| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Materials in Energy Environments
|
| Presentation Title |
Unusually High Room and Elevated-Temperature Tensile Properties Observed in Direct Aged Wire-Arc Directed Energy Deposited Inconel 718 |
| Author(s) |
Jie Song, Xavier Jimenez, Carissa Russell, Albert To, Yao Fu |
| On-Site Speaker (Planned) |
Jie Song |
| Abstract Scope |
Inconel 718 (IN718) constituting 70% of the total Ni-based superalloys have been widely used in the hot sections of aerospace turbine engines, oil- and gas-field applications, and nuclear reactors. Wire-arc directed energy deposition (DED) processed IN 718 is known to have coarse columnar grain, strong texture, significant chemical and microstructural inhomogeneity in as-fabricated condition. In this study, direct aging (DA) at 700 C without homogenization has resulted in room-temperature yield strength and ultimate tensile strength that are comparable to wrought condition and among the highest reported properties for wire-arc DED IN718. The DA samples at between 650 C and 750 C aging also demonstrates remarkable ductility at elevated temperatures. These superior mechanical properties are highly likely due to the non-uniform and hierarchical precipitation consisting of γ″ in diameter from a few to tens of nm in the dendritic core area and micron-sized Laves phase and carbides in the inter-dendritic region. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Mechanical Properties |