| 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 |
Optimising Creep Resistance of a Powder Metallurgy Nickel Superalloy via Tailoring of γ΄ Precipitates Using Different Heat Treatments |
| Author(s) |
Chrysanthi Papadaki, Wei Li, Alexander M. Korsunsky |
| On-Site Speaker (Planned) |
Chrysanthi Papadaki |
| Abstract Scope |
A series of advanced experimental techniques have been used to examine the morphological, compositional and structural characteristics of the intergranular and intragranular secondary and tertiary γ’ precipitates as a function of the cooling rate after solution heat treatment, in a high gamma prime content powder metallurgy (P/M) nickel superalloy, Alloy 11. First, a power law dependence of the γ′ precipitate size on the cooling rate was observed experimentally, and then validated and explained by a model developed on the basis of McLean’s theory of precipitate growth. Next, high-resolution scanning and transmission electron microscopy techniques combined with energy-dispersive X-ray spectroscopy (STEM-EDX analysis) for elemental mapping of the γ′ precipitates in the nanoscale were employed to obtain insights into local variations between different populations of gamma prime precipitates formed at different cooling regimes. Eventually, a link with creep resistance was established, by performing interrupted creep tests and subsequent microstructural examination. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |