TY - JOUR
T1 - A new mechanism of hook formation during continuous casting of ultra-low-carbon steel slabs
AU - Sengupta, Joydeep
AU - Thomas, Brian G.
AU - Shin, Ho Jung
AU - Lee, Go Gi
AU - Kim, Seon Hyo
N1 - Funding Information:
The authors thank the Natural Sciences and Engineering Research Council of Canada, the National Science Foundation (Grant No. DMI-05-28668), and the Continuous Casting Consortium, the University of Illinois at Urbana–Champaign, for support of this project. The technical support extended by POSCO personnel, J.M. Park, C.H. Lee, W.Y. Choi, and J.H. Park, is gratefully acknowledged.
PY - 2006/5
Y1 - 2006/5
N2 - The initial stages of solidification near the meniscus during continuous casting of steel slabs involve many complex inter-related transient phenomena, which cause periodic oscillation marks (OMs), subsurface hooks, and related surface defects. This article presents a detailed mechanism for the formation of curved hooks and their associated OMs, based on a careful analysis of numerous specially etched samples from ultra-low-carbon steel slabs combined with previous measurements, observations, and theoretical modeling results. It is demonstrated that hooks form by solidification and dendritic growth at the liquid meniscus during the negative strip time. Oscillation marks form when molten steel overflows over the curved hook and solidifies by nucleation of undercooled liquid. The mechanism has been justified by its explanation of several plant observations, including the variability of hook and OM characteristics under different casting conditions, and the relationships with mold powder consumption and negative/positive strip times.
AB - The initial stages of solidification near the meniscus during continuous casting of steel slabs involve many complex inter-related transient phenomena, which cause periodic oscillation marks (OMs), subsurface hooks, and related surface defects. This article presents a detailed mechanism for the formation of curved hooks and their associated OMs, based on a careful analysis of numerous specially etched samples from ultra-low-carbon steel slabs combined with previous measurements, observations, and theoretical modeling results. It is demonstrated that hooks form by solidification and dendritic growth at the liquid meniscus during the negative strip time. Oscillation marks form when molten steel overflows over the curved hook and solidifies by nucleation of undercooled liquid. The mechanism has been justified by its explanation of several plant observations, including the variability of hook and OM characteristics under different casting conditions, and the relationships with mold powder consumption and negative/positive strip times.
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U2 - 10.1007/s11661-006-0103-1
DO - 10.1007/s11661-006-0103-1
M3 - Article
AN - SCOPUS:33646537519
SN - 1073-5623
VL - 37
SP - 1597
EP - 1611
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 5
ER -