CN-117571492-B - Oxygen-control liquid lead bismuth stress corrosion experimental device and experimental method

Abstract

The invention relates to an oxygen-control liquid lead bismuth stress corrosion experimental device which comprises an experimental tank, a vacuum system, a temperature control system, a cooling system, an oxygen control system, a stress loading system, an electric lifting system of an upper cover of the experimental tank and an electric lifting system of the stress loading system, wherein the vacuum system, the temperature control system, the cooling system and the oxygen control system are respectively arranged on the experimental tank, the electric lifting system of the upper cover of the experimental tank is connected with the upper cover of the experimental tank, the electric lifting system of the upper cover of the experimental tank can drive the upper cover of the experimental tank to ascend or descend, the electric lifting system of the stress loading system is connected with the stress loading system, and the electric lifting system of the stress loading system can drive experimental samples on the stress loading system to stretch into or stretch out of a tank body of the experimental tank. The invention can carry out research experiments of combining liquid lead bismuth corrosion and stress under different oxygen concentration conditions.

Inventors

• ZHANG HONGPENG
• YAO CUNFENG
• WANG ZHIGUANG
• PENG TIANJI

Assignees

• 中国科学院近代物理研究所

Dates

Publication Date

20260512

Application Date

20231115

Claims (6)

1. 1. The experimental device is characterized by comprising an experimental tank, a vacuum system, a temperature control system, a cooling system, an oxygen control system, a stress loading system, an experimental tank upper cover electric lifting system and a stress loading system electric lifting system, wherein the vacuum system, the temperature control system, the cooling system and the oxygen control system are respectively arranged on the experimental tank, the experimental tank upper cover electric lifting system is connected with the experimental tank upper cover, the experimental tank upper cover electric lifting system can drive the experimental tank upper cover to ascend or descend, the stress loading system electric lifting system is connected with the stress loading system, and the stress loading system electric lifting system can drive an experimental sample on the stress loading system to stretch into or stretch out of a tank body of the experimental tank; the temperature control system comprises a temperature control thermocouple, a heating power supply, a silicon controlled rectifier, an intelligent temperature controller, an armored heating wire, a heat preservation shell and a liftable temperature thermocouple, wherein the armored heating wire and the heat preservation shell are sequentially coated outside the experimental tank body, the temperature control thermocouple passes through the heat preservation shell to be in close contact with the outer wall of the experimental tank body, the liftable temperature thermocouple is connected with the inside of the experimental tank through a liftable temperature thermocouple interface arranged on the upper cover of the experimental tank, the liftable temperature thermocouple is connected with the upper cover of the experimental tank through a dynamic seal, the temperature control thermocouple and the liftable temperature thermocouple are respectively connected with the intelligent temperature controller, the heating power supply is connected with the intelligent temperature controller through the silicon controlled rectifier, and the heating power supply is connected with the armored heating wire; The oxygen control system comprises an air source, an air path pipeline, an oxygen concentration control device, a liftable oxygen probe, an air inlet pipeline, an air inlet valve and a check valve, wherein the air source is connected with the oxygen concentration control device through the air path pipeline, the oxygen concentration control device is connected with the experimental tank through the air inlet pipeline, the interface of the air inlet pipeline and the experimental tank is arranged at the upper part of the tank body of the experimental tank, the air inlet pipeline is provided with the air inlet valve, the air outlet of the air inlet pipeline is arranged at the bottom of the experimental tank, the air outlet pipeline is provided with the check valve, the experimental tank is provided with a liftable oxygen probe interface, the liftable oxygen probe is arranged on the upper cover of the experimental tank through the liftable oxygen probe interface, the liftable oxygen probe is connected with the upper cover of the experimental tank through dynamic sealing, and the signal output end of the liftable oxygen probe is connected with the oxygen concentration control device; the oxygen concentration control equipment comprises a gas regulating valve, a gas flowmeter and an oxygen concentration analyzer, wherein the gas flowmeter and the gas regulating valve are respectively arranged on the gas path pipeline, and the oxygen concentration analyzer is connected with the signal output end of the liftable oxygen probe; The stress loading system comprises a fixing frame, an experiment sample frame, a tension rod, a pulley counterweight device, a first dynamic seal and a second dynamic seal, one end of the fixing frame is connected with an electric lifting system of the stress loading system, the other end of the fixing frame extends to the inside of the experiment tank, a semi-sealing chamber is formed between the fixing frame and an upper cover of the experiment tank, one end of the tension rod is connected with the pulley counterweight device, the other end of the tension rod extends to the semi-sealing chamber, the other end of the tension rod is provided with the experiment sample frame so as to enable the experiment sample frame to be suspended in the semi-sealing chamber, the upper end of the experiment sample is movably connected with the experiment sample frame, the lower end of the experiment sample is movably connected with the fixing frame, a connecting part between the semi-sealing chamber and the tension rod is provided with the first dynamic seal, and a second dynamic seal is arranged between the semi-sealing chamber and the upper cover of the experiment tank.
2. 2. The oxygen-controlled liquid lead bismuth stress corrosion experimental device according to claim 1, wherein the vacuum system comprises a vacuum mechanical pump, a vacuum electromagnetic valve, an air exhaust pipeline, a vacuum measuring element, a vacuum stop valve, a vacuum air release valve and a vacuum display instrument, an air exhaust pipeline is arranged on a tank body of the experimental tank, one end of the air exhaust pipeline is connected with the air exhaust pipeline, the other end of the air exhaust pipeline is connected with the vacuum mechanical pump through the vacuum electromagnetic valve, and the vacuum stop valve, the vacuum measuring element and the vacuum air release valve are sequentially arranged on the air exhaust pipeline.
3. 3. The oxygen-controlled liquid lead bismuth stress corrosion experimental device according to claim 2, wherein the cooling system comprises a water chiller, a cooling water pipe and a water valve, the upper cover of the experimental tank is provided with a cooling water pipe interface, the water chiller is connected with the upper cover of the experimental tank through the cooling water pipe, and the water valve is arranged on the cooling water pipe.
4. 4. The oxygen-controlled liquid lead bismuth stress corrosion experimental device according to claim 3, wherein the experimental tank upper cover electric lifting system comprises an experimental tank upper cover lifting motor, an experimental tank upper cover transmission screw, an experimental tank upper cover guide rod, an experimental tank upper cover limiting device and an experimental tank upper cover lifting controller, wherein the experimental tank upper cover lifting controller is connected with the experimental tank upper cover lifting motor, the experimental tank upper cover lifting motor is connected with the experimental tank upper cover transmission screw, a sliding block on the experimental tank upper cover transmission screw is connected with the experimental tank upper cover, and the experimental tank upper cover is sleeved on the experimental tank upper cover guide rod, when the experimental tank upper cover lifting motor drives the experimental tank upper cover to ascend or descend through the experimental tank upper cover transmission screw, the experimental tank upper cover is moved along the experimental tank upper cover guide rod direction, and the experimental tank upper cover limiting device is arranged on the experimental tank upper cover guide rod; And/or the electric lifting system of the stress loading system comprises a lifting motor of the stress loading system, a transmission screw of the stress loading system, a guide rod of the stress loading system, a limiting device of the stress loading system and a lifting controller of the stress loading system, wherein the lifting controller of the stress loading system is connected with the lifting motor of the stress loading system, the lifting motor of the stress loading system is connected with the transmission screw of the stress loading system, a sliding block on the transmission screw of the stress loading system is connected with the fixing frame, the fixing frame is sleeved on the guide rod of the stress loading system, and when the lifting motor of the stress loading system drives the fixing frame to ascend or descend through the transmission screw of the stress loading system, the fixing frame moves along the direction of the guide rod of the stress loading system, and the limiting device of the stress loading system is arranged on the guide rod of the stress loading system.
5. 5. An oxygen-controlled liquid lead bismuth stress corrosion experiment method, which is characterized by comprising the following specific experiment steps of using the oxygen-controlled liquid lead bismuth stress corrosion experiment device as claimed in any one of claims 1 to 4: Starting an electric lifting system of an upper cover of the experimental tank to lift the upper cover of the experimental tank, putting a lead-bismuth alloy cast ingot into the experimental tank, then lowering the upper cover of the experimental tank to seal the experimental tank, starting a vacuum mechanical pump to exhaust air, and starting a temperature control system to realize heating until the lead-bismuth cast ingot is completely melted into a liquid state; removing scum on the surface of liquid lead bismuth, loading an experimental sample on an experimental sample frame when the liquid level of the lead bismuth alloy reaches a preset height, and adding a counterweight weight to enable the experimental sample to keep a vertical stress state; Under the vacuum condition of the experimental tank, the temperature of the liquid lead-bismuth alloy and the oxygen content of the experimental tank are respectively adjusted by a temperature control system and an oxygen control system, so that the temperature and the oxygen content of the liquid lead-bismuth alloy meet the experimental requirements; Adjusting the counterweight weight to enable the stress on the experimental sample to reach a preset target, and starting an electric lifting system of a stress loading system to lower the experimental sample frame so that the liquid lead bismuth is completely immersed in the experimental sample; and monitoring the stress corrosion state of the experimental sample, and ending the stress corrosion experiment after the experimental sample is broken or the preset corrosion time is reached.
6. 6. The oxygen-controlled liquid lead bismuth stress corrosion test method according to claim 5, wherein when the liquid level of the lead bismuth alloy does not reach the preset height, the temperature control system is closed, after the temperature of the lead bismuth alloy in the test tank is reduced to room temperature, the step of starting the electric lifting system of the upper cover of the test tank to lift the upper cover of the test tank, putting the lead bismuth alloy ingot into the test tank, then lowering the upper cover of the test tank to seal the test tank, starting the vacuum mechanical pump to suck air, starting the temperature control system to realize heating until the lead bismuth ingot is completely melted into the liquid state, and the step of removing scum on the surface of the liquid lead bismuth is repeated until the liquid level of the lead bismuth alloy reaches the preset height.

Description

Oxygen-control liquid lead bismuth stress corrosion experimental device and experimental method Technical Field The invention relates to the technical field of stress corrosion experiments, in particular to an oxygen-control liquid lead bismuth stress corrosion experiment device and an experiment method. Background The liquid lead bismuth alloy has excellent neutron and physical and chemical properties, and is the preferred material of the lead cold fast reactor coolant. However, the structural material may be subjected to stress corrosion under the combined action of liquid lead bismuth and stress, so that the structural material is subjected to brittle fracture under low stress, and the phenomenon has unpredictability and huge harm, and is an important hidden trouble for affecting the safe operation of the lead-cooled fast reactor. Therefore, a stress corrosion experiment of the structural material in a liquid lead bismuth environment is carried out, and the stress corrosion performance of the structural material is evaluated to provide reliable data support for engineering application, so that the method has important significance for the research and development of the lead cold fast reactor. At present, two main modes of stress corrosion experiments under the liquid lead bismuth environment are developed, namely, the stress corrosion under the liquid lead bismuth corrosion environment is realized by adding the liquid lead bismuth corrosion environment on a tensile testing machine, and the C-type ring experiment is developed under the liquid lead bismuth corrosion environment. The two methods have the advantages and disadvantages that the stress corrosion experiment of a plurality of experimental samples can be carried out by the C-shaped ring experiment, but in the high-temperature corrosion environment, the material is easy to creep at high temperature, the stress value in the material experiment is difficult to determine, and the tensile testing machine added with the liquid lead bismuth corrosion environment can determine the stress value in the material experiment, but only one experimental sample can be used for carrying out the stress corrosion experiment. In addition, the dissolved oxygen in the liquid lead bismuth can influence the wettability of the liquid lead bismuth to the material and influence the stress corrosion performance of the material. In summary, the existing experimental method for evaluating the liquid lead bismuth stress corrosion performance of the structural material is not high in accuracy or low in efficiency, and is difficult to meet the requirements of engineering on the evaluation of the liquid lead bismuth stress corrosion performance of the material. In summary, it is necessary to develop a novel oxygen-controlled liquid lead bismuth stress corrosion experimental device, develop a stress corrosion experimental method, and improve the efficiency and accuracy of material stress corrosion performance evaluation. Therefore, an oxygen-controlled liquid lead bismuth stress corrosion experimental device is urgently needed. Disclosure of Invention The invention provides an oxygen-control liquid lead bismuth stress corrosion experimental device, and aims to solve the problem of low evaluation efficiency of liquid lead bismuth stress corrosion performance in the prior art. The invention further provides an oxygen-control liquid lead bismuth stress corrosion experimental method. In order to achieve the above purpose, the present invention adopts the following technical scheme: The invention provides an oxygen-control liquid lead bismuth stress corrosion experimental device, which comprises an experimental tank, a vacuum system, a temperature control system, a cooling system, an oxygen control system, a stress loading system, an electric lifting system of an upper cover of the experimental tank and an electric lifting system of the stress loading system, wherein the vacuum system, the temperature control system, the cooling system and the oxygen control system are respectively arranged on the experimental tank, the electric lifting system of the upper cover of the experimental tank is connected with the upper cover of the experimental tank, the electric lifting system of the upper cover of the experimental tank can drive the upper cover of the experimental tank to lift or descend, the electric lifting system of the stress loading system is connected with the stress loading system, and the electric lifting system of the stress loading system can drive an experimental sample on the stress loading system to stretch into or stretch out of a tank body of the experimental tank. The experimental device for the stress corrosion of the oxygen-controlled liquid lead and bismuth comprises a vacuum mechanical pump, a vacuum electromagnetic valve, an air exhaust pipeline, a vacuum measuring element, a vacuum stop valve, a vacuum air release valve and a vacuum display instrument, wherein an air