Abstract
Laser surface remelting experiments have been carried out in Fe-12Cr-nC alloys in order to characterize the effect of growth velocity on the microstructural scale and the mode of solidification. Two types of growth morphologies have been observed: cellular/dendritic at a low carbon content and dendritic at a high carbon content. The existing band of primary spacings for a given solidification condition was characterized and confirmed. A recent analytical expression by Hunt and Lu for cellular and dendritic structures was compared to the experimentally measured primary arm spacings, and a good agreement was obtained. Further, the relationship between the primary spacing and the dendrite-tip radius was also determined and compared to the experimental results using a simple geometrical consideration between the dendrite-tip radius and the primary spacing. Finally, a theoretical microstructural map was constructed and compared to the experimental results. A good agreement between the observed and the calculated phases was obtained.
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