Magnetic Barkhausen Noise for Characterization of Recovery and Recrystallization

Nondestructive examination of recovery stage during annealing of a cold-rolled low-carbon steel using eddy current testing technique

“…EC output drop is a conclusive proof which shows that the strain free grains are appearing at a suitable rate, so grain refinement (increases magnetic permeability) has a dominant effect as compared to dislocation density reduction (decreases magnetic permeability), which is consistent with the results of other authors[2]. In addition, this series of experimental results are consistent with those obtained by Gurruchaga et al,[33], for the case of annealing a cold-rolled high carbon steel at the temperatures in the range of 300 to 575 °C for different periods of time by means of magnetic Barkhausen noise non-destructive method. They have shown that the amplitude of the magnetic Barkhausen noise envelopes increased progressively with annealing time at the lower annealing temperatures (300-500 °C).…”

Effect of anisotropic microstructure on magnetic Barkhausen noise in cold rolled low carbon steel

“…Thus the increasing dispersion of the carbon precipitates leads to an increase of the MBN value. Partial recrystalization creates bigger grain widths only in the central region which causes a strong decrease of the MBN noise [5]. The opposite contributions of the secondary phase particles and the recrystalization can explain the local maximum at the quarter of the depth.…”

“…The MBN depends both on the microstructure and the internal stresses. MBN is most often applied to follow damage accumulation, development of internal stresses, changes of microstructure [1][2][3][4][5], effects of applied stresses [6,7] and cold rolling [8,9].…”

“…Kim and Kwon [4] studied the degradation effect in ultrafine-grained steel and concluded that the non-magnetic particles and grain size have the most important effect in unstressed samples. Recently Gurruchaga and et al [5] investigated the effect of heat treatment on MBN in cold rolled low carbon steels. Depending on the time and temperature of the heat treatment, they could induce partial recovery and recrystalization.…”

Adaptive Testing of Ferromagnetic Materials Utilizing Barkhausen Noise

“…Magnetization processes are closely linked not only to these structural defects, but also to the other properties of the sample, such as the uniformity, texture, and the sample shape. The BN measurements are therefore widely used as nondestructive evaluation techniques for inspection of ferromagnetic materials, including the assessment of dislocation density [1], grain size [2], recovery and recrystallization [3], fatigue [4], and eects of applied stresses [2].…”