source comprises a standard gas source, in which the pre-prepared gas required for use in the test environment is stored.

4. The in-situ mechanical properties testing system according to claim 1, wherein: The mechanical testing machine is controlled by an oil source, and the oil source is equipped with an oil source cooling water machine.

5. The in-situ mechanical properties testing system according to claim 1, wherein: A sealing groove is arranged at the edge of the kettle seat, and a sealing gasket is placed in the sealing groove.

6. A testing method implemented by using the in-situ mechanical properties testing system according to any one of claims 1 to 5, comprising: Connect the atmosphere gas source and nitrogen gas source respectively; A mechanical specimen is installed in the kettle, and the mechanical specimen is pre-tightened using a mechanical testing machine, and then the kettle body is lowered to be tightened and sealed; Using a vacuum pump to perform an initial vacuum treatment on the kettle, then introducing nitrogen into the kettle and emptying it, repeating the steps of introducing nitrogen and emptying it until the oxygen content detected by the oxygen detector is lower than a predetermined safety value; Turn on the cooling circulating water machine to deliver cooling circulating water into the cavity of the kettle body and the kettle base shell; Initial atmosphere simulation: a small amount of gas from the atmosphere gas source is charged into the kettle; High temperature environment simulation: After the initial atmosphere simulation is completed, turn on the heating cover and heat at the set heating speed until the set temperature is reached; Continue to charge the atmosphere: after reaching the set temperature and maintaining it for a period of time so that the pressure in the kettle does not change, continue to charge the gas from the atmosphere gas source into the kettle until the set final test pressure is reached; Set test parameters and use mechanical testing machine to test mechanical specimens; Using a data collector to collect mechanical property data of the mechanical sample; Turn off the heating cover and use cooling circulating water to cool down the kettle; Introduce nitrogen for exhaust treatment, turn on the hydrogen detector to detect the hydrogen content, and when the hydrogen content detected by the hydrogen detector is lower than the predetermined safety value, close the nitrogen valve and stop the exhaust treatment.

7. The testing method according to claim 6, wherein: The heating mantle can set the ambient temperature in the kettle to 1000°C or a temperature lower than 1000°C.

8. The testing method according to claim 6, wherein: After the initial atmosphere simulation step is completed, the pressure in the kettle is less than or equal to 1 / 6 of the set final test pressure.

9. The testing method according to claim 6, wherein: The heating rate in the high temperature environment simulation step is 1 to 10° C. / min.

10. The testing method according to claim 6, wherein: The atmosphere gas source includes a hydrogen source and a natural gas source. The gas filling order in the initial atmosphere simulation step is to first fill natural gas and then hydrogen. The gas filling order in the continued atmosphere filling step is to first fill natural gas and then hydrogen.

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