About this Abstract |
Meeting |
Materials Science & Technology 2020
|
Symposium
|
Additive Manufacturing: Materials, Alloy Development, Microstructure and Properties
|
Presentation Title |
Microstructure Analysis of Laser Additive Manufactured 316L Stainless Steel |
Author(s) |
Sudhakar Vadiraja, Penn Rawn |
On-Site Speaker (Planned) |
Sudhakar Vadiraja |
Abstract Scope |
The objective of this research is to investigate the microstructures of 316L stainless steel produced by laser additive manufacturing (LAM), as a function of build angle orientations and global energy densities. Microstructures were characterized using a Leica DM750P optical microscope, paired with Leica application suite software. Microstructure studies revealed that the grain size was only marginally affected by the build angle orientation. Higher energy density samples showed relatively coarser cellular structure with highly aligned dendritic morphology. At relatively lower energy densities, several large faceted voids were observed with unfused powder particles within the voids. Micro-voids were minimal and almost no unmelted particles were noticed at relatively higher GED values, due to more complete melting conditions. A combination of fine and coarse cellular structures was observed for 30° build angle orientation samples as opposed to only very fine cellular or dendritic structures for the 0° orientation samples. |