%0 Journal Article
%T Numerical simulation of macro--segregation with equiaxed grains movement<br>等轴晶移动对宏观偏析影响的数值模拟
%A MA Changwen SHEN Houfa HUANG Tianyou LIU Baicheng
%A <br>马长文
%A 沈厚发
%A 黄天佑
%A 柳百成
%J 材料研究学报
%D 2004
%I 
%X A mathematical model of equiaxed grains movement and macro-segregation has been built to analyze the fluid flow and species distribution during the metal solidification. The mushy zone was divided into dendrites region and free equiaxed grains region by the dendritic coherency point. Macro-segregation of a steel ingot in a rectangular mold with a riser was simulated and the calculation result was compared with that of an experiment. It shows that the species distribution obtained by the grain movement model is more consistent with experiment comparing to that by the solid skeleton model in mush. The equiaxed grains move with the fluid and accumulate at the bottom center of the ingot during solidification. The cone-shape negative segregation forms after solidification. The positive segregation in the upper center and the negative segregation in the exterior region of the ingot are found at the same time.
%K foundational discipline in materials science
%K metal solidification
%K macro-segregation
%K numerical simulation
%K free equiaxed grains
%K dendritic coherency<br>材料科学基础学科
%K 金属凝固
%K 宏观偏析
%K 数值模拟
%K 自由等轴晶
%K 枝晶密排面
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=84529CA2B2E519AC&jid=C101C4C04993B4D94FCD8446E6CBEB3B&aid=FE9FED3B4F14C22C&yid=D0E58B75BFD8E51C&vid=13553B2D12F347E8&iid=38B194292C032A66&sid=2B25C5E62F83A049&eid=9CA95D22FC1D537C&journal_id=1005-3093&journal_name=材料研究学报&referenced_num=3&reference_num=16