Abstract
Owing to the large amount of installation of renewable energy sources, which introduce large output fluctuations, the load-following operation will be mandatory in fossil power plants including coal-fired power plants. In cases where the load-following operation becomes the main mode, it is assumed that the start/stop frequency and the output adjustment for a short period are increased, and therefore, it is thought that the fatigue damage becomes more distinct. In this study, to clarify the oxidation behavior and its correlation with the crack growth behavior in aged CrMo cast steel, crack growth tests were performed in dry air and in superheated steam at 600°C using the newly developed clip gauge which can be used in both these environments. Crack growth rates were examined using a compact tension specimen under cyclic loading and compared in terms of the J-integral range, ΔJ. The crack growth rate in the steam environment was slightly lower than that obtained in the air environment. Formation of voids was significant in the oxide formed in the crack propagated in the dry air environment. It was thought that the change in strength and adhesiveness of the oxide affects environmental fatigue crack growth in addition to its thickness.
| Original language | English |
|---|---|
| Pages | 1101-1105 |
| Number of pages | 5 |
| Publication status | Published - 2020 |
| Event | 7th International Conference on Power Engineering, ICOPE 2019 - Kunming, China Duration: 2019 Oct 21 → 2019 Oct 25 |
Conference
| Conference | 7th International Conference on Power Engineering, ICOPE 2019 |
|---|---|
| Country/Territory | China |
| City | Kunming |
| Period | 19/10/21 → 19/10/25 |
Keywords
- Crack growth
- Fatigue
- Steam oxidation
- Steam turbine
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Fuel Technology
- Energy Engineering and Power Technology
