2014 Volume 54 Issue 6 Pages 1294-1303
A numerical model was further developed and applied in this work to understand and optimize the carbide redistribution during centrifugal casting process used in manufacturing of high speed steel (HSS) shell rolls. This model will help to further understand the complex solidification behavior of the HSS roll. Performance of the HSS roll requires proper formation and distribution of the VC, (V, Mo)C, and Mo2C carbides as well as the eutectic carbides, which is shown by dimensional analysis to be dominated by centrifugal buoyancy effects and solidification and carbide kinetics. The model includes a rheology-viscosity sub-model to address the interference between different moving particles or classes of particles of different sizes. The carbide redistribution model was successfully validated against experimental work. A parametric study was performed to determine the key variables that influence the distribution of the VC, (V, Mo)C, and Mo2C carbides and refine the HSS microstructure including the wash (coating) material, superheat, C content of the shell material and mold temperature.
