Physics 901 Colloquium (Internal to Department)

A Correlation Study between the Magnetic Barkhausen Noise Signals and Intergranular Strains in Mild Steel

Roxana Hutanu
Dept. of Physics, Queen's University

Time
Tue. February 11, 2003     11:30 AM     Stirling A

Abstract

Residual stresses are very important for the industrial applications of the engineering materials since they can lead to unexpected failures of these materials. The influence of stress and residual stresses on the magnetic properties of materials is not completely understood. Magnetic Barkhausen Noise (MBN) is one of the few non-destructive techniques able to determine the existence of residual strains in ferromagnetic samples such as steels. Intergranular residual strains are the microscopic residual strains which were found, using neutron diffraction method, to be quite large along the [002] directions for most of the steels and alloys. [002] is also the magnetic easy axis in steels. Our MBN and neutron diffraction data showed that there is a direct correlation between the MBN signals and the intergranular residual strains present in mild steel samples. The ultimate goal is to find a mathematical dependence of the MBN signal energy on a specific applied/residual stress.

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