Investigation of grain competitive growth during directional solidification of single-crystal nickel-based superalloys

被引：5
|
作者：
Zhao, Xinbao [1 ,2 ]
Liu, Lin [2 ]
Zhang, Jun [2 ]
机构：
[1] Xian Thermal Power Res Inst Co Ltd, Natl Energy R&D Ctr Clean & High Efficiency Fossi, Xian 710032, Peoples R China
[2] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
来源：
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 2015年 / 120卷 / 02期
基金：
中国国家自然科学基金;
关键词：
STRAY GRAINS; ORIENTATION; MECHANISM; EVOLUTION; TEXTURE; REGION; SHAPE;
D O I：
10.1007/s00339-015-9290-1
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Grain competitive growth of nickel-based single-crystal superalloys during directional solidification was investigated. A detailed characterization of bi-crystals' competitive growth was performed to explore the competitive grain evolution. It was found that high withdrawal rate improved the efficiency of grain competitive growth. The overgrowth rate was increased when the misorientation increased. Four patterns of grain competitive growth with differently oriented dispositions were characterized. The results indicated that the positive branching of the dendrites played a significant role in the competitive growth process. The effect of crystal orientation and heat flow on the competitive growth can be attributed to the blocking mechanism between the adjacent grains.
引用
收藏
页码：793 / 800
页数：8
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