Norton-Hoff model for deformation of growing solid shell of thin slab casting in funnel-shape mold  

作　　者：Alexander Vakhrushev Abdellah Kharicha Menghuai Wu Andreas Ludwig Gerald Nitzl Yong Tang Gernot Hackl Josef Watzinger Christian M.G.Rodrigues 

机构地区：[1]Christian-Doppler Laboratory for Metallurgical Applications of Magnetohydrodynamics,Montanuniversitat Leoben,8700 Leoben,Austria [2]Primetals Technologies,4031 Linz,Austria [3]Chair of Simulation and Modeling of Metallurgical Processes,Department of Metallurgy,Montanuniversit?t Leoben,8700 Leoben,Austria [4]RHI Magnesita GmbH,1120 Vienna,Austria [5]RHI Magnesita GmbH,8700 Leoben,Austria

出　　处：《Journal of Iron and Steel Research International》2022年第1期88-102,共15页

基　　金：the financial support by the Austrian Federal Ministry of Economy,Family and Youth and the National Foundation for Research,Technology and Development within the framework of the Christian Doppler Laboratory for Metallurgical Applications of Magnetohydrodynamics.

摘　　要：A funnel-type mold is commonly used to provide necessary clearance for the submerged entry nozzle in the thin slab casting(TSC).The partially solidified shell is subjected to the mechanical deformations,which can lead to the defects formation and,as a results,to a breakout.Traditionally,the results of the flow simulation,performed by the finite volume method(FVM),are fed to the external package for the finite element analysis of stress and strain.A coupled model was assembled using“creeping solid”approach by blending the Norton-Hoff viscoplastic stress for the solidifying shell with the Newtonian viscous stress of the liquid melt.The FVM was used to combine both liquid and solid stress models within a single solver.The iterative procedure based on the improved both side diffusion method was introduced to treat the nonlinear relation between the viscoplastic stress and the strain rate.The modeled shell thickness was verified by previously published breakout measurements and the simulation results.Temperature distribution,obtained during the TSC simulation,dominantly corresponds to the viscoplastic range.Developed numerical approach is robust and has direct industrial application.

关 键 词：Solid shell Viscoplastic stress Solidification Norton-Hoff model Thin slab Continuous casting Improved both side diffusion method OPENFOAM 

分 类 号：TG24[金属学及工艺—铸造]