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

Publikationen: Beitrag in FachzeitschriftArtikelForschung(peer-reviewed)

Autoren

  • Gerald Nitzl
  • Yong Tang
  • Gernot Hackl
  • Josef Watzinger
  • Christian M.G. Rodrigues

Externe Organisationseinheiten

  • RHI Magnesita, Wien
  • Christian Doppler Labor für Magnetohydrodynamische Anwendungen in der Metallurgie, Leoben
  • Primetals Technologies Austria GmbH

Abstract

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.

Details

OriginalspracheEnglisch
Seiten (von - bis)88-102
Seitenumfang15
FachzeitschriftJournal of iron and steel research international
Jahrgang29.2022
Ausgabenummer1
DOIs
StatusVeröffentlicht - 23 Mär 2022