Study on the Precipitation of gamma ' in a Fe-Ni Base Alloy During Ageing by APT

doi:10.11900/0412.1961.2017.00563

IMR OpenIR

	Study on the Precipitation of gamma ' in a Fe-Ni Base Alloy During Ageing by APT
	Song Yuanyuan; Zhao Mingjiu; Rong Lijian
通讯作者	Rong Lijian(ljrong@imr.ac.cn)
	2018-09-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	54 期号:9 页码:1236-1244
摘要	High strength Fe-Ni base austenitic alloys, such as A286 and JBK-75, are widely used in gas turbine jet engines and hydrogen service and so on because of their excellent corrosion resistance and low hydrogen embrittlement sensitivity. The ordered coherent gamma' [Ni-3(Al, Ti)], precipitated during ageing, is thought to have the main contribution on the strength. Thus, it is very important to understand the characterization of the precipitation. However, few previous studies are focused on atomic scale evolution of the precipitated phase. Atom probe tomography (APT) is a unique microscopy technique that provides 3D analytical mapping of materials at near atomic resolution and a high detection sensitivity for all elements. The present research is focused on the microstructure evolution at ageing temperature at different time scales using APT. A Fe-Ni base austenite alloy were aged at 620 degrees Cfor different time after solution treated at 980 degrees C for 2 h. Hardness testing indicates that a sharp increase is observed when the ageing time is less than 6 h. The hardness is up to 205 HV from the initial 145 HV at the ageing time 6 h. After that the hardness increases slowly. The hardness is 251 HV at 120 h. APT results reveal that Ti-rich nano-clusters precipitate obviously at the initial stage of ageing, which contain Fe, Cr, Ni, Mo and Al elements. As the ageing time increases, more Ni and Al atoms are segregated in the Ti-rich nanoclusters while the Fe, Cr and Mo are ejected from the nanoclusters. When the ageing time is up to 120 h, the Ni/(Ti+Al) ration is approximately close to 3. The precipitates can be identified as gamma' phase. The results reveal that the formation of gamma' involves nucleation and growth. Effect of the number density and the size of the gamma' precipitates on the hardening of the alloy has been estimated.
关键词	Fe-Ni base alloy gamma ' phase ageing nanocluster APT
资助者	National Natural Science Foundation of China ; China Academy of Engineering Physics
DOI	10.11900/0412.1961.2017.00563
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China ; China Academy of Engineering Physics[U1730140]
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000440840000002
出版者	SCIENCE PRESS
引用统计	被引频次：7[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/321006/128915
专题	中国科学院金属研究所
通讯作者	Rong Lijian
作者单位	Chinese Acad Sci, CAS Key Lab Nucl Mat & Safety Assessment, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Song Yuanyuan,Zhao Mingjiu,Rong Lijian. Study on the Precipitation of gamma ' in a Fe-Ni Base Alloy During Ageing by APT[J]. ACTA METALLURGICA SINICA,2018,54(9):1236-1244.
APA	Song Yuanyuan,Zhao Mingjiu,&Rong Lijian.(2018).Study on the Precipitation of gamma ' in a Fe-Ni Base Alloy During Ageing by APT.ACTA METALLURGICA SINICA,54(9),1236-1244.
MLA	Song Yuanyuan,et al."Study on the Precipitation of gamma ' in a Fe-Ni Base Alloy During Ageing by APT".ACTA METALLURGICA SINICA 54.9(2018):1236-1244.