Study on dendritic growth of FE-0.82WT%C alloy

Abstract

A series of mathematical models and codes are developed to investigate the dendritic growth of Fe-0.82wt%C alloy. It is found that the small columnar dendrites are growing under the restriction of neighboring bigger ones and will be eventually combined to form the stronger columnar dendrites. With the decrease of cooling intensity, the primary dendrite arm spacing increases, and the secondary arms become undeveloped. The melt flow influencing the solute distribution around the solid dendrites promotes the asymmetrical growth of equiaxed dendrites, and generally inhibits columnar dendritic growth except at downstream side under weak flow intensity. The growth behavior of dendrites under melt flow is determined by the competition between bringing in solute enriched melt from upstream side and carrying away solute rejected at local interfaces.