Stress corrosion behavior of high manganese steel in simulated marine environment

Taking low temperature high manganese steel as the research object, the microstructure of high manganese steel was observed using optical microscope, scanning electron microscope, transmission electron microscope, and X-ray energy spectrometer. The stress corrosion behavior of high manganese steel in artificial seawater solution was studied by constant load stress corrosion test, and its corrosion performance was tested using electrochemical methods. The results show that the grain size of low temperature high manganese steel varies, and the microstructure was mainly deformed austenite. There were dislocations and twinning in the sample, and no obvious precipitates were found at the grain boundaries. During the use of low temperature high manganese steel, the defect areas preferentially underwent corrosion. Under constant stress conditions, microcracks were locally generated on the surface of the material, and the propagation rate was slow, making the material insensitive to stress corrosion. When stress changed, the balance between microcracks and stress in the specimen was disrupted, accelerating crack propagation and the initiation of new microcracks. Materials were prone to stress corrosion cracking in corrosive environments.