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ULTRASONIC SEPARATION OF MICRO-SIZED INCLUSIONS IN molten metal

Acta metallurgica Sinica(English Letters) 2001年第5期14卷 375-379页

作者： X.Q. Bai and J.C. He Key Laboratory of National Education Ministry for Electromagnetic Processing of Materials, Northeastern University, Shenyang 110004, China Northeastern Univ. Shenyang 110004 China

The coagulation time and position of micro-sized non-metallic inclusions in molten metal during ultrasonic separation process were investigated, and the motion course of micro-sized non-metallic inclusions in an ultrasonic standing wave field was numerically simulated. The results of theoretical analysis and numerical simulation show that the movement of inclusions depends on the balance between the acoustic radiation force, effective buoyancy force and viscous drag force. It is presented that micro-sized inclusions, agglomerated at antinode-planes may be removed further with horizon tal ultrasound.``

关键词： ultrasound molten metal micro-sized non-metallic inclusion numerical simulation process parameter

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Thermodynamic Model for Calculating Activity of Nitrogen and Boron in Fe-C-B-N molten metal

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Journal of Iron and Steel Research(International) 2009年第3期16卷 15-19页

作者： WANG Shi-jun PENG Jun DONG Yuan-chi LIU Li-xia ZHOU Yun CHEN Er-bao School of metallurgy and Resource Anhui University of Technology Maranshan 243002 Anhui China School ofmetallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China

The solubility of nitrogen in Fe-C-B-N system was measured at 1 758 K,and the computational model on activity （action concentration） of nitrogen and boron was established based on phase diagram and the coexistence theory about metal melt structure model. Comparing the computed results with the experimental results,satisfactory conclusion can be obtained. The result shows that BN and B4C can exist in Fe-C-B-N molten metal at high temperature,which consequently restrains the nitrogen removal from the melt. However,B4C content is extremely low. Before graphite is precipitated,the influence of carbon on activity of nitrogen in melt is higher in ternary system than in binary system; however,this effect is contrary to that after graphite is precipitated.

关键词： molten metal coexistence theory action concentration activity

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Analysis of molten metal Distribution in the Mold of a Horizontal Centrifugal Casting

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Open Journal of Applied Sciences 2020年第7期10卷 444-454页

作者： Miguel A. Barron Dulce Y. Medina Joan Reyes Departamento de Materiales Universidad Autonoma Metropolitana Azcapotzalco Mexico City Mexico

It is numerically studied the influence of the angular velocity, the molten metal viscosity, and the mold wall roughness on the molten metal distribution in the mold of a horizontal centrifugal casting process. The undesirable raining phenomenon sometimes arises in horizontal centrifugal casting. It occurs when the molten metal rains or falls from the top of the mold to the bottom while the mold is rotating. Using Computational Fluid Dynamics simulations, the conditions for the emergence of the raining phenomenon were explored in this work. For the system considered, angular velocities less than 77 rad/s cause the emergence of the raining phenomenon and accumulation of the molten metal in the lower part of the mold, whereas angular velocities greater than 77 rad/s produce a constant thickness of the molten metal and prevent raining.

关键词： Angular Velocity Centrifugal Casting Computational Fluid Dynamics molten metal Viscosity Wall Roughness

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Effect of electromagnetic force on melt induced by traveling magnetic field

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Transactions of Nonferrous metals Society of China 2010年第4期20卷 662-667页

作者：苏彦庆徐严谨赵雷郭景杰傅恒志 School of Materials Science and Engineering Harbin Institute of Technology

A new apparatus was designed to measure the electromagnetic force and a computational study of the traveling magnetic field(TMF)and its application to the Ga-In-Sn melt(with low melting point),then the forces on Al,Mg,and Li melt,were simulated. The result show that the electromagnetic force on the melt increases linearly with the increasing length of the melt in the *** TMF-induced Lorentz force increases with increasing frequency,and then *** maximum value is obtained when the current frequency is 160 Hz,over that frequency the force decreases *** the iron-core is activated,the force increases when the melt closes to the *** Lorentz forces have inversely-proportional relationships with the electrical resistivity,the dfx/dρdecreases and the dfy/dρincreases with the increasing electrical resistivity(df/dρis the slope of the Lorentz force profile).

关键词： electromagnetic force traveling magnetic field Ga-In-Sn melt molten metal

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