Abstract
Traditional laboratory steam experiments are conducted at ambient pressure with water of variable chemistry. In order to better understand the effect of steam pressure and water chemistry, a new recirculating, controlled chemistry water loop with a 650°C autoclave was constructed. The initial experiments included two different water chemistries at 550° and 650°C. Two 500-h cycles were performed using oxygenated (OT, pH ~9 and ~100 ppb O2) or all-volatile treated (AVT, pH ~9 and <10 ppb O2) water conditions at each temperature. Coupons exposed included Fe-(9-11)%Cr and conventional and advanced austenitic steels as well as shot peened type 304H stainless steel. Compared to ambient steam exposures, the oxides formed after 1,000 h were similar in thickness for each of the alloy classes but appeared to have a different microstructure, particularly for the outer Fe-rich layer. An initial attempt was made to quantify the scale adhesion in the two environments.
| Original language | English |
|---|---|
| Title of host publication | Joint EPRI-123HiMAT International Conference on Advances in High-Temperature Materials - Proceedings from EPRI's 9th International Conference on Advances in Materials Technology for Fossil Power Plants and the 2nd International 123HiMAT Conference on High-Temperature Materials |
| Editors | John Shingledecker, Masao Takeyama |
| Publisher | ASM International |
| Pages | 939-947 |
| Number of pages | 9 |
| ISBN (Electronic) | 9781627082716 |
| DOIs | |
| State | Published - 2019 |
| Event | Joint 9th International Conference on Advances in Materials Technology for Fossil Power Plants, EPRI 2019 and the 2nd International 123HiMAT Conference on High-Temperature Materials - Nagasaki, Japan Duration: Oct 21 2019 → Oct 24 2019 |
Publication series
| Name | Joint EPRI-123HiMAT International Conference on Advances in High-Temperature Materials - Proceedings from EPRI's 9th International Conference on Advances in Materials Technology for Fossil Power Plants and the 2nd International 123HiMAT Conference on High-Temperature Materials |
|---|
Conference
| Conference | Joint 9th International Conference on Advances in Materials Technology for Fossil Power Plants, EPRI 2019 and the 2nd International 123HiMAT Conference on High-Temperature Materials |
|---|---|
| Country/Territory | Japan |
| City | Nagasaki |
| Period | 10/21/19 → 10/24/19 |
Funding
The authors would like to thank A. Willoughby, M. Stephens, T. M. Lowe and T. Jordan for assistance with the experimental work. American Electric Power donated the shot peened 304H tube for this study. This research was sponsored by the Electric Power Research Institute and the Office of Fossil Energy, Cross-cutting Technology Program, U. S. Department of Energy. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).