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University of Zenica , Zenica , Bosnia and Herzegovina
AG der Dillinger Hüttenwerke, Germany Germany
Dual phase steels are low carbon steels which are thermo-mechanically processed to getting better formability and toughness than ferrite-perlite steels with similar tensile strength. The microstructure of these steels consisting of a ferrite matrix with hard martensitic/ bainitic second phase. The concept of representative volume element (RVE) is critical to understand and predict the behavior of effective parameters of steels. The RVE is considered to be a partial volume of the material, which is statistically homogeneous from the macroscopic point of view. In this paper determination of the representative volume of two dual phase steels (one with a martensitic and the second with a bainitic) is presented. Multiple samples are excised from the total volume of tomography and different parameters are observed to get the smallest RVE with stabile parameters. Results show that size of reduced volume has an influence on the parameterstability, while position of the observed reduced volume has not.
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