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Estimate of early stages of destruction during stress corrosion cracking of pipe steels by eddy current method
Summary
This study used eddy current measurements to evaluate early-stage damage development during stress corrosion cracking of low-carbon steel pipes. The method detected fine microstructural changes associated with crack initiation before visible cracking, offering potential for early non-destructive damage assessment.
The paper studies stress corrosion cracking (SCC) of low carbon low alloyed steels. It is shown that the use of eddy current method allows us to evaluate modifications of fine structures associated with the processes of initiation and growth of stress corrosion cracks. The dependences of the incubation time on the value of the macroelasticity limit σ 0 are given. It is noted that the increase in the value of σ 0 leads to an increase in the time before the initiation of the first crack. This can be explained: the limit of macroelasticity determines the beginning of microplastic flow in the material. On the basis of experimental data, the analytical dependence of the incubation period of the SCC on the value of the macroelasticity limit is obtained. The calculation error did not exceed 10%. A parameter is proposed for assessing the state of the material subject to SCC. It allows recording the passage of the stages of accumulation of micro-damages and the moment of exhaustion of a significant part of the material resource before the appearance of multiple surface macro-cracks according to the data of eddy current measurements.