| Autor: |
Sabioni, A.C.S., Huntz, A.M., Salgado, M.F., Pardini, A., Rossi, E.H., Paniago, R.M., Ji, V. |
| Zdroj: |
Materials at High Temperatures; Jul2010, Vol. 27 Issue 2, p89-96, 8p |
| Abstrakt: |
The effect of oxygen partial pressure and temperature on the oxidation behaviour of unstabilized and Nb-stabilized AISI 430 ferritic stainless steels were investigated over the temperature range 850–950°C in air, Ar+1 vpm O2 or Ar–H2–H2O atmospheres. Isothermal thermogravimetric analyses were performed for 50 h. The microstructure of the oxide films grown on the steels were characterized by SEM and chemical analyses were performed by EDS, grazing X-ray diffraction and secondary ion mass spectrometry (SIMS). Nb-stabilized AISI 430 steel is more resistant to oxidation than unstabilized AISI 430 under all tested conditions, except above 900°C in Ar–H2–H2O. While the oxidation behaviour of unstabilized AISI 430 is strongly affected by the atmosphere composition, Nb-stabilized AISI 430 oxidation rates do not depend strongly on the atmosphere. For both steels, the chemical analyses show Cr2O3 as the main phase in the oxide scales, but solid solutions such as FeFe2–xCrxO4 and MnCr2O4 formed in almost all scales for atmospheres of Ar+1 vpm O2 or in Ar–H2–H2O, and Fe2O3 and Mn1.5Cr1.5O4, are also observed for oxidation in air. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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