A new electronic grain-size analyser for technical steel

On-Line Inspection of Ferromagnetic Materials Using Magnetic NDE Methods

“…In general, their results also showed that the total number of magnetic Barkhausen noise pulses increased with increasing grain size in commercial steel [5]. In subsequent work [6], the total number of the magnetic Barkhausen noises and, in addition, MAE pulses, has been found to increase with increasing grain size in decarburized steel, in agreement with [2][3][4][5]. This indicates that the Barkhausen activity of both 180° domain walls and non-180° domain walls (90° in steel) increases in general with increasing grain size in steels.…”

“…4 and 5 respectively, is probably due to the presence of reversible domain wall translation as the dominant process for magnetization change. It has been observed in steel [2] that the size of domains increase with grain size. We assume that this domain sizegrain size correlation is also true for nickel.…”

“…One class of recently developed instruments for the nondestructive measurement of grain size make use of the magnetic Barkhausen effect [2][3][4][5]. However, these are calibrated empirically, since no theoretical interpretation of the dependence of the magnetic Barkhausen effect on grain size has been given.…”

Diagnosis of the structural state of bulk nano- and submicrocrystalline magnetically soft materials

“…A new promising direction for the application of the Barkhausen effect method was discovered by M. Otala and S. Säynayäkangas [5] who revealed a close correlation between the average grain size in a cold rolled steel and the most probable magnitude of the Barkhausen jump. It was also considered in the papers on the determination of grain size and anisotropy [6,7].…”