A Brief introduction of the Speaker
Professor Menghuai Wu obtained his master's degree from Northwestern Polytechnical University in 1986 and his Ph.D. in Engineering from RWTH Aachen University, Germany, in 2000. In 2010, he became the head of the Numerical Simulation Laboratory for Advanced Solidification and Melting Processes at the University of Leoben, Austria. His primary research focuses on numerical simulation and modeling of solidification and related metallurgical processes. He has published over 400 academic papers in top-tier international journals such as Acta Materialia, Computational Materials Science, and Metallurgical and Materials Transactions A & B, with an H-index of 38. He has led and coordinated numerous national, EU, and international research projects and has established extensive and in-depth collaborations with the steel industry, including companies like Primetals, INTECO (Voestalpine), and RHIMagnesita. The multiphase solidification models he developed have been widely applied in continuous casting, semi-continuous casting, ingot casting, and ESR/VAR processes. In recognition of his outstanding contributions to the field of numerical simulation, the Styrian government in Austria awarded him the prestigious "Grundlagenforschung - Basic Research" Annual Honorary Award in 2010 (an award granted once a year to a single recipient).
Abstract
Solidification and remelting occur concurrently during solidification of many engineering castings. The current contribution is to address the flow-effect on the remelting of settling/floating crystals during the mixed columnar-equiaxed solidification. The modelling results show that remelting rate of the floating/settling crystals, which originate from fragmentation and then brought to the superheated region by the forced flow, is significantly enhanced by the flow. In turnthe released latent heat can reduce the temperature locally (even globally), hence to speed up the solidification of the columnar structure. Additionally, the solidification-migration-remelting of equiaxed grains present an important macrosegregation mechanism. By solidification of a erystalin the cold region it rejects solute, while by remelting of the crystal it dilutes the surrounding melt.These phenomena are found critical in many engineering castings with mixed columnar-equiaxed solidification.
