Effect of Mg Addition on the Evolution of Inclusions in Al–Ca Deoxidized Melts

Zhang, Tongsheng; Min, Yi; Liu, Chengjun; Jiang, Maofa

doi:10.2355/isijinternational.isijint-2014-691

Cited by 47 publications

(28 citation statements)

References 52 publications

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“…Kimura et al 14) reported that MgO-Al 2 O 3 complex inclusion had a much weaker tendency to aggregate and form clusters than Al 2 O 3 inclusion by the in-situ observation with a confocal scanning laser microscope. Zhang et al 15) studied the effect of magnesium addition on the evolution of inclusion in Al-Ca deoxidized melts, and found that the size of oxide inclusion could be controlled well with a certain amount of magnesium addition. Similar results were also reported by Zhang et al 16) in Mn-Si-Al deoxidized molten steel.…”

Section: Introductionmentioning

confidence: 99%

Formation and Evolution of Silicate Inclusions in Molten Steel by Magnesium Treatment

Zhang¹,

Min²,

Xu³

et al. 2019

ISIJ International

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Section: Introductionmentioning

confidence: 99%

Formation and Evolution of Silicate Inclusions in Molten Steel by Magnesium Treatment

Zhang¹,

Min²,

Xu³

et al. 2019

ISIJ International

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“…Although the amount of B-type inclusion in Si-deoxidised stainless steel is very low, it is enough to cause various defects of the product. Calcium treatment can effectively modify the solid inclusions into the liquid ones in steelworks, which is advantageous for the mechanical properties of final steel production [4][5][6][7]. Owing to the importance of inclusions, scholars have conducted many researches on the inclusion control in stainless steel, such as size distribution, thermodynamic calculation, formation mechanism, reaction kinetics and dynamic evolution of the nonmetallic inclusions [8][9][10][11][12][13][14][15][16], mostly for Al-deoxidised stainless steel at steelmaking temperature.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics and transient behavior of the inclusion in Si deoxidized stainless steel for high-grade plate

Wang

Xue

Zhang

et al. 2019

Metall. Res. Technol.

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The experiments were carried out to determine the transient behavior of the inclusion in Si-deoxidized stainless steel for high-grade plate. The samples were taken from three heats of the steel during the whole production process from the AOD to the mold, which were subsequently examined by an automatic scanning electron microscope with field energy dispersive spectrometer (FE-SEM&EDS). It can be summarized that appropriate calcium treatment intensity could modify inclusions into liquid ones. Excessive calcium treatment above ([Ca] = 25 ppm) will increase the melting point of the inclusions, which cannot keep in the liquid region at the solidification temperature. Therefore, the calcium addition in Si-deoxidized stainless steels should be controlled to a relatively lower value ([Ca] = 10 ppm). In addition, the content of aluminum in steel also has an important influence on the control of inclusion. When the content of aluminum ([Al] = 0.012%) is too high, the inclusions in steel are difficult to be controlled within the liquid phase. The chemical evolution of the inclusions in steel at high temperature and during solidification process were comprehensively calculated, considering all types of inclusions such as calcium oxide, aluminum oxide, silicon oxide, calcium aluminate, calcium silicate, mullite, and liquid inclusion. The thermodynamic calculations are in good agreement with experimental results, which can predict the formation of the inclusions in Si-deoxidized stainless steels.

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“…Yang and Wang studied the inclusion evolution after calcium addition in low carbon Al‐killed steels with ultra‐low sulfur content and estimated the contents of CaO, Al 2 O 3 , and CaS through the total contents of Ca, S, and O in molten steel. Zhang et al discussed the inclusion evolution under Al–Ca combined deoxidation. Ono et al and Wu et al studied inclusion generation under Al–Ti–Mg deoxidation.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on the Impact of Deoxidation Methods on the Fatigue Properties of Bearing Steels

Bao

Gan

et al. 2018

steel research int.

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Strong deoxidation and weak deoxidation are two kinds of deoxidation methods frequently applied in steelmaking. In the present study, high‐carbon chromium bearing steels are smelted with a strong deoxidizer and a weak deoxidizer, respectively in industrial trials. The generation mechanism of inclusions is analyzed, and the inclusion stability diagrams of the Fe–Si–Al–Mg–Mn–O system at 1873 and 1843 K are calculated. The very high cycle fatigue life of bearing steels deoxidized with different deoxidizers is also experimentally compared. The results showed that the evolution routes of inclusion in high‐carbon chromium bearing steels deoxidized by Si and Al are CaO–Al2O3–SiO2 → CaO–Al2O3–SiO2–MgO and Al2O3 → CaO–Al2O3–SiO2–MgO, respectively. The Al content in steel is controlled by different methods when different deoxidizers are applied. The effect of the oxide inclusions generated during Si deoxidization on the fatigue life is lower than that during Al deoxidization, even if the total oxygen content is slightly higher. This effect suggests that it is not accurate to evaluate the fatigue life of steels with the total oxygen content, and it is also desirable to produce bearing steels with the Si deoxidation method.

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Effect of Mg Addition on the Evolution of Inclusions in Al–Ca Deoxidized Melts

Cited by 47 publications

References 52 publications

Formation and Evolution of Silicate Inclusions in Molten Steel by Magnesium Treatment

Formation and Evolution of Silicate Inclusions in Molten Steel by Magnesium Treatment

Thermodynamics and transient behavior of the inclusion in Si deoxidized stainless steel for high-grade plate

An Experimental Study on the Impact of Deoxidation Methods on the Fatigue Properties of Bearing Steels

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