About this Abstract |
| Meeting |
11th International Symposium on Superalloy 718 and Derivatives 2026: Legacy, Innovations, and Future Directions
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| Symposium
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Superalloy 718 and Derivatives 2026: Legacy, Innovations, and Future Directions
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| Presentation Title |
The Influence of Shielding Gas on the Wire-Arc Additive Manufacturing (WAAM) of Ni-Based Superalloy Haynes 282 |
| Author(s) |
Benjamin Adam, Carla Colon Cruz, Rui Feng, Robert Turpin, Shane Namie, Dustin Crandall, Graham Tewksbury, Chantal Sudbrack |
| On-Site Speaker (Planned) |
Benjamin Adam |
| Abstract Scope |
Wire-arc additive manufacturing (WAAM) enables building large near-net-shaped parts using fast deposition rates and is attractive due to the potential cost and schedule savings. Haynes® 282® is a versatile Ni-based superalloy, suitable for various applications in advanced power generation systems due to a good balance between corrosion resistance, high temperature mechanical properties, and processability. In a preceding process optimization study using base Ar-30He gas, the processing-structure-properties relationships have been characterized over a wide range of wire feed and travel speeds, resulting in the determination of optimum processing window. However, to avoid costly and complex post-process treatments like HIP - addressing as-built defects such as gas porosity and lack of fusion - requires a more complete understanding of the shielding gas influence. Thus, in this study, we systemically explored effects of additions of 0.25-3% of H2 and CO2 gases additions to base shielding gas. Single and multi-bead depositions were used to screen 20+ gas combinations to examine impact on wetting behavior, porosity, oxidation, deposition heterogeneity and variability in grain structures, leading to the down-selection of two gas mixes for sub-sized wall builds. Four different process parameter combinations were compared in these builds to examine differences in microstructure and defect distribution as function of shielding gas composition, using a multi-characterization approach including optical microcopy, CT, SEM-EDS, and EBSD. The findings suggest that gas variations did not significantly affect solidification or compositional segregation behavior but yields complex changes in porosity, penetration depth and wetting of as-built blocks. |
| Proceedings Inclusion? |
Definite: At-meeting proceedings |