In-situ Observation of Solidification Process of GH3625 Superalloy at Different Cooling Rates

doi:10.11896/j.issn.1005-023X.2017.024.030

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	In-situ Observation of Solidification Process of GH3625 Superalloy at Different Cooling Rates
	Ding, Yutian; Dou, Zhengyi; Gao, Yubi; Gao, Xin; Li, Haifeng; Liu, Dexue
刊名	Cailiao Daobao/Materials Review
	2017-12-25
卷号	31 期号:12 页码:150-155
关键词	Carbides Cooling Differential scanning calorimetry Grain boundaries Infrared imaging Laser applications Scanning Scanning electron microscopy Spectrometers Superalloys Confocal laser scanning microscope Cooling rates Differential scanning calorimeters Energy dispersive spectrometers Infrared image furnaces Laves-phase Precipitation sequence Solidified microstructures
ISSN号	1005023X
DOI	10.11896/j.issn.1005-023X.2017.024.030
英文摘要	The solidification process of the GH3625 superalloy was in-situ observed at different cooling rates (30/min, 100/min and 200/min ) by means of confocal laser scanning microscope combined with an infrared image furnace. Differential scanning calorimeter (DSC), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were adopted to observe the solidified microstructure and the regularity of precipitated phases. The results showed that the liquidus temperature of GH3625 superalloy was 1 356.5, and the relationship between the variation of solid phase content at the free surface and temperature as well as time was in accordance with Avrami equation. With the decrease of temperature, the precipitation sequence of phases were γ matrix phase, carbides and Laves phase. In the solidification process of GH625 superalloy, with the increasing cooling rate, the dendritic structure refined, the dendrite arm spacing decreased, component segregation reduced, the Laves phase distribution was more dispersed, and mainly precipitated eutectic Laves phase. A large number of Nb segregation occurred in the final period of solidification at the interdendritic and grain boundaries, and this mainly contributes to the formation of Laves phase. © 2017, Materials Review Magazine. All right reserved.
语种	中文
出版者	Cailiao Daobaoshe/ Materials Review
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/114324]
专题	省部共建有色金属先进加工与再利用国家重点实验室材料科学与工程学院
作者单位	Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, College of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Ding, Yutian,Dou, Zhengyi,Gao, Yubi,et al. In-situ Observation of Solidification Process of GH3625 Superalloy at Different Cooling Rates[J]. Cailiao Daobao/Materials Review,2017,31(12):150-155.
APA	Ding, Yutian,Dou, Zhengyi,Gao, Yubi,Gao, Xin,Li, Haifeng,&Liu, Dexue.(2017).In-situ Observation of Solidification Process of GH3625 Superalloy at Different Cooling Rates.Cailiao Daobao/Materials Review,31(12),150-155.
MLA	Ding, Yutian,et al."In-situ Observation of Solidification Process of GH3625 Superalloy at Different Cooling Rates".Cailiao Daobao/Materials Review 31.12(2017):150-155.