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Meeting Materials Science & Technology 2020
Symposium Phase Transformations in Additively Manufactured Materials
Presentation Title Process Optimization and Microstructure Analysis to Understand Laser Powder Bed Fusion of Stainless Steel 316L
Author(s) Nathalia Diaz Vallejo, Cameron Lucas, Nicolas Ayers, Holden Hyer, Brandon McWilliams, Kyu C Cho, Yongho Sohn
On-Site Speaker (Planned) Nathalia Diaz Vallejo
Abstract Scope Microstructural development and mechanical behavior of 316L stainless steel was investigated over a wide range of laser powder bed fusion (LPBF) parameters (laser power, scan speed, hatch spacing, and slice thickness). The starting powder had a size distribution of D10 = 22 um; D50 = 36 um; D90 = 50 um. SLM 125HL was employed for LPBF. Use of energy density between 46 and 127 J/mm3 produced nearly fully dense (≥ 99.8 %) samples, and this included the best parameter set: power = 200 W; scan speed = 800 mm/sec; hatch spacing = 0.12 mm; slice thickness = 0.03; energy density = 69 J/mm3). Microstructural features including melt pool and cellular structure were quantified to better understand the LPBF process. Using the optimized LPBF parameters aforementioned, the as-built 316L had, on average, yield strength of 572 MPa, tensile strength of 710 MPa and 48% strain at failure.


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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