Surface decarburisation of steel detected by magnetic barkhausen emission

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 martensi...

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Bibliographic Details
Published in:Journal of materials science 2005-10, Vol.40 (20), p.5517-5520
Main Authors: BLAOW, M, EVANS, J. T, SHAW, B. A
Format: Article
Language:English
Subjects:
Applied sciences
Barkhausen effect
Carbon
Emission
Emission analysis
Exact sciences and technology
Martensite
Materials science
Metals. Metallurgy
Other surface treatments
Production techniques
Quenching and tempering
Structural steels
Surface layer
Surface layers
Surface treatment
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Summary: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.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-005-4240-5