High Temperature Oxidation of Hot-Dip Aluminized T92 Steels
| Autor: | Muhammad Ali Abro, Junhee Hahn, Dong Bok Lee |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
020502 materials Diffusion Alloy Metals and Alloys chemistry.chemical_element 02 engineering and technology Substrate (electronics) engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Oxygen 0205 materials engineering Coating chemistry Mechanics of Materials Materials Chemistry engineering Surface modification Composite material 0210 nano-technology Concentration gradient Layer (electronics) |
| Zdroj: | Metals and Materials International. 24:507-515 |
| ISSN: | 2005-4149 1598-9623 |
| DOI: | 10.1007/s12540-018-0064-0 |
| Popis: | The T92 steel plate was hot-dip aluminized, and oxidized in order to characterize the high-temperature oxidation behavior of hot-dip aluminized T92 steel. The coating consisted of Al-rich topcoat with scattered Al3Fe grains, Al3Fe-rich upper alloy layer with scattered (Al, Al5Fe2, AlFe)-grains, and Al5Fe2–rich lower alloy layer with scattered (Al5Fe2, AlFe)-grains. Oxidation at 800 °C for 20 h formed (α-Al2O3 scale)/(AlFe layer)/(AlFe3 layer)/(α-Fe(Al) layer), while oxidation at 900 °C for 20 h formed (α-Al2O3 scale plus some Fe2O3)/(AlFe layer)/(AlFe3 layer)/(α-Fe(Al) layer) from the surface. During oxidation, outward migration of all substrate elements, inward diffusion of oxygen, and back and forth diffusion of Al occurred according to concentration gradients. Also, diffusion transformed and broadened AlFe and AlFe3 layers dissolved with some oxygen and substrate alloying elements. Hot-dip aluminizing improved the high-temperature oxidation resistance of T92 steel through preferential oxidation of Al at the surface. |
| Databáze: | OpenAIRE |
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