Abstract
An experimental technique was developed to measure the interface temperature of directionally transformed pearlite. It was shown that the growth temperature of such forced velocity pearlite is the same as the growth temperature of isothermally formed pearlite which grows at the same velocities. It was also shown that forced velocity pearlite is kinetically limited to maximum growth rates of around 100 μm per second. It was demonstrated that a small but significant fraction of prior austenite grain boundaries interferes with pearlite growth by halting the growth of the cementite lamellae. Velocityvs spacing data were found to fit an equation of the formV ∝ S -n withn = 2.07. Arguments are presented which indicate that previous literature values ofn = 2.4 and 2.7 may be high due to experimental difficulties.
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