| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Defects and Properties of Cast Metals
|
| Presentation Title |
In-situ Synchrotron Examination of the Evolution and Transition of Nodular, Compacted and Laminar Graphite During Solidification of Cast Iron |
| Author(s) |
Chaoling Xu, Mohammed Azeem, Tim Wigger, Tito Andriollo, Samuel Clark, Zhixuan Gong, Zhixuan Gong, Robert Atwood, Peter Lee, Niels Skat Tiedje |
| On-Site Speaker (Planned) |
Tim Wigger |
| Abstract Scope |
In cast iron, graphite particles nucleate and grow simultaneously with the austenite matrix during solidification. The alloy composition and cooling rate are pivotal parameters controlling morphology and distribution of the graphite phase, and thus the resultant mechanical properties of the material. In-situ time resolved synchrotron tomography was used to dynamically capture the evolution of three different morphologies of graphite during solidification: nodular, compacted and laminar graphite. By running various thermal cycles, the precipitation kinetics and the transitions between different graphite morphologies were quantitatively evaluated for the first time. With ex-situ cyclic heating experiments, computed tomography, SEM and energy-dispersive X-ray spectroscopy, a correlation between formation of different graphite types and changes in chemical composition and cooling rates is established. These results provide invaluable data for the validation and development of predictive numerical models and give insights for the further understanding of solidification kinetics and design of advanced cast iron alloys. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |