|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Application of Solidification Fundamentals to Challenges in Metal Additive Manufacturing
||Solidification Cracking during Selective Laser Melting (SLM) of Nickel-base Superalloy Inconel-738LC
||Avinash Hariharan, Jeroen Risse, Eric Jägle, Dierk Raabe
|On-Site Speaker (Planned)
In the additive manufacturing of polycrystalline superalloy Inconel-738LC by SLM, the key issue is the formation of solidification cracks at the last stage of solidification. According to most solidification cracking theories, microsegregation of alloying elements to the interdendritic liquid at this stage stablizes it to low temperatures. In addition, these theories also predict different microsegregation behaviour dependent on the misorientation between the growing dendrites. However in the current study, preliminary Atom Probe Tomography (APT) coupled with targeted sample preparation and transmission Kikuchi diffraction (TKD) results show different solute profiles than predicted by the solidification cracking theory. The APT-TKD study reveals a significant increase in the amount of minor alloying elements at the high angle grain boundaries compared to their bulk nominal composition in the matrix. These results are compared to solidification cracking theory and are used to rationalize the contribution of microsegregation to solidification cracking.
||Planned: Supplemental Proceedings volume