| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advancing Current and State-of-the-Art Application of Ni- and Co-based Superalloys
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| Presentation Title |
Optimising the γ/γ' Microstructure and Increasing the High Temperature Strength of a Co-base Superalloy |
| Author(s) |
Daniel Hausmann, Cecilia Solís, Lisa Freund, Andre Heinemann, Mathias Göken, Ralph Gilles, Steffen Neumeier |
| On-Site Speaker (Planned) |
Daniel Hausmann |
| Abstract Scope |
The newly developed polycrystalline Co-base-superalloy CoWAlloy2 provides a high potential for application as wrought alloy due to the large gap between solidus and γ'-solvus temperature along with a high γ'-volume fraction. The scope of this study was the improvement of the high temperature strength by optimizing the γ/γ'-microstructure and adjusting different annealing steps.
The microstructure and mechanical properties were investigated by SEM, compression and hardness tests. In-situ high temperature SANS helped to understand the microstructural evolution during heat treatment. The size of γ'-particles increases with increasing annealing time and temperature of the first annealing step. As a result, the hardness of the alloy increases until a maximum after 4 h annealing is reached. The reason is an optimum γ'-particle size, which can be explained by the weak and strong pair-coupling model of dislocations. A second annealing step leads to a further increase of yield strength due to an increasing γ'-fraction. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |