Effect of Al content on the reaction between Fe-10Mn-xAl (x = 0.035wt%, 0.5wt%, 1wt%, and 2wt%) steel and CaO-SiO2-Al2O3-MgO slag

In this study, the viscometer was used to evaluate the viscosity of slag containing 10%SiO2 with varying CaO/Al2O3 ratios. When CaO/Al2O3 ratio increased in the 3.00 to 4.00 range, the viscosity exhibited a non‐monotonic behavior characterized by an initial decrease followed by an increase, with a minimum value of 0.046 Pa·s observed at 1673 K. The slag with a CaO/Al2O3 ratio above 3.00 had relatively low and stable viscosity within the range of 1373 K to 1673 K, which was beneficial for slab quality of high‐aluminum steel. X‐ray diffraction and Raman spectroscopy were used to better understand the viscosity evolution of slag containing 10%SiO2. A higher CaO/Al2O3 ratio depolymerized network structures due to the breaking effect of free oxygen O2‐. Upon surpassing a CaO/Al2O3 ratio of 3.50, the transformation of the crystallization phase occurs from CaO·SiO2 to 2CaO·SiO2. Additionally, a higher CaO/Al2O3 ratio promoted the precipitation of the 11CaO·7Al2O3·CaF2 crystal in the slag.This article is protected by copyright. All rights reserved.

Section: Introductionmentioning

confidence: 99%

Effect of High Mass Ratio of CaO to Al₂O₃ on Properties of Slag Containing 10% SiO₂

Mo,

Li,

et al. 2023

“…[11] Currently, a considerable amount of literature has been published on the influence of Al in Fe-Mn-Al-C steels on the characteristics of nonmetallic inclusions and the mechanical properties of steels. [7,[12][13][14][15][16][17] Surveys such as that conducted by Alba [12] (2021) have shown that when the Al content increased from 0.5% to 6%, the total amount of inclusions in the steel increased by 2.5 times, and mainly the number of AlN inclusions increased. In addition, AlN(pure) inclusions were observed in the steel with 6% Al.…”

mentioning

confidence: 99%

“…Furthermore, it is observed that an increase of twofold in AlON inclusions relative to the Al content as the Al percentage increased from 3% to 6%. Yu et al [17] found that as the initial content of Al increased from 0.035 to 2 wt%, the type of inclusions evolved and the average size of inclusions presented a trend that increased first and then decreased.However, few researchers have been able to draw on any systematic research into the Mn content in the Fe-Mn-Al-C…”

mentioning

confidence: 99%

“…[14,[18][19][20][21] So far, very little attention has been paid to how Mn content affects inclusions formation and growth in Fe-Mn-Al-C steels, especially under high aluminum content. Park et al [14] studied the formation of inclusions in Fe- (10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) Mn-(1-6)Al steels and found that the Mn content increased from 10% to 20%, Al 2 O 3 , MnAl 2 O 4 , oxide core with MnS, and MnS with AlON inclusions increased. Gigacher et al [18] reported that the main inclusions in (15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)Mn-3Al-3Si steel were AlN, MnS, Al 2 O 3 -MnO-AlN, and Al 2 O 3 -MnO-MnS, while they did not study the effect of Mn content on inclusions in the steel in depth.…”

mentioning

confidence: 99%

“…Park et al [14] studied the formation of inclusions in Fe- (10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) Mn-(1-6)Al steels and found that the Mn content increased from 10% to 20%, Al 2 O 3 , MnAl 2 O 4 , oxide core with MnS, and MnS with AlON inclusions increased. Gigacher et al [18] reported that the main inclusions in (15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)Mn-3Al-3Si steel were AlN, MnS, Al 2 O 3 -MnO-AlN, and Al 2 O 3 -MnO-MnS, while they did not study the effect of Mn content on inclusions in the steel in depth. Michaelia et al [19] studied inclusion formation in Fe-Mn-Al steels using an automated scanning electron microscope (SEM).…”

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confidence: 99%

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Effect of Manganese on the Formation Mechanism of Nonmetallic Inclusions in Fe–xMn–7Al–0.7C Lightweight Steel

Liu

Xue

Song

2022

Herein, the effect of Mn content on the formation of noninclusions in lightweight steels is investigated. In addition, the precipitation behavior of MnS inclusions during solidification under different manganese contents (3%, 10%, 20%, and 30%) is analyzed with help of a microsegregation model. The results show that the inclusions formed are classified into seven types: Al2O3, Al2O3–MnS, AlN, MnS, AlN–MnS, Al2O3–AlN, and Al2O3–AlN(AlON)–MnS in the steel. As the Mn content increases from 3% to 30%, the total area ratio and total number density of inclusions increase, especially AlN‐containing inclusions and MnS‐containing inclusions. The thermodynamic results of inclusion types calculated with FactSage are consistent with the observed results. When the Mn content ranges from 3% to 30%, both Al2O3 and AlN inclusions can exist stably at the steelmaking temperature, and MnS inclusions can precipitate in the mushy zone alone. With the enhancement of Mn content, the precipitation temperature of MnS inclusions decreases, and the solid fraction decreases during solidification. Moreover, it is found that Mn content can significantly affect the morphology of the precipitated MnS, and an increase in Mn content can promote the divorced eutectic transformation of MnS to form polyhedral MnS.

The Effect of Alloying Elements on Formation and Evolution Mechanism of Manganese‐Containing Inclusions in Medium/High‐Manganese Steels

Liu,

Chu,

Liu

et al. 2023

The present work assesses the effect of alloying element of Mn, Al, C, and Si on formation and evolution behaviour of manganese‐containing inclusions in medium/high‐manganese steel. The results indicate that the manganese‐containing inclusions after Al addition were gradually transformed from MnO‐MnS into MnS, MnS‐Al2O3 and MnS‐Al2O3‐AlN‐TiN with large size of about 10 μm. Besides, as the Mn content increases, the main manganese‐containing inclusions are polyhedral MnS‐Al2O3 and MnS‐AlN with sharp edge, and the proportion of AlN and TiN in complex inclusions increases. Additionally, the increase of Mn content significantly reduces liquid phase temperature and extension of the solid‐liquid two phase zone, promoting the divorced eutectic transformation of type II to type III of MnS, lead to the polyhedral MnS preferentially precipitation at early stage of solidification process. Furthermore, it also observed that the main manganese‐containing inclusions were irregular MnS and MnS‐AlN with edge and larger sizes of 10–50μm in the case of manganese steel grades with high C or Si content, which is attributed to divorced eutectic transformation and increase of activity of S and Mn. Moreover, the C element possesses most obvious promoting effect on the precipitation of MnS, followed by Si and Mn elements.