|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Applications of Solidification Fundamentals
||Ultrafast Dynamics of Solidification and Thermal Strain Evolution in Laser Powder Bed Additive Manufacturing Using High Energy X-ray Diffraction
||Adrita Dass, Chenxi Tian, Shonak Bhattacharya, Darren Pagan, Atieh Moridi
|On-Site Speaker (Planned)
Understanding solidification behaviour during metal additive manufacturing (AM) is essential, as it directly influences final microstructures and residual strain states. Many efforts in this domain are based on numerical and computational approaches. Some studies focus on experimental determination of these parameters through in-situ monitoring including pyrometry, IR imaging or synchrotron x-ray imaging. However, these methods cannot directly measure the changes in lattice parameters in real-time, which is necessary for estimating transient parameters like thermal gradient and cooling rates. Here, we demonstrate a novel approach using in-situ synchrotron x-ray diffraction to accurately measure solidification parameters during laser powder bed AM of Inconel 625 and Stainless Steel 304. Using this approach, we calculate the melt pool and mushy zone dimensions, along with real-time thermal gradient, cooling rate and solidification front velocity. The effect of material properties and processing parameters on solidification parameters are discussed and compared with other approaches in the literature.