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Determination of Hardness and Residual-Stress Variations in Hardened Surface Layers With Magnetic Barkhausen Noise

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3 Author(s)
Zerovnik, P. ; Fac. of Mech. Eng., Univ. of Ljubljana, Ljubljana, Slovenia ; Grum, J. ; Zerovnik, G.

We use magnetic Barkhausen noise to assess the microstructure, hardness, and residual stresses in hardened surface layers. We performed measurements on induction surface-hardened specimens, the thickness of hardened layers being different in each case. A change in the microstructure of the hardened surface layer produces changes in specific electric conductivity ?? and relative permeability ??r . The two parameters and chosen analyzing frequencies influence the depth sensing of micromagnetic changes. The most commonly chosen characteristic of Barkhausen noise is the V2 RMS value of a captured signal. The choice of frequency determines the depth at which the Barkhausen noise will be analyzed to determine microhardness or residual stresses.

Published in:

Magnetics, IEEE Transactions on  (Volume:46 ,  Issue: 3 )

Date of Publication:

March 2010

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