Microstructure of Carbides at Grain Boundaries in Nickel Based Superalloys

查看全文 作　　者：Xiaoming [1]Dong;Xiaoli [2]Zhang;Kui [1]Du;Yizhou [2]Zhou;Tao [2]Jin;Hengqiang [1]Ye

机构地区：[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

出　　处：《Journal of Materials Science & Technology》索引2012年第28卷第11期,共8页

基　　金：the National Natural Science Foundation of China(Nos.50671109,51171188,50921004 and U1037601);the Hundred Talents Project of the Chinese Academy of Sciences for financial support 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 M 23 C 6 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 M 23 C 6 and M 6 C 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. 关键词：镍基高温合金晶界碳化物微观结构 MC型碳化物 M23C6 MC碳化物机械性能化学组合物

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Microstructure of Carbides at Grain Boundaries in Nickel Based Superalloys

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