Simulation of macrosegregation in a large vertical continuous casting of steel

International Symposium on Liquid Metal Processing & Casting 2015

材料科学;金属工艺学

Zheng, Y.^1 ; Wu, M.^1,2 ; Kharicha, A.^1,2 ; Ludwig, A.^1

Department of Modeling and Simulation of Metallurgical Processes, Montanuniversitaet Leoben, Austria^1

Christian Doppler Lab for Advanced Simulation of Solidification and Melting, Montanuniversitaet Leoben, Austria^2

关键词: Columnar to equiaxed transition;    Continuous casting of steels;    Crystal sedimentation;    Equiaxed solidification;    Formation mechanism;    Negative segregations;    Segregation patterns;    Solutal convections;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/143/1/012032/pdf
DOI  :  10.1088/1757-899X/143/1/012032

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

A three-phase mixed columnar-equiaxed solidification model considering fluid flow, heat and solute transport is applied to simulate the solidification in a vertical continuous casting. The key features of solidification phenomena in this process, such as evolution of columnar phase, evolution and floatation/sedimentation of equi- axed crystals, thermal solutal convection of the melt and the flow caused by crystal sedimentation, development of as-cast structure, the columnar-to-equiaxed transition (CET), and formation of macrosegregation, are simulated. It is predicted that there is an equiaxed zone in the central part of the strand, and the rest section is filled with columnar phase (or dominant with columnar phase). A relatively strong negative segregation in the equiaxed zone and a mostly neutral concentration in the columnar region are found. Near the CET, there is a so-called middle radius positive segregation band. Formation mechanisms of this segregation pattern are discussed.