Microstructure of Carbides at Grain Boundaries in Nickel Based Superalloys

J. Mater. Sci. Technol. ›› 2012, Vol. 28 ›› Issue (11): 1031-1038.

• High Temperature Structural Materials • Previous Articles Next Articles

Microstructure of Carbides at Grain Boundaries in Nickel Based Superalloys

Xiaoming Dong¹⁾, Xiaoli Zhang²⁾, Kui Du¹⁾, Yizhou Zhou²⁾, Tao Jin²⁾, Hengqiang Ye¹⁾

1) Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2) Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Received:2012-04-17 Revised:2012-07-09 Online:2012-11-09 Published:2012-11-09
Contact: Kui Du
Supported by:
National Natural Science Foundation of China (Nos. 50671109, 51171188, 50921004 and U1037601) and the Hundred Talents Project of the Chinese Academy of Sciences

Abstract

Abstract:

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 γ/γ´ matrix were also determined.

Key words: Electron microscopy , Ni based superalloys , Grain boundaries , Orientation relationship

Xiaoming Dong, Xiaoli Zhang, Kui Du, Yizhou Zhou, Tao Jin, Hengqiang Ye. Microstructure of Carbides at Grain Boundaries in Nickel Based Superalloys[J]. J. Mater. Sci. Technol., 2012, 28(11): 1031-1038.

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Microstructure of Carbides at Grain Boundaries in Nickel Based Superalloys

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