Free Deformation of Initial Solid Shell of Fe-C Alloys

Shu Xin Dong, Eisuke Niyama, Koichi Anzai

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

The deformation of initial solid shell has important effects on the formation of surface defects of continuously cast slabs of steel. In order to understand the thermal deformation behavior of initial solid shell of steel, droplets of Fe-C alloys and commercial steels were solidified on a chill plate and the bottom shape of solid shell was measured. The solid shell always deforms during solidification and cooling to give a spherical bottom shape. This deformation of solid shell shows a very strong dependence on carbon content. When carbon content is lower than about 0.6mass% or higher than 2.5mass%, solid shells show positive deformation, i.e. convex towards the chill. When carbon content lays between 0.6-2.5 mass%, solid shells show negative deformation, i.e. concave towards the chill. Two peaks of positive deformation were found as carbon contents come neartoOmass% (pure iron) or 0.12mass%. These two peaks of positive deformation of solid shell correspond to the reported peaks of frequencies of surface defect occurrence such as longitudinal cracks and deep oscillation mark of continuously cast steel slabs. The deformation of pure iron solid shell was accurately predicted with a deformation model of initial solid shell previously derived by the authors. An explanation for the maximum deformation at 0.12 mass% carbon conent was also made by the model using a numerical heat transfer calculation with a coupling of deformation and solid shell-chill interface heat transfer coefficient.

Original languageEnglish
Pages (from-to)730-736
Number of pages7
JournalIsij International
Volume35
Issue number6
DOIs
Publication statusPublished - 1995
Externally publishedYes

Keywords

  • Fe-C alloy
  • continuous casting
  • cracks
  • deformation
  • depression marks
  • initial solidification
  • interface heat transfer coefficient
  • oscillation marks
  • steel
  • surface defects

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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