| Abstract Scope |
Depending on the level of complexity, feature resolution, and overall component size, one may choose a specific additive manufacturing process over another. Furthermore, each manufacturing process tends to result in different microstructural scale due to the differences in thermal history within the process. However, it is less clear how crystallographic texture develops differently in different additive manufacturing processes, and how these differences can influence the degree of mechanical property anisotropy that results. In this work, IN625 is studied across AM methods given its wide range of applications and its tendency to maintain the primary solidified phase throughout processing. Samples produced with laser powder bed fusion, laser powder directed energy deposition (DED), gas metal arc DED, and electron beam DED are characterized. Electron backscatter diffraction and color tint etching with optical microscopy are employed to gather grain size and texture data, given the variability of each across processes. Solidification models and predictions of heat transfer are discussed to rationalize the differences in texture observed across the various additive manufacturing technologies. The results of this work are expected to provide a deeper understanding of microstructure and texture development for a wide range of additive manufacturing methods to accelerate their adoption for structural applications. |