TY - JOUR

T1 - Norton-Hoff model for deformation of growing solid shell of thin slab casting in funnel-shape mold

AU - Vakhrushev, Alexander

AU - Kharicha, Abdellah

AU - Wu, Menghuai

AU - Ludwig, Andreas

AU - Nitzl, Gerald

AU - Tang, Yong

AU - Hackl, Gernot

AU - Watzinger, Josef

AU - Rodrigues, Christian M.G.

N1 - Publisher Copyright: © 2022, The Author(s).

PY - 2022/3/23

Y1 - 2022/3/23

N2 - 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.

AB - 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.

KW - Continuous casting

KW - Improved both side diffusion method

KW - Norton-Hoff model

KW - OpenFOAM

KW - Solid shell

KW - Solidification

KW - Thin slab

KW - Viscoplastic stress

UR - http://www.scopus.com/inward/record.url?scp=85124769064&partnerID=8YFLogxK

U2 - 10.1007/s42243-021-00734-8

DO - 10.1007/s42243-021-00734-8

M3 - Article

AN - SCOPUS:85124769064

VL - 29.2022

SP - 88

EP - 102

JO - Journal of iron and steel research international

JF - Journal of iron and steel research international

SN - 1006-706X

IS - 1

ER -