Abstract
During service of a gas turbine engine, components may suffer instant overheating which is a concern to safe operations. Effect of short overheating on the tensile properties of a Ni-based superalloy Waspaloy has been studied due to its significant importance for practical applications. The results have shown that a combination of near supersolvus overheating at 1000 °C with very rapid cooling at a rate of 50 K/s is most detrimental case to the tensile properties of the material. This is attributed to the absence of γ' and carbide re-precipitation and growth during cooling period. Microstructure change during overheating and cooling has been deduced using in-situ resistivity measurements. This work provides evidence that multilateral measurements including resistivity can shed light on the failure controlling parameters.
| Original language | English |
|---|---|
| Article number | 110911 |
| Number of pages | 11 |
| Journal | Materials and Design |
| Volume | 221 |
| Early online date | 2 Jul 2022 |
| DOIs | |
| Publication status | Published - Sept 2022 |
Bibliographical note
Acknowledgments:Authors acknowledges financial support from Hitachi Metals - University of Oxford UTC (University Technology Centre). Dr. Joseph Ghoussoub (formerly at Department of Materials, University of Oxford) and Andrew Pearce (Instron) are acknowledged for their technical assistance in the experiments. Prof. Graham McCartney (Department of Materials, University of Oxford) is gratefully acknowledged for suggestions.
Keywords
- Waspaloy
- Overheating
- Heat treatment
- Electro-thermal mechanical testing (ETMT)
- system
- Miniature tensile test
- Superalloy