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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Cast Shop Technology
Presentation Title Resonance for Contactless Ultrasonic Treatment in Direct Chill Casting
Author(s) Catherine E H Tonry, Valdis Bojarevics, Georgi Djambazov, Koulis Pericleous
On-Site Speaker (Planned) Catherine E H Tonry
Abstract Scope Grain refinement is desirable in direct chill (DC) casting. Ultrasonic treatment (UST) has been proven to be a grain refinement technique. Immersed sonotrodes have been employed for this purpose to treat alloys both within the launder or directly in the sump. We propose an alternative electromagnetic (EM) technique used directly in the caster. This ‘contactless sonotrode’ technique uses a kilohertz frequency induction coil tuned to reach acoustic resonance within the melt pool. The technique has been successfully used in batch to refine the microstructure and degas aluminum in a crucible. We extend numerical models, coupling electromagnetics, fluid flow, gas cavitation, heat transfer and solidification to examine use in the DC process. Simulations show that a consistent resonant mode is obtainable within a vigorously mixed melt pool, with pressures high enough to achieve cavitation. It is expected conditions in the mushy zone due to cavitation would promote dendrite fragmentation.
Proceedings Inclusion? Planned: Light Metals

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Comparison of AA6060 Grain Structures Achieved Using AMG’s TiBAl Advance™ and Alternative Al-Ti-B Grain Refiners via a 1D Upward Solidification Device
Automated Chemical Analysis of Liquid Aluminum for Process Control
Automated Metal Cleanliness Analyzer (AMCA) – An Alternative Assessment of Metal Cleanliness in Aluminum Melts
Characteristic Impurities of Silicon Metal SI-441 as Additive Material to Produce Aluminium Foundry Alloy A356.2
Characterization of Ingots Cast with the APEX™ Casting System
Compaction of Aluminium Foil and Its Effect on Oxidation and Recycling Yield
Compression Testing of Ceramic Foam Filters (CFFs) Submerged in Aluminium at Operating Temperature
Coupled Modeling of Misrun, Could Shut, Air Entrainment and Porosity for High Pressure Die Casting Applications
Effect of Steam on Aluminium Packaging Multilayers
Effect of Ultrasonic Melt Treatment on the Sump Profile and Microstructure of a Direct-chill Cast AA6008 Aluminum Alloy
Grain Refinement Efficiency
Impact of COVID-19 on the British Foundries
Influence of Mg Concentration on the Inhibiting Effect of CO2 on the Oxidation Rate of Aluminum Alloys 5182 and 6016
Introductory Comments: Cast Shop Technology
Mechanism of High Grain Refinement Effectiveness on New Grain Refiner “TiBAl Advance”
Molecular Dynamics Simulations of the Evolution of Residual Stresses during Rapid Solidification of Aluminium
Molten Aluminium Transfer: Review and Comparison of Different Technologies
NatureAlu: Manufacturing High Purity Aluminum from the Concept Idea to the Production Plant
Next-generation Electrical Preheating System for Filter Boxes
Overview of the Possibilities and Limitations of the Characterization of Ceramic Foam Filters for Metal Melt Filtration
Reducing Gas Shrinkage Porosity in AlMg Alloy Slabs
Reduction of Impurity Elements by Applying Electromagnetic Stirring in Fractional Crystallization
Residual Stress Prediction in the Casting Process of Automotive Powertrain Components
Resonance for Contactless Ultrasonic Treatment in Direct Chill Casting
Simulation-based Analysis for Optimization of Casting Process in AA7075
Study on the Mechanical Properties of Commercial Vehicle Wheel Through the Molten-Forged on the A356 Alloy with a Multi-cavity Fabrication Process
The Effect of Grain Refiner on Aluminium Filtration
The Impact of Casting Conditions on Edge Cracking of AA5182 Ingots during Hot Rolling
The Influence of the Casting Speed in Horizontal Continuous Casting of Aluminium Alloy EN AW 6082
Ultrasonic Melt Treatment in a DC Casting Launder: The Role of Melt Processing Temperature

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