Tubular sample dynamic liquid lead bismuth alloy loop corrosion fatigue test device and use method

Abstract

The invention relates to the field of fatigue tests, in particular to a tubular sample dynamic liquid lead bismuth alloy loop corrosion fatigue test device and a use method. The tubular sample is installed between the upper base and the lower base, the lower end of the tubular sample is sequentially communicated with the through hole in the lower base and the liquid lead-bismuth alloy inlet pipe, and the upper end of the tubular sample is sequentially communicated with the through hole in the upper base and the liquid lead-bismuth alloy outlet pipe. A thermocouple is attached outside the tubular sample to monitor and control the temperature of liquid lead bismuth in real time, and an extensometer is installed on the outer surface to measure strain. Liquid lead bismuth is driven by the electromagnetic pump through the storage kettle, enters the reaction kettle for heating and oxygen control, flows into the tubular sample after the flow velocity is measured through the flowmeter, and then flows back to the storage kettle to form a loop. Armored electric heat tracing and heat preservation cotton is arranged on the outer wall of the loop pipeline, and temperature control is ensured. Accurate control over the temperature, the dissolved oxygen and the flow speed of the high-temperature liquid lead bismuth is achieved, a dynamic strain control fatigue test is supported, and the corrosion fatigue performance of the material in the flowing high-temperature liquid lead bismuth environment is evaluated.

Description

Technical Field

[0001] The present invention relates to the field of fatigue testing, and specifically to a tubular specimen dynamic liquid lead-bismuth alloy loop corrosion fatigue testing device and a use method thereof, which are used for strain-controlled low-cycle fatigue testing of tubular specimens in a dynamic liquid lead-bismuth alloy loop to evaluate the corrosion fatigue performance of structural materials under the action of dynamic liquid lead-bismuth alloy. Background Art

[0002] Lead-cooled fast reactors are one of the most promising fourth-generation fast reactors due to their inherent high safety, long life, miniaturization, high power density and ability to burn nuclear waste. One of the bottleneck issues currently restricting the development of lead-cooled fast reactors is the environmental compatibility of lead-bismuth eutectic and structural materials. A large number of studies have shown that liquid metal corrosion and liquid metal embrittlement will occur in structural materials in a high-temperature liquid lead-bismuth alloy environment, significantly reducing the fatigue strength of structural materials and easily inducing corrosion fatigue cracks. Once the corrosion fatigue cracks penetrate the wall thickness of the service component and leak or break instantly, the consequences are disastrous, seriously affecting the economy and safety of nuclear power operation.

[0003] Under actual working conditions, the interior of the lead-cooled fast reactor container is filled with flowing high-temperature liquid lead-bismuth alloy, while the existing fatigue test equipment in liquid lead-bismuth alloy environments mainly focuses on test equipment in static environments, which is difficult to meet the testing requirements for the interaction between flowing liquid lead-bismuth alloy and mechanical factors under actual working conditions.

[0004] At present, the patent "A dynamic mechanical properties test device in a high-temperature lead-bismuth environment (publication number CN 117470693)" realizes the dynamic mechanical properties test in a high-temperature liquid lead-bismuth environment in a static reactor by rotating the sample. However, the flow rate generated by the rotating sample is not consistent, and in the actual operation process, the flow rate on the sample surface is difficult to accurately control. Therefore, in response to the above problems, the present invention develops a fatigue test device for tubular samples in a dynamic liquid lead-bismuth alloy loop, which is used to study the low-cycle fatigue behavior of key equipment structural materials of lead-cooled fast reactors in a simulated service environment (flow, high temperature, oxygen control). Summary of the invention

[0005] The purpose of the present invention is to provide a tubular specimen dynamic liquid lead-bismuth alloy loop corrosion fatigue test device and use method, so as to realize low-cycle fatigue test of tubular specimens in a flowing liquid lead-bismuth alloy environment.

[0006] The technical solution of the present invention is:

[0007] A tubular sample dynamic liquid lead-bismuth alloy loop corrosion fatigue test device, wherein a storage kettle is filled with liquid lead-bismuth alloy, the storage kettle is connected to the inner cavity of a first reactor through a first loop pipeline, one end of the first loop pipeline is connected to the lower part of the inner cavity of the kettle body of the storage kettle, the other end of the first loop pipeline passes through the kettle cover of the first reactor and extends to the upper part of the inner cavity of the kettle body of the first reactor, and a first liquid lead-bismuth alloy valve and a liquid metal electromagnetic pump are arranged on the first loop pipeline; the storage kettle is also connected to the second reactor through a pipeline, one end of the pipeline passes through the kettle cover of the storage kettle and extends to the upper part of the inner cavity of the kettle body of the storage kettle The other end of the pipeline passes through the bottom of the kettle body of the second reactor and extends to the lower part of the inner cavity of the kettle body of the second reactor; the bottom of the first reactor is connected with the second loop pipeline through a pipeline, and a liquid metal flowmeter is provided on the pipeline. The second loop pipeline is connected with the lower end of the through-hole of the tubular sample through the third liquid lead-bismuth alloy valve and the liquid lead-bismuth alloy inlet pipe on a branch loop, and the second loop pipeline is connected with the upper end of the through-hole of the tubular sample through the fourth liquid lead-bismuth alloy valve and the liquid lead-bismuth alloy outflow pipe on another branch loop, and the second loop pipeline is connected with the second reactor through the main loop.

[0008] The tubular specimen dynamic liquid lead-bismuth alloy loop corrosion fatigue test device is provided with a storage kettle air inlet and a storage kettle air outlet on the kettle cover of the storage kettle, one end of the storage kettle air inlet extends to the outside of the kettle cover of the storage kettle, and the other end of the storage kettle air inlet passes through the kettle cover of the storage kettle and extends to the liquid lead-bismuth alloy in the lower part of the inner cavity of the kettle body of the storage kettle; one end of the storage kettle air outlet extends to the outside of the kettle cover of the storage kettle, and the other end of the storage kettle air outlet passes through the kettle cover of the storage kettle and extends to the upper part of the liquid lead-bismuth alloy in the inner cavity of the storage kettle.

[0009] In the tubular specimen dynamic liquid lead-bismuth alloy loop corrosion fatigue test device, an oxygen-controlled mixed gas inlet, an oxygen-controlled mixed gas outlet, and a dissolved oxygen electrode are provided on the kettle cover of the first reactor, wherein: one end of the oxygen-controlled mixed gas inlet extends to the outside of the first reactor, one end of the oxygen-controlled mixed gas inlet is connected to the oxygen-controlled mixed gas bottle through a pipeline and an oxygen-controlled solenoid valve on the pipeline, and the other end of the oxygen-controlled mixed gas inlet passes through a channel on the first reactor and extends to the lower part of the inner cavity of the first reactor; one end of the oxygen-controlled mixed gas outlet extends to the outside of the first reactor, and the other end of the oxygen-controlled mixed gas outlet passes through the channel on the first reactor and extends to the upper part of the inner cavity of the first reactor; the upper end of the dissolved oxygen electrode extends to the top of the kettle cover of the first reactor, and the lower end of the dissolved oxygen electrode extends to the middle of the inner cavity of the kettle body of the first reactor, and the oxygen control system controller is respectively connected to the oxygen-controlled solenoid valve and the dissolved oxygen electrode through lines.

[0010] The tubular specimen dynamic liquid lead-bismuth alloy loop corrosion fatigue test device is characterized in that a second reactor is provided with a second reactor gas outlet, one end of the second reactor gas outlet extends to the outside of the reactor cover of the second reactor, and the other end of the second reactor gas outlet passes through the reactor cover of the second reactor and extends to the upper part of the inner cavity of the reactor body of the second reactor; one end of the main loop of the second loop pipeline passes through the reactor cover of the second reactor and extends to the upper part of the inner cavity of the reactor body of the second reactor, and the other end of the main loop of the second loop pipeline is connected to the liquid metal flowmeter through a pipeline.

[0011] The tubular sample dynamic liquid lead-bismuth alloy circuit corrosion fatigue test device, the second circuit pipeline is a combination of a main circuit and two branch circuits, the main circuit is vertically connected to the two branch circuits, the main circuit is provided with a second liquid lead-bismuth alloy valve, and the two branch circuits are respectively provided with a third liquid lead-bismuth alloy valve and a fourth liquid lead-bismuth alloy valve; one end of the liquid lead-bismuth alloy inlet tube is connected to the lower end of the tubular sample through hole, and the other end of the liquid lead-bismuth alloy inlet tube is connected to a branch circuit through a first sealing joint; one end of the liquid lead-bismuth alloy outflow tube is connected to the upper end of the tubular sample through hole, and the other end of the liquid lead-bismuth alloy outflow tube is connected to another branch circuit through a second sealing joint.

[0012] The tubular specimen dynamic liquid lead-bismuth alloy loop corrosion fatigue test device, the external shape and size of the tubular specimen gauge section are designed according to the standard rod-shaped fatigue specimen, the interior of the tubular specimen is a through hole, and the wall thickness of the gauge section is 2 to 5 mm; steps with clamping function are arranged at both ends of the tubular specimen, the through hole is a cylindrical hole located in the middle, and a conical hole and a threaded hole are formed by symmetrically arranged V-shaped sealing surfaces at both ends of the cylindrical hole, and the cylindrical hole located in the middle of the through hole is transitionally connected with the threaded hole located on the outside through the V-shaped sealing surface.

[0013] The dynamic liquid lead-bismuth alloy loop corrosion fatigue test device for tubular specimens is described, and the two ends of the tubular specimen are respectively sealed and connected to the sealing plugs through matching clamping bolts. The sealing plugs are two symmetrically arranged at the upper and lower ends of the tubular specimen. The sealing plug is a structure with a cylindrical part and a cylindrical step on its head. The outer end face of the cylindrical step at one end of each sealing plug corresponds to the V-shaped sealing surface of the internal through hole of the tubular specimen and is matched with the V-shaped sealing surface through a chamfer. The clamping bolt is a stepped cylindrical structure, and its smaller diameter part has an external thread. The smaller diameter part of the clamping bolt corresponds to and matches the threaded hole of the internal through hole of the tubular specimen. The center of the clamping bolt has a through hole, so that the clamping bolt is sleeved on the cylindrical part of the sealing plug, and the smaller diameter end of the clamping bolt corresponds to and is in close contact with the inner end face of the cylindrical step of the sealing plug. After the sealing plug is matched with the clamping bolt, the clamping bolt is connected to the threaded hole of the tubular specimen through the external thread.

[0014] The tubular specimen dynamic liquid lead-bismuth alloy circuit corrosion fatigue test device has a sealing plug with a through hole inside, the other end of the lower sealing plug is connected to one end of the liquid lead-bismuth alloy inlet pipe through the lower through hole in the lower base by a threaded seal, and the other end of the upper sealing plug is connected to one end of the liquid lead-bismuth alloy outflow pipe through the upper through hole in the upper base by a threaded seal, so as to achieve connection with the second circuit pipeline of the dynamic liquid lead-bismuth alloy, and the liquid lead-bismuth alloy inlet pipe and the liquid lead-bismuth alloy outflow pipe are wrapped with armored electric heating and wrapped with thermal insulation cotton.

[0015] The tubular sample dynamic liquid lead-bismuth alloy loop corrosion fatigue test device has a thermocouple attached to the outer surface of the gauge section of the tubular sample to monitor / control the temperature of the liquid lead-bismuth alloy flowing through the tubular sample in real time; the tubular sample is installed on the fatigue fixture of the fatigue testing machine through the upper base and the lower base. After the tubular sample is installed on the fatigue testing machine, a strain extensometer is installed on the outer surface of the gauge section of the tubular sample, and the strain extensometer is connected to the fatigue testing machine to monitor / control the strain of the gauge section of the tubular sample during the fatigue test in real time;

[0016] Install the matched sealing plug and the clamping bolt on the threaded hole of the tubular sample. By tightening the clamping bolt, vertically squeeze the sealing plug so that the head of the sealing plug contacts the V-shaped sealing surface of the tubular sample to form a hard seal. After tightening, the sealing effect is achieved. After the seal is installed, the flow rate can reach 0-4m / s, the temperature can reach 300-550℃, and the oxygen concentration can reach saturated oxygen to 10 -8 wt.% controlled liquid lead-bismuth alloy corrosion fatigue test.

[0017] The method for using the tubular sample dynamic liquid lead-bismuth alloy loop corrosion fatigue test device comprises the following steps:

[0018] (1) The clamping bolt is sleeved on the sealing plug, and the combination structure of the clamping bolt and the sealing plug is installed at the threaded holes at both ends of the tubular specimen. The clamping bolt is tightened to form a hard seal between the heads of the upper and lower sealing plugs and the V-shaped sealing surface of the tubular specimen. At the same time, the fatigue fixture of the fatigue testing machine is used to clamp the tubular specimen through the upper base and the lower base;

[0019] (2) The liquid lead-bismuth alloy inlet pipe is connected to the first sealing joint of the second loop pipeline by threads, and the liquid lead-bismuth alloy outlet pipe is connected to the second sealing joint of the second loop pipeline by threads, so as to achieve connection with the dynamic liquid lead-bismuth alloy loop;

[0020] (3) The liquid lead-bismuth alloy inlet pipe and the liquid lead-bismuth alloy outlet pipe are wrapped with armored electric heating and wrapped with thermal insulation cotton, and powered for heating; a thermocouple is attached to the surface of the tubular sample, and an extensometer is clamped on the tubular sample;

[0021] (4) The first loop pipeline is wrapped with armored electric heating and wrapped with insulation cotton, and the power supply and temperature control are set to 400°C. The control cabinet supplies power and temperature control to the storage kettle, the first reactor and the second reactor through the line. The liquid lead-bismuth alloy is placed in the storage kettle and heated and temperature controlled as the storage kettle melts. The liquid metal electromagnetic pump is powered and a voltage of 150V±30V is applied to make the liquid metal electromagnetic pump run idle, and the internal pipeline of the liquid metal electromagnetic pump is heated to 400°C.

[0022] (5) When the temperature of the storage kettle, the loop pipeline, the internal pipeline of the liquid metal electromagnetic pump, the first reactor and the second reactor is greater than 350° C., the first liquid lead-bismuth alloy valve is opened, the other liquid lead-bismuth alloy valves are closed, and high-purity argon gas is passed through the gas inlet of the storage kettle to make the liquid lead-bismuth alloy in the storage kettle flow along the pipeline into the liquid metal electromagnetic pump, thereby meeting the start-up requirements of the liquid metal electromagnetic pump;

[0023] (6) closing the air inlet of the storage kettle, opening the air outlet of the storage kettle, depressurizing the storage kettle, and then closing the air outlet of the storage kettle, opening the first liquid lead-bismuth alloy valve, setting the voltage of the liquid metal electromagnetic pump control cabinet to 250V, and the liquid lead-bismuth alloy in the pipe begins to flow, and the liquid metal flow meter displays the real-time flow rate, forming a dynamic liquid lead-bismuth alloy loop;

[0024] (7) turning on the oxygen control system controller to control the air intake of the oxygen control solenoid valve to achieve oxygen control of the liquid lead-bismuth alloy in the inner cavity of the first reactor;

[0025] (8) opening two liquid lead-bismuth alloy valves on the branch circuit leading to the fatigue testing machine, closing the first liquid lead-bismuth alloy valve, and allowing the liquid lead-bismuth alloy to flow through the tubular specimen, so that a fatigue test of the tubular specimen in a dynamic liquid lead-bismuth alloy environment can be carried out;

[0026] (9) After the fatigue test is completed, the power supply of the liquid metal electromagnetic pump is turned off, and high-purity argon gas is introduced into the oxygen-controlled mixed gas inlet, so that the liquid lead-bismuth alloy in the first reactor, the tubular sample, the first loop pipeline, and the second loop pipeline enters the second reactor, and then is blown back to the storage reactor through the pipeline connecting the second reactor and the storage reactor, so as to realize the recovery of the liquid lead-bismuth alloy and disassemble the fatigue sample under normal temperature and air conditions.

[0027] The design concept of the present invention is:

[0028] The tubular specimen of the present invention is installed between the upper and lower bases, and the lower end of the tubular specimen is connected with the inner through hole of the lower base and the inlet tube of the liquid lead-bismuth alloy in sequence, and the upper end of the tubular specimen is connected with the inner through hole of the upper base and the outlet tube of the liquid lead-bismuth alloy in sequence. A thermocouple is attached to the outside of the tubular specimen to monitor and control the temperature of the liquid lead-bismuth in real time, and an extensometer is installed on the outer surface to measure the strain. The liquid lead-bismuth is driven by an electromagnetic pump through the storage kettle, enters the reactor for heating and oxygen control, flows into the tubular specimen after the flow rate is measured by a flowmeter, and then flows back to the storage kettle to form a loop. The outer wall of the loop pipeline is equipped with armored electric heating and thermal insulation cotton to ensure temperature control. The present invention realizes precise control of the temperature, dissolved oxygen and flow rate of high-temperature liquid lead-bismuth, supports dynamic strain control fatigue testing, and evaluates the corrosion fatigue performance of materials in a flowing high-temperature liquid lead-bismuth environment.

[0029] The advantages and beneficial effects of the present invention are:

[0030] 1. The present invention provides a tubular specimen dynamic liquid lead-bismuth alloy circuit corrosion fatigue test device and a method for use thereof, rationally designs a dynamic liquid lead-bismuth alloy circuit, skillfully combines the dynamic liquid lead-bismuth alloy circuit with a low-cycle fatigue experimental device, and realizes a low-cycle fatigue test of a tubular specimen in a dynamic (0-4 m / s) liquid lead-bismuth alloy circuit.

[0031] 2. The device of the present invention connects the dynamic liquid lead-bismuth alloy loop and the tubular fatigue sample through a conducting tube. After the test is completed, the liquid lead-bismuth alloy in the tubular sample can be transferred back to the storage kettle by pressing argon gas, which is convenient for loading and unloading fatigue samples in normal temperature air. The operation is simple and convenient and does not contact the lead-bismuth alloy vapor. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a diagram of the low-cycle fatigue experimental device and the dynamic liquid lead-bismuth alloy circuit structure.

[0033] Figure 2 Schematic diagram of the installation of tubular specimens in fatigue testing machine.

[0034] Figure 3 Schematic diagram of tubular specimen.

[0035] Figure 4 This is a schematic diagram of the installation at the upper end of the tubular specimen.

[0036] In the figure: 1 storage kettle; 2 first liquid lead-bismuth alloy valve; 3 liquid metal electromagnetic pump; 4 first reactor; 5 liquid metal flowmeter; 6 fatigue testing machine; 7 second reactor; 8 storage kettle gas outlet; 9 storage kettle gas inlet; 10 liquid lead-bismuth alloy; 11 oxygen-controlled mixed gas inlet; 12 oxygen-controlled mixed gas outlet; 13 dissolved oxygen electrode; 14 oxygen-controlled electromagnetic valve; 15 oxygen-controlled mixed gas bottle; 16 oxygen-controlled system controller; 17 first sealing joint; 18 tubular sample; 19 first loop pipeline; 20 second reactor gas outlet 21 main circuit; 22 second liquid lead-bismuth alloy valve; 23 third liquid lead-bismuth alloy valve; 24 branch line circuit; 25 fourth liquid lead-bismuth alloy valve; 26 second sealing joint; 27 liquid lead-bismuth alloy inlet pipe; 28 liquid lead-bismuth alloy outlet pipe; 29 upper base; 30 lower base; 31 threaded hole; 32 thermocouple; 33 V-type sealing surface; 34 strain extensometer; 35 fatigue test shaft; 36 step; 37 clamping bolt; 38 sealing plug; 39 second circuit pipeline; 40 upper through hole; 41 lower through hole. DETAILED DESCRIPTION

[0037] like Figure 1-2 As shown, the present invention provides a tubular sample dynamic liquid lead-bismuth alloy loop corrosion fatigue test device, which mainly includes: a storage kettle 1, a first liquid lead-bismuth alloy valve 2, a liquid metal electromagnetic pump 3, a first reactor 4, a liquid metal flowmeter 5, a fatigue testing machine 6, a second reactor 7, a storage kettle gas outlet 8, a storage kettle gas inlet 9, a liquid lead-bismuth alloy 10, an oxygen-controlled mixed gas inlet 11, an oxygen-controlled mixed gas outlet 12, a dissolved oxygen electrode 13, an oxygen-controlled electromagnetic valve 14, an oxygen-controlled mixed gas bottle 15, an oxygen-controlled system controller 16, a first sealing joint 17, and a tubular sample 1 8. First loop pipeline 19, second reactor gas outlet 20, main loop 21, second liquid lead-bismuth alloy valve 22, third liquid lead-bismuth alloy valve 23, branch line loop 24, fourth liquid lead-bismuth alloy valve 25, second sealing joint 26, liquid lead-bismuth alloy inlet pipe 27, liquid lead-bismuth alloy outlet pipe 28, upper base 29, lower base 30, threaded hole 31, thermocouple 32, V-shaped sealing surface 33, strain extensometer 34, fatigue test shaft 35, step 36, clamping bolt 37, sealing plug 38, second loop pipeline 39, the specific structure is as follows:

[0038] The storage kettle 1 contains liquid lead-bismuth alloy 10, and the storage kettle 1 is connected to the inner cavity of the first reactor 4 through a first loop pipeline 19. One end of the first loop pipeline 19 is connected to the lower part of the inner cavity of the kettle body of the storage kettle 1, and the other end of the first loop pipeline 19 passes through the kettle cover of the first reactor 4 and extends to the upper part of the inner cavity of the kettle body of the first reactor 4. The first loop pipeline 19 is provided with a first liquid lead-bismuth alloy valve 2 and a liquid metal electromagnetic pump 3. The storage kettle 1 is also connected to the second reactor 7 through a pipeline. One end of the pipeline passes through the kettle cover of the storage kettle 1 and extends to the upper part of the inner cavity of the kettle body of the storage kettle 1, and the other end of the pipeline passes through the bottom of the kettle body of the second reactor 7 and extends to the lower part of the inner cavity of the kettle body of the second reactor 7. The bottom of the first reactor 4 is connected to the second loop pipeline 39 through a pipeline, and a liquid metal flowmeter 5 is provided on the pipeline. The second loop pipeline 39 is connected to the lower end of the through hole of the tubular sample 18 through the third liquid lead-bismuth alloy valve 23 and the liquid lead-bismuth alloy inlet pipe 27 on a branch loop 24. The second loop pipeline 39 is connected to the upper end of the through hole of the tubular sample 18 through the fourth liquid lead-bismuth alloy valve 25 and the liquid lead-bismuth alloy outflow pipe 28 on another branch loop. The second loop pipeline 39 is connected to the second reactor 7 through the main loop 21.

[0039] A storage kettle air inlet 9 and a storage kettle air outlet 8 are provided on the kettle cover of the storage kettle 1. One end of the storage kettle air inlet 9 extends to the outside of the kettle cover of the storage kettle 1, and the other end of the storage kettle air inlet 9 passes through the kettle cover of the storage kettle 1 and extends to the liquid lead-bismuth alloy 10 in the lower part of the inner cavity of the kettle body of the storage kettle 1; one end of the storage kettle air outlet 8 extends to the outside of the kettle cover of the storage kettle 1, and the other end of the storage kettle air outlet 8 passes through the kettle cover of the storage kettle 1 and extends to the upper part of the liquid lead-bismuth alloy 10 in the inner cavity of the storage kettle 1.

[0040] The lid of the first reactor 4 is provided with an oxygen-controlled mixed gas inlet 11, an oxygen-controlled mixed gas outlet 12, and a dissolved oxygen electrode 13, wherein: one end of the oxygen-controlled mixed gas inlet 11 extends to the outside of the first reactor 4, one end of the oxygen-controlled mixed gas inlet 11 is connected to the oxygen-controlled mixed gas bottle 15 through a pipeline and an oxygen-controlled solenoid valve 14 on the pipeline, and the other end of the oxygen-controlled mixed gas inlet 11 passes through the channel on the first reactor 4 and extends to the lower part of the inner cavity of the first reactor 4. One end of the oxygen-controlled mixed gas outlet 12 extends to the outside of the first reactor 4, and the other end of the oxygen-controlled mixed gas outlet 12 passes through the channel on the first reactor 4 and extends to the upper part of the inner cavity of the first reactor 4. The upper end of the dissolved oxygen electrode 13 extends above the lid of the first reactor 4, and the lower end of the dissolved oxygen electrode 13 extends to the middle of the inner cavity of the first reactor 4. The oxygen control system controller 16 is connected to the oxygen control solenoid valve 14 and the dissolved oxygen electrode 13 through lines respectively. The oxygen control system controller 16 controls the air intake of the oxygen control solenoid valve 14 to achieve oxygen control of the liquid lead-bismuth alloy in the inner cavity of the first reactor 4 .

[0041] The second reactor 7 is provided with a second reactor gas outlet 20, one end of which extends to the outside of the reactor cover of the second reactor 7, and the other end of which passes through the reactor cover of the second reactor 7 and extends to the upper part of the inner cavity of the reactor body of the second reactor 7. One end of the main loop 21 of the second loop pipeline 39 passes through the reactor cover of the second reactor 7 and extends to the upper part of the inner cavity of the reactor body of the second reactor 7, and the other end of the main loop 21 of the second loop pipeline 39 is connected to the liquid metal flowmeter 5 through a pipeline.

[0042] The second loop pipeline 39 is a combined pipeline of the main loop 21 and two branch loops 24. The main loop 21 is vertically connected to the two branch loops 24. The main loop 21 is provided with a second liquid lead-bismuth alloy valve 22, and the two branch loops 24 are respectively provided with a third liquid lead-bismuth alloy valve 23 and a fourth liquid lead-bismuth alloy valve 25. One end of the liquid lead-bismuth alloy inlet pipe 27 is connected to the lower end of the through hole of the tubular sample 18, and the other end of the liquid lead-bismuth alloy inlet pipe 27 is connected to one branch loop 24 through the first sealing joint 17; one end of the liquid lead-bismuth alloy outflow pipe 28 is connected to the upper end of the through hole of the tubular sample 18, and the other end of the liquid lead-bismuth alloy outflow pipe 28 is connected to the other branch loop 24 through the second sealing joint 29.

[0043] like Figure 3 As shown, the external shape and size of the gauge section of the tubular specimen 18 are designed according to the standard rod-shaped fatigue specimen. The interior of the tubular specimen 18 is a through hole, and the wall thickness of the gauge section is 2 to 5 mm. Steps 36 with a clamping function are arranged at both ends of the tubular specimen 18 to facilitate loading and unloading. The through hole is a cylindrical hole located in the middle and a conical hole and a threaded hole 31 formed by symmetrically arranged V-shaped sealing surfaces 33 at both ends of the cylindrical hole. The cylindrical hole located in the middle of the through hole is transitionally connected with the threaded hole 31 located on the outside through the V-shaped sealing surface 33.

[0044] like Figure 1 , Figure 4As shown, the upper and lower ends of the tubular specimen 18 are installed in the same manner. The two ends of the tubular specimen 18 are sealed and connected to the sealing plugs 38 through matching clamping bolts 37. The sealing plugs 38 are two symmetrically arranged at the upper and lower ends of the tubular specimen 18. The sealing plugs 38 are cylindrical parts and the structure with cylindrical steps at the head. The outer end surface of the cylindrical step at one end of each sealing plug 38 corresponds to the V-shaped sealing surface 33 of the internal through hole of the tubular specimen 18, and matches with the V-shaped sealing surface 33 through the chamfer. The clamping bolt 38 is a stepped cylindrical structure, and its smaller diameter portion has an external thread. The smaller diameter portion of the clamping bolt 37 corresponds to and matches the threaded hole 31 of the internal through hole of the tubular specimen 18. The center of the clamping bolt 37 has a through hole, so that the clamping bolt 37 is sleeved on the cylindrical portion of the sealing plug 38. The smaller diameter end of the clamping bolt 37 corresponds to and is in close contact with the inner end face of the cylindrical step of the sealing plug 38. After the sealing plug 38 is matched with the clamping bolt 37, the clamping bolt 37 is connected to the threaded hole 31 of the tubular specimen 18 through the external thread.

[0045] The sealing plug 38 has a through hole inside, and the other end of the lower sealing plug is connected to one end of the liquid lead-bismuth alloy inlet pipe 27 through the lower through hole 41 in the lower base 30 through a threaded seal, and the other end of the upper sealing plug is connected to one end of the liquid lead-bismuth alloy outlet pipe 28 through the upper through hole 40 in the upper base 29 through a threaded seal, so as to achieve connection with the second loop pipeline 39 of the dynamic liquid lead-bismuth alloy. The liquid lead-bismuth alloy inlet pipe 27 and the liquid lead-bismuth alloy outlet pipe 28 are wrapped with armored electric heating and wrapped with insulation cotton, and powered for heating. A thermocouple 32 is attached to the outer surface of the gauge section of the tubular sample 18 to monitor / control the temperature of the liquid lead-bismuth alloy flowing through the tubular sample 18 in real time. The tubular specimen 18 is installed on the fatigue test shaft 35 of the fatigue testing machine 6 through the upper base 29 and the lower base 30. After the tubular specimen 18 is installed on the fatigue testing machine 6, a strain extensometer 34 is installed on the outer surface of the gauge section of the tubular specimen 18. The strain extensometer 34 is connected to the fatigue testing machine 6 to monitor / control the strain of the gauge section of the tubular specimen 18 during the fatigue test in real time.

[0046] The matched sealing plug 38 and the clamping bolt 37 are installed at the threaded hole 31 of the tubular sample 18. By tightening the clamping bolt 37, the sealing plug 38 is vertically squeezed so that the head of the sealing plug 38 is in line contact with the V-shaped sealing surface 33 of the tubular sample 18 to form a hard seal. After tightening, the sealing effect is achieved. After the seal is installed, the flow rate (0-4m / s), temperature (300-550℃), oxygen concentration (saturated oxygen-10 -8 wt.%) controlled liquid lead-bismuth alloy corrosion fatigue test.

[0047] The implementation method of preheating and heat preservation of the dynamic liquid lead-bismuth alloy loop is as follows: the first loop pipeline 19 is wound with armored electric heating and wrapped with heat insulation cotton, and the power supply and temperature control are 400°C; the control cabinet supplies power and temperature control to the storage kettle 1, the first reactor 4 and the second reactor 7 through the line, and the liquid lead-bismuth alloy 10 is placed in the storage kettle 1, heated and melted in the storage kettle 1 and the temperature is controlled. The liquid metal electromagnetic pump 3 is powered, a voltage of 150V is applied, the liquid metal electromagnetic pump 3 is idling, and the internal pipeline of the liquid metal electromagnetic pump 3 is heated to 400°C.

[0048] When the temperature of the storage kettle 1, the first loop pipeline 19, the internal pipeline of the liquid metal electromagnetic pump 3, the first reactor 4 and the second reactor 7 is greater than 350°C, the first liquid lead-bismuth alloy valve 2 is opened, and the other liquid lead-bismuth alloy valves are closed. High-purity argon gas (volume purity 99.999%) is passed through the storage kettle air inlet 9, so that the liquid lead-bismuth alloy 10 in the storage kettle 1 can flow into the liquid metal electromagnetic pump 3 along the pipeline, meeting the start-up requirements of the liquid metal electromagnetic pump 3; the storage kettle air inlet 9 is closed, the storage kettle air outlet 8 is opened, the storage kettle 1 is depressurized, and then the storage kettle air outlet 8 is closed, and the second liquid lead-bismuth alloy valve 22 on the second loop pipeline 39 is opened. The voltage of the liquid metal electromagnetic pump 3 is set to 250V, and the liquid lead-bismuth alloy 10 in the pipe starts to flow. The liquid metal flowmeter 5 displays the real-time flow rate, forming a dynamic liquid lead-bismuth alloy loop.

[0049] The upper end of the dissolved oxygen electrode 13 extends to the top of the kettle cover of the first reactor 4, and the lower end of the dissolved oxygen electrode 13 extends to the middle of the inner cavity of the first reactor 4. One end of the oxygen-controlled mixed gas inlet 11 extends to the outside of the first reactor 4, and the other end of the oxygen-controlled mixed gas inlet 11 passes through the channel on the first reactor 4 and extends to the lower part of the inner cavity of the first reactor 4; one end of the oxygen-controlled mixed gas outlet 12 extends to the outside of the first reactor 4, and the other end of the oxygen-controlled mixed gas outlet 12 passes through the channel on the first reactor 4 and extends to the upper part of the inner cavity of the first reactor 4. The oxygen control system controller 16 controls the air intake of the oxygen control solenoid valve 14 to achieve oxygen control of the liquid lead-bismuth alloy in the inner cavity of the first reactor 4.

[0050] The two liquid lead-bismuth alloy valves (the third liquid lead-bismuth alloy valve 23 and the fourth liquid lead-bismuth alloy valve 25) on the branch circuit 24 leading to the fatigue testing machine 6 are opened, and the second liquid lead-bismuth alloy valve 22 is closed, and the liquid lead-bismuth alloy flows through the tubular sample 18, so that the fatigue test of the tubular sample 18 in the dynamic liquid lead-bismuth alloy environment can be carried out. After the fatigue test, the power supply of the liquid metal electromagnetic pump 3 is turned off, and high-purity argon gas (volume purity 99.999%) is introduced into the oxygen-controlled mixed gas inlet 11, and the liquid lead-bismuth alloy in the first reactor 4, the tubular sample 18, and the second loop pipeline 39 enters the second reactor 7, and then blows back to the storage reactor 1 through the pipeline connecting the second reactor 7 and the storage reactor 1, so as to realize the recovery of the liquid lead-bismuth alloy and facilitate the disassembly of the fatigue sample under normal temperature and air conditions.

[0051] The fatigue fixture of the fatigue testing machine 6 is a U-shaped structure (the actuator is placed on the top and the bottom is a steel plate). The fatigue testing machine 6 has load control, displacement control and strain control modes, and can realize functions such as triangular wave, sine wave, trapezoidal wave, and combined waveform.

[0052] Example

[0053] like Figure 1-2 As shown, the installation steps and use method of the tubular sample dynamic liquid lead-bismuth alloy loop corrosion fatigue test device of the present invention are as follows:

[0054] (1) The clamping bolt 37 is sleeved on the sealing plug 38, and the combination structure of the clamping bolt 37 and the sealing plug 38 is installed at the threaded holes 31 at both ends of the tubular sample 18. The clamping bolt 37 is tightened to form a hard seal between the heads of the upper and lower sealing plugs 38 and the V-shaped sealing surface 33 of the tubular sample 18. At the same time, the tubular sample 18 is clamped by the upper base 29 and the lower base 30 using the fatigue testing machine.

[0055] (2) The liquid lead-bismuth alloy inlet pipe 27 is connected to the first sealing joint 17 of the second loop pipe 39 by threads, and the liquid lead-bismuth alloy outlet pipe 28 is connected to the second sealing joint 26 of the second loop pipe 39 by threads, thereby achieving connection with the dynamic liquid lead-bismuth alloy loop.

[0056] (3) The liquid lead-bismuth alloy inlet pipe 27 and the liquid lead-bismuth alloy outlet pipe 28 are wrapped with armored electric heating and wrapped with heat-insulating cotton, and powered for heating. A thermocouple 32 is attached to the surface of the tubular sample 18, and an extensometer 28 is clamped on the tubular sample 18.

[0057] (4) The first loop pipeline 19 is wrapped with armored electric heating and wrapped with insulation cotton, and the power supply and temperature control are set to 400°C. The control cabinet supplies power and temperature control to the storage kettle 1, the first reaction kettle 4 and the second reaction kettle 7 through the lines. The liquid lead-bismuth alloy 10 is placed in the storage kettle 1 and is heated and temperature controlled as the storage kettle 1 is melted. The liquid metal electromagnetic pump 3 is powered and a voltage of 150V is applied to make the liquid metal electromagnetic pump 3 idle, and the internal pipeline of the liquid metal electromagnetic pump 3 is heated to 400°C.

[0058] (5) When the temperature of the storage kettle 1, the first loop pipeline 19, the internal pipeline of the liquid metal electromagnetic pump 3, the first reactor 4 and the second reactor 7 is greater than 350° C., the first liquid lead-bismuth alloy valve 2 and the second liquid lead-bismuth alloy valve 22 are opened, and the other liquid lead-bismuth alloy valves are closed. High-purity argon gas (volume purity 99.999%) is passed through the storage kettle air inlet 9, so that the liquid lead-bismuth alloy in the storage kettle 1 can flow along the pipeline into the liquid metal electromagnetic pump 3, thereby meeting the startup requirements of the liquid metal electromagnetic pump 3.

[0059] (6) The air inlet 9 of the storage kettle is closed, and the air outlet 8 of the storage kettle is opened to relieve the pressure of the storage kettle 1. Then, the air outlet 8 of the storage kettle is closed, and the first liquid lead-bismuth alloy valve 2 is opened. The voltage of the control cabinet of the liquid metal electromagnetic pump 3 is set to 250V. The liquid lead-bismuth alloy in the pipe begins to flow, and the liquid metal flowmeter 5 displays the real-time flow rate, forming a dynamic liquid lead-bismuth alloy loop.

[0060] (7) Open the oxygen control system controller 16 to control the air intake of the oxygen control solenoid valve 14 to achieve oxygen control of the liquid lead-bismuth alloy in the inner cavity of the first reactor 4.

[0061] (8) The two liquid lead-bismuth alloy valves on the branch circuit 24 leading to the fatigue testing machine 6 are opened, and the second liquid lead-bismuth alloy valve 22 is closed. The liquid lead-bismuth alloy flows through the tubular sample 18, so that a fatigue test of the tubular sample 18 in a dynamic liquid lead-bismuth alloy environment can be carried out.

[0062] (9) After the fatigue test, the power supply of the liquid metal electromagnetic pump 3 is turned off, and high-purity argon gas (volume purity 99.999%) is introduced into the oxygen-controlled mixed gas inlet 11, so that the liquid lead-bismuth alloy in the first reactor 4, the tubular sample 18, the first loop pipeline 19, and the second loop pipeline 39 enters the second reactor 7, and is then blown back to the storage reactor 1 through the pipeline connecting the second reactor 7 and the storage reactor 1, so as to realize the recovery of the liquid lead-bismuth alloy and facilitate the disassembly of the fatigue sample under normal temperature and air conditions.

[0063] The implementation results show that the present invention can accurately control the temperature, dissolved oxygen and flow rate parameters of high-temperature liquid lead-bismuth alloy, realize the dynamic high-temperature liquid lead-bismuth alloy environmental strain-controlled fatigue test of tubular specimens, and evaluate the corrosion fatigue performance of structural materials under the action of flowing high-temperature liquid lead-bismuth alloy.

Claims

1. A tubular specimen dynamic liquid lead-bismuth alloy loop corrosion fatigue test device, characterized in that: The storage kettle is filled with liquid lead-bismuth alloy, and the storage kettle is connected to the inner cavity of the first reactor through a first loop pipeline, one end of the first loop pipeline is connected to the lower part of the inner cavity of the kettle body of the storage kettle, and the other end of the first loop pipeline passes through the kettle cover of the first reactor and extends to the upper part of the inner cavity of the kettle body of the first reactor, and the first loop pipeline is provided with a first liquid lead-bismuth alloy valve and a liquid metal electromagnetic pump; the storage kettle is also connected to the second reactor through a pipeline, one end of the pipeline passes through the kettle cover of the storage kettle and extends to the upper part of the inner cavity of the kettle body of the storage kettle, and the other end of the pipeline passes through the kettle cover of the second reactor The bottom of the kettle body of the first reactor extends to the lower part of the inner cavity of the kettle body of the second reactor; the bottom of the first reactor is connected with the second loop pipeline through a pipeline, and a liquid metal flowmeter is arranged on the pipeline; the second loop pipeline is connected with the lower end of the through-hole of the tubular sample through a third liquid lead-bismuth alloy valve and a liquid lead-bismuth alloy inlet pipe on a branch loop; the second loop pipeline is connected with the upper end of the through-hole of the tubular sample through a fourth liquid lead-bismuth alloy valve and a liquid lead-bismuth alloy outflow pipe on another branch loop; the second loop pipeline is connected with the second reactor through the main loop.

2. The tubular specimen dynamic liquid lead-bismuth alloy loop corrosion fatigue test device according to claim 1, characterized in that: The kettle cover of the storage kettle is provided with a storage kettle air inlet and a storage kettle air outlet, one end of the storage kettle air inlet extends to the outside of the kettle cover of the storage kettle, and the other end of the storage kettle air inlet passes through the kettle cover of the storage kettle and extends to the liquid lead-bismuth alloy in the lower part of the inner cavity of the kettle body of the storage kettle; one end of the storage kettle air outlet extends to the outside of the kettle cover of the storage kettle, and the other end of the storage kettle air outlet passes through the kettle cover of the storage kettle and extends to the upper part of the liquid lead-bismuth alloy in the inner cavity of the storage kettle.

3. The tubular specimen dynamic liquid lead-bismuth alloy loop corrosion fatigue testing device according to claim 1, characterized in that: An oxygen-controlled mixed gas inlet, an oxygen-controlled mixed gas outlet, and a dissolved oxygen electrode are arranged on the kettle cover of the first reactor, wherein: one end of the oxygen-controlled mixed gas inlet extends to the outside of the first reactor, one end of the oxygen-controlled mixed gas inlet is connected to the oxygen-controlled mixed gas bottle through a pipeline and an oxygen-controlled solenoid valve on the pipeline, and the other end of the oxygen-controlled mixed gas inlet passes through a channel on the first reactor and extends to the lower part of the inner cavity of the first reactor; one end of the oxygen-controlled mixed gas outlet extends to the outside of the first reactor, and the other end of the oxygen-controlled mixed gas outlet passes through the channel on the first reactor and extends to the upper part of the inner cavity of the first reactor; the upper end of the dissolved oxygen electrode extends to the top of the kettle cover of the first reactor, and the lower end of the dissolved oxygen electrode extends to the middle part of the inner cavity of the kettle body of the first reactor, and the oxygen control system controller is respectively connected to the oxygen-controlled solenoid valve and the dissolved oxygen electrode through lines.

4. The tubular specimen dynamic liquid lead-bismuth alloy loop corrosion fatigue test device according to claim 1, characterized in that: The second reactor is provided with a second reactor gas outlet, one end of the second reactor gas outlet extends to the outside of the reactor cover of the second reactor, and the other end of the second reactor gas outlet passes through the reactor cover of the second reactor and extends to the upper part of the inner cavity of the reactor body of the second reactor; one end of the main loop of the second loop pipeline passes through the reactor cover of the second reactor and extends to the upper part of the inner cavity of the reactor body of the second reactor, and the other end of the main loop of the second loop pipeline is connected with the liquid metal flowmeter through a pipeline.

5. The tubular specimen dynamic liquid lead-bismuth alloy loop corrosion fatigue testing device according to claim 1, characterized in that: The second loop pipeline is a combination pipeline of a main loop and two branch loops. The main loop is vertically connected with the two branch loops. A second liquid lead-bismuth alloy valve is provided on the main loop, and a third liquid lead-bismuth alloy valve and a fourth liquid lead-bismuth alloy valve are provided on the two branch loops respectively. One end of the liquid lead-bismuth alloy inlet pipe is connected with the lower end of the through hole of the tubular sample, and the other end of the liquid lead-bismuth alloy inlet pipe is connected with a branch loop through a first sealing joint. One end of the liquid lead-bismuth alloy outflow pipe is connected with the upper end of the through hole of the tubular sample, and the other end of the liquid lead-bismuth alloy outflow pipe is connected with another branch loop through a second sealing joint.

6. The tubular specimen dynamic liquid lead-bismuth alloy loop corrosion fatigue testing device according to claim 1, characterized in that: The external shape and size of the gauge section of the tubular specimen are designed according to the standard rod-shaped fatigue specimen. The interior of the tubular specimen is a through hole, and the wall thickness of the gauge section is 2 to 5 mm. Steps with a clamping function are arranged at both ends of the tubular specimen. The through hole is a cylindrical hole located in the middle and a conical hole and a threaded hole formed by symmetrically arranged V-shaped sealing surfaces at both ends of the cylindrical hole. The cylindrical hole located in the middle of the through hole is transitionally connected with the threaded hole located on the outside through the V-shaped sealing surface.

7. The tubular specimen dynamic liquid lead-bismuth alloy loop corrosion fatigue testing device according to claim 6, characterized in that: The two ends of the tubular specimen are sealed and connected with the sealing plugs through matching clamping bolts respectively. The sealing plugs are two symmetrically arranged at the upper and lower ends of the tubular specimen. The sealing plug is a structure with a cylindrical part and a cylindrical step on its head. The outer end face of the cylindrical step at one end of each sealing plug corresponds to the V-shaped sealing surface of the internal through hole of the tubular specimen, and is matched with the V-shaped sealing surface through a chamfer; the clamping bolt is a stepped cylindrical structure, and the smaller diameter part of the clamping bolt has an external thread. The smaller diameter part of the clamping bolt corresponds to and matches the threaded hole of the internal through hole of the tubular specimen, and the center of the clamping bolt has a through hole, so that the clamping bolt is sleeved on the cylindrical part of the sealing plug, and the smaller diameter end of the clamping bolt corresponds to and is in close contact with the inner end face of the cylindrical step of the sealing plug. After the sealing plug is matched with the clamping bolt, the clamping bolt is connected with the threaded hole of the tubular specimen through the external thread.

8. The tubular specimen dynamic liquid lead-bismuth alloy loop corrosion fatigue testing device according to claim 7, characterized in that: The sealing plug is provided with a through hole inside, and the other end of the lower sealing plug is connected to one end of the liquid lead-bismuth alloy inlet pipe through the lower through hole in the lower base by a threaded seal, and the other end of the upper sealing plug is connected to one end of the liquid lead-bismuth alloy outflow pipe through the upper through hole in the upper base by a threaded seal, thereby realizing connection with the second circuit pipeline of the dynamic liquid lead-bismuth alloy. The liquid lead-bismuth alloy inlet pipe and the liquid lead-bismuth alloy outflow pipe are wrapped with armored electric heating and wrapped with thermal insulation cotton.

9. The tubular specimen dynamic liquid lead-bismuth alloy loop corrosion fatigue testing device according to claim 7, characterized in that: A thermocouple is attached to the outer surface of the gauge section of the tubular specimen to monitor / control the temperature of the liquid lead-bismuth alloy flowing through the tubular specimen in real time; the tubular specimen is installed on the fatigue fixture of the fatigue testing machine through the upper base and the lower base. After the tubular specimen is installed on the fatigue testing machine, a strain extensometer is installed on the outer surface of the gauge section of the tubular specimen. The strain extensometer is connected to the fatigue testing machine to monitor / control the strain of the gauge section of the tubular specimen during the fatigue test in real time; Install the matched sealing plug and the clamping bolt on the threaded hole of the tubular sample. By tightening the clamping bolt, vertically squeeze the sealing plug so that the head of the sealing plug contacts the V-shaped sealing surface of the tubular sample to form a hard seal. After tightening, the sealing effect is achieved. After the seal is installed, the flow rate can reach 0-4m / s, the temperature can reach 300-550℃, and the oxygen concentration can reach saturated oxygen to 10 - 8 wt.% controlled liquid lead-bismuth alloy corrosion fatigue test.

10. A method for using the tubular specimen dynamic liquid lead-bismuth alloy loop corrosion fatigue test device according to any one of claims 1 to 9, characterized in that: The steps include: (1) The clamping bolt is sleeved on the sealing plug, and the combination structure of the clamping bolt and the sealing plug is installed at the threaded holes at both ends of the tubular specimen. The clamping bolt is tightened to form a hard seal between the heads of the upper and lower sealing plugs and the V-shaped sealing surface of the tubular specimen. At the same time, the fatigue fixture of the fatigue testing machine is used to clamp the tubular specimen through the upper base and the lower base; (2) The liquid lead-bismuth alloy inlet pipe is connected to the first sealing joint of the second loop pipeline by threads, and the liquid lead-bismuth alloy outlet pipe is connected to the second sealing joint of the second loop pipeline by threads, so as to achieve connection with the dynamic liquid lead-bismuth alloy loop; (3) The liquid lead-bismuth alloy inlet pipe and the liquid lead-bismuth alloy outlet pipe are wrapped with armored electric heating and wrapped with thermal insulation cotton, and powered for heating; a thermocouple is attached to the surface of the tubular sample, and an extensometer is clamped on the tubular sample; (4) The first loop pipeline is wrapped with armored electric heating and wrapped with insulation cotton, and the power supply and temperature control are set to 400°C. The control cabinet supplies power and temperature control to the storage kettle, the first reactor and the second reactor through the line. The liquid lead-bismuth alloy is placed in the storage kettle and heated and temperature controlled as the storage kettle melts. The liquid metal electromagnetic pump is powered and a voltage of 150V±30V is applied to make the liquid metal electromagnetic pump run idle, and the internal pipeline of the liquid metal electromagnetic pump is heated to 400°C. (5) When the temperature of the storage kettle, the loop pipeline, the internal pipeline of the liquid metal electromagnetic pump, the first reactor and the second reactor is greater than 350° C., the first liquid lead-bismuth alloy valve is opened, the other liquid lead-bismuth alloy valves are closed, and high-purity argon gas is passed through the gas inlet of the storage kettle to make the liquid lead-bismuth alloy in the storage kettle flow along the pipeline into the liquid metal electromagnetic pump, thereby meeting the start-up requirements of the liquid metal electromagnetic pump; (6) closing the air inlet of the storage kettle, opening the air outlet of the storage kettle, depressurizing the storage kettle, and then closing the air outlet of the storage kettle, opening the first liquid lead-bismuth alloy valve, setting the voltage of the liquid metal electromagnetic pump control cabinet to 250V, and the liquid lead-bismuth alloy in the pipe begins to flow, and the liquid metal flow meter displays the real-time flow rate, forming a dynamic liquid lead-bismuth alloy loop; (7) turning on the oxygen control system controller to control the air intake of the oxygen control solenoid valve to achieve oxygen control of the liquid lead-bismuth alloy in the inner cavity of the first reactor; (8) opening two liquid lead-bismuth alloy valves on the branch circuit leading to the fatigue testing machine, closing the first liquid lead-bismuth alloy valve, and allowing the liquid lead-bismuth alloy to flow through the tubular specimen, so that a fatigue test of the tubular specimen in a dynamic liquid lead-bismuth alloy environment can be carried out; (9) After the fatigue test is completed, the power supply of the liquid metal electromagnetic pump is turned off, and high-purity argon gas is introduced into the oxygen-controlled mixed gas inlet, so that the liquid lead-bismuth alloy in the first reactor, the tubular sample, the first loop pipeline, and the second loop pipeline enters the second reactor, and then is blown back to the storage reactor through the pipeline connecting the second reactor and the storage reactor, so as to realize the recovery of the liquid lead-bismuth alloy and disassemble the fatigue sample under normal temperature and air conditions.

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