Effects of Nitrogen Addition on Microstructure and Grain Boundary Microchemistry of Inconel Alloy 690

doi:10.11900/0412.1961.2016.00545

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
通讯作者	Chen Bo(bchen@imr.ac.cn)
	2017-08-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	53 期号:8 页码:983-990
摘要	Inconel 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.
关键词	Inconel alloy 690 microstructure carbide N
DOI	10.11900/0412.1961.2016.00545
收录类别	SCI
语种	英语
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000409252600010
出版者	SCIENCE PRESS
引用统计	被引频次：6[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/124941
专题	中国科学院金属研究所
通讯作者	Chen Bo
作者单位	Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 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.