|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Atom Probe Tomography for Advanced Characterization of Metals, Minerals and Materials
||Correlative Transmission EBSD-APT Analysis of Grain Boundaries in Additively Manufactured Nickel-base Superalloy Inconel-738LC
||Avinash Hariharan, Jeroen Risse, Eric Jägle, Dierk Raabe
|On-Site Speaker (Planned)
A key issue during the additive manufacturing of polycrystalline nickel-base superalloy Inconel-738LC by selective laser melting, is the formation of microcracks at grain boundaries. Microsegregation of alloying elements to interdendritic liquid during the last stage of solidification can lead to increased crack susceptibility. Post solidification, all cracks are observed on high angle grain boundaries. In the current study, we use Atom Probe Tomography (APT) and transmission EBSD (t-EBSD) to analyze the chemical composition profile of the alloying elements across grain boundaries with unambiguously identified misorientation. We characterize the chemical composition profile at high-angle and low-angle grain boundaries with microcracks and on those that are devoid of cracks. The coupled APT and t-EBSD study reveals a significant variation in the distribution of minor alloying elements at different grain boundaries.
||Planned: Supplemental Proceedings volume