| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Designing Complex Microstructures through Additive Manufacturing
|
| Presentation Title |
Processing-microstructure relationships in ferrous alloys via mixed powder laser powder bed fusion |
| Author(s) |
Mustafa Tobah, Zenan Zhang, Mohsen Taheri Andani, Veera Sundararaghavan, Amit Misra |
| On-Site Speaker (Planned) |
Mustafa Tobah |
| Abstract Scope |
Three different approaches using a powder mixture of duplex stainless steel 2507 and austenitic stainless steel 316L were examined to understand phase formation in powder bed fusion – laser beam (PBF-LB): (i) in situ reheating, (ii) utilization of an island scan strategy, and (iii) switching process parameters between layers of a build. Analytical modeling was combined with thermodynamic simulation to explain the phase formation measured experimentally. The results indicated that the reheating from additional layers was critical to the nucleation of austenite. This was found in the islanding scan strategy sample where the corners of the islands showed significantly less austenite (~45%) as compared to the centers of the islands (~96%), and in the multi-layer sample where alternating laser power varied austenite content from ~75% (lower power) to ~90% (higher power). In addition, in situ reheating minimally increased the austenite content by maintaining the layer above the austenite nucleation temperature. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Phase Transformations, |