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Meeting Materials Science & Technology 2020
Symposium Phase Transformations in Additively Manufactured Materials
Presentation Title Laser Powder Bed Fusion of Stainless Steel 15-5PH: Microstructure Analysis and Process Optimization
Author(s) Cameron Lucas, Nathalia Diaz Vallejo, Holden Hyer, Brandon McWilliams, Kyu C Cho, Yongho Sohn
On-Site Speaker (Planned) Cameron Lucas
Abstract Scope Microstructure development in 15-5PH stainless steel was investigated over a wide range of laser bed fusion (LPBF) processing parameters (e.g., laser power, scan speed, and hatch spacing) that were independently varied on the SLM 125HL. The starting powders, sourced from SLM Solutions (Lubeck, Germany), had a size distribution of D10 = 22 um; D50 = 36 um; D90 = 50 um, and composition of (in wt.%) 18.24Cr–4.35Ni–4.31Cu–0.86Si-Fe. Use of energy density between 58 and 278 J/mm3 produced nearly fully dense (≥ 99.9 %) 15-5PH, including the SLM recommended parameter set: power = 200 W; scan speed = 800 mm/sec; hatch spacing = 0.12; slice thickness = 0.03; energy density = 69 J/mm3). Microstructure analysis, including quantification of melt pools and cellular structure within melt pools, were coupled with the Rosenthal equation to understand the LPBF process in terms of cooling and solidification rates.


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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