| The detailed transmission electron microscopy(TEM) was conducted to study the growth mechanism of pearlite. The experiments were performed using vanadium carbonitrides, which precipitate during the pearlite growth in the Fe-C-V and Fe-C-V-Mn alloys, in order to trace the sequences of the pearlite growth. The growth mechanism based on the present experimental results are presented in the following two papers. In this first paper, the interphase boundary precipitation(IBP) accompanied with the pearlite growth is presented. The main features of IBP are : (a) IBP arrays are observed not only in the normal pearlite area but also in the lamellae fault area. In addition, IBP arrays are also found at the lamellar holes; (b) The characteristics of IBP, such as spacing, direction and the crystallographic orientation with the pearlitic ferrite matrix, remain unchanged during the pearlite growth. It was also found that the perturbation of the lamellar structure did not alter the characteristics of IBP; (c) The rows of IBP arrays are not parallel but inclined with respect to the nodule boundaries. Based on the present experimental observations, the integrated growth mechanism of pearlite will is presented in the following paper. |
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