Abstract
Abstract Effect of external stress on pearlite transformation in a high-carbon steel was examined in terms of the measurement of volume change during isothermal holding. Two dimensional measurement of the steel holding at various temperatures under constant stress condition clarified anisotropic transformation plasticity, which means that the volume measurements are necessary to examine the transformation behaviors quantitatively. According to the measurement of volume change, it was found that the larger loading brings the shorter incubation time when compared at the same transformation temperature. These changes can be represented by the Johnson-Mehl-Avrami-Kolmogorov type equation with four constants when the transformation temperature is adequately deviated from the bainite start temperature.
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