id state transformations. This fraction solid represents the cumulative area between the first derivative curve and the baseline. Details of the algorithm used to determine the start and end of the phase(s) formation from the cooling curve is described in detail elsewhere26
and is shown specifically for the Al-Si eutectic phase metallurgical reaction in Figure 5.
Wedge Casting Mould—Stage 1
The geometry of the wedge mould, with downsprue, well basin, filter and runner are shown with dimensions in Figure 6. Solidification rates were controlled by a pure copper chill (95 mm x 235 mm x 36 mm) located at the narrow end of
Figure 3. Plot of the Reduced Pressure Test (RPT) sample density and the measurement using the Alspek In-situ Hydrogen Analyzer for the W319 alloy at 730°C. Each analyzer reading was repeated three times for each density measurement.
Figure 4. Cooling curve and fraction solid curve with marked characteristic points, which indicate the start and end growth of a specific phase reaction (example above for the Al-Si eutectic).20
36 International Journal of Metalcasting/Fall 10
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