Journal
MATERIALS CHARACTERIZATION
Volume 66, Issue -, Pages 68-74Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2012.02.008
Keywords
Alloy 690; Grain boundary; Segregation; Carbide; Atom probe tomography
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Funding
- National Basic Research Program of China [2011CB610502]
- National Natural Science Foundation of China [50974148]
- Shanghai Leading Academic Discipline Project [S30107]
- Shanghai University
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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.
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