Relationship between degeneration of M7C3 and precipitation of M23C6 in a cobalt base superalloy

被引：11

作者：

Jiang, WH ^{[1
]}

Yao, XD

Guan, HR

Hu, ZQ

机构：

[1] Acad Sinica, Inst Met Res, Dept Superalloys, Shenyang 110015, Peoples R China

[2] Shenyang Polytech Univ, Dept Met Mat Engn, Shenyang 110023, Peoples R China

来源：

MATERIALS SCIENCE AND TECHNOLOGY | 1999年 / 15卷 / 05期

关键词：

D O I：

10.1179/026708399101506157

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The relationship between degeneration of the primary M7C3 carbide and precipitation of the secondary M23C6 carbide has been investigated in a cobalt base superalloy after 100 h aging at 850 degrees C. The results indicated that the primary M7C3 carbide could not transform in situ into the secondary M23C6 carbide. The M23C6 formed by a direct reaction between chromium and carbon atoms. The dissolution of M7C3 provided the precipitation of M23C6 with essential carbon, which acted as a carbon reservoir. Near M7C3, the chromium content is a controlling factor of M23C6 precipitation while away from it, the carbon content dominated the reaction. The precipitate free zone around M7C3 is attributed to chromium depletion which is inherited from the as cast condition. MST/4174

引用

页码：596 / 598

页数：3