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Microstructural evolution of a Ni-Co based superalloy during hot compression at gamma ' sub-/super-solvus temperatures
Liu, Peng1,2; Zhang, Rui1; Yuan, Yong3; Cui, Chuanyong1; Liang, Faguang3; Liu, Xi3; Gu, Yuefeng3; Zhou, Yizhou1; Sun, Xiaofeng1
Corresponding AuthorZhang, Rui(rzhang@imr.ac.cn) ; Cui, Chuanyong(chycui@imr.ac.cn)
2021-06-30
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume77Pages:66-81
AbstractThe effects of strain rate on the microstructural evolution and deformation mechanism of a Ni-Co based superalloy were investigated by isothermal compression tests performed at gamma' sub-solvus (1090 degrees C) and gamma' super-solvus temperatures (1150 degrees C) with a wide strain rate range from 0.001 to 10 s(-1) under a true strain of 0.693. Electron backscatter diffraction (EBSD), electron channeling contrast imaging (ECCI) and transmission electron microscope (TEM) techniques were used to characterize the microstructures. The results revealed that the dynamic recrystallization (DRX) volume fraction increased and stored energy of the gamma matrix grains decreased with increasing the strain rate during gamma' sub-solvus temperature deformation, while the opposite phenomena were observed during gamma' super-solvus temperature deformation. The comprehensive effect of initial grain size, primary gamma' phase, twins and adiabatic temperature rise led to these results. The primary gamma' particles undergone the deformation behavior within itself and obviously accelerated the DRX of the matrix. The microstructural evolution proved that discontinuous dynamic recrystallization (DDRX) was the dominant mechanism during the hot deformation carried out at both gamma' sub-solvus and gamma' super-solvus temperatures. Primary gamma' particles obviously accelerated the nucleation step and retarded the growth step of DDRX during gamma' sub-solvus temperature deformation. Besides, the acceleration effect of primary gamma' particles on DDRX increased with the increase of strain rate. Continuous dynamic recrystallization (CDRX) was confirmed to be an assistant mechanism during gamma' super-solvus temperature deformation and was promoted with the increase of strain rate. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
KeywordNi-Co based superalloy Strain rate Primary gamma ' precipitates Dynamic recrystallization Microstructural evolution
Funding OrganizationNational Natural Science Foundation of China ; Ministry of Science and Technology of China
DOI10.1016/j.jmst.2020.10.042
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51671189] ; Ministry of Science and Technology of China[2017YFA0700703and 2019YFA0705304]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000646192100007
PublisherJOURNAL MATER SCI TECHNOL
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/161204
Collection中国科学院金属研究所
Corresponding AuthorZhang, Rui; Cui, Chuanyong
Affiliation1.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
3.Xian Thermal Power Res Inst Co Ltd, Xian 710032, Peoples R China
Recommended Citation
GB/T 7714
Liu, Peng,Zhang, Rui,Yuan, Yong,et al. Microstructural evolution of a Ni-Co based superalloy during hot compression at gamma ' sub-/super-solvus temperatures[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2021,77:66-81.
APA Liu, Peng.,Zhang, Rui.,Yuan, Yong.,Cui, Chuanyong.,Liang, Faguang.,...&Sun, Xiaofeng.(2021).Microstructural evolution of a Ni-Co based superalloy during hot compression at gamma ' sub-/super-solvus temperatures.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,77,66-81.
MLA Liu, Peng,et al."Microstructural evolution of a Ni-Co based superalloy during hot compression at gamma ' sub-/super-solvus temperatures".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 77(2021):66-81.
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