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Quantitative ยต-CT Analysis of Scale Topology Formed During Oxidation of High SiMo Cast Iron
- Source :
- Oxidation of Metals. 94:251-264
- Publication Year :
- 2020
- Publisher :
- Springer Science and Business Media LLC, 2020.
-
Abstract
- 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.
- Subjects :
- 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
Subjects
Details
- ISSN :
- 15734889 and 0030770X
- Volume :
- 94
- Database :
- OpenAIRE
- Journal :
- Oxidation of Metals
- Accession number :
- edsair.doi...........765735f916e6d90230630f34e750f58f