| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Effects of Cooling Rate and Nitrogen Content on Morphologies and Precipitation of Widmanstätten Austenite in Welds of Duplex Stainless Steels |
| Author(s) |
Yunxing Xia, Fumikazu Miyasaka, Hisashi Serizawa, Hiroaki Mori |
| On-Site Speaker (Planned) |
Yunxing Xia |
| Abstract Scope |
Duplex stainless steels are renowned for their excellent corrosion resistance and high strength. However, during welding, the microstructural morphology and phase transformation remain crucial concerns, particularly regarding the significant impact of Widmanstätten austenite precipitation on performance. In this study, a polishing-based continuous sectioning system and on-site etching were used to reconstruct the 3D modeling of the Widmanstätten austenite microstructure. It clarified the differences of the Widmanstätten austenite in welds based on nitrogen content and different welding conditions. Furthermore, In contrast to 2D, 3D observations better reveal the morphological and arrangement variations of Widmanstätten austenite within the same region across different cross-sections. In 3D observations, most of the Widmanstätten austenite appeared connected, while in 2D observations, they seemed to be separated. Through EBSD analysis, it was also effectively demonstrated that there exists a certain relationship between the granular austenite within ferrite grains and the precipitated Widmanstätten austenite at the grain boundaries. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Solidification, Phase Transformations, Mechanical Properties |