Visualisation of the Melt Flow under Rotating Magnetic Field

2007 ◽  
pp. 591-598
Author(s):  
Arnold Rónaföldi ◽  
Jenő Kovács ◽  
András Roósz
Keyword(s):  
Magnetic Field ◽  
Rotating Magnetic Field ◽  
Melt Flow

Effect of Crucible Diameter and Wall Roughness on the Melt Flow Generated by Rotating Magnetic Field

2010 ◽  
Vol 659 ◽  
pp. 251-256
Author(s):  
Arnold Rónaföldi ◽  
Jenő Kovács ◽  
András Roósz
Keyword(s):  
Magnetic Field ◽  
Unidirectional Solidification ◽  
Rotating Magnetic Field ◽  
Wall Roughness ◽  
Melt Flow

The effect of flow on the structure of solidified alloys can be investigated by the unidirectional solidification of alloys stirred with a magnetic (magnetohydrodynamics – MHD) method. This MHD method is a rotating magnetic field (RMF)-type. The paper deals with the melt flow generated by this RMF.

scholarly journals The Effect of Rotating Magnetic Field on the Solidified Structure of Sn-Cd Peritectic Alloys

2014 ◽  
Vol 790-791 ◽  
pp. 414-419 ◽  
Author(s):  
Mária Svéda ◽  
Anna Sycheva ◽  
Jenő Kovács ◽  
Arnold Rónaföldi ◽  
András Roósz
Keyword(s):  
Magnetic Field ◽  
Volume Fraction ◽  
Energy Dispersive Spectrometer ◽  
Rotating Magnetic Field ◽  
Image Analyzer ◽  
Melt Flow ◽  
Directionally Solidified ◽  
Peritectic Alloy ◽  
Cellular Microstructure ◽  
Commercially Important

The peritectic alloys, such as some types of steel, Ni-Al, Fe-Ni, Ti-Al, Cu-Sn, are commercially important. In contrast to other types of alloys, many unique structures (e.g. banded or island ones) can form when peritectic alloys are directionally solidified under various solidification conditions. It can be observed in the course of the directional solidification experiments performed in a rotating magnetic field (RMF) that the melt flow has a significant effect on the solidified structure of Sn-Cd alloys. This effect was investigated experimentally for the case of Sn1.6 wt% Cd peritectic alloy. For this purpose, a Bridgman-type gradient furnace was equipped with an inductor, which generates a rotating magnetic field in order to induce a flow in the melt. As a result, the forced melt flow substantially changes the solidified cellular microstructure. The cell size and the volume fraction of the primary tin phase were measured by an image analyzer on the longitudinal polished sections along the entire length of the samples. The microstructure was investigated by scanning electron microscope (SEM) equipped with an energy dispersive spectrometer (EDS).

Revolution Number (RPM) Measurement of Molten Alloy by Pressure Compensation Method

2010 ◽  
Vol 649 ◽  
pp. 275-280 ◽  
Author(s):  
Arnold Rónaföldi ◽  
Jenő Kovács ◽  
András Roósz
Keyword(s):  
Magnetic Field ◽  
Surface Roughness ◽  
Unidirectional Solidification ◽  
Rotating Magnetic Field ◽  
Scale Model ◽  
Melt Flow ◽  
Model Experiments ◽  
Pressure Compensation ◽  
Different Diameters ◽  
Similarity Law

The melt flow has a significant effect on the structure developing during the unidirectional solidification of alloys. This phenomenon can be experienced during the solidification of melts stirred by the rotating magnetic field (RMF)-type magnetohydrodynamic (MHD) facility as well. As it would be very difficult to measure the intensity of melt flow (e.g. its revolution number, angular velocity) during solidification, it seems to be reasonable to perform the so-called "scale model" experiments applied usually in the hydrodynamics. Using the results of these measurements, conclusions can be drawn concerning the flows during solidification by means of the similarity law of hydrodynamics. The revolution number of Ga-In alloy melt placed in the rotating magnetic field can be measured by the equipment developed for performing the "scale model" experiments. The measurements were performed in crucibles with different surface roughness using melt-cylinders with different diameters located in rotating magnetic field having different frequencies and magnetic induction.

Visualisation of the Melt Flow under Rotating Magnetic Field

2007 ◽  
Vol 537-538 ◽  
pp. 591-598 ◽  
Author(s):  
Arnold Rónaföldi ◽  
Jenő Kovács ◽  
András Roósz
Keyword(s):  
Magnetic Field ◽  
Magnetic Induction ◽  
Visual Observation ◽  
Rotating Magnetic Field ◽  
Taylor Number ◽  
Liquid Gallium ◽  
Melt Flow ◽  
Measuring Methods ◽  
The Revolution

Experiments were performed for visual observation and investigation of liquid Gallium flow at a temperature of 40oC in a rotating magnetic field. Two different measuring methods were developed to determine the revolution number of rotating melt. In both cases the frequency of magnetic induction was 50, 100 and 150 Hz and the values of magnetic induction could be changed between 0 and 70 mT. The magnetic Taylor number changed between 0 and 3.54x107 during the experiments.

Microstructure Formation in AlSi6Cu4 Alloy with Forced Melt Flow Induced by a Rotating Magnetic Field

2010 ◽  
Vol 649 ◽  
pp. 249-254 ◽  
Author(s):  
Gerhard Zimmermann ◽  
Viktor T. Vitusevych ◽  
Laszlo Sturz
Keyword(s):  
Magnetic Field ◽  
Primary Dendrite ◽  
Rotating Magnetic Field ◽  
Melt Flow ◽  
Directionally Solidified ◽  
Microstructure Formation ◽  
Cu Alloy ◽  
Radial Segregation ◽  
Al2cu Phase ◽  
Different Types

The objective of this paper is the experimental investigation of the microstructure in Al-6wt%Si-4wt%Cu alloy, directionally solidified without and with forced melt flow, induced by a rotating magnetic field. The flow leads to reduced primary dendrite spacing and to strong radial segregation of silicon and copper. As a consequence the local solidification conditions change, resulting in different types of Al2Cu phase formation. This outcome is explained by ThermoCalc calculations predicting the corresponding solidification behavior.

THE LINEAR NON-IRON INDUCTOR WITH ROTATING MAGNETIC FIELD

2018 ◽  
Vol 2018 (49) ◽  
pp. 39-50
Author(s):  
О. Karlov ◽  
◽  
I. Kondratenko ◽  
R. Kryshchuk ◽  
A. Rashchepkin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Rotating Magnetic Field
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