Abstract
Magnetoacoustic emission (MAE) and Barkhausen emission (BE) measurements have been made on hypereutectoid steel samples heat treated to produce completely pearlitic microstructures with various interlamellar spacings. Both the peak height ratio of the MAE profile and the amplitude of the BE profile were found to increase with increasing interlamellar spacing. These results can be explained in the context of the domain structure and the domain wall processes observed by Lorentz microscopy. The correlation of the spacing with the shape of the MAE and BE profiles shows that both techniques are useful for monitoring the pearlite interlamellar spacing.
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