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International 2015 Materials Education Symposium

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Simulation of microstructure evolution with Cambridge Engineering Selector

Dr Wolfgang Pantleon | Technical University of Denmark, Denmark

Simulation of microstructure evolution with Cambridge Engineering Selector

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Within the Cambridge Engineering Selector, materials are generally presented as entities with a set of known physical properties. For any given material, specific properties may vary within a certain range, but neither the physical origin of the variation, nor the influence of processing of a material on its properties is revealed. In this manner, insight in the enormous potential for tailoring properties by, for instance, thermo-mechanical treatments is hindered. In order to overcome this limitation, an approach is presented to utilize the features of the hybrid synthesizer to simulate the property changes due to thermo-mechanical treatment. As a first application, annealing of deformed metals is considered. During annealing, the hard material representing the deformed state is replaced by softer material representing the recrystallized state. Adding both (the metal in the deformed state and the same metal in the recrystallized state) as two different new material records, material resulting from any chosen annealing treatment leading to partial recrystallization of the metal can be simulated using the hybrid synthesizer as composite of materials in the two states with respective properties. This approach cannot only be used to simulate the yield strength, under appropriate assumption, ultimate tensile strength and maximum uniform elongation of the partially recrystallized metal can be defined as well. In case of recrystallization, such a modeling in terms of a composite can be motivated straightforwardly. The same approach can be applied to work-hardening of metals. In this case, a description of work-hardened material as hypothetical composite of the undeformed state and the stationary state with saturating flow stress is completely unphysical. Nevertheless, the mathematically analogous governing equations allow treating work-hardening with the hybrid synthesizer as well. Both cases are presented and selected examples for illustrating the effects of annealing and plastic deformation on different mechanical properties discussed.