LAMELLAR EUTECTICS - A COMPARISON OF 3 MODELS VALID AT HIGH GROWTH-RATES

A growth model for lamellar eutectic growth developed on the basis of an exact numerical solution for the concentration field in front of th e solid-liquid interface is presented. This model is valid at high gro wth rates, without any constraint on the phase diagram shape. The resu lts obtained from this model for the Fe-Fe3C system are compared with the results obtained with frequently used growth models, based on anal ytical approximate solutions. For high growth rates, the interface und ercooling and the limiting velocity show significant differences betwe en the models.