| Abstract Scope |
A multiscale materials modelling framework is presented for simulating microstructure and mechanical fields during selective laser melting (SLM) of a precipitate strengthened nickel-based superalloy. This approach encompasses various physical phenomena across multiple spatial and temporal scales, including solid-liquid-vapor transitions, solidification microstructures such as grains and precipitation of γ' particles. To accurately capture the complex behavior of the material, a crystal plasticity model is developed. This model takes into account the dissolution and reprecipitation of γ' particles as well as stress jumps acting on grain boundaries. By analysing the location of these boundaries relative to the passing melt pool, areas with a high risk of crack formation in the build are identified and discussed in relation to the process parameters. Furthermore, the simulation results reveal that additively manufactured parts made from high volume fraction γ' alloys are prone to creep fracture, highlighting the importance of considering creep response in these materials. |