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Homogenization Kinetics of a Nickel-based Superalloy Produced by Powder Bed Fusion Laser Sintering



Fan Zhang, Lyle E. Levine, Andrew J. Allen, Eric Lass, Sudha Cheruvathur, Mark R. Stoudt, Maureen E. Williams, Yaakov S. Idell, Carelyn E. Campbell


Additively manufactured (AM) metal components often exhibit fine dendritic microstructures and elemental segregation due to the initial rapid solidification and subsequent melting and cooling during the build process, which without homogenization would adversely affect materials performance. In this letter, we report in situ observation of the homogenization kinetics of an AM nickel-based superalloy using synchrotron small angle X-ray scattering. The identified kinetic time scale is in good agreement with thermodynamic diffusion simulation predictions using microstructural dimensions acquired by ex situ scanning electron microscopy. These findings could serve as a recipe for predicting, observing, and validating homogenization treatments in AM materials.
Scripta Materialia


Additive manufacturing, microstructure, in situ, small angle scattering, microsegregation, kinetics


Zhang, F. , Levine, L. , Allen, A. , Lass, E. , Cheruvathur, S. , Stoudt, M. , Williams, M. , Idell, Y. and Campbell, C. (2017), Homogenization Kinetics of a Nickel-based Superalloy Produced by Powder Bed Fusion Laser Sintering, Scripta Materialia, [online], (Accessed May 28, 2024)


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Created January 26, 2017, Updated November 10, 2018