Low temperature mechanical behavior of microalloyed and controlled-rolled Fe-Mn-Al-C-X alloys

Abstract

high fractions liquid, as indeed appears to happen. 5 The approximations made in the derivation of [10] make it only semiquantitatively accurate. The percolation model of interdendritic flow implicit in [4] is not accurate at high fractions liquid. 6 Values for the constant n in [10] are difficult to measure. The picture of a defect as an ellipsoidal region of different permeability is certainly an oversimplification. Nevertheless, we believe that the basic conclusions of our analysis are correct: the growth of channel segregates is greatly assisted by the presence of small defects in the dendrite network. Since such defects are unavoidable in a real casting, the condition [10] should provide a more reliable indication of the occurrence of channel segregates than [1]. Another interesting result of the analysis is that channel segregates may form in situations where the interdendritic flow direction is substantially parallel to isotherms. This is because defects oriented out of the plane of the isotherms can divert interdendritic flow to a direction which will lead to channel segregation.