| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Refractory Metals 2023
|
| Presentation Title |
Insights on the Fatigue Crack Growth Behaviour of Rolled Tungsten for Its Application in Nuclear Fusion |
| Author(s) |
Michael Pegritz, Stefan Wurster, Reinhard Pippan, Anton Hohenwarter |
| On-Site Speaker (Planned) |
Michael Pegritz |
| Abstract Scope |
High heat flux materials in novel fusion reactors such as ITER or DEMO are exposed to remarkable cyclic thermal stresses. Therefore, knowledge of the fatigue properties in the fusion relevant temperature window is mandatory for the save operation and for lifetime calculations of structural components. Surprisingly, the fatigue crack growth behaviour of tungsten is barely investigated. This work provides first insights into the fatigue crack growth behaviour of rolled tungsten with ITER specification near the ductile to brittle transition temperature (DBTT) regime in high vacuum. A study on the temperature dependence of the crack growth behaviour above DBTT showed brittle fracture surface features to play a significant role up to 400°C. Therefore, different microstructures and respective crack orientations as well as different load ratios were investigated at 500°C. While a typical fatigue fracture surface for bcc-metals was observed at low load ratios, delamination-controlled fracture sets in for high load ratios. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Mechanical Properties, Other, Other |