Study on the applicability of the measurements of magnetoelastic properties for a nondestructive evaluation of thermally induced microstructure changes in the P91 grade steel

Application of Extended Jiles-Atherton Model for Modelling the Influence of Stresses on Magnetic Characteristics of the Construction Steel

“…This eect was widely investigated in soft magnetic alloys, both amorphous [2] and nanocrystaline [3] due to the possibility of development of robust force sensors [4]. Moreover, magnetoelastic eect is signicant from the point of view of development of new methods of non-destructive testing of the ferromagnetic materials, mainly steels [5].…”

On the Application of Magnetoacoustic Emission for a Nondestructive Assessment of the Post Welding Heat Treatment of High Chromium Steel Weld Seams

“…The combined amplification was 120 dB, the 30 dB of which was realised with the help of a close to the transducer pre-amplifier. The X20 samples were investigated with the help of the magnetising system described in [13], equipped with flat, unmovable poles and magnetizing probe encircling the sample. In the case of those samples, thanks to their regular shape it was possible to use the same setup to measure their magnetic properties (quasi static hysteresis loops).…”

“…The MAE phenomenon was for the first time investigated in a systematic way by Lord [11] in 1975 and then in 1981 proposed by Shibata and Ono [12] as a nondestructive tool of stress measurement. It has already been shown that the MAE signal in martensitic steels is strongly dependent on the dislocation density, the change of which can be caused either by tempering process [13] or plastic deformation [14]. The MAE is a phenomenon of acoustic pulse generation during an irreversible jump of a domain wall (DW) inside the material with non-zero magnetostriction.…”

Investigation of the Evolution of Magnetic and Acoustic Characteristics as a Result of Annealing of Cold-Deformed Nickel

“…In works [1][2][3][4][5][6] and a number of other works it was shown that the determination of the set of magnetic and magnetoacoustic characteristics makes it possible to reliably assess the structural-phase state, strength properties, as well as the stresses present in ferromagnetic materials. This possibility is due to the following reasons: 1) the interaction of moving domain boundaries with defects in the crystal structure and inhomogeneous stresses; 2) magnetoelastic effect -a change in magnetization and a change in the dynamics of 90degree domain walls when elastic stresses are applied to a ferromagnet; 3) magnetostrictive effect -a local change in the size of the ferromagnet due to the rearrangement of the domain structure.…”