|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Integrative Materials Design III: Performance and Sustainability
||Microstructure, Tensile Properties, and Fatigue Crack Growth Mechanisms at the Microstructure Scale in Inconel 718 Manufactured by Laser Engineered Net Shaping
||Yuwei Zhai, Diana A Lados
|On-Site Speaker (Planned)
Laser Engineered Net Shaping (LENS) is a powder-based directed energy deposition process able to fabricate 3D near-net shaped metallic parts. Applying it to structural aerospace components and repair requires a fundamental understanding of both the microstructure and the static and dynamic properties of LENS-fabricated materials. In this study, Inconel 718 was manufactured using two laser power levels, and was investigated in both as-fabricated and heat treated conditions. The effects of processing parameters and heat treatment on microstructure and tensile properties were systematically studied. Thermal histories during LENS fabrication were also investigated, and correlated to the resulting microstructures. Further, both room and elevated temperature fatigue crack growth studies were performed in different orientations with respect to the deposition direction, in order to establish the crack growth mechanisms at the microstructure scale of the alloy. The results will be compared and critically discussed in terms of process optimization and high-integrity design.
||Planned: Supplemental Proceedings volume