System for testing fatigue performance of material in high-temperature molten salt environment

Abstract

The invention discloses a material fatigue performance test system in a high-temperature molten salt environment, which is used for exploring the material fatigue performance in the high-temperature molten salt environment and mainly comprises a melting device, a test device, a thermocouple, a control valve and a data acquisition and control center, the melting device is used for converting molten salt from a solid state into a liquid state in a test so as to realize circulation of the molten salt, the test device is used for simulating a molten salt fluid flowing environment, and the thermocouple is used for monitoring the liquid level of the molten salt. The data and acquisition system is used for data monitoring and control of the whole test system, and the control valve is used for controlling the flow of fused salt. According to the invention, long-time mechanical property tests, such as a slow strain rate tensile test, a creep test, a fatigue test and a creep fatigue interaction test, can be carried out on a material in a molten salt flowing environment; therefore, the stress corrosion cracking behavior, the corrosion-creep behavior, the corrosion-fatigue behavior and the corrosion-creep-fatigue interaction behavior of the material in the high-temperature molten salt flowing environment are further studied.

Description

technical field [0001] The invention relates to the technical field of material testing, in particular to a material fatigue performance testing system in a high temperature molten salt environment. Background technique [0002] Molten salt has many advantages such as wide liquid temperature range, low viscosity, good flow performance, low vapor pressure, low requirement for pipeline pressure bearing capacity, high relative density, high specific heat capacity, strong heat storage capacity, and low cost. It is a recognized good medium and high temperature heat transfer and heat storage medium. Molten salt is corrosive at high temperature. Equipment such as containers and pipelines in contact with high-temperature molten salt will be corroded by molten salt during long-term service. Larger stress, in addition, frequent starting and stopping of equipment and heat exchange will also bring great thermal stress to the equipment, so the above structural materials may be damaged b...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a material fatigue performance testing system in a high-temperature molten salt environment, which solves the problem of difficult testing of various mechanical properties of materials in a high-temperature molten salt flow environment, and effectively solves the problem that the molten salt evaporates at a high temperature. For the problem that long-term tests cannot be carried out, long-term mechanical performance tests can be carried out on materials in a molten salt flow environment, such as slow strain rate tensile tests, creep tests, fatigue tests, and creep-fatigue interaction tests, so as to further study Stress corrosion cracking behavior, corrosion-creep behavior, corrosion-fatigue behavior and corrosion-creep-fatigue interaction behavior of materials in high temperature molten salt flow environment

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