Mohamed M Blaow
University of Misurata, Libya
Title: Effect of detection distance on Barkhausen noise profile in temper rolled and cold rolled low carbon steel
Biography
Biography: Mohamed M Blaow
Abstract
Magnetic Barkhausen noise (MBN) measurements were performed using two low carbon steel plates of 1 mm thickness. A full annealed, temper rolled and a cold rolled plates of 400 mm2 area were tested. The measurements were conducted along the rolling direction and transverse to it in both plates. The detection search coil was initially placed at the magnetizing yoke and then it was displaced away from the yoke in predetermined steps. The intensity of the Barkhausen signals decreased as a function of detection distance from the magnetizing yoke in both directions. However, the Barkhausen noise profile shape changed from a single peak when the detection coil between the yoke legs to two peaks profile as soon as the detection search coil was displaced from the yoke in the temper rolled plates. The result indicated also that the two peaks profiles in the temper rolled plate were sharper along the transverse direction than in the rolling direction. The appearance of two peaks profile in the temper rolled plate may be attributed to different magnetisation directions the temper rolled plate which were detected by distorted profiles. The single peak Barkhausen noise decreased linearly as a function of detection distance in both directions in the cold rolled plate, which may be attributed to the high dislocation density. The result indicates that the magnetisation process in the steel plates is strongly affected by dislocations within the magnetized landscape.