The influence of convection on the microstructure evolution during solidification
主 题: The influence of convection on the microstructure evolution during solidification
报告人: Prof. Ricardo Siquieri (RWTH Aachen)
时 间: 2008-11-25 下午 4:00 - 5:00
地 点: 理科一号楼 1303
Numerical simulation of solidification and crystal growth has attracted
industrial attention as a powerful engineering tool for processes and alloy
optimization. In this work we present a detailed study of the influence of
flow on the microstructure evolution during solidification.
First, we use a classical sharp interface approach combined with an accurate fluid flow solver to simulate dendritic growth under the influence of an imposed flow. Secondly, we include convection effects into an existing quantitative phase-field model [Phys. Rev. E, 70 (2004) 061604] that is meant to simulate dendritic growth of a binary alloy. We apply it to investigate the solidification of a Fe-Mn alloy under external flows conditions. In addition, we present an extension of the quantitative phase-field model of two-phase growth [Phys. Rev. E, (2005) 72 011602] that includes natural and forced convection effects in the melt phase. We use this extension to investigate directional solidification of eutectic lamellae under the influence of convection as well as heterogeneous nucleation and microstructure formation of peritectic growth in the presence of convection.
