DocumentCode :
3835860
Title :
Determination of Hardness and Residual-Stress Variations in Hardened Surface Layers With Magnetic Barkhausen Noise
Author :
P. Zerovnik;J. Grum;G. Zerovnik
Author_Institution :
$^{1}$ Faculty of Mechanical Engineering, , University of Ljubljana, , Ljubljana , Slovenia
Volume :
46
Issue :
3
fYear :
2010
fDate :
3/1/2010 12:00:00 AM
Firstpage :
899
Lastpage :
904
Abstract :
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.
Keywords :
"Magnetic noise","Residual stresses","Frequency","Magnetic analysis","Magnetic sensors","Permeability","Magnetic flux","Microstructure","Conductivity","Magnetic separation"
Journal_Title :
IEEE Transactions on Magnetics
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.2009.2032417
Filename :
5276859
Link To Document :
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