Consideration of Magnetic Measurements for Characterisation of Ferrite–Martensite Commercial Dual-Phase (DP) Steel and Basis for Optimisation of the Operating Magnetic Field for Open Loop Deployable Sensors

The magnetic properties of commercial dual-phase (DP) steels (DP600, DP800 and DP1000 grades) were evaluated using initial permeability, incremental permeability coercivity correlated with the key microstructural differences between grades. ferrite grain sizes fractions have been compared parameters obtained from minor major magnetisation loops within each DP grade. It has revealed that increases applied field amplitude to reach a peak then drops at higher field, values being different for three grades lower converging similar value high field. effects size phase fraction on are considered, it shown influence boundaries is more dominant than effect in steel samples. An analysis correlation tensile strength shows provides slightly better prediction examined, which believed be due fact combination reversible irreversible domain components affect value, while predominantly affected by movements. Based trend EM sensor (EMspec) operating parameters, lift-off hence sensitivity can assessed.