Evaluation of Hydrogen-Induced Degradation of Steel Through Multispectral Analysis of Magnetic Barkhausen Noise

This article presents the evaluation of hydrogen degradation in AISI 4340 steel based on the multispectral analysis of magnetic Barkhausen noise (MBN). Previous studies using acoustic and magnetic response of the Barkhausen effect have shown a large change in the course of the phenomenon as a result of the progression of hydrogen destruction of steel, and the applied time-frequency analysis has been limited to aggregated data in a few frequency bands. Thus, due to the complex nature of changes in the Barkhausen noise course, this study uses the analysis of the multidomain representation of the measured signals, enabling a broad characterization of various aspects of obtained signal distributions by multiple feature assessment.