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Title: Performance of Wrought Superalloys in Extreme Environments

Abstract

As power generation systems move towards higher efficiency operation above 700 °C, wrought superalloys are the leading structural alloy candidates, including precipitation strengthened (PS) alloys 740 and 282 for the highest temperatures. To evaluate the performance of these alloys for these applications, a range of 500–5000 h evaluations have been conducted in environments including steam, supercritical CO2 (sCO2) and simulated combustion exhaust with H2O and/or SO2 at 700–800 °C and compared to baseline exposures in laboratory air and 1 bar CO2. These alloys primarily rely on the formation of an external Cr-rich oxide layer or scale for environmental protection and the reaction rates in all of these conditions are similar and relatively low. However, compared to a conventional solid solution strengthened alloy, like 625, the mass gains are higher for PS alloys due to the internal oxidation of the γ' forming additions, Al and Ti. Post-exposure characterization has quantified the reaction products and the depth of internal oxidation is not a concern and does not appear to increase above the baseline behavior in laboratory air. Likewise, there is no indication of internal carburization in the sCO2 environment at 750 °C/300 bar. The addition of 0.1% SO2 in CO2-10% H2O atmore » 800 °C actually suppressed the internal oxidation at 1 bar but SO2 may be a concern when the total pressure is higher.« less

Authors:
ORCiD logo [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1471929
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: 9th International Symposium on Superalloy 718 and Derivatives , Pittsburgh, Pennsylvania, United States of America, 6/3/2018 4:00:00 AM-6/6/2018 4:00:00 AM
Country of Publication:
United States
Language:
English

Citation Formats

Pint, Bruce A. Performance of Wrought Superalloys in Extreme Environments. United States: N. p., 2018. Web. doi:10.1007/978-3-319-89480-5_9.
Pint, Bruce A. Performance of Wrought Superalloys in Extreme Environments. United States. doi:10.1007/978-3-319-89480-5_9.
Pint, Bruce A. Tue . "Performance of Wrought Superalloys in Extreme Environments". United States. doi:10.1007/978-3-319-89480-5_9. https://www.osti.gov/servlets/purl/1471929.
@article{osti_1471929,
title = {Performance of Wrought Superalloys in Extreme Environments},
author = {Pint, Bruce A.},
abstractNote = {As power generation systems move towards higher efficiency operation above 700 °C, wrought superalloys are the leading structural alloy candidates, including precipitation strengthened (PS) alloys 740 and 282 for the highest temperatures. To evaluate the performance of these alloys for these applications, a range of 500–5000 h evaluations have been conducted in environments including steam, supercritical CO2 (sCO2) and simulated combustion exhaust with H2O and/or SO2 at 700–800 °C and compared to baseline exposures in laboratory air and 1 bar CO2. These alloys primarily rely on the formation of an external Cr-rich oxide layer or scale for environmental protection and the reaction rates in all of these conditions are similar and relatively low. However, compared to a conventional solid solution strengthened alloy, like 625, the mass gains are higher for PS alloys due to the internal oxidation of the γ' forming additions, Al and Ti. Post-exposure characterization has quantified the reaction products and the depth of internal oxidation is not a concern and does not appear to increase above the baseline behavior in laboratory air. Likewise, there is no indication of internal carburization in the sCO2 environment at 750 °C/300 bar. The addition of 0.1% SO2 in CO2-10% H2O at 800 °C actually suppressed the internal oxidation at 1 bar but SO2 may be a concern when the total pressure is higher.},
doi = {10.1007/978-3-319-89480-5_9},
journal = {},
issn = {2367-1181},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {5}
}

Conference:
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