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Title: The role of Zr and Nb in oxidation/sulfidation behavior of Fe-Cr-Ni alloys

Abstract

05Structural Fe-Cr-Ni alloys may undergo rapid degradation at elevated temperatures unless protective surface oxide scales are formed and maintained. The ability of alloys to resist rapid degradation strongly depends on their Cr content and the chemistry of the exposure environment. Normally, 20 wt % Cr is required for service at temperatures up to 1000{degree}C; the presence of sulfur, however, inhibits formation of a protective surface oxide scale. The oxidation and sulfidation behavior of Fe-Cr-Ni alloys is examined over a wide temperature range (650 to 1000{degree}C), with particular emphasis on the effects of alloy Cr content and the radiation of reactive elements such as Nb and Zr. Both Nb and Zr are shown to promote protective oxidation behavior on the 12 wt % Cr alloy in oxidizing environments and to suppress sulfidation in mixed oxygen/sulfur environments. Additions of Nb and Zr at 3 wt % level resulted in stabilization of Cr{sub 2}O{sub 3} scale and led to a barrier layer of Nb- or Zr-rich oxide at the scale/metal interface, which acted to minimize the transport of base metal cations across the scale. Oxide scales were preformed in sulfur-free environments and subsequently exposed to oxygen/sulfur mixed-gas atmospheres. Preformed scales were found tomore » delay the onset of breakaway corrosion. Corrosions test results obtained under isothermal and thermal cycling conditions are presented. 58 refs., 55 figs., 8 tabs.« less

Authors:
 [1];  [2]
  1. Argonne National Lab., IL (USA)
  2. Argonne National Lab., IL (USA) INCO Alloy Ltd., Hereford, England (UK)
Publication Date:
Research Org.:
Argonne National Lab., IL (USA)
Sponsoring Org.:
DOE/FE
OSTI Identifier:
6281516
Report Number(s):
ANL/FE-90/2
ON: DE91005749
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CHROMIUM ALLOYS; CORROSION; IRON BASE ALLOYS; NICKEL ALLOYS; NIOBIUM ALLOYS; METALLURGICAL EFFECTS; ZIRCONIUM ALLOYS; CHROMIUM OXIDES; HEAT TREATMENTS; MANGANESE ADDITIONS; MICROSTRUCTURE; NIOBIUM ADDITIONS; OXIDATION; SCALING; SILICON ADDITIONS; SULFIDATION; ZIRCONIUM ADDITIONS; ALLOYS; CHALCOGENIDES; CHEMICAL REACTIONS; CHROMIUM COMPOUNDS; CRYSTAL STRUCTURE; IRON ALLOYS; MANGANESE ALLOYS; OXIDES; OXYGEN COMPOUNDS; SILICON ALLOYS; TRANSITION ELEMENT COMPOUNDS; 360105* - Metals & Alloys- Corrosion & Erosion

Citation Formats

Natesan, K, and Baxter, D J. The role of Zr and Nb in oxidation/sulfidation behavior of Fe-Cr-Ni alloys. United States: N. p., 1990. Web. doi:10.2172/6281516.
Natesan, K, & Baxter, D J. The role of Zr and Nb in oxidation/sulfidation behavior of Fe-Cr-Ni alloys. United States. https://doi.org/10.2172/6281516
Natesan, K, and Baxter, D J. Thu . "The role of Zr and Nb in oxidation/sulfidation behavior of Fe-Cr-Ni alloys". United States. https://doi.org/10.2172/6281516. https://www.osti.gov/servlets/purl/6281516.
@article{osti_6281516,
title = {The role of Zr and Nb in oxidation/sulfidation behavior of Fe-Cr-Ni alloys},
author = {Natesan, K and Baxter, D J},
abstractNote = {05Structural Fe-Cr-Ni alloys may undergo rapid degradation at elevated temperatures unless protective surface oxide scales are formed and maintained. The ability of alloys to resist rapid degradation strongly depends on their Cr content and the chemistry of the exposure environment. Normally, 20 wt % Cr is required for service at temperatures up to 1000{degree}C; the presence of sulfur, however, inhibits formation of a protective surface oxide scale. The oxidation and sulfidation behavior of Fe-Cr-Ni alloys is examined over a wide temperature range (650 to 1000{degree}C), with particular emphasis on the effects of alloy Cr content and the radiation of reactive elements such as Nb and Zr. Both Nb and Zr are shown to promote protective oxidation behavior on the 12 wt % Cr alloy in oxidizing environments and to suppress sulfidation in mixed oxygen/sulfur environments. Additions of Nb and Zr at 3 wt % level resulted in stabilization of Cr{sub 2}O{sub 3} scale and led to a barrier layer of Nb- or Zr-rich oxide at the scale/metal interface, which acted to minimize the transport of base metal cations across the scale. Oxide scales were preformed in sulfur-free environments and subsequently exposed to oxygen/sulfur mixed-gas atmospheres. Preformed scales were found to delay the onset of breakaway corrosion. Corrosions test results obtained under isothermal and thermal cycling conditions are presented. 58 refs., 55 figs., 8 tabs.},
doi = {10.2172/6281516},
url = {https://www.osti.gov/biblio/6281516}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1990},
month = {11}
}