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- Title
Study of Microsegregation and Laves Phase in INCONEL718 Superalloy Regarding Cooling Rate During Solidification.
- Authors
Wang, Jun; Sun, Baode; Ling, Lishibao; Zhou, Wei; Kang, Maodong; Han, Yanfeng; Gao, Haiyan; Shu, Da
- Abstract
Cooling rate is an important and controllable variable in casting processing. The effect of cooling rate on the microsegregation and Laves phase in INCONEL718 superalloy castings was studied by high-temperature-laser confocal scanning microscopy and quantitative metallography in this study. The transformation rate of solid phase with a feature of Gaussian distribution in the solidifications at the cooling rates of 0.10 to 14 K/s is acquired. The solidification time and secondary dendrite arm spacing (SDAS) as a function of cooling rate are analyzed. The amount of Laves phase presents a maximum value at a threshold cooling rate of 3 K/s owing to the opposite effects of cooling rate on the solidification time and SDAS. A modified dimensionless microsegregation index criterion was used for the scaling of solute segregation and Laves phase depending on cooling rates. The prediction of maximal microsegregation and the amount of Laves phase by MSI and experiments provide a guide for cooling rate control in the casting applications.
- Subjects
COOLING loads (Mechanical engineering); CASTING (Manufacturing process); LAVES phases (Metallurgy); HEAT resistant alloy metallography; SOLID phase extraction; SOLIDIFICATION
- Publication
Metallurgical & Materials Transactions. Part A, 2015, Vol 46, Issue 1, p354
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-014-2614-5