The Modeling Method Of Magnetic Hysteresis Loop And Barkhausen Noise For Two-phase Ferromagnetic Material

The preparation and development of dual-phase ferromagnetic materials have attracted widespread attention at home and abroad.For example,dual-phase steel composed of martensite and ferrite has been widely used in the lightweight automobile manufacturing industry.In the two-phase ferromagnetic material,the volume fraction of the single phase not only affects the mechanical properties of the material,but also affects the hysteresis loop of the material and the characteristics of the Barkhausen noise signal.By testing the magnetic properties of the material,the metallographic state can be evaluated non-destructively,and the mechanical properties of the material can be indirectly evaluated.However,at present,there is no mature model in theory to analyze the influence of the metallographic proportion of the two-phase material on the hysteresis loop of the material and the Barkhausen noise.Therefore,based on the classical JA hysteresis model and the Barkhausen noise prediction model,the hysteresis loop suitable for two-phase ferromagnetic materials is developed by introducing a transition function and improving the description function of the Barkhausen jump random process.Barkhausen noise theory model,and experimentally tested the hysteresis loop of the iron-cobalt dual phase material and the Barkhausen noise signal,compared with the theoretical prediction law.The main research contents include:(1)Modeling method for hysteresis loop of two-phase materialDifferent types of transition functions are used to describe the transition characteristics of JA equation parameters between two-phase materials.The hysteresis model of two-phase materials is established.The correspondence between the transition function form and the phase content is analyzed.The two-phase ratio of two phases is simulated.The hysteresis loop of the material quantitatively predicts the relationship between the two-phase ratio and the magnetic parameters such as coercivity and saturation magnetic induction.(2)Research on prediction model of two-phase material Barkhausen noiseStarting from the JA equation of the biphasic material,the description function of the Barkhausen jump random process is improved.The prediction effect of the traditional method and the improved method on the Barkhausen noise in the biphasic material is compared and analyzed,and the metallographic proportion is quantitatively analyzed.The variation of multiple characteristic parameters(peak,half-width,and coercive field)of the Barkhausen noise butterfly curve is changed.(3)Two-phase material hysteresis loop and Barkhausen noise detection experimentThe iron-cobalt dual phase materials with different ratios of two phases were prepared by powder sintering method.The sensor suitable for short column specimens was developed.The hysteresis loop and Barkhausen noise signal were measured.Combining genetic algorithm and J-A equation,the parameters of the single-phase material hysteresis loop of the experimental test were identified.Based on the theoretical model developed in this paper,the influence of metallographic proportion on the hysteresis loop and Barkhausen noise characteristic parameters is quantitatively predicted,and compared with the experimental test results.