| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advancing Current and State-of-the-Art Application of Ni- and Co-based Superalloys
|
| Presentation Title |
On the Formation of Heating and Cooling Precipitates from a Superalloy Powder |
| Author(s) |
David M. Collins, Neil D'Souza, Chinnapat Panwisawas, Paraskevas Kontis |
| On-Site Speaker (Planned) |
David M. Collins |
| Abstract Scope |
Contemporary powder-based polycrystalline nickel-base superalloys inherit microstructures and properties that are heavily determined by the initial condition of the powder particles. A combination of atom probe tomography and in-situ neutron diffraction was used to study the formation of gamma-prime precipitates during different thermal cycles. The behaviour was assessed from powder comprising single-phase supersaturated gamma only, then tracking the gamma-prime volume fraction and lattice misfit evolution. Subsolvus heat treatments yielded a unimodal gamma-prime distribution, formed during heating, with evidence to suggest these had formed via spinodal decomposition. A supersolvus heat treatment led to the formation of this same gamma-prime population during heating, but dissolves as the temperature increases further. The gamma-prime then reprecipitates as a multimodal population during cooling. Atom probe characterisation provided intriguing precipitate characteristics, including clear differences in morphology, size distribution and chemistry, depending on whether the gamma-prime formed during heating or cooling. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |