| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Processing Effects on Microstructure and Material Performance
|
| Presentation Title |
A-91: Controlling Microstructural Evolution in Metal Additive Manufacturing Using Bessel Beams |
| Author(s) |
Thej Tumkur, Sheldon Wu, Tien T. Roehling, John D. Roehling, Saad A. Khairallah, Sullivan Figurskey, Devon Courtwright, Michael Crumb, Manyalibo J. Matthews |
| On-Site Speaker (Planned) |
Thej Tumkur |
| Abstract Scope |
We report on the generation of non-conventional Bessel beams and their efficacy in enabling advanced microstructural control in laser-based metal additive manufacturing. Bessel beams have been utilized for high-resolution microscopy and precision laser machining, owing to their extended depth of focus compared to traditional beam shapes. In our studies, the effect of a larger depth of focus in Bessel beams (compared to Gaussian beams) was evident from the morphology and microstructures of single tracks produced by laser powder bed fusion of stainless steel powders. We will discuss the significance of our experiments, supported by modeling, in relation to the degree of tolerance for positioning of the focal plane, and for achieving greater control over thermal and microstructural evolution of melt pool profiles during selective laser melting.
Prepared by LLNL under Contract DE-AC52-07NA27344, supported by the Office of Laboratory Directed Research and Development (LDRD), tracking number 18-SI-003. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |