An Investigation of Elastic Stress (Strain) - Induced Subtle Magnetic Changes in Steels

Abstract:

By means of a simple energy discrimination technique it was possible to show the stress induced formation of two distinct ranges of Barkhausen micromagnetic activity. The formation of these ranges was attributed to the existence of two different modes of domain wall motion each of which was related to the grain boundaries as well as the grain interior activity. By adopting an exponential energetic count distribution approach a semi-quantitative estimation of the tensile stress-induced magnetic changes was given. In this context it was shown that the experimentally obtained low limit elastic stress, at which magnetic changes set on, are in reasonably agreement with existing theoretical values. It was also show that the externally supplied elastic stress (strain) energy leads to a shift of the energy distribution spectrum of the emitted Barkhausen counts to higher energies.

• Periodical: Key Engineering Materials (Volume 605)
• Pages: 637-640
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.605.637
• Online since: April 2014
• Authors: V.N. Kytopoulos*, E.K. Ioakeimidis
• Keywords: Corrosion, Magnetic Barkhausen Noise (MBN)

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