Chromium vaporization of the ferritic steel Crofer22APU and ODS Cr5Fe1Y2O3 alloy

E. Konysheva, U. Seeling, A. Besmehn, L. Singheiser, K. Hilpert

Research output: Journal PublicationArticlepeer-review

27 Citations (Scopus)

Abstract

The chromium vaporization rate of the Crofer22APU steel as compared to Cr5Fe1Y2O3 alloy was studied under humidified air at 800 °C over a period of up to 1300 h by using the transpiration method. Under oxidizing atmosphere, the Crofer22APU steel forms a (Cr,Mn)3O 4 spinel layer on the surface, which hinders chromium release at 800 °C by about a factor of 3 as compared to Cr5Fe1Y2O3 alloy forming a pure chromia scale. The impact of minor alloying additives in the Crofer22APU ferritic steel on the chromium vaporization was considered. The steel with the lowest amount of Al and Si in the matrix exhibits a low chromium vaporization rate over 1300 h. The microstructure and composition of the oxide scales and surfaces formed were investigated using high-resolution scanning electron microscopy, X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectrometry. The results obtained give insight into the chromium vaporization mechanism.

Original languageEnglish
Pages (from-to)5778-5784
Number of pages7
JournalJournal of Materials Science
Volume42
Issue number14
DOIs
Publication statusPublished - Jul 2007
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science (all)
  • Mechanics of Materials
  • Mechanical Engineering

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