Abstract
The use of eddy currents to nondestructively evaluate metallic solidification is modelled in one dimension. Calculated responses of the reflected signals show characteristics that can be identified with different solidification morphologies, the extent of freezing, and temperature changes. Experimental verification of the calculated results is done with lead and a lead-20 tin alloy. Morphological details of the solidification for both lead and lead-20 tin alloy are extracted from the eddy current responses in real time. Features such as uniform freezing front motion in pure lead and phase formation in the alloy are detected. Finally, compensation for the thermal gradients in the copper mold and the phase shift in the balancing network allow for good agreement between the eddy current response and the calculated response for freezing.
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