|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Frontiers in Solidification: An MPMD Symposium in Honor of Michel Rappaz
||Microstructure Evolution in Containerless Solidification
||Jonas Valloton, Abdoul-Aziz Bogno, Dieter M Herlach, Hani Henein
|On-Site Speaker (Planned)
For decades, Bridgman solidification has been used to generate benchmark data for numerical simulations. However, these experiments cannot achieve solidification rates high enough to compare with the solidification structures of rapid casting processes where high cooling rates and undercoolings induce vast deviation from equilibrium. To overcome these limitations containerless solidification techniques have recently established themselves as the techniques of choice. In this work, containerless rapid solidification of Al-alloys and D2 steel is investigated experimentally using Impulse Atomization (IA) and ElectroMagnetic Levitation (EML). Powders of size ranging from 100 to 1400 μm corresponding to a wide range of cooling rates and undercoolings have been generated by IA and droplets of ~6-7 mm in diameter have been rapidly solidified by EML. The effect of undercooling and cooling rate on the solidification path and final microstructure is investigated. IA and EML techniques are found to be complementary in fully characterizing rapid solidification microstructures.