New Creep-Resistant Cast Alloys with Improved Oxidation Resistance in Water Vapor at 650–800°C
Abstract
Cast stainless steel CF8C-Plus (19wt%Cr/12%Ni) has excellent creep properties, but limited oxidation resistance above 700 C in environments containing H2O. One strategy to improve the alloy oxidation performance is to increase the Cr and Ni concentration. Two new alloys, with, respectively, 21wt%Cr 15wt%Ni and 22wt%Cr 17.5wt%Ni were therefore developed and their long-term oxidation behaviors in humid air were compared with the oxidation behavior of five other cast alloys. Also, at 650 C and 700 C, all the alloys formed internal Cr-rich nodules, and outer nodules or layers rich in Fe and Ni, but they grew a protective Cr-rich inner layer over time. At 750 C, the lower alloyed steels such as CF8C-Plus showed large metal losses, but the two new alloys still exhibited a protective oxidation behavior. The 21Cr 15Ni alloy was severely oxidized in locations at 800 C, but that was not the case for the 22Cr 17.5Ni alloy. Thus, the two new modified alloys represent a potential operating temperature gain of, respectively, 50 C and 100 C in aggressive environments compared with the CF8C-Plus alloy.
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- OSTI Identifier:
- 1265807
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Frontiers in Materials
- Additional Journal Information:
- Journal Volume: 2; Journal ID: ISSN 2296-8016
- Publisher:
- Frontiers Research Foundation
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Dryepondt, Sebastien, Pint, Bruce A., and Maziasz, Philip J. New Creep-Resistant Cast Alloys with Improved Oxidation Resistance in Water Vapor at 650–800°C. United States: N. p., 2015.
Web. doi:10.3389/fmats.2015.00055.
Dryepondt, Sebastien, Pint, Bruce A., & Maziasz, Philip J. New Creep-Resistant Cast Alloys with Improved Oxidation Resistance in Water Vapor at 650–800°C. United States. https://doi.org/10.3389/fmats.2015.00055
Dryepondt, Sebastien, Pint, Bruce A., and Maziasz, Philip J. Thu .
"New Creep-Resistant Cast Alloys with Improved Oxidation Resistance in Water Vapor at 650–800°C". United States. https://doi.org/10.3389/fmats.2015.00055. https://www.osti.gov/servlets/purl/1265807.
@article{osti_1265807,
title = {New Creep-Resistant Cast Alloys with Improved Oxidation Resistance in Water Vapor at 650–800°C},
author = {Dryepondt, Sebastien and Pint, Bruce A. and Maziasz, Philip J.},
abstractNote = {Cast stainless steel CF8C-Plus (19wt%Cr/12%Ni) has excellent creep properties, but limited oxidation resistance above 700 C in environments containing H2O. One strategy to improve the alloy oxidation performance is to increase the Cr and Ni concentration. Two new alloys, with, respectively, 21wt%Cr 15wt%Ni and 22wt%Cr 17.5wt%Ni were therefore developed and their long-term oxidation behaviors in humid air were compared with the oxidation behavior of five other cast alloys. Also, at 650 C and 700 C, all the alloys formed internal Cr-rich nodules, and outer nodules or layers rich in Fe and Ni, but they grew a protective Cr-rich inner layer over time. At 750 C, the lower alloyed steels such as CF8C-Plus showed large metal losses, but the two new alloys still exhibited a protective oxidation behavior. The 21Cr 15Ni alloy was severely oxidized in locations at 800 C, but that was not the case for the 22Cr 17.5Ni alloy. Thus, the two new modified alloys represent a potential operating temperature gain of, respectively, 50 C and 100 C in aggressive environments compared with the CF8C-Plus alloy.},
doi = {10.3389/fmats.2015.00055},
journal = {Frontiers in Materials},
number = ,
volume = 2,
place = {United States},
year = {Thu Aug 13 00:00:00 EDT 2015},
month = {Thu Aug 13 00:00:00 EDT 2015}
}
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