|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Defects and Properties of Cast Metals
||In-situ Observation of Spheroidal Graphite Formation and Measurement of Apparent Volume Expansion in Ductile Cast Iron
||Hideyuki Yasuda, Akira Sugiyama, Kohei Morishita, Tomoya Nagira, Masato Yoshiya, Kentaro Uesugi, Akihisa Takeuch
|On-Site Speaker (Planned)
In-situ and time-resolved observation of ductile cast iron solidification with 3.6-3.7mass%C and 0.002-0.04mass%Mg) was performed using synchrotron radiation X-ray. Addition of Mg reduced the temperature range that graphite particles grew as a primary phase and promoted spheroidal graphite formation. However, some of the graphite particles tended to deviate from spheroidal shape and the coupled eutectic of austenite and graphite occurred in Al2O3 crucible. On the other hand, the spheroidal shape remained until the end of solidification and the coupled eutectic did not occur in MgO crucible. SEM observation showed that the crucibles modified types of inclusions in the melt. The types significantly influenced nucleation and growth of graphite. The result provides new insights for controlling microstructure of ductile cast iron. In this presentation, we would present in-situ measurement of stress induced during solidification due to the spheroidal graphite growth and discuss shrinkage defects in the cast iron.
||Planned: Supplemental Proceedings volume