박주현
2019-04-16T02:16:58Z
2019-04-16T02:16:58Z
2015-12
ISIJ INTERNATIONAL, v. 55, No. 12, Page. 2589-2596
0915-1559
1347-5460
https://www.jstage.jst.go.jp/article/isijinternational/55/12/55_ISIJINT-2015-125/_article/-char/ja/
https://repository.hanyang.ac.kr/handle/20.500.11754/102049
Effect of Ce addition on the interfacial reaction between alumina refractory and 25wt%Cr-20wt%Ni-4wt%Si-0.5wt%Mn stainless steel deoxidized by Al at 1 873 K was investigated to understand the contribution of the refractory-steel reaction to the inclusion evolution processes. The oxygen content markedly decreased by Al deoxidation, followed by a sluggish decrease by Ce addition greater than 0.5 wt%. The Ce content continuously decreased, but the higher the initial Ce content, the lower the Ce-decreasing rate was obtained. The content of Al initially decreased due to the formation of Al-rich inclusions, followed by an abrupt increase mainly due to a reduction of alumina refractory by Ce at the steel-refractory interface. The content of Al decreased again because of the formation of CeAlO3 compound not only as inclusions but also as refractory-steel reaction products. The CeAl11O18 and CeAlO3 were formed at the refractory side, while the Ce2O3 and CeAlO3 were formed at the steel side in the 0.5 wt% and 1.0 wt% Ce added systems. From the refractory-steel reaction mechanism, the process of inclusion evolution was proposed to three steps as follows. The initial SiO2-rich oxides are reduced by Al, resulting in the formation of aluminosilicates inclusions (Step 1). The Al2O3 in the inclusions are reduced by cerium, resulting in the formation of Ce-rich oxides (Step 2). Because the Ce content continuously decreased due to the refractory-steel reaction, the inclusions transform from Ce-Al complex oxides to Al-rich aluminosilicates and from Ce2O3 to Ce-Al complex oxides in the 0.1 wt% and 0.5 wt% Ce added systems (Step 3).
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (Grant number NRF-2012R1A1A2041774). The authors are grateful to Dr. Hidekazu TODOROKI, Nippon Yakin Kogyo, Japan, for his fruitful discussion in regard of the refractory-steel interfacial reaction mechanism.
en_US
IRON STEEL INST JAPAN KEIDANREN KAIKAN
cerium
refractory-steel interfacial reaction
25Cr-20Ni-4Si-0.5Mn stainless steel
deoxidation
inclusion
Al2O3
Ce2O3
CeAlO3
CeAl11O18
MISCH-METAL
IRON-ALLOYS
CERIUM
DEOXIDATION
SOLIDIFICATION
THERMODYNAMICS
EQUILIBRIA
RESISTANCE
CORROSION
SPINEL
Influence of Refractory-Steel Interfacial Reaction on the Formation Behavior of Inclusions in Ce-containing Stainless Steel
Article
12
55
10.2355/isijinternational.ISIJINT-2015-125
2589-2596
ISIJ INTERNATIONAL
Kwon, Sun Kuk
Park, Jun Seok
Park, Joo Hyun
2015002488
E
COLLEGE OF ENGINEERING SCIENCES[E]
DEPARTMENT OF MATERIALS SCIENCE AND CHEMICAL ENGINEERING
basicity