Effect of High Magnetic Field on Diffusion Behavior of Carbon in Pure Iron

2011 ◽  
Vol 194-196 ◽  
pp. 67-70 ◽  
Author(s):  
Yan Wu ◽  
Yan Lu ◽  
Xiang Zhao ◽  
Liang Zuo
Keyword(s):  
Magnetic Field ◽  
High Magnetic Field ◽  
Field Intensity ◽  
Pure Iron ◽  
Magnetic Field Intensity ◽  
Carbon Diffusion ◽  
Field Direction ◽  
Magnetic Field Direction ◽  
Diffusion Behavior ◽  
The Magnetic Field

The effect of magnetic field on diffusion behavior of carbon in pure iron was investigated. The results showed that the magnetic field can accelerate the carbon diffusion when the magnetic field direction is perpendicular to the carburized direction, and this effect increases with the enhancement of magnetic field intensity.

Effects of Magnetic Field Intensity on Carbon Diffusion in Pure Iron in Paramagnetic Ferrite Region

2016 ◽  
Vol 879 ◽  
pp. 2434-2438
Author(s):  
Zhi Wei Zhang ◽  
Yan Wu ◽  
Xiang Zhao
Keyword(s):  
Magnetic Field ◽  
Curie Temperature ◽  
Field Intensity ◽  
Pure Iron ◽  
Magnetic Field Intensity ◽  
Carbon Diffusion ◽  
Magnetic Field Direction ◽  
Direction Parallel ◽  
Ferrite Region ◽  
The Magnetic Field

Effects of magnetic field intensity on carbon diffusion in pure iron in paramagnetic ferrite region above the Curie temperature were investigated using carburizing technology. It was found that the magnetic field intensity can significantly affect the carbon diffusion behavior in pure iron in paramagnetic ferrite region in the direction parallel to the magnetic field direction, both the carbon diffusion coefficient and the average carbon diffusion distance increase gradually with the increasing of the magnetic field intensity. Magnetic field annealing obviously promotes the carbon diffusion in pure iron in the direction parallel to the magnetic field in paramagnetic ferrite region above the Curie temperature, and promotion effect increases with the enhancement of the magnetic field intensity. The structure defects made by the magnetic field may cause the increasing of carbon diffusion flux.

Effects of Magnetic Field Intensity on Carbon Diffusion in Pure Iron in the Single-Phase Austenite Region

2012 ◽  
Vol 706-709 ◽  
pp. 2372-2377 ◽  
Author(s):  
Yan Wu ◽  
Yan Lu ◽  
Xiang Zhao ◽  
Liang Zuo
Keyword(s):  
Magnetic Field ◽  
Field Intensity ◽  
Pure Iron ◽  
Single Phase ◽  
Magnetic Field Intensity ◽  
Isothermal Holding ◽  
Carbon Diffusion ◽  
Magnetic Field Direction ◽  
Magnetic Filed ◽  
The Magnetic Field

Effects of magnetic field intensity on carbon diffusion in pure iron in the single-phase austenite region were investigated. Specimens of high purity iron (99.99%) were buried in an air-proof melting pot filled up with cementation agent, and respectively subjected to isothermal annealing at 930° for 25 min with a heating rate of 5°C /min, and then cooled in the furnace. A magnetic field with different intensity was applied during the whole heating, isothermal holding and cooling processes. The results showed that the magnetic field annealing obviously hinders the carbon diffusion in the direction perpendicular to the magnetic field direction and this effect increased with the enhancement of magnetic filed intensity.

Effects of magnetic field intensity on carbon diffusion coefficient in pure iron in γ-Fe temperature region

2015 ◽  
Vol 29 (10n11) ◽  
pp. 1540001
Author(s):  
Yan Wu ◽  
Guosheng Duan ◽  
Xiang Zhao
Keyword(s):  
Magnetic Field ◽  
Diffusion Coefficient ◽  
Field Intensity ◽  
Temperature Region ◽  
Pure Iron ◽  
Magnetic Field Intensity ◽  
Activation Barrier ◽  
Carbon Diffusion ◽  
Annealed Specimen ◽  
The Magnetic Field

Effects of magnetic field intensity on carbon diffusion coefficient in pure iron in the γ- Fe temperature region were investigated using carburizing technology. The carbon penetration profiles from the iron surface to interior were measured by field emission electron probe microanalyzer. The carbon diffusion coefficient in pure iron carburized with different magnetic field intensities was calculated according to the Fick's second law. It was found that the magnetic field intensity could obviously affect the carbon diffusion coefficient in pure iron in the γ- Fe temperature region, and the carbon diffusion coefficient decreased obviously with the enhancement of magnetic field intensity, when the magnetic field intensity was higher than 1 T, the carbon diffusion coefficient in field annealed specimen was less than half of that of the nonfield annealed specimen, further enhancing the magnetic field intensity, the carbon diffusion coefficient basically remains unchanged. The stiffening of lattice due to field-induced magnetic ordering was responsible for an increase in activation barrier for jumping carbon atoms. The greater the magnetic field intensity, the stronger the inhibiting effect of magnetic field on carbon diffusion.

Etude Numérique de la Section Efficace de Diffusion d'un Faisceau Laser par un Plasma en Champ Magnétique. Application à la Détermination Expérimentale de la Direction du Champ Magnétique de Confinement

1973 ◽  
Vol 51 (3) ◽  
pp. 266-276 ◽  
Author(s):  
R. L. Meyer ◽  
G. Leclert ◽  
M. Felden
Keyword(s):  
Magnetic Field ◽  
Cross Section ◽  
Field Intensity ◽  
Magnetic Field Intensity ◽  
Scattered Wave ◽  
Magnetic Field Direction ◽  
Section Efficace ◽  
Experimental Conditions ◽  
Champ Magnétique ◽  
The Magnetic Field

We study the influence of the magnetic field intensity and direction with respect to the wave vector on the scattering cross-section resonances. We deduce the best experimental conditions for studying these resonances. It is shown that the spectrum modulation of the scattered wave can be used to measure, in some configurations, the confining magnetic field direction.

Effects of High Magnetic Field Heat Treatment on the Microstructure of Fe-0.76%C Alloy

2011 ◽  
Vol 704-705 ◽  
pp. 863-869 ◽  
Author(s):  
Ming Long Gong ◽  
Xiang Zhao ◽  
Chang Shu He ◽  
J.Y. Song ◽  
Liang Zuo
Keyword(s):  
Magnetic Field ◽  
High Magnetic Field ◽  
Lamellar Spacing ◽  
Field Direction ◽  
Magnetic Field Direction ◽  
High Carbon Content ◽  
Proeutectoid Ferrite ◽  
Alloy Microstructure ◽  
And Shifts ◽  
The Magnetic Field

The present studies are to investigate the microstructure features during transformation from austenite to ferrite without and with magnetic field on Fe-0.76%C alloy. It is found that the area fraction and numbers of proeutectoid ferrite grain as well as the lamellar spacing of pearlite in Fe-0.76%C alloy increased considerably with the increase of magnetic field intensity. The reason is that, the magnetic field increases the driving force of proeutectoid ferrite nuclei and shifts the eutectoid point to the side of high carbon content and high temperature, which increases the starting-temperature of the transformation from austenite to ferrite. The proeutectoid ferrite grains are elongated along the magnetic field direction, which can be explained as follows: the proeutectoid ferrite becomes the magnetic dipolar under high magnetic field, and then the polarized austenite atoms are much easier to diffuse into ferrite grains along the magnetic field direction. Key words: high magnetic field; Fe-0.76%C alloy; microstructure

The Lamellar Eutectic Spacing Changes under the High Magnetic Field during the Diffusion of Liquid Al/Solid Cu Process

2010 ◽  
Vol 160-162 ◽  
pp. 603-607
Author(s):  
Bo Xu ◽  
Wei Ping Tong ◽  
Tian You Kang ◽  
Liang Zuo ◽  
Ji Cheng He
Keyword(s):  
Magnetic Field ◽  
Diffusion Process ◽  
High Magnetic Field ◽  
Field Intensity ◽  
Eutectic Alloy ◽  
Magnetic Field Intensity ◽  
High Magnetic Fields ◽  
Lamellar Eutectic ◽  
Eutectic Spacing ◽  
The Magnetic Field

The effect of a high magnetic field (up to 12T) on the lamellar eutectic spacing changes was investigated in the diffusion liquid Al/solid Cu. It was found that the lamellar eutectic alloy is formed in the diffusion process and its spacing has the non-monotonic relationship with the magnetic field intensity. With the increase of magnetic field intensity, the lamellar eutectic spacing decreases rapidly. When the magnetic field intensity B exceeds 4T, the lamellar eutectic spacing begins to increase until 8T, and then, decrease again. This phenomenon could be attributed to the effects of high magnetic fields suppressing nature convection and inducing thermo-electromagnetic convection in the liquid Al.

Effects of Magnetic Field Intensity on Microstructure and Orientation of Proeutectoid Ferrite in Fe-C Alloy

2012 ◽  
Vol 706-709 ◽  
pp. 2680-2684
Author(s):  
Xiao Xue Zhang ◽  
Yu Dong Zhang ◽  
Shou Jing Wang ◽  
Claude Esling ◽  
Xiang Zhao ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Intensity ◽  
Crystallographic Orientation ◽  
Magnetic Field Intensity ◽  
Dipolar Interaction ◽  
Field Direction ◽  
Magnetic Dipolar Interaction ◽  
Proeutectoid Ferrite ◽  
The Magnetic Field

The effects of the magnetic field intensity on microstructure and crystallographic orientation of proeutectoid ferrite in Fe-0.36C alloy have been investigated. Results show that the amount of the Widmänstatten ferrite decreases with the increase of the magnetic field intensity. The transformed proeutectoid ferrite tends to elongate and align along the field direction due to the magnetic dipolar interaction. This tendency is more pronounced when the field intensity increases. Moreover, the enhancement of the <001> fiber component along the traverse field direction by magnetic field is obvious when the field intensity is stronger.

Variation of Surface Tension of Water in High Magnetic Field

2013 ◽  
Vol 750-752 ◽  
pp. 2279-2282 ◽  
Author(s):  
Long Chen ◽  
Chuan Jun Li ◽  
Zhong Ming Ren
Keyword(s):  
Magnetic Field ◽  
Surface Tension ◽  
Magnetic Fields ◽  
Hydrogen Bonds ◽  
High Magnetic Field ◽  
Field Intensity ◽  
Magnetic Field Intensity ◽  
High Magnetic Fields ◽  
The Magnetic Field

The surface tension of water in high magnetic fields up to 10T was investigated with aid of the high-magnetic-field tensiometer (HMFT). It was found that the surface tension of water linearly varied with the magnetic field intensity and increased by 0.48mN/m or 0.65% in 10T. The increase of the surface tension of water could be attributed to the increase in the number and stabilization of the hydrogen bonds in the magnetic field.

A 3 T superconducting magnet for long-run magnetic Compton-scattering experiments

1998 ◽  
Vol 5 (3) ◽  
pp. 937-939 ◽  
Author(s):  
Nobuhiko Sakai ◽  
Hiroshi Ohkubo ◽  
Yasushi Nakamura
Keyword(s):  
Magnetic Field ◽  
Low Temperature ◽  
Compton Scattering ◽  
Superconducting Magnet ◽  
Field Direction ◽  
Compton Profile ◽  
Magnetic Field Direction ◽  
Long Run ◽  
Radiation Shields ◽  
The Magnetic Field

A 3 T superconducting magnet has been designed and constructed for magnetic Compton-profile (MCP) measurements with the new capabilities that the magnetic field direction can be altered quickly (within 5 s) and liquid-He refill is not required for more than one week. For the latter capability, two refrigerators have been directly attached to the cryostat to maintain the low temperature of the radiation shields and for the recondensation of liquid He. The system has been satisfactorily operated for over one week.

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