铸造2012，Vol.61Issue(12)：1415-1421,7.
考虑包晶相的Ti-Al合金定向凝固枝晶生长数值模拟
Numerical Simulation of Dendritic Growth During Directional Solidification Considering Peritectic Phase
摘要
Abstract
In the present paper, numerical models for microstructure evolution during directional solidification process of Ti-Al alloy were developed on the basis of modified cellular automaton (MCA) method, which took into account the peritectic reaction and peritectic transformation.The models were applied to the simulation of the formation of petitectic phase and the competitive growth of columnar dendrites with different preferred growth orientation during directional solidification process of Ti-47A1 (atomic fraction, %) alloy using liquid metal cooling (LMC) method.Simulations of microstructure evolution during directional solidification were performed at the thermal gradient of 40 K/cm and 80 K/cm, and simulated results were compared with corresponding experiments of Ti-47Al-2Cr-2Nb.Simulated and experimental results show that columnar grains were well aligned along the growth direction from the bottom up to the upper part of the ingot at 80 K/cm, and compared with columnar grains obtained at the thermal gradient of 40 K/cm, the primary dendrite arm spacing decreased.关键词
Ti-Al合金/定向凝固/包晶反应/微观组织模拟/温度梯度Key words
Ti-Al-alloy/ directional solidification/ peritectic reaction/ simulation of microstructure/ thermal gradient分类
矿业与冶金引用本文复制引用
徐吉祥,许庆彦,程锦,张虎,柳百成..考虑包晶相的Ti-Al合金定向凝固枝晶生长数值模拟[J].铸造,2012,61(12):1415-1421,7.基金项目
国家重点基础研究发展计划项目(2005CB724105,2011CB706801) （2005CB724105,2011CB706801）
国家自然科学基金项目(10477010,51171089). （10477010,51171089）
