Abstract

Magnetic Barkhausen noise (MBN) measured from ferromagnetic materials contains very fruitful information about the condition of microstructure and residual stress. In this study, specimens of 45 steel and 30Cr steel were subjected to surface laser quenching, which induce changes in both microstructures and residual stress in the tested materials. First, high resolution MBN inspection is applied to contour the profile of MBN parameters along the line perpendicular to the laser moving direction. Second, the residual stress and surface hardness are measured by X-ray diffraction method and Vickers micro-hardness tester, respectively. Third, the effect of microstructure (represented by surface hardness) and residual stress on the MBN parameters (peak height and peak position of the bufferfly MBN profile) is investigated. Linear correlation between the MBN parameters and the surface hardness or the residual stress can be concluded. Finally, the weights of two factors affecting the MBN parameters are simply discussed.

How to Cite:

Liu, X. ., Shang, W. . & He, C. ., (2019) “Effect of microstructure and residual stress on the magnetic Barkhausen noise signal”, Review of Progress in Quantitative Nondestructive Evaluation .