Influence of cooling rate on the formation of bimodal microstructures in nickel-base superalloys during continuous two-step aging

CORC > 金属研究所 > 中国科学院金属研究所

	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.
刊名	COMPUTATIONAL MATERIALS SCIENCE
	2018-06-15
卷号	149 页码:14-20
关键词	Single-crystal Superalloys Phase-field Size Distributions Gamma' Solidification Simulation Evolution Progress Growth Energy
ISSN号	0927-0256
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.; 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.
学科主题	Materials Science, Multidisciplinary
语种	英语
资助机构	National Natural Science Foundation of China - China [51331005, 51690163, 51631008, 51371173, 51771148]; National Key Research and Development Program - China [2016YFB0701405, 2017YFB0702902]
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79284]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhang, J (reprint author), Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China.
推荐引用方式 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.