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Meeting 2016 TMS Annual Meeting & Exhibition
Symposium Additive Forming of Components - Tailoring Specific Material Properties in Low Volume Production
Presentation Title Prediction of Porosity Caused by Insufficient Melt Pool Overlap
Author(s) , Ming Tang
On-Site Speaker (Planned)
Abstract Scope Porosity of additively manufactured components can strongly affect mechanical properties (including static and fatigue strength, and ductility). We present a geometrical model predicting porosity caused by insufficient overlap of melt pools; the model is applicable to both electron-beam and selective laser melting processes, with elliptical melt-pool cross-sections. Comparison with reported part porosity from the literature shows good agreement with the calculated volume fraction of unmelted material, for several different materials. It is found that the unmelted volume fraction does not depend on the angle of rotation between the scanning direction of successive layers, provided that the linear offset between scans is randomized. For AlSi10Mg builds with EOS selective laser melting – using process conditions close to the recommended defaults – other causes of porosity include entrapped gas and poor wetting of large (5-20 micron) oxide inclusions. Keyholing porosity does not occur for build conditions in the vicinity of the defaults.
Proceedings Inclusion? Planned: A print-only volume


A Roadmap for Developing the Next Generation of Additive Manufacturing Materials
Additive Friction Stir Deposition of Functionally Gradient Al-Fe Composite
Additive Manufacturing from the Gaseous State
Additive Manufacturing of Metals: The Devil in the Details
Anisotropic Mechanical Properties in a Big-sized Ti-6Al-4V Plate Fabricated by Electron Beam Melting
Challenges in Using AM Components in Industrial Applications
Characterization of Microstructure and Mechanical Properties of Direct Metal Laser Sintered 15-5 PH1 Stainless Steel Powders and Components
Constitutive Modeling and Experimental Verification of Aqueous–based Freeform Extrusion Fabrication Processes
Controlling Microstructure of IN738LC Superalloy during Selective Laser Melting (SLM) Process
Correlating Microstructure with Processing in Gradient Alloys Fabricated through Laser Deposition
Customisation of Metal Powders for Additive Manufacturing Applications: the Tekna Process
Developing 3D Printed Heat Exchangers
Direct Writing of Nickel Super Alloy(N5) Single Crystal
Effect of Heat Treatment on the Microstructure, Texture and Elastic Anisotropy of a Nickel-based Superalloy Processed by Direct Laser Deposition
Effects of Microstructure on the Mechanical Properties of Direct Laser Deposited Ti-6Al-4V
Evaluation of Phase Transformation Kinetics in 17-4 Stainless Steel Manufactured by Direct Metal Laser Sintering
Fabrication and Property Development for a Functionally Graded Austenitic to Maraging Stainless Steel Component
Flexible Heat Treatment of AM Material in a HIP
ICME Approach to the Materials Challenges in Additive Manufacturing of Components
Lightweight, Strong and Ductile Hierarchical Architected Materials Fabricated from Additive Manufacturing
Microstructural and Mechanical Properties of γ-Titanium Aluminide Manufactured by Electron Beam Melting
Microstructural Characterization and Process Mapping in Beam-Based Additive Manufacturing of Inconel 625
Microstructural Evolution of Inconel 625 Manufactured through Direct Metal Laser Sintering Technique of Additive Manufacturing
Microstructure and Mechanical Characterization of Hybrid Materials Fabricated Using Ultrasonic Additive Manufacturing
Microstructure and Mechanical Properties of a Complex Industrial Component: a Case Study of Electron Beam Melting Additive Manufactured Ti-6Al-4V Impeller
Microstructure Evolution, Tensile and Dynamic Properties, and Computational Modeling in Ti-6Al-4V and Inconel 718 Alloys Manufactured by Laser Engineered Net Shaping
Multimodal Correlated Datasets to Understand Location Specific Processing State for Additive Manufacturing
New Alloy Systems for Direct Metal Powderbed Processes
Optimization of the Mechanical Properties of the Ti-6Al-4V Alloy Fabricated By Additive Manufacturing Using Thermochemical Processes
Powder-bed Fabrication of the High-temperature Ni-base Superalloy LSHR
Precipitation Reactions Occurring during Laser Additive Manufacturing of Alloys
Prediction of Porosity Caused by Insufficient Melt Pool Overlap
Rationalization of Advanced Site-specific Microstructure Control within Additive Manufactured Components
Reliability-Based Methods for Rapid Certification of Metal Additive Manufactured Parts
Residual Stress Determination of Additively Manufactured Inconel 718 Specimens
Simulation and Modeling of the Metal Laser Powder Bed Fusion Process to Accelerate Certification
Tailoring Titanium Alloy Compositions for Optimum Additive Manufacturing

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