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HomeMaterials Science ForumMaterials Science Forum Vol. 856Magnetic Barkhausen Measurements for Determining...

Magnetic Barkhausen Measurements for Determining Residual Stress Distribution in Welded Electrical Steels

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Abstract:

In the present research work the determination of residual stress distribution in welded non-oriented electrical steel samples is discussed. Tungsten Inert Gas and Electron Beam Welding were used as the welding methods. The residual stresses induced by welding estimated by the magnetic, non-destructive method of Barkhausen noise and were compared with the values resulting from the semi-destructive method of X-ray diffraction Bragg-Brentano (XRD-BB). In order to evaluate accuracy and reliability of the magnetic methods applied, the steel samples were subjected in both compressive and tensile stress and the magnetic noise values were correlated to residual stress values through an appropriate calibration curve. Furthermore, the fluctuations of the residual stresses in the welding zones of the welded samples were discussed on the basis of the experimental evidence and the microstructural changes occurring during welding. It was found that the residual stress determined by MBN method was in good agreement with the XRD-BB results. However, the residual stress determined by magnetic permeability method was not in good agreement with the XRD-BB results. In contrast to the XRD-BB method, the magnetic techniques required a precise calibration procedure in all zones with noticeably different microstructure.

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Periodical:

Materials Science Forum (Volume 856)

Pages:

147-152

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.856.147

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Online since:

May 2016

Authors:

Polykseni Vourna, Aphrodite Ktena, Athanasios G. Mamalis, Evangelos Hristoforou*, Peng Wan Chen, Qiang Zhou

Keywords:

Magnetic Barkhausen Noise, Non-Oriented Electrical Steel, Residual Stress, Welding, X-Ray Diffraction

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© 2016 Trans Tech Publications Ltd. All Rights Reserved

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