Microstructure inspection by means of mechanical Barchausen[Barkhausen] effect analysis

This paper presents results of the application of the mechanical Barkhausen effect (MBE) for the evaluation ofthe strain dependence of magnetomechanical internal friction (MIF) and the internal stress distribution function. Both functions were obtained from the first load mechanical Barkhausen effect (MBE) strain dependence. The MBE intensity was measured with torque motor applying shear stress with constant time rate. This new method was tested for pure iron and Fe-C (160 ppm of C) alloy with different precipitation states. The evaluated strain dependence of the MIF was compared with the experimental MIF functions measured with a pendulum. It is sugested that the very close relationship between the two dependencies confirms the validity of the performed evaluation of the internal stress distribution function.