|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Frontiers in Solidification Science and Engineering
||Inoculation in Lab Scale Low Alloyed Steel Castings
||Marvin Gennesson, Dominique Daloz, Julien Zollinger, Bernard Rouat, Hervť Combeau, JoŽlle Demurger, Delphine Poirier
|On-Site Speaker (Planned)
Macrosegregation is a critical defect in industrial steel ingots. Reducing the grain size is a possible way to decrease macrosegregation by minimizing the relative motion between grains and the liquid phase. Currently, grain refinement in steels is achieved via electromagnetic stirring or inoculation. Inoculation aims to create a stable distribution of particles in the liquid phase to promote heterogeneous nucleation. Experiments using different inoculant powders (oxides, nitrides, carbides and ferrocerium) were carried out on two different steel grades in a 50g induction heated laboratory furnace. The inoculants were selected based on lattice mismatch, thermodynamic stability and relative density. The effects of each inoculant type on the microstructure are discussed in terms of these selection parameters. The addition of materials with a low lattice mismatch tended to refine the grain size, except in the case of ferrocerrium additions. Electron microprobe and SEM characterization improve understanding of the underlying mechanisms.
||Planned: Supplemental Proceedings volume