| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Frontiers in Solidification Science VIII
|
| Presentation Title |
In Situ Quantification of Degenerate Graphite Nodule Formation during the Solidification of Ductile Cast Iron |
| Author(s) |
Tim Wigger, Tito Andriollo, Mohammed Azeem, Chaoling Xu, Samuel J. Clark, Robert Atwood, Niels Tiedje, Peter D. Lee |
| On-Site Speaker (Planned) |
Tim Wigger |
| Abstract Scope |
Ductile cast iron is of increasing importance for the transportation and renewable energy sectors. A critical factor for the mechanical characteristics of ductile iron castings is the morphology of the embedded graphite nodules, which can degenerate during solidification, degrading the material properties. In situ time resolved high-speed synchrotron X-ray tomography was used to capture the evolution of graphite nodules during solidification of cast iron, capturing the evolution of degenerate features and the carbon concentration field in the matrix. The results reveal that the dendritic austenitic phase and the distribution of the carbon concentration in the surrounding liquid phase control the graphite morphology. Changes in the sphericity of the nodule population under varying conditions are examined, showing an increase in degeneration with increasing cooling rates. These results support the validation and development of predictive numerical models and give insights into the solidification kinetics and design of advanced cast iron alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Solidification, Modeling and Simulation |