|About this Abstract
||Materials Science & Technology 2019
||Additive Manufacturing of Metals: Microstructure and Material Properties of Nickel-based Alloys
||Effect of Part Size on Powder Bed Fusion IN718 Parts
||Oliver Holzmond, Alex Jarama, Guofeng Wang, Xiaodong Li
|On-Site Speaker (Planned)
Additive manufacturing is a promising field, allowing for the feasible production of parts with intricate curves and small geometries. This is particularly exciting for high performance industries where small improvements in efficiency matter. However, these industries also have very tight tolerances, so the mechanical properties of these small parts need to be verified. To this end this study examined the mechanical properties of IN718 tensile specimens of different sizes, and we observed an unexpected relationship between the ultimate tensile strength (UTS) of a material and part size. The UTS of a specimen seemed to increase with decreasing part size up until a point, where it would start to decrease with decreasing part size. This unexpected phenomenon is investigated in depth with optical microscopy, SEM, XCT, and DIC to understand the roles that grain and fracture mechanics, defects, and porosity contribute to the overall size effect of a part.
||Planned: At-meeting proceedings