IMR OpenIR
Effects of Nitrogen Addition on Microstructure and Grain Boundary Microchemistry of Inconel Alloy 690
Chen Bo; Hao Xianchao; Ma Yingche; Cha Xiangdong; Liu Kui
Corresponding AuthorChen Bo(bchen@imr.ac.cn)
2017-08-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume53Issue:8Pages:983-990
AbstractInconel alloy 690 is an austenitic nickel-based corrosion resistant alloy with about 30% Cr, which is considered as the most ideal steam generator tubing materials in nuclear power plants because of its superior resistance to intergranular attack (IGA). However, the existence of impurities and the addition of minor alloying elements cause significant difference of carbide morphology, microstructure and chromium depletion of Inconel alloy 690. In this work, the microstructure and grain boundary chemistry of Inconel alloy 690 with four different nitrogen contents have been investigated by SEM and TEM. Stacking fault probability (SFP) and IGA with respect to the microstructure was tested and analyzed. The results indicated that thermal treatment at 715 degrees C following solution annealing (SA) at 1080 degrees C caused a wide range of intergranular carbide morphology with the associated chromium depletion in the vicinity of grain boundaries. With the increasing of nitrogen content, the characters of the carbides ranged from thin continuous bands along boundaries to coarse discrete particles. Stacking fault probability was increased with the increasing of nitrogen content, and the value reached the peak at 100x10(-6) of nitrogen content, then it dropped. The corrosion tests showed that moderate nitrogen content alloy performed favorable intergranular attack correlated with the presence of semi-continuous grain boundary carbide and chromium depletion was mitigated. The consequent nitrides were appeared in high nitrogen alloy. So, about 100x10(-6) contents of nitrogen in alloy 690 is suitable by synthesis considering of carbides, nitrides and chromium depletion.
KeywordInconel alloy 690 microstructure carbide N
DOI10.11900/0412.1961.2016.00545
Indexed BySCI
Language英语
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000409252600010
PublisherSCIENCE PRESS
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/124941
Collection中国科学院金属研究所
Corresponding AuthorChen Bo
AffiliationChinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
Recommended Citation
GB/T 7714
Chen Bo,Hao Xianchao,Ma Yingche,et al. Effects of Nitrogen Addition on Microstructure and Grain Boundary Microchemistry of Inconel Alloy 690[J]. ACTA METALLURGICA SINICA,2017,53(8):983-990.
APA Chen Bo,Hao Xianchao,Ma Yingche,Cha Xiangdong,&Liu Kui.(2017).Effects of Nitrogen Addition on Microstructure and Grain Boundary Microchemistry of Inconel Alloy 690.ACTA METALLURGICA SINICA,53(8),983-990.
MLA Chen Bo,et al."Effects of Nitrogen Addition on Microstructure and Grain Boundary Microchemistry of Inconel Alloy 690".ACTA METALLURGICA SINICA 53.8(2017):983-990.
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