| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Performance Steels
|
| Presentation Title |
Austenite Grain Growth in As-Cast Line Pipe Steels |
| Author(s) |
Min-Yu Tseng, Matthias Militzer, Warren Poole, Ruth Birch |
| On-Site Speaker (Planned) |
Min-Yu Tseng |
| Abstract Scope |
Line-pipe steels are typically Ti-Nb microalloyed steels where Ti-rich precipitates form during casting with the aim to control austenite grain size. The role of these precipitates on austenite grain growth in samples of as-cast slabs has been investigated during Gleeble simulated reheating conditions and compared with grain growth in hot-worked samples. Monitoring the austenite grain size evolution in-situ using laser ultrasonics (LUS) confirmed the expected grain growth behavior in the hot-worked samples but not in the as-cast slabs where the LUS data were inconclusive. Electron Backscattered Diffraction (EBSD) parent austenite reconstructions reveal that complex microstructures form during reheating of the as-cast samples consisting of a few large grains (>200 μm) with many fine grains embedded in rows within the large grains. This austenite grain structure complexity can be attributed to segregation of the precipitate forming elements into the inter dendritic liquid. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Solidification, Phase Transformations |