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

Ono, Hideki; Ibuta, Toshio

doi:10.2355/isijinternational.51.2012

Cited by 14 publications

(4 citation statements)

References 9 publications

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“…The systematic studies of Mg deoxidation in Fe 10 mass% Ni have been carried out by Suito et al It was found that complex deoxidation of the Ti followed by strong deoxidant Mg is one of the most promising methods to precisely control the composition, size, and number of deoxidation particles. The thermodynamic calculations of the stability diagram Mg‐Al‐Ti‐O system has also been done by Hono et al and Ren et al…”

Section: Introductionmentioning

confidence: 97%

Improvement of HAZ Toughness of Steel Plate for High Heat Input Welding by Inclusion Control with Mg Deoxidation

Yang

Zhu

et al. 2015

steel research int.

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The effect of Mg content on the evolution behavior of inclusions in the steel plates with Mg deoxidation was investigated based on the experimental studies and thermodynamic calculations. Simulating welding process and Charpy impact test were also carried out to evaluate the Heat Affected Zone (HAZ) toughness of steel plates. The typical inclusions found in the steels were the complex inclusions comprising central oxide and peripheral MnS. With the increase of Mg content in the steel samples from 0 to 27, 38 and 99 ppm, the phase of central oxide inclusions changed sequentially from Al 2 O 3 to (Mg-Ti-O), and MgO, which is consistent with the thermodynamic calculation results. Furthermore, the size of inclusions decreases and the number density of inclusions increases with the increase of Mg content. The HAZ toughness of steel plates after welding with heat input of 400 kJ cm À1 has been greatly improved by inclusion control with Mg deoxidation.

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Section: Introductionmentioning

confidence: 97%

Improvement of HAZ Toughness of Steel Plate for High Heat Input Welding by Inclusion Control with Mg Deoxidation

Yang

Zhu

et al. 2015

steel research int.

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show abstract

“…[1][2][3][4][5] Inclusions adversely affect the toughness, fatigability and ductility of steel because of their high melting points, high hardness, and brittleness. 1) Oxides inclusions in steel serve as effective sites for the initiation of hydrogen induced cracking (HIC). 2,3) Larger and elongated inclusions such as manganese sulfide (MnS) have a remarkable influence on ductile fractures.…”

Section: Introductionmentioning

confidence: 99%

Effect of Al Content on the Characteristics of Inclusions in Al–Ti Complex Deoxidized Steel with Calcium Treatment

Zheng

et al. 2014

ISIJ Int.

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To improve the effect of calcium treatment and the cleanliness of steel and to make use of fine TiOx to refine the microstructure of steel, the effect of aluminum content on inclusion characteristics of aluminum-titanium complex deoxidized and calcium treated steel is investigated based on the experiment with SEM/EDS, Image Pro-Plus 6.0 and FactSage 6.1 softwares and thermodynamic calculation in the present work. The results show that the inclusions in two steels with different aluminum content are obviously spherical composite inclusions with a two-layer complex structure, consisting of an Al2O3-CaO-TiOX core surrounded by MnS. In low aluminum steel, the oxide core of inclusions contains much TiOx and CaO, and their composite structure is mosaic compared with bundle in high aluminum steel, the number of inclusions is 2.5 times more than that in high aluminum steel, the thickness of MnS on oxides surface is also thinner. In addition, melting point of the inclusions in low aluminum steel is lower, the cleanliness of the steel is relatively improved because of the inclusions floating up, and the deformation aspect ratio of calcium aluminate inclusions with a certain amount of Ti2O3 is effectively improved, which is about 1-2 while the composition of oxide core is xAl 2 O 3 = 35-55%, xTi 2 O 3 = 15-35%, and xCaO = 10-25%. As a result, less calcium is needed to modify the alumina inclusions to liquid calcium aluminate in the case of lower aluminum deoxidized steel, thus the calcium treatment effect can be improved. The low aluminum in steel is more effective to control the inclusion characteristics to reduce the harm of MnS and to improve the cleanliness of steel.

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“…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%

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

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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].

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

Cited by 14 publications

References 9 publications

Improvement of HAZ Toughness of Steel Plate for High Heat Input Welding by Inclusion Control with Mg Deoxidation

Improvement of HAZ Toughness of Steel Plate for High Heat Input Welding by Inclusion Control with Mg Deoxidation

Effect of Al Content on the Characteristics of Inclusions in Al–Ti Complex Deoxidized Steel with Calcium Treatment

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

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