Lookup NU author(s): Dr Moorthy Vaidhianathasamy,
Professor Brian Shaw
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The effect of applied and residual stresses on the magnetic Barkhausen emission (MBE) profile has been studied in case-carburised En36 steel specimens with 0.65 and 0.95 mm case-depth. The initial MBE profile shows two peaks in lower case-depth specimen and only single peak in higher case-depth specimen. The MBE peaks gradually increase in height with applied tensile stress. Under compression, the first peak in lower case-depth specimen disappears and the dominant second peak decreases in both case-depth specimens. However, after unloading from higher stress levels, the MBE profiles show different behaviour. In lower case-depth specimen, on tensile side, the first peak disappears and the second peak decreases with pre-stress level. On compressive side, the first peak increases while the second peak decreases with pre-stress level. In higher case-depth specimen, on both tensile and compressive sides, the MBE peak decreases with pre-stress, but to different extent. These variations in MBE peaks are correlated with residual stress redistribution in the near-surface and subsurface regions. © 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Author(s): Moorthy V, Shaw BA, Day S
Publication type: Article
Publication status: Published
Journal: Acta Materialia
ISSN (print): 1359-6454
ISSN (electronic): 1873-2453
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