About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing of Metals: Applications of Solidification Fundamentals
|
Presentation Title |
Interface Characteristics of a 2205 Duplex Stainless Steel Processed by Laser Powder Bed Fusion Additive Manufacturing |
Author(s) |
Nima Haghdadi, Hansheng Chen, Zibin Chen, Sudarsanam S. Babu, Xiaozhou Liao, Simon P Ringer, Sophie Primig |
On-Site Speaker (Planned) |
Nima Haghdadi |
Abstract Scope |
Thermal gyrations during metals additive manufacturing (AM) may lead to microstructural complexities, particularly at interfaces. In this study, using advanced characterization techniques, we unveil some of such phenomena in a duplex stainless steel processed by laser powder bed fusion. For the austenite-ferrite interfaces, ferrite grains are shown to have a higher tendency to terminate on (100) habit planes instead of crystallographically and energetically favoured (110) planes. This is due to the character of parent ferrite-ferrite boundaries, dictated by the sharp <100> texture, and the geometry of austenite grains, enforced by directional solidification and epitaxial growth of ferrite in AM. We also report local fluctuations in Fe and Cr contents in regions adjacent to ferrite-ferrite grain boundaries, providing Cr-rich precursors for Cr2N formation. This is believed to be due to increased thermal gyrations and stresses associated with AM, triggering non-equilibrium grain boundary segregation. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Iron and Steel, Characterization |