| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Designing Complex Microstructures through Additive Manufacturing
|
| Presentation Title |
New insights into the microstructural evolution and mechanical properties of 17-4PH SS developed during laser powder bed fusion |
| Author(s) |
Mahsa Amiri, Zahra Zanjani Foumani, Penghui Cao, Ramin Bostanabad, Lorenzo Valdevit |
| On-Site Speaker (Planned) |
Mahsa Amiri |
| Abstract Scope |
Microstructural evolution of 17-4PH SS during LPBF under varying processing conditions, each leading to unique mechanical properties is investigated. The microstructure of LPBFed17-4PH SS samples consists of martensitic structures with variations in ferrite and retained austenite. Thorough microstructural and chemical analysis via EBSD, high-resolution TEM and XRF, combined with computational thermal FEA are utilized to understand the effect of the in-situ heating and cooling cycles caused by the variations in processing parameters. In-situ thermal cycles, albeit happening in short time intervals, and the resulting chemical composition changes due to the evaporation of elements, define the final material’s microstructure, and therefore mechanical performance of LPBFed 17-4PH SS. Large lath martensitic structure, with 100-200 nm size precipitates results in extremely high strength and low ductility. Optimal tensile performance is associated with the formation of fine martensite laths and fine grains of ferrite, with a higher content of nanosized precipitates. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Mechanical Properties |