2, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States
3, Missouri University of Science and Technology, Rolla, Missouri, United States
In the field of metal additive manufacturing (AM, also known as 3D printing), the community, from the view of material science, are mainly facing two problems: one is how to eliminate defects (e.g. porosity) and residual stress, and the other is how to control the microstructures (e.g. grain and phase). Previously, we have demonstrated the applicability of high-speed synchrotron x-ray imaging and diffraction techniques at the Advanced Photon Source in probing the microstructural evolution during the metal AM process in real time. The temporal resolution can reach 100 ps and the spatial resolution can reach 1 μm/pixel. In this presentation, we will show the power of these hard x-ray techniques and map the road to rapid and precise controlling of the metal AM process. We believe our study will facilitate the understanding of laser-metal interaction, and pave the way to a more extensive application of metal additive manufacturing.