[1]刘东戎,芦海洋,郭二军. 定向凝固Ti-46at. %Al 合金晶粒组织形成CAFE 模拟[J].哈尔滨理工大学学报,2017,(06):102-108.[doi:10. 15938 /j. jhust. 2017. 06. 019]
 LIU Dong-rong,LU Hai-yang,GUO Er-jun. Simulation of Grain Structure Formation of Ti-46at. %Al AlloyDuring Directional Solidification with CAFE Model[J].哈尔滨理工大学学报,2017,(06):102-108.[doi:10. 15938 /j. jhust. 2017. 06. 019]
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 定向凝固Ti-46at. %Al 合金晶粒组织形成CAFE 模拟()
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《哈尔滨理工大学学报》[ISSN:1007-2683/CN:23-1404/N]

卷:
期数:
2017年06期
页码:
102-108
栏目:
材料科学与工程
出版日期:
2017-12-25

文章信息/Info

Title:
 Simulation of Grain Structure Formation of Ti-46at. %Al Alloy
During Directional Solidification with CAFE Model
文章编号:
1007- 2683( 2017) 06- 0102- 07
作者:
 刘东戎 芦海洋 郭二军
 ( 哈尔滨理工大学材料科学与工程学院,黑龙江哈尔滨150080)
Author(s):
 LIU Dong-rongLU Hai-yangGUO Er-jun
School of Material Science and Engineering,Harbin University of Science and Technology,Harbin 150080,China)
关键词:
 TiAl 合金 CAFE 模拟 晶粒组织 偏析 自然对流
Keywords:
 TiAl alloy cellular automation-finite element simulation grain structure segregationnatural convection
分类号:
TG244
DOI:
10. 15938 /j. jhust. 2017. 06. 019
文献标志码:
A
摘要:
 为了深入理解TiAl 合金定向凝固过程中晶粒组织演化特点,采用CAFE 模型( 元胞自
动机CA - 有限元FE) 模拟研究Ti-46at. % Al 合金定向凝固过程中晶粒组织形成。借助文献中微
重力定向凝固实验结果验证模型。考察了形核过冷度和自然对流强度对柱状晶向等轴晶转变
( CET) 、晶粒尺寸、晶粒延长因子以及偏析分布的影响。模拟结果表明: 降低形核过冷度可以获得
完全等轴晶组织。对于完全等轴晶组织,增大流动强度会加重铸件晶间偏析,而对凝固组织形貌以
及晶粒尺寸、延长因子分布无影响。增加形核过冷度,发生CET。流动强度增加导致CET 延迟,促
进长形晶和等轴晶混合生长,增大晶粒尺寸和延长因子以及加重偏析。CAFE 模型可以被用于预
测TiAl 合金晶粒组织形成以及分析控制机理。
Abstract:
 In order to deeply understand the mechanisms responsible for the grain structure evolution during
directional solidification of Ti-46at. % alloy,characteristics of grain structure were simulated using CAFE model
( Cellular Automaton-Finite Element) . CAFE model was validated by comparisons with microgravity experiments
from a reference. Influences of nucleation undercooling and natural convection intensity on columnar-to-equiaxed
transition ( CET) ,grain size,grain elongation and segregation were numerically investigated. Simulated results
show that a fully equiaxed grain structure is obtained by lowering the nucleation undercooling. Increasing flow
intensity aggravates intergranular segregation,but barely has effects on variations of grain structure morphology and
distributions of grain size and elongation. With a high nucleation undercooling,CET occurs. By strengthening fluid
flow,the occurrence of CET is retarded,a mixed structure of elongated and equiaxed grains is formed,both grain
sizes and elongations are increased and segregation is enhanced. CAFE model can be used to predict grain structure
evolution during solidification of Ti-46at. %Al and to analyze the controlling mechanisms.

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更新日期/Last Update: 2018-03-10