铁磁材料磁力学声发射的频谱特征

MAE Spectrum Characteristics of Ferromagnetic Materials

研究了三种不同材料在不同应力下的磁力学声发射频谱特征,发现变化磁场对磁力学声发射波形的作用.通过对波形主频率及频带宽度的比较,发现材料内部应力状态与磁力学声发射的频谱有密切关系.

The MAE (Magnetomechanical Acoustic Emissi on) is a kind of elastic wave induced by the irreversible movement of domain wall under the action of an externally applied alternating magnetic field. The MAE signal intensity depends heavily on the residual stress in materials. The MAE spectrum characteristics of three different materials have been studied in two types of stress state. It has been found that the MAE waveform and its frequency are affected by the external field intensity, residual stress and stress distribution in materials. The acoustic power spectrum density of MAE are quite different for different microstructures of materials. The more pearlite and Fe3C there are, the lower the MAE signal intensity will be.