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Meeting Materials Science & Technology 2020
Symposium Additive Manufacturing: Qualification and Certification
Presentation Title Reducing Heat Buildup and Regularizing Melt Pool Dimensions in Laser Powder Bed Fusion through a “Powder Moat” Scan Strategy
Author(s) Evan P. Diewald, Christian Gobert, Nicholas Jones, Jack Beuth
On-Site Speaker (Planned) Jack Beuth
Abstract Scope The stochastic nature of the laser powder bed fusion (LPBF) process results in undesired defects such as porosity, residual stress, and inconsistent microstructure. Many flaws are related to erratic thermal conditions caused, in part, by suboptimal infill scanning strategies. This article presents an approach for reducing heat buildup in metals additive manufacturing (AM) that can be implemented within the bounds of most commercial machines. The “Powder Moat” strategy, where a thin wall is built outside the boundaries of the intended part, eliminates in-plane hotspots by inducing a predictable delay after each raster. A semi-analytical model is used to generate process maps of delay times and moat thicknesses as a function of laser power and velocity, and the approach is validated through high speed imaging. By standardizing melt pool dimensions and thermal distributions, the strategy serves the broad goal of process qualification and is a practical step toward increasing AM’s reliability.
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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