| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Processing Effects on Microstructure and Material Performance
|
| Presentation Title |
Laser Beam Shaping for the Additive Manufacturing of Metal Components with Reduced Texture and Equiaxed Grains |
| Author(s) |
Tien T. Roehling, John D. Roehling, Rongpei Shi, Saad A. Khairallah, Gabe M. Guss, Joseph T. McKeown, Manyalibo J. Matthews |
| On-Site Speaker (Planned) |
Tien T. Roehling |
| Abstract Scope |
Gaussian beam intensity profiles are standard in laser-based metals additive manufacturing, although recent work has shown that beam shaping could offer a feasible route towards microstructural control, at least in single melt tracks. In this study, 316L stainless steel parts were built using Gaussian and elliptical laser intensity profiles under identical conditions. Cross-hatching was achieved with custom instrumentation that allows non-circular beams to be rotated between layers. Microstructural characterization was performed using electron backscatter diffraction (EBSD) imaging. Using elliptical beams, some refinement of the columnar and equiaxed grains is achieved, but more importantly, the volume fraction occupied by equiaxed grains increases dramatically such that the average grain size is reduced by nearly 50%. Moreover, almost no texture exists in cubes built using an elliptical beam, while cellular growth of columnar grains along a preferred direction was found in cubes built using a Gaussian beam. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |