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Microstructural attributes such as grain size d and dislocation density ζd affect the hysteretic magnetic properties of steels because they affect domain wall movement and pinning. In an earlier paper, a model was proposed for computing hysteresis loops based on the effect of grain size and dislocation density. In that paper, hysteresis loops were compared that all had the same maximum field Hmax. The result was that coercivity departed from linear relationships with inverse grain size (viz. 1/d) and ζd12/ for large values of 1/d and ζd12/. The same was true of hysteresis loss WH, except that hysteresis loss even showed a peak, first increasing and then decreasing with increasing 1/d and ζd12/. This kind of behavior had not been seen by experimenters, particularly core-loss people. It was learned that the core-loss experimenters compared hysteresis loops of the same maximum flux density Bmax instead of the same Hmax. In this paper, we use the model previously formulated to produce hysteresis loops with the same Bmax. Indeed, the appropriate linear relationships are found. The paper also addresses effects of uniaxial anisotropy on these microstructural magnetic effects and why two hysteresis parameters are affected by microstructural variation.
Date of Publication: Sept. 2003