About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
In-Situ Monitoring and Control of Solidification & Deformation Processes in Metal Additive Manufacturing
|
| Presentation Title |
Processing-Microstructure-Mechanical Behavior Relationships in Ferrous Alloys via Mixed Powder Laser Powder Bed Fusion |
| Author(s) |
Mustafa Tobah, Zenan Zhang, Mohsen Taheri Andani, Arkajit Ghosh, Veera Sundararaghavan, Amit Misra |
| On-Site Speaker (Planned) |
Mustafa Tobah |
| Abstract Scope |
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) utilization of an island scan strategy and (ii) switching process parameters between layers. Analytical modeling and thermodynamic simulation were used to explain the observations. The results indicated that the reheating from additional layers was critical to the austenite formation. This was found in the islanding scan strategy 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). Additionally, higher yield strength and ductility was measured beyond what would be predicted by rule-of-mixtures due to an increase in the Hall-Petch coefficient and a twin induced plasticity (TWIP) type effect. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Phase Transformations, Characterization |