Christopher Lefky1 Owen Hildreth1

1, Arizona State University, Tempe, Arizona, United States

Sacrificial supports are an inconvenient necessity in traditional 3D printing processes. It is both time consuming and expensive to remove these supports, included to alleviate thermal strains and allow for the fabrication of overhanging features. Recently, dissolvable supports have been introduced for powder-bed fusion (PBF) printed stainless steel components. This processes was easily introduced during a post-processing heat treatment, in which a sensitizing agent introduced chromium carbides into the initial ~100 µm of material. The sensitized material was electrochemically dissolved resulting in the supports being detached from the component. Inconel 718 (IN718) is a commonly used superalloy that includes elements such as niobium and titanium to protect the alloy from sensitization through the formation of primary carbides. This work will present the adaptation of dissolvable metal supports to IN718 and report on the microstructure following sensitization and during dissolution. Specifically, the effect of microstructure on dissolution along with processing parameters will be reported.