For higher efficiency and competitive overall performance, it would be an advantage to be able to safely exceed the highest operational values, currently up to about 600-620°C/25-30 MPa in supercritical (SC) boiler plants. Under such operating conditions the oxidation resistance in SC water tends to limit the potential for further improvement of efficiency. The way to increase the oxidation resistance of traditional austenitic boiler tubes e.g. TP 347H is to do additional cold work on the boiler tube inner surface. In the current paper the effect of cold work on the oxidation resistance of TP347H and TP347HFG has been evaluated by shot peened samples with different parameters and subjecting those samples to supercritical oxidation exposure. The results show an improvement in the oxidation resistance of the alloys, especially in the large grained alloy TP347H. Also the uniformity of the deformation layer was seen to have an influence on the oxidation resistance, since the oxide nodules start to grow at locations with the thinnest or no deformation layer.
|Title of host publication||Advances in Materials Technology for Fossil Power Plants, Proceedings from the Eighth International Conference (EPRI 2016)|
|ISBN (Print)||978-162-70813-1-3, 162-70813-1-3|
|Publication status||Published - 2016|
|MoE publication type||A4 Article in a conference publication|
|Event||8th International Conference on Advances in Materials Technology for Fossil Power Plants - Algarve, Portugal|
Duration: 10 Oct 2016 → 14 Oct 2016
|Conference||8th International Conference on Advances in Materials Technology for Fossil Power Plants|
|Period||10/10/16 → 14/10/16|
- boiler tube material
- shot peening
- steam oxidation
- surface treatment
Yli-Olli, S., Tuurna, S., Auerkari, P., & Penttilä, S. (2016). Evaluating the effect of cold work on supercritical oxidation of boiler tube materials. In Advances in Materials Technology for Fossil Power Plants, Proceedings from the Eighth International Conference (EPRI 2016) (pp. 823-831). ASM International.