Experiment-based modeling of the correlation between metallurgical processing, 3D microstructure evolution and mechanical properties of pearlitic nodular cast iron

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The present project proposal aims at establishing an integrated simulation chain for the prediction and targeted adjustment of the 3D microstructure development and associated effective properties as a function of the metallurgical process parameters. The project thus contributes significantly to an improved understanding and more efficient use of the correlation between metallurgical process control, spatial microstructure development and mechanical properties of nodular pearlitic cast iron. The morphological diversity of the graphite-pearlite microstructure offers the general possibility of covering a wide range of mechanical properties. Up to now, however, there has been a lack of numerical design tools with which the desired microstructures can be adjusted in a targeted and reproducible manner with regard to application-relevant requirements. In addition to the combination of proven simulation methods, the modeling of a continuous chain of effects first requires their cast-iron-specific extension. This requires a sound understanding of the origin and effect of the individual microstructure and alloy components. The present project proposal meets these challenges by closely integrating experimental and numerical work steps. For the conceptual design of the model approaches, the mechanisms of individual elements are first investigated experimentally on high-purity alloys. In the course of the project, the approach is extended to technical alloys by systematically extending the alloy system. The modeling of the simulation chain is divided into three main areas: a) nucleation and growth of the graphite phase, b) formation of the eutectoid pearlite matrix and c) constitutive behavior and damage mechanisms under monotonic loading.