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Meeting Materials Science & Technology 2020
Symposium Additive Manufacturing of Metals: Complex Microstructures and Architecture Design
Presentation Title Mitigating Stray Grain Nucleation during the Laser Powder Bed Fusion of Single Crystal CMSX-4
Author(s) Joseph W. Aroh, Amir Mostafaei, Joseph Pauza, Runbo Jiang, Jerard Gordon, Anthony Rollett
On-Site Speaker (Planned) Joseph W. Aroh
Abstract Scope Despite the rapid, nonequilibrium solidification conditions in Laser Powder Bed Fusion processing, the as-built microstructure is typically dominated by epitaxial grain growth which continues across many successive build layers/melt pool boundaries. In this work, we investigated the effects that laser processing parameters have on maintaining epitaxial growth and mitigating stray grains within a melt track on single crystal CMSX-4. Observations from electron backscatter diffraction, scanning electron microscopy, and synchrotron high energy diffraction microscopy experiments inform how the degree of epitaxy is affected in each condition. Each experiment was performed on both bare plate and with various Ni-alloy powder layers to see how powder might further promote nucleation sites. Further validation of this work included using classical nucleation theory coupled with thermal modeling to predict where nucleation has the highest probability to occur as a function of melt pool position.


Additive Manufacturing of Pure Magnesium
Alloy and Process Modification for Microstructure Control in Additively Manufactured Alloys
Application of Photodiode Sensor for Contour Extraction of Part Features in the Laser Powder Bed Fusion Process
Control of Nanoscale Lamellae in Bulk Al-Cu Eutectic Samples Through Laser Powder Bed Fusion
Cracking in Additively Manufactured Refractory Metals
Engineering the Plasticity of SLM Steel via Crystallographic Texture Control
Evaluation of Microstructure in Multi Bead Ti-6Al-4V
Fabrication of High Temperature High Strength Austenitic Steels by Laser Powder-bed Fusion
Laser Powder Bed Fusion of Single-crystalline-like Stainless Steel 316L; From Samples to Parts
Microstructural Features and Mechanical Properties of a Newly Designed Steel Fabricated by Laser Powder Bed Fusion
Microstructure of Alloy 247LC Manufactured by Laser Powder Bed Fusion
Mitigating Stray Grain Nucleation during the Laser Powder Bed Fusion of Single Crystal CMSX-4
Modeling of Grain Growth in Metal Printing
Secondary Orientation Preference of Ni-based Superalloy Single Crystals Produced via Electron Beam Melting
Synchrotron X-ray Studies on Additive Manufacturing and Materials
The Structure of Cellular Features in Additively Manufactured 316L

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