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Solidification Characteristic and Segregation Behavior of a New Nickel Base K4750 Alloy
Yu Xun1,2; Wang Linlin2; Ou Meiqiong1; Ma Yingche1; Xin Qibin2; Liu Kui1
Corresponding AuthorMa Yingche(ycma@imr.ac.cn)
2019-05-01
Source PublicationRARE METAL MATERIALS AND ENGINEERING
ISSN1002-185X
Volume48Issue:5Pages:1488-1496
AbstractThe solidification microstructures and elemental microsegregation behavior of a new Ni-base superalloy K4750 was comparatively investigated by differential thermal analysis (DTA), Thermo-Calc calculation and isothermal solidification quenching (ISQ) experiment. The results of ISQ indicate that the temperature of liquidus and solidus of K4750 alloy are 1350 degrees C and 1270 degrees C, respectively, and the precipitated temperature of MC carbide is 1320 degrees C. The temperature of liquidus obtained by DTA and Thermal-Calc is in close agreement with the result of ISQ, but the temperature of solidus obtained by DTA and Thermal-Calc are 1306 C and 1296 C, respectively. In the initial stage of the solidification process, the volume fraction of residual liquid decreases sharply. In solidification process within the temperature range of 1310 degrees C similar to 1290 degrees C, the residual liquid in the interdendritic region transforms from connected channels to isolated micro-liquid pools. In the last stage of solidification, these isolated micro-liquid pools are quite sluggish and result in the formation of porosity. The microsegregation coefficients of W, Fe and Cr are larger than 1, so they are considered to be negative segregation elements and segregate in solid. In contrast, the microsegregation coefficients of Ti, Nb, C and Mo are less than 1, and thus they are positive segregation elements and segregated in the liquid.
Keywordelement segregation Thermal-Calc calculation Ni-based superalloy
Indexed BySCI
Language英语
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000470794300019
PublisherNORTHWEST INST NONFERROUS METAL RESEARCH
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/133989
Collection中国科学院金属研究所
Corresponding AuthorMa Yingche
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
2.Northeastern Univ, Shenyang 110819, Liaoning, Peoples R China
Recommended Citation
GB/T 7714
Yu Xun,Wang Linlin,Ou Meiqiong,et al. Solidification Characteristic and Segregation Behavior of a New Nickel Base K4750 Alloy[J]. RARE METAL MATERIALS AND ENGINEERING,2019,48(5):1488-1496.
APA Yu Xun,Wang Linlin,Ou Meiqiong,Ma Yingche,Xin Qibin,&Liu Kui.(2019).Solidification Characteristic and Segregation Behavior of a New Nickel Base K4750 Alloy.RARE METAL MATERIALS AND ENGINEERING,48(5),1488-1496.
MLA Yu Xun,et al."Solidification Characteristic and Segregation Behavior of a New Nickel Base K4750 Alloy".RARE METAL MATERIALS AND ENGINEERING 48.5(2019):1488-1496.
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