Equilibrium Relationship between the Oxide Compounds in MgO–Al2O3–Ti2O3 and Molten Iron at 1 873 K

Ono, Hideki; Nakajima, Keiji; Ibuta, Toshio; Usui, Tateo

doi:10.2355/isijinternational.50.1955

Cited by 20 publications

(11 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In our previous work, 6) we reported the equilibrium relationships between the oxide compounds in MgO-Al2O3-Ti2O3 and molten iron at 1 873 K. The formation of MgTi2O4 was confirmed as one of the equilibrium phases. However, there are insufficient thermodynamic data available on the formation of MgTi2O4.…”

Section: Introductionmentioning

confidence: 83%

See 1 more Smart Citation

Equilibrium Relationships between Oxide Compounds in MgO–Ti2O3–Al2O3 with Iron at 1873 K and Variations in Stable Oxides with Temperature

Ono

Ibuta

2011

ISIJ Int.

Self Cite

View full text Add to dashboard Cite

It is important to determine the equilibrium relationships between the oxide compounds in MgO-Ti2O3-Al2O3 and iron to avoid Al2O3 or MgO·Al2O3 formation and for inclusion control. In this study, the equilibrium relationships between the oxide compounds in MgO-Ti2O3-Al2O3 and molten iron are investigated at 1 873 K. The phase-stability diagrams, which show the equilibrium relationships between the oxide compounds in MgO-Ti2O3-Al2O3 and molten iron, are described. It is also important to know the oxides that newly form after solidification. Accordingly, the temperature-dependences of the stable compounds that newly form after solidification were investigated using the thermodynamic calculation software FactSage 6.1. Although the compounds formed after solidification are not necessarily the same as the equilibrium oxide compounds at 1 873 K, the correlation between them can be confirmed. In particular, under the unstable condition of MgAl2O4 at 1 873 K, it is found that the formation of MgAl2O4 could also be suppressed after solidification.

show abstract

Section: Introductionmentioning

confidence: 83%

“…10 together with our previous experimental results. 6) The numerical values near the open and closed circles show the oxygen content [mass ppm O]. The calculated iso-oxygen curves are also shown in Fig.…”

Section: Equilibrium Relationships Between the Oxidementioning

confidence: 98%

Equilibrium Relationships between Oxide Compounds in MgO–Ti2O3–Al2O3 with Iron at 1873 K and Variations in Stable Oxides with Temperature

Ono

Ibuta

2011

ISIJ Int.

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, more work should be performed to measure the exact value of e Ti Mg due to the huge difference between e Ti Mg ¼ À47:4 [42] and e Ti Mg ¼ À18:4 [37] by Ono et al and e Ti Mg ¼ À 0:64 [61] by Jo et al The formation reaction of Al 2 O 3 in the molten iron is expressed by Eq. [5].…”

Section: B Thermodynamic Calculation Of Mg-al-ti-o Complex Inclusionsmentioning

confidence: 99%

“…Therefore, the activity of the oxide products is assumed to unity. By plugging the thermodynamic data and T = 1873 K (1600°C) and fixing the content of oxygen as different value, the relationship between [i] and [j] can be [42] e j i (fij) T i A l M g O Ti 0.048 [57] 0.0037 [58] À91.6 [41] À1.026 [59] Al 0.004 [58] 0.038 [60] À0.13 [57] À1.867 [60] Mg À47.4 [41] À0.12 [57] À0.047 [60] À0.602 [60] O À0.34 [59] À1.105 [60] À0.396 [60] À0.175 [60] c determined from the equilibrium equations. Then, the equilibrium curves of the stable phases in the molten steel at 1873 K (1600°C) can be drawn in phase diagram, which are under different oxygen contents.…”

Section: B Thermodynamic Calculation Of Mg-al-ti-o Complex Inclusionsmentioning

confidence: 99%

Formation and Thermodynamics of Mg-Al-Ti-O Complex Inclusions in Mg-Al-Ti-Deoxidized Steel

Ren

Zhang

Yang

et al. 2014

Metall Mater Trans B

View full text Add to dashboard Cite

The formation of Mg-Al-Ti-O complex inclusions in steel was investigated by laboratory experiments and thermodynamic calculation. The composition evolutions of Mg-Al-Ti-O inclusions in steel with different contents of [Al], [Mg], and [Ti] were discussed. Mg-Al-Ti-O complex inclusion with high TiO x content was liquid at 1873 K (1600°C), indicating MgAl 2 O 4 spinel inclusions can be modified to low melting temperature ones by combining TiO x component. The stability diagram of Al-Mg-Ti-O system inclusions in the molten steel at 1873 K (1600°C) was calculated, considering many kinds of oxide inclusions such as , and liquid inclusion. The thermodynamic calculations are in good agreement with experimental results, which can predict the formation of Al-Mg-Ti-O complex inclusions in molten steel with a large concentration range of [Al], [Mg], and [Ti].

show abstract

“…Modifications of spinel inclusions by a Ti addition and calcium treatment in liquid steel during the refining process were studied by several researchers. [19][20][21][22][23][24][25][26] The formation condition of MgTi2O4 instead of MgAl 2 O 4 was studied by Ono et al 25,26) However, the Ti will accelerate the Mg dissolution from the refractory and slag which will lead to an easier formation of spinel inclusions. 20) Yang et al 22) pointed out that spinel inclusions would transform to liquid complex inclusions, if the dissolved Ca content in the liquid steel exceeds 1 ppm.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Different Inclusions during Ladle Treatment and Continuous Casting of Stainless Steel

Karasev

Jönsson

2013

ISIJ Int.

View full text Add to dashboard Cite

The inclusions and clusters in steel samples of two similar steel grades of high-silicon non-calcium treated (HSiNC) stainless steels were investigated and compared during ladle treatment and continuous casting. Samples of liquid steel and slag were taken at different stages of the ladle treatment and casting during two plant trials: Low Al steel (LAl) and High Al steel (HAl). After electrolytic extraction of the steel samples, characteristics of inclusions and clusters (such as morphology, composition, size and number) were investigated in three dimensions (3D) by SEM in combination with EDS. Moreover, the composition of typical inclusions and clusters was analyzed on a polished cross section of steel samples. Spherical (SP), irregular and regular (IR) inclusions and clusters (CL) were observed in the samples from both heats. It was found that the morphology and composition of inclusions and clusters in both heats were significantly changed during the ladle treatment and casting. Most of inclusions (44-98%) in a Low Al steel are MgO-CaO-SiO2-Al2O3 spherical inclusions. The compositions of IR inclusions and clusters in steel samples of a High Al steel were mostly MgO·Al2O3 spinel, but also the complex SP inclusions containing Al2O3-MgO-CaO-SiO2. In addition, phase stability diagram based on Darken's quadratic formalism and Redlich-Kister type polynomial was estimated for both heats at a non-infinite solution.

show abstract

Equilibrium Relationship between the Oxide Compounds in MgO–Al2O3–Ti2O3 and Molten Iron at 1 873 K

Cited by 20 publications

References 9 publications

Equilibrium Relationships between Oxide Compounds in MgO–Ti2O3–Al2O3 with Iron at 1873 K and Variations in Stable Oxides with Temperature

Equilibrium Relationships between Oxide Compounds in MgO–Ti2O3–Al2O3 with Iron at 1873 K and Variations in Stable Oxides with Temperature

Formation and Thermodynamics of Mg-Al-Ti-O Complex Inclusions in Mg-Al-Ti-Deoxidized Steel

Evolution of Different Inclusions during Ladle Treatment and Continuous Casting of Stainless Steel

Contact Info

Product

Resources

About