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Meeting Materials Science & Technology 2020
Symposium Additive Manufacturing: Qualification and Certification
Presentation Title Physics-based Qualification for Laser Powder Bed Fusion AM
Author(s) Anthony D. Rollett
On-Site Speaker (Planned) Anthony D. Rollett
Abstract Scope A multi-institution team is investigating a physics-based approach to qualification of laser powder bed fusion (LPBF) machines. By printing Ti-6Al-4V under a variety of conditions of power, speed and hatch spacing, the dependence of porosity and fatigue strength is quantified. The same model of LPBF machine is used at different institutions, along with other makes. Process windows are defined by keyhole porosity on the high power side and lack-of-fusion porosity on the high speed side. 4-point bend fatigue provides an efficient method for quantifying variations in fatigue. Amongst many other factors, controlling raster length is crucial for avoiding defects. A related effort in wire-feed robotic welding of scandium-modified Al alloys also leads to a process window in P-V space bounded by a limit on porosity that provides an analogous basis for qualification. Contributions from the many team members and support from the NASA ULI Program are gratefully acknowledged.
Proceedings Inclusion? Undecided


A Comprehensive Digital Platform for Additive Manufacturing
A Multi-Sensor Comparative Study for Fatigue Prognosis of Additively Manufactured Metallic Specimens
Connecting Metal Powder Morphological Characteristics with Flowability Properties Using Machine Learning
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
Ensuring Build Quality thru Physics-based Support Design Optimization for Residual Stress
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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