Quantitative µ-CT Analysis of Scale Topology Formed During Oxidation of High SiMo Cast Iron
| Autor: | Wesley Tucker, Asebi Bofah, Tara Selly, Semen Naumovich Lekakh, Tara Godlewski, Mei Li |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Scale (ratio) 020209 energy Metals and Alloys Oxide 02 engineering and technology engineering.material Topology Combustion 01 natural sciences Durability Inorganic Chemistry chemistry.chemical_compound Brittleness chemistry 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Materials Chemistry engineering Cast iron Topology (chemistry) Water vapor |
| Zdroj: | Oxidation of Metals. 94:251-264 |
| ISSN: | 1573-4889 0030-770X |
| DOI: | 10.1007/s11085-020-09989-0 |
| Popis: | High SiMo cast iron components in automotive exhaust systems are exposed to high-temperature oxidation over time. Quantitative analysis of formed oxide scale is therefore important for the assessment of a component durability. The brittle nature of multilayered scale and thermal stress limits capture of a true topology using traditional 2D destructive cut and polish methods. In this study, nondestructive high spatial-resolution 3D µCT analysis was performed on 2.90-mm-diameter oxidized specimens which permitted direct observation with 3.5 µm pixel resolution. The specimens were oxidized in three sequential time steps for a total 100 h at 700 °C and 800 °C in air and combustion gas atmospheres. A MATLAB-coded algorithm was used to quantify the topology, thickness variation in internal and external scale layers, and scale/metal interface unevenness. Scale topology was linked to oxidation temperature and gas atmosphere. A water vapor environment increases scale/metal interface unevenness and scale layer thickness irregularity which were related to an accelerated oxidation rate. |
| Databáze: | OpenAIRE |
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