Abstract
In the contribution possibilities of evaluation of the quantities connected with microstructural grain layouts are discussed in the case of heterogenous grain size distributions. The microstructures of real materials together with the etalon and computer simulated structures were used. The following theoretical models were applied: planar Voronoi tesse-lations generated by the Poisson point process, by the cluster process and by the oscillating square lattice process. Complex problems connected with modelling and evaluation of the grain size distribution in real microstructures are shown.

Key words
microstructure, Poisson point process, grain size distributions, cluster process

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