Research on the Coupling between Electromagnetic Pressure and Temperature Field in Dual-Frequency Electromagnetic Shaping Process

In this study, the distribution of electromagnetic pressure and the coupling between shaping force and temperature field are investigated in electromagnetic contactless shaping process for plates of stainless steel and superalloy. The distributions of electromagnetic pressure on outlines of melt cross sections are very different along sides than at corners. Under the vacuum, the cooling ability is not strong enough, and therefore the position of melt in inductor is too low, which causes an unbalance between electromagnetic pressure and static pressure. Experiments show the insert of a screen shell from the bottom of inductor can change the distribution of magnetic field very much and make a good and stable coupling between shaping force and temperature field.

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The Electromagnetic Confinement and Shaping Process of Liquid Metal

Materials Science Forum ◽

10.4028/www.scientific.net/msf.475-479.281 ◽

2005 ◽

Vol 475-479 ◽

pp. 281-284 ◽

Cited By ~ 3

Author(s):

Changjiang Song ◽

Zhen Ming Xu ◽

Jian Guo Li

Keyword(s):

Magnetic Field ◽

Stainless Steel ◽

Temperature Field ◽

Melting Point ◽

Liquid Metal ◽

Electromagnetic Force ◽

Alternating Magnetic Field ◽

Gravity Force ◽

Effect Factors ◽

Shaping Process

The Electromagnetic Confinement and Shaping (EMCS) process is a crucibleless melting and mouldless shaping technology by alternating magnetic field. In this paper, stability of the shaping, effect factors of the electromagnetic force and the temperature field and the procedure of the EMCS process are systemically analyzed. The Results indicate that a good coupling of the temperature field and the electromagnetic force is important to stably shape for liquid metal, and the gravity force of liquid metal is more sensitive to change of the temperature (or the current through the inductor) than the electromagnetic force does above the melting point of the sample. Several stainless steel samples were obtained by EMCS process.

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Research on the dual-frequency electromagnetic shaping of liquid metal

Journal of Materials Processing Technology ◽

10.1016/s0924-0136(02)01078-6 ◽

2003 ◽

Vol 137 (1-3) ◽

pp. 204-207 ◽

Cited By ~ 2

Author(s):

Shuangming Li ◽

Jinshan Li ◽

Qitang Hao ◽

Hongchao Kou ◽

Jianguo Li ◽

...

Keyword(s):

Liquid Metal ◽

Dual Frequency ◽

Electromagnetic Shaping

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Numerical Simulation of Temperature Field and Stress Field of Direct Laser Metal Deposition Shaping Process of Titanium Alloys

Journal of Mechanical Engineering ◽

10.3901/jme.2011.24.074 ◽

2011 ◽

Vol 47 (24) ◽

pp. 74 ◽

Cited By ~ 1

Author(s):

Yuan KONG

Keyword(s):

Numerical Simulation ◽

Temperature Field ◽

Stress Field ◽

Titanium Alloys ◽

Metal Deposition ◽

Laser Metal Deposition ◽

Shaping Process ◽

Direct Laser ◽

Direct Laser Metal Deposition

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Characteristics and Application of Temperature-Field Emitters

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100114347 ◽

1975 ◽

Vol 33 ◽

pp. 144-145

Author(s):

N. Tamura ◽

T. Goto ◽

Y. Harada

Keyword(s):

Temperature Field ◽

Electron Microscope ◽

Field Emission ◽

Resolving Power ◽

High Brightness ◽

Field Emitters ◽

Emission Electron ◽

Sufficient Stability ◽

Scanning Electron ◽

Illuminating System

On account of its high brightness, the field emission electron source has the advantage that it provides the conventional electron microscope with highly coherent illuminating system and that it directly improves the, resolving power of the scanning electron microscope. The present authors have reported some results obtained with a 100 kV field emission electron microscope.It has been proven, furthermore, that the tungsten emitter as a temperature field emission source can be utilized with a sufficient stability under a modest vacuum of 10-8 ~ 10-9 Torr. The present paper is concerned with an extension of our study on the characteristics of the temperature field emitters.

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Multiple-fracturing and viewing of the same frozen sample at different depths using a low temperature FESEM

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100166567 ◽

1996 ◽

Vol 54 ◽

pp. 820-821

Author(s):

M.V. Parthasarathy ◽

C. Daugherty

Keyword(s):

Temperature Field ◽

Low Temperature ◽

Field Emission ◽

Multiple Fracture ◽

Precise Control ◽

Cold Stage ◽

Different Depths ◽

Transfer Device

The versatility of Low Temperature Field Emission SEM (LTFESEM) for viewing frozen-hydrated biological specimens, and the high resolutions that can be obtained with such instruments have been well documented. Studies done with LTFESEM have been usually limited to the viewing of small organisms, organs, cells, and organelles, or viewing such specimens after fracturing them.We use a Hitachi 4500 FESEM equipped with a recently developed BAL-TEC SCE 020 cryopreparation/transfer device for our LTFESEM studies. The SCE 020 is similar in design to the older SCU 020 except that instead of having a dedicated stage, the SCE 020 has a detachable cold stage that mounts on to the FESEM stage when needed. Since the SCE 020 has a precisely controlled lock manipulator for transferring the specimen table from the cryopreparation chamber to the cold stage in the FESEM, and also has a motor driven microtome for precise control of specimen fracture, we have explored the feasibility of using the LTFESEM for multiple-fracture studies of the same sample.

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