Elements segregation and phase precipitation behavior at grain boundary in a Ni-Cr-W based superalloy

被引：34
作者：
Dong, Ruifeng [1 ]
Li, Jinshan [1 ]
Zhang, Tiebang [1 ]
Hu, Rui [1 ]
Kou, Hongchao [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2016年 / 122卷
基金：
中国国家自然科学基金;
关键词：
Ni-based superalloy; Grain boundary; Element segregation; Carbides precipitation; M23C6 CARBIDE PRECIPITATION; ALLOY; 690; STAINLESS-STEELS; HOT CORROSION; MORPHOLOGY; MISORIENTATION; CREEP;
D O I：
10.1016/j.matchar.2016.11.002
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this work, grain boundary (GB) carbides and GB segregation are investigated on the basis of GB characteristics. The M23C6-type carbides are found to be the dominant GB carbides. GB M23C6 carbides prefer to precipitate at the general high-angle grain boundaries (HAGBs), while the Sigma 3 coherent twin boundaries with low interfacial energy are generally immune to precipitate M23C6. Correspondingly, a distinct segregation is observed at general HAGBs, and unobvious segregation is detected at Sigma 3 coherent twin boundaries. Combined with GB segregation and orientation relationship (OR) between GB M23C6 and gamma matrix, the precipitation mechanism of GB M23C6 is proposed. (C) 2016 Elsevier Inc. All rights reserved.
引用
收藏
页码：189 / 196
页数：8
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