ANGELO FERNANDO PADILHA
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Artigo IPEN-doc 22608 The effect of niobium on the oxidation behaviour of fully austenitic Fe-15%Cr-15%Ni stainless steels1995 - RAMANATHAN, L.V.; POHL, M.; PADILHA, A.F.The influence of niobium content (0.5-2.0 wt.%) on the oxidation behaviour of Fe-15% Cr-15% Ni austenitic stainless steels has been studied by cyclic oxidation tests in air at different temperatures in the range 800-1200 ºC. The isothermal oxidation rate, the scaling index and the cumulative oxide loss decreased with increasing niobium content. X-ray diffraction and fluorescence analysis of detached oxide scales revealed that the niobium in the alloy matrix facilitated the formation of chromium rich (Fe,Cr)203 and niobium containing mixed oxide near the metaumetal oxide boundary, which decreased further oxidation. SEM/EDX investigations revealed that the external oxide changed from being predominantly iron rich iron-chromium oxide to being chromium rich iron-chromium oxide.Resumo IPEN-doc 02647 Superalloy applications in the nuclear field1984 - RAMANATHAN, L.V.; PADILHA, A.F.Artigo IPEN-doc 03231 Efeito do niobio sobre corrosao de acos inoxidaveis austeniticos1988 - PESSINE, E.J.; RAMANATHAN, L.V.; PADILHA, A.F.Artigo IPEN-doc 03214 The influence of niobium on the oxidation of all-austenite stainless steels1987 - RAMANATHAN, L.V.; PADILHA, A.F.