Tensorial permeability microstructure model considering crystallographic texture and grain size for evaluation of magnetic anisotropy in polycrystalline steels

Abstract

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Non-Destructive Evaluation of Magnetic Anisotropy Associated with Crystallographic Texture of Interstitial Free Steels Using an Electromagnetic Sensor

“…A finite element microstructure model [24] that considers crystallographic texture using EBSD data has been used to predict the magnetic anisotropy in the IF steel samples. In this connection, a separate MATLAB code [25] was developed to generate polygons with continuous and smoothed grain boundaries from the EBSD data.…”

“…The permeability values along the <100> and <111> direction used in the texture model have been estimated by fitting with the experimental measurements. Full details for the model can be found in [24]. The modelling results have been experimentally validated using a laboratory based electromagnetic (EM) sensor [24].…”

“…Full details for the model can be found in [24]. The modelling results have been experimentally validated using a laboratory based electromagnetic (EM) sensor [24]. However, the equiaxed grains in IF-A are extremely fine indicating it is in the early stage of recrystallisation.…”

“…The three samples exhibit very different magnetic anisotropy as shown in the angular dependence of inductance and the predicted relative permeability illustrated in Figure 3 Figure 6 shows the EBSD data, FE modelled microstructural geometry and predicted effective low magnetic field permeability map for the IF-B sample, following the approach described in [24] for modelling texture effects. Regarding the quantitative ranges, it can also be seen that the texture model predicts a relatively small range for the three samples (range of 1500 -2200), whilst the EM sensor outputs including the inductance and the relative permeability show a relatively larger range, 1.27 to 2.42 mH, and 1100 to 2150 respectively.…”