Transformations near the Edge of a Thin Semi-Infinite Plate

2 Transformations near the Edge of a Thin Semi-Infinite Plate 

1 Nuclei cannot form outside the sample and hence cannot influence the transformation anywhere inside it. 

To apply Eq. 21.4, an expression for the volume of a right circular time cone of height t having its axis located at (s, y) is required. When s Rt, the cone volume Vc is given by Eq. 21.10 for the d = 2 case, and the edge 8 = 0 has no influence on the transformation kinetics. When s Rt, the time cone is truncated as in Fig. 21.3a. Its volume may be expressed in terms of quantities shown in Fig. 21.36 and c its base radius, Rt, height, t, and the distance of the truncated face from the cone axis, s. 

Horizontal cross section through truncated portion of time cone. 

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