Abstract
A non-invasive sensor based on high-energy x-ray computed tomography has been developed for monitoring the progression of solidification in metal casting. The sensor comprised a 6 MeV linear accelerator and a 128-channel CdWO 4 detector array. Laboratory experiments were performed on cylindrical castings of pure aluminum and its alloys. The sensor produced a series of time-lapse images showing the movement of the liquid/solid interface during solidification. The solidification front was imaged every two minutes with a planar spatial resolution of 1.6 mm and a contrast sensitivity of 1.5%. The tomography results agreed well with those obtained by thermocouple measurements.
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