and Simulation 2

Contributed talk

Advances in scalebridging modelling of deformation and fracture in martensitic steels

Alexander Hartmaier, Ruhr-Universität Bochum, Bochum, Germany

In order to understand the mechanical performance of martensitic steels, which posses a hierarchical microstructure over several length scales, we need to describe plastic deformation of individual microstructural constituents, like laths, blocks and packets, on the relevant length scales. This is accomplished by applying crystal plasticity models for single crystalline regions in the microstructure and by introducing representative volume elements (RVE) of the rather complex microstructures.

It will be demonstrated how such RVE-based micromechanical simulations and homogenization methods can be applied to make predictions on macroscopic mechanical properties of tempered martensitic steels. This will also take into account the competition of plastic deformation and crack advance occurring in fracture mechanical testing.

Furthermore, it will be discussed how the relatively large number of input parameters that is needed for such micromechanical modeling can be obtained either by atomistic simulations or by sophisticated nano- and micromechanical experiments. It will be demonstrated that atomistically informed plasticity and fracture models are particularly promising tools to understand deformation and fracture of martensitic steels.

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