Journal
CORROSION SCIENCE
Volume 170, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2020.108654
Keywords
Alumina-forming austenitic alloy; High entropy alloy; Fe-Cr-Al-Ni alloy; Steam oxidation; Alumina scale formation
Funding
- Helmholtz program NUSAFE at the Karlsruhe Institute of Technology
- EC Horizon 2020 project IL TROVATORE [740415]
- China Scholarship Council (CSC) [201506230151]
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Oxidation tests of alumina-forming austenitic (AFA) alloys and high entropy alloys (HEA) have been performed in steam at 1200 degrees C. AFA alloys with composition formula Fe-3Al-16Cr-(19-21)Ni (wt.%) and HEA with formula Al(7.9-8.9)Cr(21.4-23.2)Ni(34.3-35)Febal (at.%) show low oxidation rate due to the formation of alpha-Al2O3 scale. By adding yttrium to AFA or niobium to HEA, the samples show no evidence of scale exfoliation. HEA with titanium addition forms a thick oxide layer based on TiO2, Cr2O3 and internal Al oxidation. The growth of oxide scale is discussed based on the oxygen partial pressure of metal oxides and dissociation oxygen pressure of the steam.
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