Effect of a sudden level fluctuation on hook formation during continuous casting of ultra-low carbon steel slabs

Joydeep Sengupta, Brian G. Thomas

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Initial solidification in the meniscus region during continuous casting of steel slabs forms periodic surface depressions called oscillation marks, which are often accompanied by subsurface microstructural features called "hooks". To understand their formation mechanism, a transient finite-element model, CON2D has been applied to compute temperature, stress, and distortion of a steel shell during the initial stages of solidification of ultra-low carbon steel. Furthermore, the effects of sudden metal level fluctuations are investigated. The model uses a creep-type elastic-viscoplastic constitutive equation for steel, which is integrated using a two-level algorithm alternating between solutions at the local node point and the global system of equations. Results show that thermal stress causes the exposed portion of the thin shell to bend away from the mold as the liquid level suddenly drops. The subsequent rise in liquid level increases the bending. The maximum distortion of the shell was found to be ∼0.46 mm for a large level drop of 16 mm for 0.4 s. If the deformed shell tip develops enough strength to resist being pushed back to the mold, it will remain embedded in the solidified steel as a hook after the meniscus overflows the deformed shell tip. Further solidification in the overflowed region then creates an oscillation mark.

Original languageEnglish (US)
Title of host publicationModeling of Casting, Welding and Advanced Solidification Processes - XI
Pages727-736
Number of pages10
StatePublished - 2006
Externally publishedYes
EventModeling of Casting, Welding and Advanced Solidification Processes - XI - Opio, France
Duration: May 28 2006Jun 2 2006

Publication series

NameModeling of Casting, Welding and Advanced Solidification Processes - XI
Volume2

Other

OtherModeling of Casting, Welding and Advanced Solidification Processes - XI
Country/TerritoryFrance
CityOpio
Period5/28/066/2/06

Keywords

  • Continuous casting
  • Hook
  • Hook formation mechanism
  • Meniscus
  • Mold oscillation
  • Negative strip
  • Oscillation marks
  • Ultra-low carbon steel

ASJC Scopus subject areas

  • General Engineering

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