| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Process-induced Microstructures and Defects
|
| Presentation Title |
Giant Supersaturation of Interstitial Light Atoms in Laser Powder Bed Fusion Processed Stainless Steel 316L via Solute Trapping |
| Author(s) |
Xiaolei Guo, Hsien-Lien Huang, Menglin Zhu, Karthikeyan Hariharan, Szu-Chia Chien, Ngan Huynh, Jinwoo Hwang, Wolfgang Windl, Christopher Taylor, Eric Schindelholz, Gerald Frankel |
| On-Site Speaker (Planned) |
Xiaolei Guo |
| Abstract Scope |
Stainless steels prepared via laser powder bed fusion (LPBF) often have a higher concentration of oxygen than the same materials manufactured via conventional routes. Here we show that the extremely fast cooling rate (106-107 K/s) associated with the LPBF processes can result in giant supersaturation of interstitial light atoms, such as oxygen and nitrogen, in the alloy substrate. Atomic resolution scanning transmission electron microscopy and density functional theory calculation reveal that the interstitial light atoms exist in the octahedral sites and bond with neighboring metal atoms. Our calculations show that the co-existence of interstitial oxygen and oxide inclusions is because the diffusive speed of oxygen atoms in the melt is on the same order of magnitude of the solidification rate, leading to the co-existence of solute trapping and solute segregation in the same alloy. The resulting microstructures may have profound effects on the physicochemical properties of the LPBF-produced alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Iron and Steel |