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Micromechanical modelling of the integrated microstructural features effect on mechanical behaviours

By Wenqi Liu (IEHK RWTH Aachen University)
Co-authors: Junhe Lian (IEHK RWTH Aachen University)
Sebastian M√ľnstermann (IEHK RWTH Aachen University)

The aim of this study is to develop a micromechanical modelling approach to relate the integrated microstructural features to the mechanical property profiles for the dual-phase steel. A reference dual-phase steel, DP1000, is used for microscopic models development and validation. For the linking between the microstructure features and the mechanical properties in this computer-assisted micromechanical approach, the representative microstructure model is employed allowing consideration of the microstructure parameters and at the same time bridging the equivalent quantities from microstructure to macroscopic level by incorporating a crystal plasticity material model. To balance the representativeness and computational capability of the 3D representative volume elements (RVEs), the extensive study is performed on the generation of the RVE considering the effects of RVE size, mesh discretization, and boundary condition. Nanoindentation tests are carried out on both ferrite and martensite to calibrate the crystal plasticity parameters. The micromechanical models are validated by uniaxial tensile test, with which the flow curve of the reference material is naturally captured. The effects of the integrated microstructural features, such as phase fraction, grain size, grain shape, texture, and second phase morphology et.al., on the macroscopic mechanics are predicted by the micromechanical models.

Ⓒ Photos:Toerisme Leuven