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Study on the Precipitation of gamma ' in a Fe-Ni Base Alloy During Ageing by APT
Song Yuanyuan; Zhao Mingjiu; Rong Lijian
Corresponding AuthorRong Lijian(ljrong@imr.ac.cn)
2018-09-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume54Issue:9Pages:1236-1244
AbstractHigh 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.
KeywordFe-Ni base alloy gamma ' phase ageing nanocluster APT
Funding OrganizationNational Natural Science Foundation of China ; China Academy of Engineering Physics
DOI10.11900/0412.1961.2017.00563
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China ; China Academy of Engineering Physics[U1730140]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000440840000002
PublisherSCIENCE PRESS
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/128915
Collection中国科学院金属研究所
Corresponding AuthorRong Lijian
AffiliationChinese Acad Sci, CAS Key Lab Nucl Mat & Safety Assessment, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
Recommended Citation
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.
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