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Abstract
The relationship between the amplitude of magnetoacoustic emission and the residual magnetic induction of the materials is shown. The dependence of magnetoacoustic emission (MAE) on the frequency of magnetization reversal of a group of steels of different chemical composition was investigated. In all the investigated cases, the MAE amplitude maximum corresponds to a field frequency of 3-5 Hz. The magnetic properties of two groups of steels subjected to various thermal treatments have been studied. It is shown that the residual magnetic induction of steels is a sufficiently universal parameter for controlling softening thermal treatments and that the amplitude of magnetoacoustic emission can be used as a testing parameter in scanning systems of structurescopy of ferromagnetic steels.
Highlights
At the core of magnetic structurecopy of steel products lies the presence of a correlation between magnetic and hardness properties
One of such effects is magnetoacoustic emission (MAE), which is understood as a totality of elastic vibrations that arise in a ferromagnet upon its magnetization reversal
To determine the character of the dependence of the amplitude of the MAE on the frequency of the magnetization reversal UMAE for a group of samples with different structural-phase states, magnetoacoustic measurements were made on the described setup with solenoid 1 (Fig. 1)
Summary
At the core of magnetic structurecopy of steel products lies the presence of a correlation between magnetic and hardness properties. Additional information can be acquired by parameters related to interaction of moving domain walls with defects of the crystal structure. One of such effects is magnetoacoustic emission (MAE), which is understood as a totality of elastic vibrations that arise in a ferromagnet upon its magnetization reversal. In the case of low-frequency magnetization reversal of ferromagnets, the main mechanism of MAE is magnetostriction, which manifests itself in a change of the sample size (magnetostriction), as well as in the appearance of local elastic perturbations, mainly caused by irreversible displacements of 90-degree domain walls (magnetic noise). Magnetoacoustic emission makes it possible to register jumps of domain boundaries near the surface, and in the volume of the material [1, 2]
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