Study of cold-deformed state of steel Fe360-B based on the magnetic Barkhausen noise effect

The magnetic Barkhausen effect is a phenomenon occurring during magnetization of ferromagnetic materials and related to movements of magnetic domains under the influence of an alternating magnetic field. The Barkhausen noise is a collection of all information on a material; hence voltage signals can be captured, processed and compared to equal signals from the materials having specified properties. In the investigation, a deep-drawing steel Fe 360-B according to ISO standard in the soft condition, in the form of plate and strips having various initial thicknesses, which were subsequently cold rolled to a uniform thickness, was used. The study is based on an analysis of the voltage signal of the magnetic Barkhausen noise by means of its maximum amplitude, an analysis of its power spectra, and a comparison of the voltage-signal power. Direct determination of the degree of cold deformation can be performed by means of the calibration curve or by appropriate software support which transforms the signal obtained directly into the material property required.