About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Metals: Multiscale and Non-Equilibrium Solidification Fundamentals
|
| Presentation Title |
Mechanism of epitaxy loss and its correlation with solidification microstructure in Laser Powder Bed Fusion |
| Author(s) |
Prosenjit Biswas, Helge Heinrich, Ji Ma |
| On-Site Speaker (Planned) |
Prosenjit Biswas |
| Abstract Scope |
Although epitaxial growth from the substrate or previously deposited layers initially dominates grain development during Laser Powder Bed Fusion (LPBF), epitaxy is lost within a few subsequent layers, leading to the formation of new grains with different dendritic growth directions. However, the conditions and mechanisms driving the epitaxy loss are not fully understood, making it challenging to maintain a consistent texture in LPBF samples. In this study, we used a single-crystal SS316L substrate to investigate the mechanism of epitaxy loss and its correlation with dendritic microstructure evolution. We developed a correlative microscopy technique to simultaneously characterize three-dimensional grain structures and dendritic evolution during LPBF. Our results reveal that crystallographic misorientations form at each printed layer and gradually accumulate, creating a divergent dendritic growth condition where epitaxial growth becomes energetically unfavorable and new grains form. These insights are crucial for improving control over microstructure and texture formations in LPBF components. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Solidification, Characterization |