Acta Metall Sin  2004, Vol. 40 Issue (4): 439-444     DOI:

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THREE DIMENSIONAL NUMERICAL SIMULATION OF SOLIDIFICATION MICROSTRUCTURE OF SINGLE PHASE ALLOY

LIANG Zuojian; XU Qingyan; LI Jiarong; YUAN Hailong; LIU Shizhong; LIU Baicheng

Department of Mechanical Engineering; Tsinghua University; Beijing 100084

LIANG Zuojian; XU Qingyan; LI Jiarong; YUAN Hailong; LIU Shizhong; LIU Baicheng. THREE DIMENSIONAL NUMERICAL SIMULATION OF SOLIDIFICATION MICROSTRUCTURE OF SINGLE PHASE ALLOY. Acta Metall Sin, 2004, 40(4): 439-444 .

Abstract References Related Articles Recommended Metrics Download:  PDF(308KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Based on the physical process of nucleation and growth of grains and basic transfer equations such as heat and solute transfer equations, a mathematical model for the three--dimensional simulation of microstructure, microsegregation and free dendritic growth of single phase alloys was developed. Many factors such as constitutional undercooling, curvature undercooling and anisotropy, which have vital influence on the evolution of microstructure, were considered in the model. Simulated results show that the nucleation, growth, CET and microstructure evolution of free dendritic crystal could be predicted reasonably and the calculated results are coincident with actual phenomena. Simulations of free dendritic growth indicate that the curvature undercooling has a significant effect on the dendritic growth and final microstructure pattern. The dendritic grain profiles, in which a great number of regular and parallel secondary dendritic arms exist, tend to be formed at high intensity of anisotropy. At the low intensity of anisotropy, however, near octahedral grain profiles with small protuberances of surface tend to be obtained. The existence of small molten pools in interdendritic areas during solidification was confirmed by the simulated results, which is helpful to understand the formation of microstructure related defects such as microsegregation and microporosity. Key words:  microstructure      numerical simulation      single phase alloy       Received:  16 April 2003      ZTFLH:  TG244   Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors LIANG Zuojian XU Qingyan LI Jiarong YUAN Hailong LIU Shizhong LIU Baicheng URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2004/V40/I4/439 [1] Flemings M C, Cahn R W. Acta Mater, 2000; 48: 371 [2] Liu B C. 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