Anomalous cyclic oxidation behaviour of an Fe-Mn-Si-Cr-Ni alloy: a finite element analysis
| Autor: | Marcelo Falcão de Oliveira, Artur Mariano de Sousa Malafaia, Valdecy Rodrigo do Nascimento, Márcio Eduardo Silveira, Lucas Mendes Sousa |
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| Rok vydání: | 2019 |
| Předmět: |
Austenite
Materials science 020209 energy General Chemical Engineering Alloy Oxide CORROSÃO 02 engineering and technology General Chemistry Substrate (electronics) engineering.material 021001 nanoscience & nanotechnology Thermal expansion Corrosion Stress (mechanics) chemistry.chemical_compound chemistry Ferrite (iron) 0202 electrical engineering electronic engineering information engineering engineering General Materials Science Composite material 0210 nano-technology |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | In previous research, an FeMnSiCrNi alloy presented anomalous behaviour during cyclic oxidation and gained mass after mass loss by spallation. Research clarified this phenomenon, but no stress analysis had been examined. This study investigates this anomalous behaviour using finite element analysis. FeMnSiCrNi alloy oxidation generates a Mn-depleted zone (ferrite) between the substrate (austenite) and oxide layer, and models containing austenite-ferrite-oxide demonstrated that increasing ferrite thickness and roughness (metal/oxide interface) decrease oxide layer stress, helping to comprehend why the alloy stops losing mass. The main cause, increasing roughness, was derived from ferrite plastic deformation and relates to austenite-ferrite thermal expansion mismatch. |
| Databáze: | OpenAIRE |
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