|About this Abstract
||Materials Science & Technology 2020
||Phase Transformations in Additively Manufactured Materials
||Microstructure Engineering through Post-heat Treatment of Inconel 718 Superalloy Made by Laser Powder Bed Fusion
||Yunhao Zhao, Kun Li, Noah Sargent, Wei Xiong
|On-Site Speaker (Planned)
The post-heat treatment is critical to control microstructure and property of additively manufactured (AM) Inconel 718 builds, to which work hardening is no longer applied. Therefore, dedicated investigations should be conducted to understand the heat treatment-microstructure-property relationships of AM Inconel 718. In this work, the effects of homogenization and aging heat treatments on the microstructure and property evolution in Inconel 718 made by laser powder bed fusion are studied by experiments and CALPHAD (calculation of phase diagrams) modeling. It is found the homogenization at a higher temperature than traditional methods can effectively introduce recrystallization and reduce residual strains. This can further remove anisotropic properties through microstructure engineering in the following aging processes. The effects of isochronal aging processes at various temperatures on the materials is investigated by a high-throughput approach. The present work provides a new pathway for the post-processing development of AM Inconel 718.