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题名: Influence of cooling rate on the formation of bimodal microstructures in nickel-base superalloys during continuous two-step aging
作者: Yang, M;  Zhang, J;  Wei, H;  Gui, WM;  Su, HJ;  Jin, T;  Liu, L
通讯作者: Zhang, J (reprint author), Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China.
发表日期: 2018-6-15
学科主题: Materials Science, Multidisciplinary
关键词: SINGLE-CRYSTAL SUPERALLOYS;  PHASE-FIELD;  SIZE DISTRIBUTIONS;  GAMMA';  SOLIDIFICATION;  SIMULATION;  EVOLUTION;  PROGRESS;  GROWTH;  ENERGY
摘要: 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.
资助者: National Natural Science Foundation of China - China [51331005, 51690163, 51631008, 51371173, 51771148]; National Key Research and Development Program - China [2016YFB0701405, 2017YFB0702902]
英文摘要: 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.
部门归属: [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
刊名: COMPUTATIONAL MATERIALS SCIENCE
收录类别: SCI
内容类型: 期刊论文
URI标识: http://ir.imr.ac.cn/handle/321006/79284
ISSN号: 0927-0256
语种: 英语
Appears in Collections:中国科学院金属研究所_期刊论文

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Recommended Citation:
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.

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