Abstract Scope |
During metal additive manufacturing (AM), just after melting of feedstock, the molten material rapidly solidifies. Then, for the remaining build time, it is subjected to solid-state thermal cycling (SSTC). Until recently, worldwide research efforts were heavily focused on studying the role of solidification to obtain as-built microstructures; much less focus was on studying the role of SSTC. Studying the role of SSTC is important because SSTC-induced thermo-mechanical driving forces can trigger micro-mechanisms (e.g., dislocation dynamics, phase transformations, precipitation, etc.) that can significantly alter the as-solidified microstructure and determine the as-built material’s subsequent response. In my group, we develop and use experiment-modeling synergies to study SSTC-induced microstructure evolution. In this overview talk, I will present some of our latest experiment (in-situ synchrotron XRD and electron microscopy studies) and modeling (dislocation thermo-mechanics and crystal plasticity) work. Details on each of these topics will be given in other presentations at TMS. |