Characterization of Ground Steel Using Nondestructive Magnetic Barkhausen Noise Technique

Abstract

The present investigation utilizes the micromagnetic Barkhausen noise and hysteresis loop technique to evaluate the surface integrity of ground steel. The grinding experiment was performed on IS-2062 steel by varying the process parameters. The magnetic parameters such as root-mean-square value of Barkhausen noise signal and average permeability of hysteresis loop are correlated with surface integrity such as metallurgical changes, surface roughness, and residual stress of the ground surface. The result shows that microstructural alteration in the ground surface has insignificant effect on the measured magnetic parameter. The surface roughness value is obtained in the range (0.4279-0.6498 µm) which is very small and thus having insignificant contribution for variation in magnetic parameters. However, root-mean-square value as well as average permeability increases with the increase in peak shift of the XRD peak. The correlation coefficient between root-mean-square value and peak shift was observed to be 0.9707, and those between average permeability and peak shift was 0.9510. The present study shows that Barkhausen noise signal and hysteresis loop technique provides a new dimension in the characterization of the ground surface.