About this Abstract |
Meeting |
2020 AWS Professional Program
|
Symposium
|
2020 AWS Professional Program
|
Presentation Title |
Investigation of Laves Phase Formation in Inconel 718 Fabricated by Laser Powder Bed Fusion |
Author(s) |
Selda Nayir, James Scott Zuback, Bertrand Max, Simon Perusin, Todd Palmer |
On-Site Speaker (Planned) |
Selda Nayir |
Abstract Scope |
The present study focused on Additively manufactured (AM) IN718 produced with Powder bed fusion process. The as-deposited samples are solutionized between 1000-1200˚C for 0.5h-4h, quenched, and characterized according to the build direction. The analyzed microstructures showed phase formations, especially seen around the grain boundaries. The phase chemistry measured with Energy Dispersive Spectroscopy (EDS) and compared with thermodynamically computed phases based on the Scheil-Gulliver model. The finding suggests that the phase is closely related to the computed laves phase. The other characterization methods, such as Electron Backscatter Diffraction (EBSD) also used to support this argument by analyzing Kikuchi patterns. Another finding is that a change in solutionizing temperature caused a difference in the volume fraction and morphologies of the laves phase. The goal of the study is to produce a time/temperature plot of solutionizing heat treatment that entails the required solutionzing time to dissolve the precipitates seen in the structure. In addition, producing a time-temperature-transformation (TTT) diagrams to find a heat treatment-cooling procedure that can avoid the phase formation. |
Proceedings Inclusion? |
Definite: Other |