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Meeting Materials Science & Technology 2019
Symposium Additive Manufacturing of Metals: Microstructure and Material Properties of Nickel-based Alloys
Presentation Title Toward an Understanding of Cracking, Scan Strategy and Airfoil Geometry in Electron Beam Powder Bed Additive Manufacturing
Author(s) Yousub Lee, Mike Kirka, Ryan Dehoff
On-Site Speaker (Planned) Yousub Lee
Abstract Scope The extension of metal additive manufacturing to non-printable Ni-based superalloy (e.g., Mar-M247 and IN738 alloys) is still a challenging issue in electron beam melting (EBM) process. Rapid precipitation of large volume of γ’, non-homogeneous γ’ distribution and existent of γ/ γ’ eutectic phase makes EBM difficult to print the alloys. Since the design of airfoil is complicated, the corresponding complex thermal signature leads to cracking in the geometries under severe mechanical restraints during printing. This work aims to understand the correlation between cracking, scan strategy and part geometry in an actual airfoil. The crack location was monitored via In-situ near infrared camera (NIR) at various heights of the airfoil. A continuum-scale finite element method (FEM) is used to reveal the cracking mechanism. A new scan strategy is tested using FEM model to avoid the cracks from the part.
Proceedings Inclusion? Planned: At-meeting proceedings

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Combining In-Situ/Ex-Situ Characterization and Solidification Modeling to Understand Microstructure Selection in Additively Manufactured Ni-based Alloys
Corrosion Studies on Inconel 718 Produced by Laser Powder Bed Manufacturing
Creep and Oxidation Performance of Alloy 282 Fabricated by Electron Beam Melting
Crystallographic Characterization of Nickel-based Alloys by Optical Microscopy
Developing Processing Parameters for Epitaxial Growth in Single Crystal CMSX-4 Single Beads via Laser Powder Bed Fusion
Effect of Intra-build Location and Loading Direction on Quasi-static and Dynamic Response of Additively Manufactured Inconel 718
Effect of Part Size on Powder Bed Fusion IN718 Parts
Effect of Post-printing Heat Treatment on the Microstructure, Hardness and Phase Formation in Laser Powder Bed Fusion Inconel 718 Cuboids
Effect of Processing Parameters on Density, Surface Roughness and Mechanical Properties of Hastelloy X Manufactured by Electron Beam Melting
Effects of Laser Processing Parameters and Build Orientation on the Surface Roughness and High-cycle Fatigue Life of Inconel 718 Manufactured Using Laser Powder Bed Fusion
Experimental Characterization and Modeling of Solidification Cracking in Gamma-prime Strengthened Ni-based Superalloys
Fluid Dynamics Effects on Microstructure Prediction for the Single-track Laser Additive Manufacturing Process
High-throughput Characterization of Additively Manufactured Nickel Superalloy 625 Using a Combinatorial Sample to Rapidly Screen Process-Microstructure-Mechanical Property Information
High Temperature Air Oxidation Behavior of Hastelloy X Processed by Electron Beam Melting (EBM) and Selective Laser Melting (SLM).
High Throughput Process Mapping of Metal Additive Manufacturing Applied to Austenitic Stainless Steel and Ni-based Superalloys
Influence of Geometry on Process-Structure-Property Relationships in Electron Beam Melted Ni-based Superalloys
Influence of Pulsing Rate on the Solidification Behaviour and Microstructure in Direct Laser Deposition of IN718
LPBF Production of Inconel 939: Powder Evaluation & Process Parameters Investigation
Microstructural Evolution of IN718 Alloy Manufactured by Selective Laser Melting under Different Stress Conditions
Microstructure and Mechanical Properties Characterization of Crack-free Hastelloy X Fabricated by Laser Powder Bed Fusion
Microstructure Stability of Inconel 718 in the Laser Powder Bed Fusion Process as a Function of Geometrical Features and Process Parameters
Multiscale Characterization of Microstructures and Mechanical Properties of Inconel 718 Fabricated by Selective Laser Melting
Multiscale Modeling Framework for the Selective Laser Melting Process Applied to Inconel 718
Optimization of Heat Treatment Parameters for Additive Manufacturing Hastelloy X
Parametric Study of Microstructure Formation of Quasi-Continuous-Wave Laser Additive Manufactured Inconel 718
Phase Field Model Development for Prediction of Microstructure in IN718 Alloy during Additive Manufacturing and Heat Treatment
Processing Optimization for Additive Manufacturing of Nickel Superalloys
Residual Strain Mapping of Additively Manufactured Inconel 718 Blade
Residual Stress Measurements and Predictions for IN625 SLM Parts
Stress Corrosion Cracking Resistance of Additively Manufactured Nickel Alloy UNS N07718 and UNS N09946 in Chloride-containing Environments
The Creep Behavior of Additively Manufactured Inconel 625
The Effect of Static Magnetic Field on Electron Beam Melting Process of Ti6Al4V
Toward an Understanding of Cracking, Scan Strategy and Airfoil Geometry in Electron Beam Powder Bed Additive Manufacturing
Tribocorroison Behavior of Inconel 718 Fabricated by Laser Powder Bed Fusion based Additive Manufacturing
Wire-arc Additive Manufacturing of Single Crystals

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