Speaker
Description
High-manganese steels (HMnS), which are the member of advanced high-strength steel (AHSS) class, stand out due to their ability to exhibit both high strength and ductility. They are identified as promising alloys for additive manufacturing, which is a novel method enabling the production of metallic structures with complex geometries such as lattice (cellular) structures for lightweight applications with high energy absorption capacity.
In HMnS, different deformation mechanisms such as transformation-induced plasticity (TRIP) and twinning-induced plasticity (TWIP) are activated by tailoring stacking fault energy via alloy design approach. Therefore, in addition to dislocation slip, twinning and ε-martensite transformation can be accommodated in HMnS as crystallographic deformation mechanisms. The underlying phenomena of these deformation mechanisms can be incorporated into a physics-based constitutive model in order to simulate the crystal plasticity behaviour of HMnS.
In this presentation, the effect of micro- and/or meso-structural features (related to additive manufacturing process), e.g., crystallographic texture and grain morphology, on the mechanical properties, which was determined by means of crystal plasticity simulations, will be discussed. In addition to bulk structures, lattice structures will also be explored. Thereby, a robust linkage between structure and properties, which correlates microstructural heterogeneity of additively manufactured HMnS with anisotropic mechanical behaviour, will be established.
| Speaker Country | Germany |
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