High-temperature cyclic oxidation behaviour of a hot-dip aluminium-coated 12%Cr stabilised ferritic stainless steel
High-temperature cyclic oxidation behaviour of a hot-dip aluminium-coated 12%Cr stabilised ferritic stainless steel
- New search for: Antoni, L.
- New search for: Baroux, B.
- New search for: Antoni, L.
- New search for: Baroux, B.
The long term high-temperature cyclic oxidation behaviour of a hot-dip aluminium-coated 12%Cr titanium stabilised ferritic stainless steel has been investigated in air between 650 and 850 deg C. The degradation depths remain small (<= 40 microns) while keeping a nice visual aspect even after 1200 cycles (equivalent to 400 h at the test temperature). The most important part of the degradation occurs during the first cycles and develops slowly thereafter when inter-diffusion between aluminium coating and stainless steel leads to the formation of an Fe-Cr-Si-Al coating, with a gradient of Al and Si concentration from the surface to the base metal. Two types of degradation are observed: thin cracks within the coating due to thermal cycling and localised oxidation of the underlying steel due to the applied initial bending deformation of the samples. Owing to Al diffusion into the metal, the former defects are rapidly stopped by the formation of a protective alumina scale. The high cyclic oxidation resistance of the underlying Fe12CrTi grade ensures a slow growth of the latter.
Document information
High-temperature cyclic oxidation behaviour of a hot-dip aluminium-coated 12%Cr stabilised ferritic stainless steel
2001
14 Seiten, 7 Bilder, 2 Tabellen, 11 Quellen
Conference paper
English
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