System and method for testing high-frequency fatigue life in high-temperature steam environment

Abstract

The invention belongs to the technical field of material performance tests and discloses a system for testing high-frequency fatigue life in a high-temperature steam environment. The system comprises a test rack, wherein a steam box and a fatigue testing machine are fixedly arranged on the test rack; high-frequency cyclic loading of a fatigue sample is realized through the fatigue testing machine; the sample penetrates through the steam box; two ends of the sample are respectively and rotatably connected with the steam box in a sealed mode; a middle part of the sample is exposed in an internal environment of the steam box; the steam box comprises a steam input end and a steam output end; the steam input end of the steam box is connected with a steam generator; the steam generator is supplied with water by a water tank; an oxygen removal device is arranged on the water tank; the steam output end of the steam box is connected with a condenser; an oxygen content measuring device is connected to the condenser. The invention also discloses a related test method. The adopted steam generator can generate water vapor with stable flow. By arranging a dissolved oxygen testing device and monitoring steam temperature in real time, an operating environment of an actual member can be simulated to the greatest degree.

Description

technical field [0001] The invention belongs to the technical field of material performance testing, in particular to a high-frequency fatigue life testing system and testing method in a high-temperature steam environment. Background technique [0002] As the core component of electric power equipment, steam turbine's design and manufacturing level reflect the strength of technological innovation. The blades of steam turbines are energy and power components, and their safety and reliability are directly related to the long-term stable operation of power plant units. For example, in the final blade area, the diameter and rotational speed are large, the centrifugal force and alternating stress act together, the working load is complex, and it works in a wet steam environment. The complex working conditions and harsh service environment of steam turbine blades can easily cause fatigue damage. The design of the blade and its structure, the selection of blade materials and othe...

AI Technical Summary

Problems solved by technology

The conventional corrosion fatigue testing machine is not equipped with a high-temperature steam generating device and its circulation system. There are existing Chinese patents "An Environmental Device for Fatigue Crack Growth Rate Test in a Corrosion Environment" (Application No.: 200810167021.7) Fatigue test system" (application number: 201310360438.6), "a salt spray environment device for fatigue performance test" and "corrosion fatigue test device with high temperature and high pressure circulating water" (application number: 200920270850.8), etc. are provided A solution environment device for carrying out fatigue tests, but it cannot meet the requirements of high temperature steam environment

In addition, in the service environment of the blade, the oxygen content in the wet steam is generally lower than 1 ppm, which poses a new challenge to the development of the steam fatigue test system

Images