Transport Properties and Oxidation in Chromium and Fe-Cr Alloys Exposed to Oxygen at High Temperatures
- Argonne National Laboratory (ANL), Argonne, IL (United States)
Alloys samples of Fe-25Cr, Fe-25Cr-0.3 and 1Y, and Fe-25Cr-1Ce were subjected to oxidation tests in a microbalance at temperatures between 700 and 1000{degrees}C and at oxygen partial pressures in a range of 1 to 10{sup {minus}20} atm for time periods of 19 to 160 h. Integrity of the scales was also evaluated by quenching from the oxidation temperature to room temperature in {approximately}20 minutes. During quenching, the 24-h oxidized samples of Fe-25Cr showed total spallation of oxide layers from the alloy substrate. However, the Y- Ce-containing alloys did not show scale spallation during thermal quenching. To determine total spallation behavior in Fe-25Cr, the oxidation and quenching tests were repeated twice with the same samples. To learn why the scale in the second and third oxidation/quenching runs did not spall as in the first run, we focused on alloy grain growth behavior during oxidation. Cation mixing properties obtained by electrical conductivity measurements on oxidized specimens were compared with the oxygen diffusivity in the corrosion product formed on the Fe-25Cr alloy.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Fossil Energy and Carbon Management (FECM)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5331217
- Report Number(s):
- ANL/CP-71551; CONF-910909--12; ON: DE91018571
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ANNEALING
CERIUM ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
CORROSION RESISTANCE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY SOURCES
FOSSIL FUELS
FUELS
HEAT TREATMENTS
IRON ALLOYS
IRON BASE ALLOYS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PROCESSING
RARE EARTH ALLOYS
SCALING
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM ALLOYS