C-Cr segregation at grain boundary before the carbide nucleation in Alloy 690

被引：47

作者：

Li, Hui ^{[1
,2
]}

Xia, Shuang ^{[2
]}

Zhou, Bangxin ^{[2
]}

Liu, Wenqing ^{[1
]}

机构：

[1] Shanghai Univ, Lab Microstruct, Shanghai 200444, Peoples R China

[2] Shanghai Univ, Inst Mat, Shanghai 200072, Peoples R China

来源：

MATERIALS CHARACTERIZATION | 2012年 / 66卷

基金：

中国国家自然科学基金;

关键词：

Alloy; 690; Grain boundary; Segregation; Carbide; Atom probe tomography; HEAT-TREATMENT; PRECIPITATION; CHEMISTRY; MICROSTRUCTURE; MORPHOLOGY; EVOLUTION; BEHAVIOR;

D O I：

10.1016/j.matchar.2012.02.008

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The grain boundary segregation in Alloy 690 was investigated by atom probe tomography. B, C and Si segregated at the grain boundary. The high concentration regions for each segregation element form a set of straight arrays that are parallel to each other in the grain boundary. plane. The concentration fluctuation has a periodicity of about 7 nm in the grain boundary plane. Before the Cr23C6 nucleation at grain boundaries, the C-Cr co-segregate on one side of the grain boundaries while not the exact grain boundary core regions have been detected. The reasons why grain boundary carbides have coherent orientation relationship only with one side of nearby grain which grain boundary is located at high index crystal plane were discussed. (C) 2012 Elsevier Inc. All rights reserved.

引用

页码：68 / 74

页数：7

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