About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Frontiers in Solidification: An MPMD Symposium Honoring Jonathan A. Dantzig
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Presentation Title |
In situ Synchrotron Radiography Investigation of Graphite Nodule Evolution during Solidification in Ductile Cast Iron |
Author(s) |
Xiangmei Ding, Tim Wigger, Niels Tiedje, Yasuda Hideyuki, Narumi Taka, Jenny Shepherd, Peter Lee, Mohammed Azeem |
On-Site Speaker (Planned) |
Xiangmei Ding |
Abstract Scope |
The size distribution and morphology of graphite nodules are critical for the mechanical properties of ductile cast iron (DCI). High-speed synchrotron radiography is used to understand the nucleation, buoyancy and growth kinetics of graphite nodules during solidification in DCI. Statistical analysis indicates that the size distribution, morphology and velocity of nodules vary significantly during solidification. Initially, the majority of nodules formed tend to move in the melt with little growth. Their movement trajectories in the melt are captured and the growth kinetics are discussed. These fast-moving spherical nodules first form at the bottom of the melt and then their velocity decreases or they become static after the appearance of dendrites. A significant increase in nodule growth rate is then observed. The various morphologies of nodules observed will be discussed, such as the formation of graphite protrusions, flower-ball shapes and the growth of associated austenite shell will be discussed in detail. |
Proceedings Inclusion? |
Planned: |
Keywords |
Iron and Steel, Characterization, Solidification |