Abstract
The quantitative characterisation of microstructure is necessary for the prediction of material properties. In highly inhomogeneous microstructures with a wide range of grain sizes, the problem arises of defining an effective average grain size. Current contribution presents a method for the estimation of effective average grain size and a parameter describing the homogeneity of microstructure. The principal types of non-oriented electrical steels under investigation are defined. The effective average grain size is calculated as a weighted sum of the average grain sizes of homogeneous grain groups. Comparison of modelled data by the presented method and estimated by National Standards confirms inapplicability of the latter in case of the highly-inhomogeneous microstructure.
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