Kinetic study of the devitrification of mold powder slags

Yadira G. Maldonado, F. Andrés Acosta, A. Humberto Castillejos, Brian G. Thomas

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

Abstract

Due to the rapid cooling of the slag infiltrated into the mold-strand gap, it is expected that the rate of devitrification of the glass formed plays a key role in determining the proportion of crystalline phases influencing mold heat transfer. In this investigation, a novel procedure to calculate Time-Temperature-Transformation (TTT) curves of mold slags is presented. It is based on the integration under isothermal conditions of a Kissinger-type rate equation using rate parameters determined from differential thermal analysis (DTA). The estimated TTT curves agree very well with transformations observed metallographically by inspecting glass disks, 3 mm thick, quenched after isothermal treatment. In the latter tests a transverse face of a glass disk, insulated laterally, was seated onto an inductively heated metallic plate subjected to prescribed thermal cycles. Both procedures were found suitable for evaluating and comparing the rate of devitrification exhibited by different mold fluxes.

Original languageEnglish (US)
Title of host publicationAISTech 2012 - Proceedings of the Iron and Steel Technology Conference and Exposition
Pages1279-1289
Number of pages11
StatePublished - Sep 17 2012
EventAISTech 2012 Iron and Steel Technology Conference and Exposition - Atlanta, GA, United States
Duration: May 7 2012May 10 2012

Publication series

NameAISTech - Iron and Steel Technology Conference Proceedings
ISSN (Print)1551-6997

Other

OtherAISTech 2012 Iron and Steel Technology Conference and Exposition
CountryUnited States
CityAtlanta, GA
Period5/7/125/10/12

Keywords

  • Continuous Casting
  • DTA
  • Devitrification
  • Kissinger type rate equation
  • Mold powders
  • TTT diagrams

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering

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