| About this Abstract |
| 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. |