|About this Abstract
||Materials Science & Technology 2020
||Additive Manufacturing: Qualification and Certification
||Reducing Anisotropic Deformation of LPBF Inconel 718 for Applications in Extreme Conditions
||Nadia Kouraytem, John Varga, Benham Amin-Ahmadi, Raphael A. Chanut, Ashley D. Spear, Owen T. Kingstedt
|On-Site Speaker (Planned)
Inconel 718 (IN718) parts manufactured using manufacturer recommended processing parameters using laser powder bed fusion (LPBF) exhibit columnar microstructures that grow along the build direction. Subsequently, as-built and direct-aged IN718 specimens were shown to deform anisotropically under quasi-static and high-strain rate uniaxial compression when loaded in the sweep or transverse direction. In this investigation, a non-conventional short-time-scale recrystallization post-processing heat treatment is presented to reduce anisotropy in the deformation of LPBF IN718 specimens extracted from a large additively manufactured volume of material. However, the recrystallized samples surprisingly show an increase in the yield strength compared to the as-built condition. The improved yield strength of the material is related to the underlying microstructure resulting from the heat treatment. The outcomes of this study are important for qualification of structural parts where reduced anisotropy combined with improvement in the yield strength are necessary in the case of loading under extreme conditions.