Transient oxidation in Fe-Cr-Ni alloys: A Raman-scattering study
- Argonne National Lab., IL (United States)
Using Raman scattering the authors have investigated the oxidation, in air, of the Fe-Cr-Ni stainless steels Fe-25Cr-20Ni, Fe-25Cr-20Ni-3Zr, and Fe-24Cr-3Zr (wt.%) as a function of temperature in the range 300 to 1000{degrees}C The Raman technique is very sensitive to, and provides a clear identification of the oxides Fe{sub 2}O{sub 3} and Cr{sub 2}O{sub 3}. However, the technique is insensitive to NiO, FeO, and does not give a clear identification of spinels. The Fe-Cr-Ni alloys form chromia scales at temperatures greater than {approximately}800{degrees}C. At lower oxidation temperatures, transient phases are observed. With a 1-h heat treatment at 300{degrees}C, the authors observe the formation of an unidentified scale; they speculate that it is either amorphous or consists of disordered spinel(s). Near 400{degrees}C they begin to observe hematite (Fe{sub 2}O{sub 3}). The intensity of the Fe{sub 2}O{sub 3} signal increases with temperature to {approximately}600{degrees}C and then decreases, being largely replaced by the signal from Cr{sub 2}O{sub 3}. The thickness of the Cr{sub 2}O{sub 3} scale increases with temperature up to {approximately}1000{degrees}C above which spallation becomes apparent. Spinel phases also apparently persist in the scale to 1000{degrees}C.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 482498
- Journal Information:
- Oxidation of Metals, Vol. 46, Issue 5-6; Other Information: PBD: Dec 1996
- Country of Publication:
- United States
- Language:
- English
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