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Influence of cooling rate on the formation of bimodal microstructures in nickel-base superalloys during continuous two-step aging
Yang, M; Zhang, J; Wei, H; Gui, WM; Su, HJ; Jin, T; Liu, L; Zhang, J (reprint author), Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China.
2018-06-15
Source PublicationCOMPUTATIONAL MATERIALS SCIENCE
ISSN0927-0256
Volume149Pages:14-20
AbstractThe formation and evolution of bimodal microstructures during the continuous two-step aging in nickel-base single crystal superalloys are simulated through phase-field method. The change of gamma'/gamma lattice misfit from the first to the secondary aging temperature has been considered in present model. The focus of this study is to explore the influence of cooling rate (after the first aging) on the evolutions of primary and secondary gamma' precipitates. It is demonstrated that the primary gamma' precipitates formed in the first aging become more cubic during the secondary aging. With the cooling rate increasing, the precipitation number and the growth rate of secondary gamma' precipitate are increased during the followed secondary aging. And the size of secondary gamma' precipitate is also the biggest for the case after the high-speed cooling based on the contributions of the greatest chemical driving force and massive coalescences of neighboring secondary gamma' precipitates. Besides, the precipitation of secondary gamma' phase from the.-channel occurs only when the.-channel width is greater than a critical value, and in present work, the critical value is about 35 nm, 52.5 nm and 87.5 nm, respectively, for the case after high-speed, medium and low-speed cooling.; The formation and evolution of bimodal microstructures during the continuous two-step aging in nickel-base single crystal superalloys are simulated through phase-field method. The change of gamma'/gamma lattice misfit from the first to the secondary aging temperature has been considered in present model. The focus of this study is to explore the influence of cooling rate (after the first aging) on the evolutions of primary and secondary gamma' precipitates. It is demonstrated that the primary gamma' precipitates formed in the first aging become more cubic during the secondary aging. With the cooling rate increasing, the precipitation number and the growth rate of secondary gamma' precipitate are increased during the followed secondary aging. And the size of secondary gamma' precipitate is also the biggest for the case after the high-speed cooling based on the contributions of the greatest chemical driving force and massive coalescences of neighboring secondary gamma' precipitates. Besides, the precipitation of secondary gamma' phase from the.-channel occurs only when the.-channel width is greater than a critical value, and in present work, the critical value is about 35 nm, 52.5 nm and 87.5 nm, respectively, for the case after high-speed, medium and low-speed cooling.
description.department[yang, min ; zhang, jun ; su, haijun ; liu, lin] northwestern polytech univ, state key lab solidificat proc, xian 710072, shaanxi, peoples r china ; [wei, hua] zhejiang univ, ctr centrifugal hypergrav res, hangzhou 310058, zhejiang, peoples r china ; [gui, weimin ; jin, tao] chinese acad sci, inst met res, superalloys div, shenyang 110016, liaoning, peoples r china
KeywordSingle-crystal Superalloys Phase-field Size Distributions Gamma' Solidification Simulation Evolution Progress Growth Energy
Subject AreaMaterials Science, Multidisciplinary
Funding OrganizationNational Natural Science Foundation of China - China [51331005, 51690163, 51631008, 51371173, 51771148]; National Key Research and Development Program - China [2016YFB0701405, 2017YFB0702902]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79284
Collection中国科学院金属研究所
Corresponding AuthorZhang, J (reprint author), Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China.
Recommended Citation
GB/T 7714
Yang, M,Zhang, J,Wei, H,et al. Influence of cooling rate on the formation of bimodal microstructures in nickel-base superalloys during continuous two-step aging[J]. COMPUTATIONAL MATERIALS SCIENCE,2018,149:14-20.
APA Yang, M.,Zhang, J.,Wei, H.,Gui, WM.,Su, HJ.,...&Zhang, J .(2018).Influence of cooling rate on the formation of bimodal microstructures in nickel-base superalloys during continuous two-step aging.COMPUTATIONAL MATERIALS SCIENCE,149,14-20.
MLA Yang, M,et al."Influence of cooling rate on the formation of bimodal microstructures in nickel-base superalloys during continuous two-step aging".COMPUTATIONAL MATERIALS SCIENCE 149(2018):14-20.
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