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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Additive Manufacturing of Large-scale Metallic Components
Presentation Title The Effects of CoAl2O4 on the Microstructural Evolution of Inconel 718 Processed by Direct Energy Deposition
Author(s) Dhruv Tiparti, I-ting Ho, Tilo Buergel, Fred Carter, Sammy Tin
On-Site Speaker (Planned) Dhruv Tiparti
Abstract Scope Processing of Inconel 718(IN718) mixed with CoAl2O4 grain refiners via direct energy deposition (DED) has revealed some unintended microstructural modification effects. The physical presence of these oxides within the melt pool suggests a decrease in convective heat transfer due to increased fluid viscosity induced by a nano/micro particle slag. This decrease in convective flow is accompanied by increased melt pool penetration depth which has consequences of earlier onset of large columnar grains extending across multiple layers. Due to the low and heterogeneous distribution of strain energy within DED processed material; recrystallization kinetics are hindered by a potent Zenner pinning effect that leads to retention of the as-built microstructure even following aggressive heat treatment of 1200 oC up to 4 Hrs. The minor addition of oxide particles shows potential avenues for increased microstructural control of additive materials. Further detail of the results and accompanying discussion will be presented.
Proceedings Inclusion? Planned:
Keywords Additive Manufacturing, High-Temperature Materials, Characterization


A Comparative Study between the Laser Metal Deposition and Selective Laser Melting of AlxCoCrFeNi MPEA
A High Fidelity Melt Pool Dynamics Model with Experimental Validation Results under Various Laser Power Densities and Scanning Speeds
An Investigation on the Capabilities of Laser Directed Energy Deposition Additive Manufacturing Process in Building Challenging Materials and Geometries
Assessment of Hybrid Additive Manufacturing Concept for Production of Parts for Space Applications
Characterization of a Large-scale 316L Body Produced with High Deposition Rate Wire Arc Directed Energy Deposition
Constitutive Modeling of Additively Manufactured Multi-phase Steel Alloys by the Crystal Plasticity Finite Element Method
Correlating Microstructure with Thermal Models in Wire-arc Additive Manufacturing of Mild Steel
Design for Metal Large-scale Additive Manufacturing: Mitigation of Bending Deformation on Curved Sheet
Experimental and Numerical Assessment of H13 Tool Steel Produced by Directed Energy Deposition
Formation of Multiple Necks in Wire-based Electron Beam Additively Manufactured Ti-6Al-4V Pulled in Uniaxial Tension
Heat Treatment Effects on Mechanical Properties of Wire Arc Additive Manufactured and Electron Beam Additive Manufactured Ti-6Al-4V
J-20: Modelling and Analysis of Single-pass Laser Cladded High Speed Steel Considering Phase Transformation Effects
J-21: Numerical Modeling of Non-equilibrium Partitioning in Copper-iron Binary Systems Manufactured by Direct Metal Deposition (DMD)
J-22: Repair of High Hard Steel Using Similar Filler Material by a Solid-state Additive Manufacturing Approach
Large Metal Structures with Wire Arc Additive Manufacturing- Case Studies with Invar Tooling and AM718 Structural Parts
Mechanical Response of Wire-arc Additively Manufactured LA100TM with and without Post-print Heat-treatments
Microstructure Control in Wire-arc Additively Manufactured Maraging Steels
Modified Inherent Strain Method for Wire Arc Additive Manufacturing
NOW ON-DEMAND ONLY - A Comparative Study of Deformation Mechanisms in 316L Stainless Steel Fabricated by Additive and Additive + Subtractive (Hybrid) Manufacturing
NOW ON-DEMAND ONLY - Process Optimization in Metal Additive Manufacturing Using Image Processing and Statistical Analysis
NOW ON-DEMAND ONLY - The Effect of Preheating Substrate on the Microstructure and Mechanical Properties in Laser Deposited Martensitic Steel
Prediction of Large Domain Thermal History and Molten Pool Shape Using the Surrogate Modeling and Machine Learning
Prior-β Grain Structure Control of Ti-6Al-4V WAAM in the As-deposited Condition
Process-structure-property Study on CP-Ti (Grade 2) Produced via High Deposition AM Laser-hot Wire
Rapid Low-temperature Bend-forming of Hierarchical Reticulated Structures
Residual Stress, Microstructure and Characterization of Self-mated Repair of Inconel 718 Using Cold Spray Process
Reverse Engineering of Aerospace Components Utilizing Additive Manufacturing Technology
The Effects of CoAl2O4 on the Microstructural Evolution of Inconel 718 Processed by Direct Energy Deposition
Wire Arc Additive Manufacturing of Nano-treated High Strength Aluminum Alloys
Wire Arc Additive Manufacturing of Stainless Steels: Kinetics Modeling of Phase Transformations Using Differential Scanning Calorimetry
Wire Arc Processing of Stainless Steels; Microstructure and Properties

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