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Meeting Materials Science & Technology 2020
Symposium Additive Manufacturing of Metals: Complex Microstructures and Architecture Design
Presentation Title Microstructure of Alloy 247LC Manufactured by Laser Powder Bed Fusion
Author(s) Olutayo Adegoke, Joel Andersson, Robert Pederson, Håkan Brodin
On-Site Speaker (Planned) Olutayo Adegoke
Abstract Scope Alloy 247LC is a γ’ precipitation strengthening nickel-based superalloy which displays cracks during laser powder bed fusion (L-PBF). More research is needed for increasing the understanding of the microstructure in order to solve this problem. This study presents the influence of process parameters on the microstructure and defects in L-PBF manufactured Alloy 247LC. High energy density, for example high laser power, low scanning speed and low hatch distance, produced high crack density. Low energy density produced high void content. High resolution scanning electron microscopy (SEM) of as-built samples displayed cell structures of approximately 400 nm. These cell structures have bright microconstituents containing mainly Hf and Ta in between the boundaries. γ’ was not observed in the as-built condition but may be present due to the relatively high hardness obtained. After hot isostatic pressing (HIP) the cracks were closed and relatively large γ’ was revealed. The γ’ reduced in size and displayed adequate hardening after solution heat treatment and ageing.


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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