Effect of Al deoxidation on the formation behavior of inclusions in Ce-added stainless steel melts

Kwon, Sun Kuk; Kong, Young‐Min; Park, Joo Hyun

doi:10.1007/s12540-014-5022-x

Cited by 35 publications

(21 citation statements)

References 18 publications

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“…Then, the initial (blank) steel sample was taken using a quartz tube (OD : 6 mm) connected to a syringe and rapidly quenched by dipping into brine. A fixed amount (0.05 wt%) of high purity (4N) aluminum shot, which had been determined as an appropriate pre-deoxidation before Ce addition in our previous study, 22) was added in the melt through the quartz tube under inert atmosphere. For addition of Ce into the molten steel, the 82wt%Ni-18wt%Ce alloy, which was preliminarily prepared using a vacuum arc melter, was added in order to provide 0.1, 0.5, and 1.0 wt% Ce as an initial content.…”

Section: Methodsmentioning

confidence: 99%

“…21) Recently, we investigated the effect of Al deoxidation on the inclusion evolution process in Ce-containing ASS melts. 22 In summary, the total oxygen and Ce contents in Ce added stainless molten steel is strongly dependent not only on the composition of inclusions but also on the deoxidation conditions. That is, the higher the content of Ce 2 O 3 in inclusions, the greater the density of inclusions, which results in the higher total oxygen content.…”

Section: Introductionmentioning

confidence: 95%

“…slag-steelinclusion-refractory systems using this package has been successful in various kinds of applications. 14,[22][23][24][25][26][29][30][31][32][33][34] The 'FToxid' and 'FTmisc' databases were selected for estimating the oxide and molten steel phases. The computed results are shown in Fig.…”

Section: Interfacial Reaction Mechanism Between Moltenmentioning

confidence: 99%

“…22) Alternatively, the Al-rich aluminosilicates, which had been formed by Al deoxidation, were fully (80 to 100%) modified to Ce 2 O 3 in the 0.5 wt% and 1.0 wt% Ce added systems (Figs. 13(b) and 13(c)).…”

Section: Effect Of Steel-refractory Reaction On the Inclusion Evolutimentioning

confidence: 99%

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

Kwon

Park

2015

ISIJ Int.

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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 CeAlO 3 compound not only as inclusions but also as refractory-steel reaction products. The CeAl 11 O 18 and CeAlO 3 were formed at the refractory side, while the Ce 2 O 3 and CeAlO 3 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 SiO 2 -rich oxides are reduced by Al, resulting in the formation of aluminosilicates inclusions (Step 1). The Al 2 O 3 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 Ce 2 O 3 to Ce-Al complex oxides in the 0.1 wt% and 0.5 wt% Ce added systems (Step 3).

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Section: Interfacial Reaction Mechanism Between Moltenmentioning

confidence: 99%

Section: Effect Of Steel-refractory Reaction On the Inclusion Evolutimentioning

confidence: 99%

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

Kwon

Park

2015

ISIJ Int.

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“…The effect of Al addition on the toughness of steels has been the subject of controversy. For example, Al has been generally regarded as harmful impurity elements for toughness due to the formation of AlN and Al 2 O 3 particles, which can act as crack initiation [18][19][20]. It has been reported that as Al content increases, the transition threshold falls and the steel with traces of Al has an extremely low impact value.…”

Section: Effect Of Al Additionmentioning

confidence: 99%

Improvement of low temperature toughness of ferritic Mn steels by alloy modification

Kwon

et al. 2015

Met. Mater. Int.

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A study has been made on the effects of Mn content and addition of Al on the microstructure and mechanical properties of (4-6)Mn steels, with the aim of developing ferritic Mn steels having good combination of tensile properties and impact toughness. It has been shown that the reduction of Mn content to 6 wt% and lower from 8-12 wt% of conventional steels can effectively prevent the occurrence of intergranular fracture, which has been a major problem of (8-12)Mn steels with poor toughness at cryogenic temperature. While increasing Mn content in the binary (4-6)Mn steels results in an increase in strength and a decrease in impact toughness, the addition of 1Al to (4-6)Mn steels results in improvements in both strength and impact toughness as compared to those of the binary (4-6)Mn steels and the best impact toughness has been obtained in the as-rolled 1Al added 4Mn steel, whose microstructure consists of fine acicular ferrite grains.

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Understanding Sulfide Capacity of Molten Aluminosilicates Via Structural Information from ‘Raman’ and ‘NMR’ Spectroscopic Methodologies

PARK

2016

Advances in Molten Slags, Fluxes, and Salts

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Effect of Al deoxidation on the formation behavior of inclusions in Ce-added stainless steel melts

Cited by 35 publications

References 18 publications

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

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

Improvement of low temperature toughness of ferritic Mn steels by alloy modification

Understanding Sulfide Capacity of Molten Aluminosilicates Via Structural Information from ‘Raman’ and ‘NMR’ Spectroscopic Methodologies

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