Microstructure of Carbides at Grain Boundaries in Nickel Based Superalloys

被引：99
作者：
Dong, Xiaoming [1 ]
Zhang, Xiaoli
Du, Kui [1 ]
Zhou, Yizhou
Jin, Tao
Ye, Hengqiang [1 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
来源：
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2012年 / 28卷 / 11期
基金：
中国国家自然科学基金;
关键词：
Electron microscopy; Ni based superalloys; Grain boundaries; Orientation relationship; PRIMARY MC CARBIDE; CREEP-PROPERTIES; DECOMPOSITION; RUPTURE; RR2072;
D O I：
10.1016/S1005-0302(12)60169-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
It is well known that carbides at grain boundaries play an important role in affecting mechanical properties of nickel based superalloys. In order to deeply understand the relationship between grain boundary structures and properties, in this work, we have investigated the microstructure of grain boundaries with different misorientation angles in bicrystals of nickel based superalloys. It is found that the bicrystals with smaller misorientation angles contain denser M23C6 but sparse MC particles at grain boundaries, and this kind of bicrystals presents longer stress rupture lives. It was observed that MC carbides were decorated by M23C6 and M6C particles at grain boundaries. The formation of these carbide particles, therefore, is likely due to the local fluctuation of chemical composition around MC carbides. In addition, the orientation relationships between MC carbides and gamma/gamma' matrix were also determined.
引用
收藏
页码：1031 / 1038
页数：8
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