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Unveiling the Re effect on long-term coarsening behaviors of ? ' precipitates in Ni-based single crystal superalloys
Lu, Fan1; Antonov, Stoichko2; Lu, Song1; Zhang, Jiachen3; Li, Longfei1; Wang, Dong4; Zhang, Jian4; Feng, Qiang1
Corresponding AuthorLi, Longfei(lilf@skl.ustb.edu.cn) ; Feng, Qiang(qfeng@skl.ustb.edu.cn)
2022-07-01
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume233Pages:16
AbstractIn response to the increased demand for very long-term service reliability of industrial gas turbine (IGT) blades, the microstructural stability of two single crystal (SX) superalloys with different Re addition (0Re and 2Re in wt.%, named as alloy 0Re5Ta and 2Re5Ta) were investigated during long-term thermal exposure ( > 50 0 0 h) at 900 degrees C, with the help of atom probe tomography (APT) and high-temperature X-ray diffraction (XRD) analysis. During long-term thermal exposure, the gamma ' precipitates coarsened gradually in both alloys. At the same time, the gamma ' precipitates became more cuboidal for alloy 0Re5Ta and nearly spherical for alloy 2Re5Ta due to the increased positive lattice misfit for alloy 0Re5Ta and the decreased negative lattice misfit for alloy 2Re5Ta. Such lattice misfit evolution was mainly attributed to the inversion of the W partitioning from gamma matrix to gamma ' precipitates over time. The addition of Re can effectively decrease the coarsening rate during thermal exposure. Further investigations on the coarsening kinetics confirmed the Re effect on reducing the interfacial energy and enhancing the rate-limiting effect of Cr. Additional particle size distributions (PSDs) showed a gradual transition from the initial matrixdiffusion coarsening-controlled mechanism to the interface-diffusion coarsening-controlled mechanism at prolonged time, wherein Re triggered the interface-diffusion mechanism earlier by leading to sharper interfaces. Although Re increases the magnitude of the lattice misfit in the initial microstructure, it can significantly enhance the microstructural stability of SX superalloys for IGT application.(c) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
KeywordNickel-based single crystal superalloy Rhenium-effect Long-term thermal exposure Atom-probe tomography Coarsening kinetics
Funding OrganizationNational Science and Technology Major Project ; National Natural Science Foundation of China ; Key-Area Re-search and Development Program of Guangdong Province ; 111 Project ; Alexander von Humboldt Foundation
DOI10.1016/j.actamat.2022.117979
Indexed BySCI
Language英语
Funding ProjectNational Science and Technology Major Project[2017-VI-0 0 02-0 072] ; National Natural Science Foundation of China[51631008] ; National Natural Science Foundation of China[91860201] ; Key-Area Re-search and Development Program of Guangdong Province[:2019B010943001] ; 111 Project[B170 0 03] ; Alexander von Humboldt Foundation
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000799051000005
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/174231
Collection中国科学院金属研究所
Corresponding AuthorLi, Longfei; Feng, Qiang
Affiliation1.Univ Sci & Technol Beijing, Beijing Adv Innovat Ctr Mat Genome Engn, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China
2.Max Planck Inst Eisenforschung GmbH, Dept Microstruct Phys & Alloy Design, D-40237 Dusseldorf, Germany
3.Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xi'an 710072, Peoples R China
4.Chinese Acad Sci, Inst Met Res, Superalloys Div, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Lu, Fan,Antonov, Stoichko,Lu, Song,et al. Unveiling the Re effect on long-term coarsening behaviors of ? ' precipitates in Ni-based single crystal superalloys[J]. ACTA MATERIALIA,2022,233:16.
APA Lu, Fan.,Antonov, Stoichko.,Lu, Song.,Zhang, Jiachen.,Li, Longfei.,...&Feng, Qiang.(2022).Unveiling the Re effect on long-term coarsening behaviors of ? ' precipitates in Ni-based single crystal superalloys.ACTA MATERIALIA,233,16.
MLA Lu, Fan,et al."Unveiling the Re effect on long-term coarsening behaviors of ? ' precipitates in Ni-based single crystal superalloys".ACTA MATERIALIA 233(2022):16.
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