Abstract

The remanence fields of fatigued ferritic steel specimens were measured using a scanning microscope based on a high transition temperature superconducting quantum interference device (SQUID). The results show an overall increase of remanence until dislocation density saturates and an additional local remanence increase after saturation during cyclic loading. Because of the combined magnetic and spatial resolution of the SQUID microscope, these local changes of dislocation structures can be detected before a crack actually initiates, and identify the sites where crack nucleation will occur.

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