Diagnostics of austenitic steels by coercivity mapping

In this paper a novel application of magneto-optical films is described. This method is capable of mapping the coercivity with resolution as high as 50 μm with the magnetic field sensitivity of 100 A/m. The results thus obtained demonstrate the potential of the magneto-optical method when applied to the indication of positions on the surface of the austenitic steel that are critically degraded.