Microstructure of Carbides at Grain Boundaries in Nickel Based Superalloys

It is well known that carbides at grain boundaries play an nickel based superalloys. In order to deeply understand the mportant role in affecting mechanical properties of relationship between grain boundary structures and properties, in this work, we have investigated the microstructure of grain bou...

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Bibliographic Details
Published in:Journal of materials science & technology 2012-11, Vol.28 (11), p.1031-1038
Main Authors: Dong, Xiaoming, Zhang, Xiaoli, Du, Kui, Zhou, Yizhou, Jin, Tao, Ye, Hengqiang
Format: Article
Language:English
Subjects:
Bicrystals
Carbides
Electron microscopy
Fluctuation
Grain boundaries
M23C6
MC型碳化物
MC碳化物
Mechanical properties
Microstructure
Ni based superalloys
Nickel base alloys
Orientation relationship
Superalloys
化学组合物
微观结构
晶界碳化物
机械性能
镍基高温合金
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Summary:It is well known that carbides at grain boundaries play an nickel based superalloys. In order to deeply understand the mportant role in affecting mechanical properties of relationship between grain boundary structures and properties, in this work, we have investigated the microstructure of grain boundaries with different misorienta- tion 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 γ/γ1 matrix were also determined.
ISSN:1005-0302
1941-1162
DOI:10.1016/S1005-0302(12)60169-8