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Meeting Materials Science & Technology 2020
Symposium Additive Manufacturing: Qualification and Certification
Presentation Title Reducing Anisotropic Deformation of LPBF Inconel 718 for Applications in Extreme Conditions
Author(s) Nadia Kouraytem, John Varga, Benham Amin-Ahmadi, Raphael A. Chanut, Ashley D. Spear, Owen T. Kingstedt
On-Site Speaker (Planned) Nadia Kouraytem
Abstract Scope 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.
Proceedings Inclusion? Undecided


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CT Based Analysis of Generation and Characterization of Parameter- and Process-induced Defects in Powder Bed Fusion Additive Manufacturing
Effect of Sample Geometry and Orientation on Tensile Properties of Ti-6Al-4V Manufactured by Electron Beam Melting
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Influence of Printing Parameters within the Binder-powder Interaction
Introductory Comments: Additive Manufacturing: Qualification and Certification
Physics-based Qualification for Laser Powder Bed Fusion AM
Pore Formation in Laser Powder Bed Fusion Inconel 718 through Multiphysics Modeling
Post-build Heat Treatment of Wire-arc Additive Manufactured 410 SS for Hardness Tuning
Recyclability of Ti-6Al-4V Powders Used in Additive Manufacturing
Reducing Anisotropic Deformation of LPBF Inconel 718 for Applications in Extreme Conditions
Reducing Heat Buildup and Regularizing Melt Pool Dimensions in Laser Powder Bed Fusion through a “Powder Moat” Scan Strategy
Similarity Analysis and Clustering of Thermal History to Understand Process-structure Relationships
Simulation of the Effect of Texture on Anisotropy in SLM-Produced IN718 Microstructures
The Effects of Powder Particle Size Distribution on the Powder and Part Performance of Laser Powder Bed Fusion 17-4 PH Stainless Steel
Unveiling the Relationships between Powder Bed Conditions and Materials Quality during Selective Laser Melting

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