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

Published

January 26, 2017

Author(s)

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

Abstract

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.

Citation

Scripta Materialia

Volume

131

Pub Type

Journals

Download Paper

DOI Link

Keywords

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

Citation

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], https://doi.org/10.1016/j.scriptamat.2016.12.037 (Accessed April 29, 2024)