On the critical behaviour of Barkhausen noise parameters in surface grinding

Abstract

An experimental study was undertaken to investigate the critical behaviour of Barkhausen noise (BN) parameters after surface grinding of medium carbon steel. The relations between residual stress and BN parameters were discussed in terms of degree of plastic deformation. The best parameter for residual stress evaluation is root mean square (rms) value of BN signal. In the present work, when the residual stress is more than the yield strength of the work material, the correlations between BN parameters, downfeed, residual stress, grain elongation and change in microhardness upon grinding have been investigated. X-ray diffraction (XRD), metallographic study and microhardness measurement of ground samples were studied. BN parameters were shown to increase with plastic deformation and then decrease with elevated level of plastic deformation. The results are explained in terms of mechanism that affects dislocation density as a function of grain elongation or plastic deformation and interaction of domain walls.