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Effect of hardness and composition gradients on Barkhausen emission in case hardened steel

Lookup NU author(s): Mohamed Blaow, Emeritus Professor Terry Evans, Professor Brian Shaw


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The effect of gradients in hardness, structure and composition in the surface layers on magnetic Barkhausen noise (MBN) was investigated in two widely used low alloy steels. One material was case hardened by induction hardening. The other was case carburised. Similar hardness profiles were produced by the two treatments. It was found that the variation in structure and hardness through the case in the induction-hardened steel had a minor effect on the MBN profile. In contrast, the inhomogeneity in the case-carburised material showed up clearly. This took the form of a broadened or two-peak MBN profile. When the surface layer containing the case was removed by etching, the broadened profile was replaced by a profile with a single peak. It is concluded that the shape and position of the MBN profile is significantly affected when a gradient in microstructure is induced by a gradient in carbon content. On the other hand, a gradient in microstructure induced by heat treatment with a constant carbon level has much less affect on the MBN profile for the induction-hardened steel. © 2005 Elsevier B.V. All rights reserved.

Publication metadata

Author(s): Blaow M, Evans JT, Shaw BA

Publication type: Article

Publication status: Published

Journal: Journal of Magnetism and Magnetic Materials

Year: 2006

Volume: 303

Issue: 1

Pages: 153-159

ISSN (print): 0304-8853

ISSN (electronic): 1873-4766

Publisher: Elsevier BV


DOI: 10.1016/j.jmmm.2005.07.034


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