|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Phase Transformation, Microstructural Evolution and Property Modification in Rapidly Solidified Grey Cast Iron
||Olamilekan Oloyede, Robert F. Cochrane, Andrew M. Mullis
|On-Site Speaker (Planned)
The phase transformation and microhardness changes of hypoeutectic grey iron subjected to rapid solidification cooled in N<SUB>2</SUB> were studied to showcase the relationship between structure and microhardness of this important engineering material. Droplets samples were prepared, using containerless processing via drop-tube technique. These rapidly cooled samples were collected and sieved into 9 size ranges from ≥ 850 µm to ≤ 53 µm diameters with corresponding estimated cooling rate of ≈ 200 – 23,000 K s <SUP>–1</SUP>. The emerged phases and evolved morphologies were characterized using optical and scanning electron microscopy, X-ray diffraction analysis and transmission electron microscopy; while Vickers microhardness tester was used to measure the hardness in the various samples. As the cooling rate increases, the undercooling increased and Martensitic or acicular ferrite structure was observed in the very small droplets which confirms the progressive increase in microhardness of the samples from the as-cast to decreasing droplets sizes.
||Planned: Supplemental Proceedings volume