Abstract
Type 347 stainless steel foils are commonly used in primary surface recuperators of gas turbines at gas inlet temperatures up to 600°C. At higher temperatures, accelerated attack due to water vapor in the exhaust gas limits performance. Therefore, new low-cost alternative alloys are being developed with sufficient creep and corrosion resistance at 700°C. The laboratory creep and corrosion performance of an initial attempt at a Fe-20Cr-20Ni-base alloy are presented. The addition of 4Mn in this alloy was successful in preventing accelerated attack at 650-700°C; however, it significantly increased the overall oxidation rate and this likely will lead to a long-term durability problem for thin sections of this material.
| Original language | English |
|---|---|
| Journal | NACE - International Corrosion Conference Series |
| Volume | 2005-April |
| State | Published - 2005 |
| Event | Corrosion 2005 - Houston, United States Duration: Apr 3 2005 → Apr 7 2005 |
Bibliographical note
Publisher Copyright:© 2005 by NACE International.
Funding
The authors wish to thank J. D. Vought at ORNL for casting the alloys, G. W. Garner and J. Moser for performing the oxidation exposures, H. Longmire for performing the metallography and L. Walker for performing the microprobe work. P. F. Tortorelli and D. F. Wilson at ORNL reviewed the manuscript. The research was sponsored by the U.S. Department of Energy, Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Distributed Energy, under contract DE-AC05-00OR22725 with UT-Battelle, LLC.
| Funders | Funder number |
|---|---|
| Office of Distributed Energy | DE-AC05-00OR22725 with UT-Battelle |
| U.S. Department of Energy | |
| Office of Energy Efficiency and Renewable Energy |
Keywords
- Alloy composition
- Gas turbines
- Recuperators
- Stainless steel
- Water vapor