TY - JOUR
T1 - Engulfment Behavior of Inclusions in High-Carbon Steel
T2 - Theoretical and Experimental Investigation
AU - Tanaka, Yasuhiro
AU - Pahlevani, Farshid
AU - Privat, Karen
AU - Moon, Suk Chun
AU - Dippenaar, Rian
AU - Kitamura, Shin ya
AU - Sahajwalla, Veena
N1 - Funding Information:
This research was financially supported under Australian Research Council?s Industrial Transformation Research Hub funding scheme (Project IH130200025). Y.T. would like to thank Nippon Steel & Sumitomo Metal Corporation, Japan for the scholarship support provided for his Ph.D. study in the UNSW, Sydney. This research used the facilities supported by AMMRF at the Electron Microscope Unit at the UNSW. The authors declare no competing interests. Manuscript submitted March 12, 2018.
Publisher Copyright:
© 2018, The Minerals, Metals & Materials Society and ASM International.
PY - 2018/12/1
Y1 - 2018/12/1
N2 - Previous studies on inclusions behavior at the front of the solidifying steel shell have mainly focused on low-carbon steels. However, with the increasing applications of high-carbon steel in recent years because of its superior properties, it is crucial to understand this behavior in high-carbon steel. Most of the high-carbon steels are deoxidized by silicon, calcium treated, and contain higher sulfur percentage. Also, higher carbon content has a determining influence on the viscosity and surface tension, which will affect the inclusion behavior. In this study, we have investigated the engulfment behaviors of inclusions in front of the solidifying interface in high-carbon steels using concentric solidification method. The critical velocity of the growing shell, at which the particle is engulfed in the solidifying shell, instead of being pushed by this shell, was determined. The inclusion identified in this study is a bi-component form of CaO-SiO2-based oxide and CaS. It was revealed that engulfment behavior is strongly affected by convection of liquid steel that originates from carbon push out in high-carbon steels. This study provides new crucial information to produce high-carbon steel with fewer inclusions, which opens new application pathways for this emerging grade of steel.
AB - Previous studies on inclusions behavior at the front of the solidifying steel shell have mainly focused on low-carbon steels. However, with the increasing applications of high-carbon steel in recent years because of its superior properties, it is crucial to understand this behavior in high-carbon steel. Most of the high-carbon steels are deoxidized by silicon, calcium treated, and contain higher sulfur percentage. Also, higher carbon content has a determining influence on the viscosity and surface tension, which will affect the inclusion behavior. In this study, we have investigated the engulfment behaviors of inclusions in front of the solidifying interface in high-carbon steels using concentric solidification method. The critical velocity of the growing shell, at which the particle is engulfed in the solidifying shell, instead of being pushed by this shell, was determined. The inclusion identified in this study is a bi-component form of CaO-SiO2-based oxide and CaS. It was revealed that engulfment behavior is strongly affected by convection of liquid steel that originates from carbon push out in high-carbon steels. This study provides new crucial information to produce high-carbon steel with fewer inclusions, which opens new application pathways for this emerging grade of steel.
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U2 - 10.1007/s11663-018-1394-5
DO - 10.1007/s11663-018-1394-5
M3 - Article
AN - SCOPUS:85052568913
SN - 1073-5615
VL - 49
SP - 2986
EP - 2997
JO - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
JF - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
IS - 6
ER -