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 magnetisati on 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 ha ving specified properties. In the investigation, a deep-drawing steel Fe 36 0-B according to ISO standard in the soft condition, in the form of plate a nd strips having various initial thickness, which were subsequently cold ro lled 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 maximu m amplitude, an analysis of its power spectra, and a comparison of the volt age-signal power. Direct determination of the degree of cold deformation ca n be performed by means of the calibration curve or by appropriate software support which transforms the signal obtained directly into the material pr operty required.