|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Defects and Properties of Cast Metals
||Reducing Freckle Formation with External Magnetic Fields
||Andrew Kao, Koulis Pericleous
|On-Site Speaker (Planned)
The formation of freckles during the production of Ni superalloy turbine blades can be detrimental to their performance. Freckles have been shown to form when channels of solute ejecting buoyant plumes become stable during casting. The authors present numerically the use of external magnetic fields for destabilising these channels and so reducing the chance of a defect forming. By turning on and off a DC magnetic field to this system, electromagnetic damping and modification to the thermodynamic interface equilibrium may be able to destabilise these channels. Though the use of a fully coupled numerical model that includes solidification, fluid flow and electromagnetism, this paper investigates the effects the magnetic field will have on plume formation, the underlying microstructure and flow driven by Thermoelectric Magnetohydrodynamics; a secondary phenomenon introduced by the magnetic field.
||Planned: Supplemental Proceedings volume