| 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 |
On the Rejuvenation of Crept Ni-base Single Crystal Superalloys (SX) by Hot Isostatic Pressing (HIP) |
| Author(s) |
Oliver M. Horst, Benjamin Ruttert, David Bürger, Larissa Heep, Hongcai Wang, Antonín Dlouhý, Werner Theisen, Gunther Eggeler |
| On-Site Speaker (Planned) |
Oliver M. Horst |
| Abstract Scope |
In the present study, the effect of HIP-rejuvenation treatments on the creep behavior and residual life of a pre-crept single crystal Ni-base superalloy of type CMSX-4 is investigated. Miniature creep experiments of precisely oriented [001] tensile creep specimens with HIP treatments and quantitative analysis of scanning and transmission electron micrographs are combined. A HIP-rejuvenation treatment after 5.0% creep pre-strain significantly improves creep strength. However, the microstructural damage induced by the creep pre-deformation could not be fully removed. In a series of sequential creep/HIP/creep-experiments, increasing levels of pre-deformation result in increasing levels of creep rates even after identical HIP-rejuvenation treatments. The memory effect, which causes this phenomenon, is related to an accumulation of permanent microstructural damage, which is not associated with rafting or cavitation. The mechanical results obtained in the present work are interpreted based on microstructural results, the pore population and dislocation substructures, which have formed during creep. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |