To the Question about the Thickness of Informative Layer in Magnetic-Noise Testing

The question about the thickness of informative layer under magnetic-noise testing of hardened layers is considered in 1–7], where it is estimated to be up to 800 μm. This paper presents experimental studies of the thickness of informative layer using instances of technologies used for surface-deformation and laser thermal hardening processes. It is shown that in the latter case, the thickness of informative layer is of greater importance. Applied mechanical stresses practically do not change the thickness of informative layer for a wide class of steels.