Experimental Study of the Effect of Intermittent Electromagnetic Stirring On the Columnar-Equiaxed Transition In Sn–10wt.%Pb Alloy Solidification

2021 ◽  
Author(s):  
Abdelhafidh Abdelhakem ◽  
Lakhdar Hachani ◽  
Kader Zaidat ◽  
Ibrahim Sari ◽  
Yves Fautrelle
Keyword(s):  
Magnetic Field ◽  
Experimental Study ◽  
Thermal Field ◽  
Solidification Process ◽  
Electromagnetic Stirring ◽  
Transition Mechanism ◽  
Channel Segregation ◽  
Buoyancy Forces ◽  
Stabilizing Effect ◽  
Traveling Magnetic Field

Abstract Experimental analysis of stratification, electromagnetic stirring and solidification were carried out for two solidification experiments for a binary Sn-10wt.%Pb alloy. The objective of this study is to examine the effect of forced convection driven by an Intermittent Traveling Magnetic Field (I-TMF) on the solidification process. Several aspects were investigated, namely thermal field, macrostructure, and ?nally segregation behaviour, as well as, morphology. The effect of the both thermal and solutal stratification on the intensity of the flow is discussed yet, showed that stratification has a stabilizing effect for the flow, which can also slow the convective hydrodynamic movements generated by the buoyancy forces. The consequence of this stratification on macrosegregations and channel segregation, which develop during the solidification period, is experimentally analysed. Electromagnetic stirring by intermittent traveling magnetic promotes the development of the columnar-equiaxed transition mechanism (CET), more particularly the refinement of the grain size. The results illustrate, also, that electromagnetic stirring effectively diminish macrosegregations significantly, while remaining inactive for reducing channels segregation development.

scholarly journals Liquid Metal Flow Under Traveling Magnetic Field—Solidification Simulation and Pulsating Flow Analysis

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 532
Author(s):  
Evgeniy Shvydkiy ◽  
Egbert Baake ◽  
Diana Köppen
Keyword(s):  
Magnetic Field ◽  
Liquid Metal ◽  
Neutron Radiography ◽  
Metal Flow ◽  
Flow Analysis ◽  
Solidification Process ◽  
Electromagnetic Stirring ◽  
Pulsation Frequency ◽  
Conductive Liquid ◽  
Traveling Magnetic Field

Non steady applied magnetic field impact on a liquid metal has good prospects for industry. For a better understanding of heat and mass transfer processes under these circumstances, numerical simulations are needed. A combination of finite elements and volumes methods was used to calculate the flow and solidification of liquid metal under electromagnetic influence. Validation of numerical results was carried out by means of measuring with ultrasound Doppler velocimetry technique, as well as with neutron radiography snapshots of the position and shape of the solid/liquid interface. As a result of the first part of the work, a numerical model of electromagnetic stirring and solidification was developed and validated. This model could be an effective tool for analyzing the electromagnetic stirring during the solidification process. In the second part, the dependences of the velocity pulsation amplitude and the melt velocity maximum value on the magnetic field pulsation frequency are obtained. The ability of the pulsating force to develop higher values of the liquid metal velocity at a frequency close to the MHD resonance was found numerically. The obtained characteristics give a more detailed description of the electrically conductive liquid behaviour under action of pulsating traveling magnetic field.

Effect of Alternating Traveling Magnetic Field on the Removal of Inclusions from Aluminum Melt

2014 ◽  
Vol 1061-1062 ◽  
pp. 55-60
Author(s):  
Hong Zhang Deng ◽  
Qiu Lin Li ◽  
Ding Guo Yang ◽  
Wei Liu
Keyword(s):  
Magnetic Field ◽  
Solidification Process ◽  
Primary Silicon ◽  
Aluminum Melt ◽  
Agglomeration Effect ◽  
Traveling Magnetic Field ◽  
Silicon Particles

Alternating traveling magnetic field (TMF) was introduced to agglomerate the inclusions with a density smaller than surrounding melt. Primary silicon particles precipitating from the solidification process of hypereutectic Al-Si alloy was regarded as inclusions need removing. Results indicated that alternating TMF was more effective to promote the inclusions to agglomerate into clusters than downward TMF. The effect of alternating TMF to agglomerate the inclusions increases with the increase of current and frequency. There exists the best alternating time to get the best agglomeration effect. In this study, 10s is the best alternating time.

scholarly journals Liquid Metal Flow under Traveling Magnetic Field: Solidification Simulation and Pulsating Flow Analysis

2020 ◽  
Author(s):  
Evgeniy Shvydkiy ◽  
Egbert Baake ◽  
Diana Köppen
Keyword(s):  
Magnetic Field ◽  
Liquid Metal ◽  
Neutron Radiography ◽  
Liquid Metals ◽  
Metal Flow ◽  
Flow Analysis ◽  
Electromagnetic Stirring ◽  
Pulsation Frequency ◽  
Conductive Liquid ◽  
Traveling Magnetic Field

Non steady applied magnetic field impact on a liquid metals has good prospects for industry. For a better understanding of heat and mass transfer processes under these circumstances, numerical simulations are needed. A combination of finite elements and volumes methods was used to calculate the flow and solidification of liquid metal under electromagnetic influence. Validation of numerical results was carried out by means of measuring with ultrasound Doppler velocimetry technique, as well as with neutron radiography snapshots of the position and shape of the solid/liquid interface. As a result of the first part of the work, a numerical model of electromagnetic stirring and solidification was developed and validated. This model could be an effective tool for analyzing the electromagnetic stirring during the solidification process. In the second part, the dependences of the velocity pulsation amplitude and the melt velocity maximum value on the magnetic field pulsation frequency are obtained. It was found numerically the ability of the pulsating force action to develop higher values of the liquid metal velocity at a frequency close to the MHD resonance. Obtained characteristics give a more detailed description of the electrically conductive liquid behaviour under action of pulsating traveling magnetic field.

Sign in / Sign up

Export Citation Format

Share Document