About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
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| Symposium
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Emergent Materials Under Extremes and Decisive In Situ Characterizations
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| Presentation Title |
In-Situ Neutron Diffraction-Based Creep Evaluation of Co- and Ni-Based Superalloys Produced by Laser Powder Bed Fusion |
| Author(s) |
Noah Holtham, Patxi Fernandez-Zelaia, Frank Brinkley, Christopher Fancher, Christopher Ledford, Ning Zhou, Stéphane Forsik, Tresa Pollock, Michael Kirka |
| On-Site Speaker (Planned) |
Noah Holtham |
| Abstract Scope |
In this work, recently developed high γ’ alloys designed for laser powder bed fusion (LPBF) processing, GammaPrint®-700 (Co-based) and GammaPrint®-1100 (Ni-based), were subjected to creep testing while being continuously monitored via the VULCAN instrument at the ORNL Spallation Neutron Source to measure the phase-specific strain behavior and deformation mechanisms in-situ. Specimens from both alloy systems were subjected to thermomechanical loads of 760 °C/500 MPa and 900 °C/175 MPa for 10 hours or until rupture. Diffraction data showed that the ordered γ’ phase accommodated most of the tensile strain while the surrounding γ matrix compressed due to the lattice parameter and stiffness mismatch. SEM, EDS, and EBSD analysis revealed small differences in phase fraction, texture, solute partitioning which were determined to be minor contributors to the creep behavior. The in-situ creep testing of GammaPrint®-700 and GammaPrint®-1100 alloys demonstrates the significant potential of LPBF-optimized Co–Ni superalloys in high temperature applications. |