Abstract
The effect of decarburisation of the surface layer on magnetic Barkhausen noise (MBN) emission was investigated in quenched and tempered steel containing 0.67% carbon. The MBN profile of intensity versus energising current from the un-decarburised material showed a single peak typifying the martensite structure. After decarburisation, a profile with a double peak was obtained. The presence of the decarburised layer produced a second, overlapping peak at a lower field value. The height of the second peak increased with increasing depth of decarburisation and its position moved to increasingly lower field values.
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Blaow, M., Evans, J.T. & Shaw, B.A. Surface decarburisation of steel detected by magnetic barkhausen emission. J Mater Sci 40, 5517–5520 (2005). https://doi.org/10.1007/s10853-005-4240-5
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DOI: https://doi.org/10.1007/s10853-005-4240-5