|About this Abstract
||Materials Science & Technology 2019
||Additive Manufacturing of Metals: Microstructure and Material Properties of Nickel-based Alloys
||Developing Processing Parameters for Epitaxial Growth in Single Crystal CMSX-4 Single Beads via Laser Powder Bed Fusion
||Amir Mostafaei, Joseph Pauza, Anthony D Rollett
|On-Site Speaker (Planned)
Scanning laser epitaxy (SLE), also known as a laser powder bed fusion (LPBF), uses a high-power laser to consolidate powdered materials and fabricate 3D parts. Here, we develop a processing window for laser power (ranging from 200-350 W) and scanning speed (ranging from 0.4-1.2 m/s) to study the melt pool shape and resulted epitaxial growth patterns in the re-melted region. Experiments are carried out on a single crystal nickel-based superalloy CMSX-4 substrate. Microscopy observations including scanning electron microscopy and electron backscatter diffraction analysis are applied to both cross and longitudinal sections. The results show that the melt pool size and shape as well as degree of epitaxy are affected by the processing parameters. The aim is to create textured microstructures that approach single crystals via epitaxial growth. Experimental results are compared with Monte Carlo simulations of rapid solidification during the fabrication process.
||Planned: At-meeting proceedings