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Study of Microsegregation and Laves Phase in INCONEL718 Superalloy Regarding Cooling Rate During Solidification

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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.

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Notes

  1. INCONEL718 is a trademark of Special Metals Corporation, Huntington, WV.

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Acknowledgments

This work is sponsored by the Shanghai Rising-Star Program (Grant No. 13QA1401800), Specialized Research Fund for the Doctoral Program of Higher Education (Grant No. 20120073110007), and the Program for Science and Technology Development of Shanghai (Grant No. 11521100703).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, P.R. China

    Lishibao Ling (Postdoctoral Candidates), Wei Zhou (Postdoctoral Candidates), Maodong Kang (Postdoctoral Candidates) & Baode Sun (Professors)

  2. Shanghai Key Lab of Advanced High-Temperature Materials and Precision Forming, Shanghai Jiao Tong University, No. 800 Dongchuan Road, Shanghai, 200240, P.R. China

    Yanfeng Han (Lecturer), Haiyan Gao (Associate Professor), Da Shu (Professor), Jun Wang (Professors) & Baode Sun (Professors)

  3. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, No. 800 Dongchuan Road, Shanghai, 200240, P.R. China

    Jun Wang (Professors) & Baode Sun (Professors)

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  1. Lishibao Ling
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  2. Yanfeng Han
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  3. Wei Zhou
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Correspondence to Yanfeng Han.

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Manuscript submitted June 23, 2014.

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Ling, L., Han, Y., Zhou, W. et al. Study of Microsegregation and Laves Phase in INCONEL718 Superalloy Regarding Cooling Rate During Solidification. Metall Mater Trans A 46, 354–361 (2015). https://doi.org/10.1007/s11661-014-2614-5

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  • DOI: https://doi.org/10.1007/s11661-014-2614-5

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