The Experts below are selected from a list of 2169 Experts worldwide ranked by ideXlab platform
Lifeng Zhang - One of the best experts on this subject based on the ideXlab platform.
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effect of cerium on the wettability between 304 stainless steel and mgo al2o3 based Lining Refractory
Ceramics International, 2020Co-Authors: Lifeng Zhang, Ying Ren, Limei Cheng, Ji ZhangAbstract:Abstract In the current study, the wettability between three types of Al2O3–MgO refractories and the 304 stainless steel with and without cerium was investigated using a sessile drop method under a reducing atmosphere at 1580 °C. The contact angle between the stainless steel without cerium and Al2O3, MgO·Al2O3, MgO refractories was 133.3°, 135.7°, 119.0°, respectively, while it was 121.6°, 137.4°, 115.2° for the stainless steel with cerium, respectively. The solid oxide layer on the surface of drops prevented the molten droplet from spreading and increased the contact angle. The reaction between the steel drop and the Refractory at the interface lowered the contact angle. For the Al2O3 Refractory, the added cerium in the stainless steel reacted with the Refractory and formed a Ce–Al–O interaction layer, resulting in a lower contact angle. The reduction of MgO Refractory by hydrogen gas led to the formation of solid Mg–Si–O products on the droplet surface, resulting in an increase of the contact angle. The cerium in the molten steel generated cerium oxides, lowered the formation of Mg–Si–O products, and decreased the contact angle between the magnesia Refractory and the steel. The reduction of the Lining Refractory by hydrogen gas led to the formation of a few MgO·Al2O3 particles on the Ce-free droplet, which slightly increased the contact angle. The cerium generated solid Ce–Al–O products on the lower surface of the droplet and at the steel/Refractory interface, leading to a slight increase of the contact angle.
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effect of snorkel shape on the fluid flow during rh degassing process mathematical modelling
Ironmaking & Steelmaking, 2018Co-Authors: Haitao Ling, Lifeng Zhang, C LiuAbstract:A mathematical model was developed to investigate the effect of snorkel shape on the recirculation rate and the erosion of the Lining Refractory during RH degassing process. A particle image velocimetry technique was used to measure the velocity distribution in a water modelling experiment. The calculated results were well validated with the measured ones. In the mathematical model, the interfaces between the molten steel and the gas phase, and the motion of argon bubbles were simulated and tracked using VOF + DPM model by which the argon bubbles were treated as the discrete phase in the molten steel and the top gas phase, and the top gas phase was treated as a second continuous phase. It was found that the recirculation rate of the molten steel with oval snorkels was significantly larger than that with round snorkels. For round snorkels, the optimum gas flow rate was 1800 L min−1 and it was 2800 L min−1 for oval snorkels. Furthermore, the volume distribution of the argon in the radial direction of the up...
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kinetic modeling for the dissolution of mgo Lining Refractory in al killed steels
Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science, 2017Co-Authors: Fuxiang Huang, Lifeng Zhang, Ying Zhang, Ying RenAbstract:A kinetic model for the dissolution of the magnesia Refractory in Al-killed steels was developed to predict the change of chemical compositions in the molten steel. Coupled reaction model and empirical equations were employed to calculate reactions between the Refractory and the molten steel. The calculated result showed good agreement with the experimental value from the literature. The relationship between the mass transfer coefficient and the stirring energy dissipation in the molten steel was obtained as $$ k = \left( {5.6 - 4.7 \times e^{{ - 96.6\dot{\varepsilon }}} } \right) \times 10^{ - 4} $$ m/s. The formation of spinels is dependent on the chemical composition of the molten steel. The MgO Refractory may react with Al and O in the liquid steel. Meanwhile, the decomposing of the MgO Refractory also plays an important role in the dissolution of the magnesia Refractory in Al-killed steels.
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wettability between liquid iron and tundish Lining Refractory
Revue De Metallurgie-cahiers D Informations Techniques, 2016Co-Authors: Ping Shen, Lifeng Zhang, Yi WangAbstract:In the current study, the wettability between liquid iron and Lining Refractory of a continuous casting tundish was investigated. In the sample preparation process, liquid phase was generated during sintering, and CaMgSiO4 and Mg2 SiO4 were precipitated during cooling. The phase transition from solid state to liquid state during the measurement of contact angle lead to the increase of surface roughness. The increase of surface roughness contributed to the increase of contact angle in a short interval. A bigger contact angle would be achieved on a rougher surface. The contact angle between liquid iron and Refractory substrates with relatively rough surface was approximately 112.6° at 1550 °C and 107.7° at 1626 °C. When the pure iron melted and covered the surface of substrate, open pores on the surface were not filled by the liquid iron. At the three-phase contact line in the pore, there existed a local contact angle. The average value of the local contact angle was 113.3°, which was close to the measured macro-contact angle. In the second phase rich area, liquid iron penetrated into substrate through pores, the average penetration depth was approximately 140 μ m.
Ji Zhang - One of the best experts on this subject based on the ideXlab platform.
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effect of cerium on the wettability between 304 stainless steel and mgo al2o3 based Lining Refractory
Ceramics International, 2020Co-Authors: Lifeng Zhang, Ying Ren, Limei Cheng, Ji ZhangAbstract:Abstract In the current study, the wettability between three types of Al2O3–MgO refractories and the 304 stainless steel with and without cerium was investigated using a sessile drop method under a reducing atmosphere at 1580 °C. The contact angle between the stainless steel without cerium and Al2O3, MgO·Al2O3, MgO refractories was 133.3°, 135.7°, 119.0°, respectively, while it was 121.6°, 137.4°, 115.2° for the stainless steel with cerium, respectively. The solid oxide layer on the surface of drops prevented the molten droplet from spreading and increased the contact angle. The reaction between the steel drop and the Refractory at the interface lowered the contact angle. For the Al2O3 Refractory, the added cerium in the stainless steel reacted with the Refractory and formed a Ce–Al–O interaction layer, resulting in a lower contact angle. The reduction of MgO Refractory by hydrogen gas led to the formation of solid Mg–Si–O products on the droplet surface, resulting in an increase of the contact angle. The cerium in the molten steel generated cerium oxides, lowered the formation of Mg–Si–O products, and decreased the contact angle between the magnesia Refractory and the steel. The reduction of the Lining Refractory by hydrogen gas led to the formation of a few MgO·Al2O3 particles on the Ce-free droplet, which slightly increased the contact angle. The cerium generated solid Ce–Al–O products on the lower surface of the droplet and at the steel/Refractory interface, leading to a slight increase of the contact angle.
Ying Ren - One of the best experts on this subject based on the ideXlab platform.
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effect of cerium on the wettability between 304 stainless steel and mgo al2o3 based Lining Refractory
Ceramics International, 2020Co-Authors: Lifeng Zhang, Ying Ren, Limei Cheng, Ji ZhangAbstract:Abstract In the current study, the wettability between three types of Al2O3–MgO refractories and the 304 stainless steel with and without cerium was investigated using a sessile drop method under a reducing atmosphere at 1580 °C. The contact angle between the stainless steel without cerium and Al2O3, MgO·Al2O3, MgO refractories was 133.3°, 135.7°, 119.0°, respectively, while it was 121.6°, 137.4°, 115.2° for the stainless steel with cerium, respectively. The solid oxide layer on the surface of drops prevented the molten droplet from spreading and increased the contact angle. The reaction between the steel drop and the Refractory at the interface lowered the contact angle. For the Al2O3 Refractory, the added cerium in the stainless steel reacted with the Refractory and formed a Ce–Al–O interaction layer, resulting in a lower contact angle. The reduction of MgO Refractory by hydrogen gas led to the formation of solid Mg–Si–O products on the droplet surface, resulting in an increase of the contact angle. The cerium in the molten steel generated cerium oxides, lowered the formation of Mg–Si–O products, and decreased the contact angle between the magnesia Refractory and the steel. The reduction of the Lining Refractory by hydrogen gas led to the formation of a few MgO·Al2O3 particles on the Ce-free droplet, which slightly increased the contact angle. The cerium generated solid Ce–Al–O products on the lower surface of the droplet and at the steel/Refractory interface, leading to a slight increase of the contact angle.
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kinetic modeling for the dissolution of mgo Lining Refractory in al killed steels
Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science, 2017Co-Authors: Fuxiang Huang, Lifeng Zhang, Ying Zhang, Ying RenAbstract:A kinetic model for the dissolution of the magnesia Refractory in Al-killed steels was developed to predict the change of chemical compositions in the molten steel. Coupled reaction model and empirical equations were employed to calculate reactions between the Refractory and the molten steel. The calculated result showed good agreement with the experimental value from the literature. The relationship between the mass transfer coefficient and the stirring energy dissipation in the molten steel was obtained as $$ k = \left( {5.6 - 4.7 \times e^{{ - 96.6\dot{\varepsilon }}} } \right) \times 10^{ - 4} $$ m/s. The formation of spinels is dependent on the chemical composition of the molten steel. The MgO Refractory may react with Al and O in the liquid steel. Meanwhile, the decomposing of the MgO Refractory also plays an important role in the dissolution of the magnesia Refractory in Al-killed steels.
Limei Cheng - One of the best experts on this subject based on the ideXlab platform.
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effect of cerium on the wettability between 304 stainless steel and mgo al2o3 based Lining Refractory
Ceramics International, 2020Co-Authors: Lifeng Zhang, Ying Ren, Limei Cheng, Ji ZhangAbstract:Abstract In the current study, the wettability between three types of Al2O3–MgO refractories and the 304 stainless steel with and without cerium was investigated using a sessile drop method under a reducing atmosphere at 1580 °C. The contact angle between the stainless steel without cerium and Al2O3, MgO·Al2O3, MgO refractories was 133.3°, 135.7°, 119.0°, respectively, while it was 121.6°, 137.4°, 115.2° for the stainless steel with cerium, respectively. The solid oxide layer on the surface of drops prevented the molten droplet from spreading and increased the contact angle. The reaction between the steel drop and the Refractory at the interface lowered the contact angle. For the Al2O3 Refractory, the added cerium in the stainless steel reacted with the Refractory and formed a Ce–Al–O interaction layer, resulting in a lower contact angle. The reduction of MgO Refractory by hydrogen gas led to the formation of solid Mg–Si–O products on the droplet surface, resulting in an increase of the contact angle. The cerium in the molten steel generated cerium oxides, lowered the formation of Mg–Si–O products, and decreased the contact angle between the magnesia Refractory and the steel. The reduction of the Lining Refractory by hydrogen gas led to the formation of a few MgO·Al2O3 particles on the Ce-free droplet, which slightly increased the contact angle. The cerium generated solid Ce–Al–O products on the lower surface of the droplet and at the steel/Refractory interface, leading to a slight increase of the contact angle.
Fuxiang Huang - One of the best experts on this subject based on the ideXlab platform.
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kinetic modeling for the dissolution of mgo Lining Refractory in al killed steels
Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science, 2017Co-Authors: Fuxiang Huang, Lifeng Zhang, Ying Zhang, Ying RenAbstract:A kinetic model for the dissolution of the magnesia Refractory in Al-killed steels was developed to predict the change of chemical compositions in the molten steel. Coupled reaction model and empirical equations were employed to calculate reactions between the Refractory and the molten steel. The calculated result showed good agreement with the experimental value from the literature. The relationship between the mass transfer coefficient and the stirring energy dissipation in the molten steel was obtained as $$ k = \left( {5.6 - 4.7 \times e^{{ - 96.6\dot{\varepsilon }}} } \right) \times 10^{ - 4} $$ m/s. The formation of spinels is dependent on the chemical composition of the molten steel. The MgO Refractory may react with Al and O in the liquid steel. Meanwhile, the decomposing of the MgO Refractory also plays an important role in the dissolution of the magnesia Refractory in Al-killed steels.