Metal/oxide interface roughness evolution mechanism of an FeMnSiCrNiCe shape memory stainless steel under high temperature oxidation

• Published in: Corrosion science Vol. 163; p. 108228
• Main Authors: Rabelo, L.F.P., Silva, R., Della Rovere, C.A., de Sousa Malafaia, A.M.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Ltd 01.02.2020; Elsevier BV
• Subjects: Austenitic stainless steels; Chemical effects; Cyclic testing; Evolution; Ferritic stainless steels; Heat resistant steels; High temperature; High-temperature alloys; Interface roughness; Organic chemistry; Oxidation; Oxidation tests; Plastic deformation; Shape memory; Shape memory stainless steel; Stainless steel; Surfaces and interfaces; X-ray diffraction; High-temperature alloys; Shape memory stainless steel; X-ray diffraction; Oxidation; Surfaces and interfaces
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2019.108228

•Isothermal and cyclic oxidation of an FeMnSiCrNiCe alloy at 950 °C were studied.•A metal/oxide interface roughness evolution mechanism was proposed.•A chemical effect explained interface roughening during isothermal oxidation.•Manganese diffusion coefficients determine ferrite increase and inward oxidation.•Substrate plastic deformation during cyclic oxidation was observed. Previous findings demonstrated roughness increase in the oxide/ferritic Mn-depleted zone interface in an austenitic FeMnSiCrNi shape memory stainless steel (SMSS) cyclic oxidized, generated by plastic deformation. The main aim here was to assess the causes of roughness evolution during cyclic oxidation of an FeMnSiCrNiCe SMSS at 950 °C. Thus, isothermal and cyclic oxidation tests were conducted, metal/oxide interface roughness was measured and the oxide layers characterized. The isothermal tests on the FeMnSiCrNiCe SMSS samples demonstrated increasing roughness, however less than after cyclic tests, allowing the identification of a more complete mechanism, where oxide growth and chemical effects also take place.