| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing and Alloy Design: Bridging Fundamental Physical Metallurgy, Advanced Characterization Techniques, and Integrated Computational Materials Engineering for Advanced Materials
|
| Presentation Title |
Precipitation Reactions in Supersaturated Nickel-Based Superalloys: A Multi-Length-Scale Study |
| Author(s) |
Yuanbo Tang |
| On-Site Speaker (Planned) |
Yuanbo Tang |
| Abstract Scope |
A supersaturated gamma phase microstructure is produced in Ni-based superalloys using laser powder bed fusion (L-PBF) – the cooling rate arising from the process can suppress the solid-state precipitation of the gamma prime phase. We interrogated two new nickel-based superalloys made this way, both in situ and ex situ, at multiple length scales using advanced characterisation methods. First, we conducted in situ synchrotron X-ray diffraction during various heat treatments to trace the evolution of the gamma prime volume fraction with temperature. The first structural changes were detected at an unexpectedly low temperature of 445 °C. Second, the temperature for gamma prime nucleation and its sensitivity to heating rate was studied using an electrical resistivity method. Finally, the composition upon heating, isothermal holding and cooling is analysed using atom probe tomography, the result is rationalised by further scanning-transmission electron microscopy and nanoscale secondary ion mass spectroscopy. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Phase Transformations |