Sneha Prabha Narra, Doctoral Student, Carnegie Mellon University
In this presentation, solidification microstructure control across alloy systems and Additive Manufacturing (AM) processes is demonstrated, including location-specific control of microstructure within a target component. Fabrication of components with tailored, application-specific properties has been a long-term goal for AM. Based on previous work on integrated microstructure and melt pool geometry control, relationships between primary process parameters, melt pool geometry and resulting solidification microstructure are presented for different additive alloy systems. These relationships are then applied to the understanding of transitions in microstructure with changes in process variables. Toward this goal, a series of experiments ranging from single beads to solid blocks to a target component are performed by varying specific process inputs. Results demonstrate that the approach for integrated control of melt pool geometry and solidification microstructure is alloy independent and is a useful means for fabricating components with desired, location-specific properties.