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- Metal magnetic memory (1) (entfernen)
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The measurement of spontaneous magnetic stray fields of ferromagnetic materials is considered as a new method of non-destructive testing, the Metal Magnetic Memory method. Usually fluxgate sensors with spatial resolution in the order of a few millimeters are used as receivers. This contribution discusses the application of GMR (Giant Magneto Resistance) sensors with a spatial resolution in the micrometer range. Studies reveal that GMR sensors can detect clear demarcated plastic deformations in S235JR steel. Furthermore we present high spatial resolution magnetic measurements of deformation induced martensite formation of AISI 304 metastable austenitic steel for different deformation states.