Thermal-mechanical behaviour during initial solidification in continuous casting: Steel grade effects

J. Sengupta, C. Ojeda, B. G. Thomas

Research output: Contribution to journalArticlepeer-review

Abstract

A transient finite-element model (CON2D) is applied to compute temperature, stress, and distortion of the steel shell during initial solidification. The model incorporates temperature- dependent properties, thermal shrinkage, phase transformations, and different elastic-viscoplastic constitutive equations for each phase (liquid, δ,and γ). The effects of sudden metal level fluctuations are simulated for different steel grades. Increasing the depth of a level drop increases distortion of the shell tip, curving it further away from the mould wall. This curvature is largest for ultra-low-carbon (ULC) and peritectic steels, and decreases for low- and high-carbon steels. This matches the well- known plant observations of the variation of oscillation mark depth with steel grade. The results suggest that the shape of the lower side of oscillation marks is governed by thermal distortion, which is greatly aggravated by level fluctuations.

Original languageEnglish (US)
Pages (from-to)8-14
Number of pages7
JournalInternational Journal of Cast Metals Research
Volume22
Issue number1-4
DOIs
StatePublished - Nov 4 2009

Keywords

  • Continuous casting
  • Hooks
  • Meniscus
  • Oscillation marks
  • Peritectic
  • Steel grade

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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