Due to the stronger bond strength of the Fe-S molecule than that of the Fe-Fe molecule, at the stage of nucleation the surface-segregated sulfur hinders the systematical movement of matrix atoms into the exact positions at the surface for the formation of the (110)001. When the (110) grains form selectively at the strip surface, even a subdivision of a low concentration of surface-segregated sulfur determines, therefore, the degree of disturbance against movement of matrix atoms and, thus, the direction of the (110): the (110)001 at a much lower concentration of surface-segregated sulfur and the (110)vvw{sub}(≠001 under a lower condition of segregated sulfur. Due to the relatively higher mobility of matrix atoms, the probability that, at a fixed final reduction, the (110) grains survive through the selective growth of (100) grains and have finally a chance for selective growth decreases with increasing heating rate.
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