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Meeting Materials Science & Technology 2020
Symposium Phase Transformations in Additively Manufactured Materials
Presentation Title Effects of Laser Powder Bed Fusion Parameters and Heat Treatment on Microstructure and Mechanical Behavior of Inconel 718 Alloy
Author(s) Thinh Huynh, Abhishek Mehta, Sharon Park, Holden Hyer, Le Zhou, Devin D Imholte, Nicolas E Woolstenhulme, Daniel M Wachs, Yongho Sohn
On-Site Speaker (Planned) Thinh Huynh
Abstract Scope Excellent weldability and high temperature stability make IN718 one of the most desired alloys to be additively manufactured via laser powder bed fusion (LPBF). In this study, gas-atomized IN718 powders were used to fabricate IN718 samples by LPBF with independently varied laser power (125 - 350W), scan speed (200 - 2200 mm/s), and scan rotation (0 - 90). In general, relative density greater than 99.5% was accomplished using the energy density range of 50-100 J/mm3; furthermore, a larger processing window was observed at higher laser power. Microstructural features including key holes, lack of fusion flaws, melt pool geometry and grain structure were documented and correlated to the LPBF parameters explored. Various heat treatments were carried out to observe the effects of solutionizing on the formation of δ-phase, the γ' and γ" precipitation, and mechanical properties of LPBF IN718 after the two-step aging process.


Design of Post-fabrication Heat Treatments for Ti Free Grade 300 Maraging Steel Manufactured Using Laser Powder Bed Fusion (LBPF) Process
Development of Non-equilibrium Thermodynamic Tools for Additive Manufacturing
Effects of Laser Powder Bed Fusion Parameters and Heat Treatment on Microstructure and Mechanical Behavior of Inconel 718 Alloy
In-situ Characterization of Rapid Phase Evolution of AM Metals with High Energy Synchrotron X-ray Diffraction
Laser Powder Bed Fusion of Grade 300 Maraging Steel for Tooling Applications
Laser Powder Bed Fusion of Stainless Steel 15-5PH: Microstructure Analysis and Process Optimization
Microstructure Engineering through Post-heat Treatment of Inconel 718 Superalloy Made by Laser Powder Bed Fusion
Phase Field Simulations of Cellular-to-Dendritic Transition under Additive Manufacturing Conditions
Process Optimization and Microstructure Analysis to Understand Laser Powder Bed Fusion of Stainless Steel 316L
Rapid Solidification of Aluminium 6061 Using Fast Scanning DSC
Real-time Observation of the Competition between Ferritic vs Austenitic Solidification in Micro-laser Welding of 316L Using Synchrotron X-ray Diffraction
Understanding the Effect of Thermal Gradients on Additively Manufactured (AM) Builds Using In Situ TEM

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