TY - GEN
T1 - Kinetic study of the devitrification of mold powder slags
AU - Maldonado, Yadira G.
AU - Acosta, F. Andrés
AU - Castillejos, A. Humberto
AU - Thomas, Brian G.
PY - 2012/9/17
Y1 - 2012/9/17
N2 - 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.
AB - 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.
KW - Continuous Casting
KW - DTA
KW - Devitrification
KW - Kissinger type rate equation
KW - Mold powders
KW - TTT diagrams
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M3 - Conference contribution
AN - SCOPUS:84866091606
SN - 9781935117247
T3 - AISTech - Iron and Steel Technology Conference Proceedings
SP - 1279
EP - 1289
BT - AISTech 2012 - Proceedings of the Iron and Steel Technology Conference and Exposition
T2 - AISTech 2012 Iron and Steel Technology Conference and Exposition
Y2 - 7 May 2012 through 10 May 2012
ER -