About this Abstract |
| Meeting |
11th International Symposium on Superalloy 718 and Derivatives 2026: Legacy, Innovations, and Future Directions
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| Symposium
|
Superalloy 718 and Derivatives 2026: Legacy, Innovations, and Future Directions
|
| Presentation Title |
Mapping of Process Parameters to Microstructure of Haynes 282 Produced by Laser Wire Directed Energy Deposition |
| Author(s) |
Dennis Gilbert, Andrew Wessman |
| On-Site Speaker (Planned) |
Dennis Gilbert |
| Abstract Scope |
The goal of this study is to correlate the microstructural differences of Haynes 282 to process parameter variation in laser wire directed energy deposition (LWDED). The different process parameters that are being investigated are deposition speed, laser power, wire feed rate, and wire preheat. These four parameters are used to create a designed experiment of 72 unique process parameters. Those parameters are then down selected using single tracks deposition and optical microscopy to check for track continuity and stability. The 8 most ideal tracks were selected to be printed as cube specimens. These cube specimens are then sectioned and evaluated in the as-built condition and with solution heat treatment at 3 different temperatures, the Haynes International standard wrought heat treatment temperature 1150°C, 1250°C informed by Christofidou et. al for complete recrystallization of laser powder bed fusion Haynes 282 and an intermediate temperature of 1200°C. To evaluate grain and precipitate microstructural features high resolution scanning electron microscopy in conjunction with electron backscatter diffraction (EBSD) and energy dispersive spectroscopy (EDS) are being employed. Using these techniques the goal is to find the correlation between energy density, metallurgical structure and productivity. Early work shows a highly anisotropic microstructure containing long columnar grains along the build direction with a long axis roughly the diameter of the wire. These columnar grains are interrupted by a band of small equiaxed grains. Additional work on this may include mapping microstructure to mechanical properties such as tensile or creep strength. |
| Proceedings Inclusion? |
Definite: At-meeting proceedings |