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Influence of Refractory-Steel Interfacial Reaction on the Formation Behavior of Inclusions in Ce-containing Stainless Steel

Title
Influence of Refractory-Steel Interfacial Reaction on the Formation Behavior of Inclusions in Ce-containing Stainless Steel
Author
박주현
Keywords
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
Issue Date
2015-12
Publisher
IRON STEEL INST JAPAN KEIDANREN KAIKAN
Citation
ISIJ INTERNATIONAL, v. 55, No. 12, Page. 2589-2596
Abstract
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).
URI
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
ISSN
0915-1559; 1347-5460
DOI
10.2355/isijinternational.ISIJINT-2015-125
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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