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Article Dans Une Revue Materials Science Forum Année : 2004

High-temperature oxidation behaviour of base material and laser-weld specimens of a thin FeCrAl-RE foil at around 900°C

Résumé

Isothermal oxidation of laser welded FeCrAl-RE samples containing specific fractions of seams in a bead-on-plate "configuration" has been performed at around 900°C and studied using TGA, SEM, TEM and EPMA techniques. An important reduction in the alumina-growth rate on the fusion zone occurs at 900°C, thereby, suppressing the discontinuous increase in mass gain commonly observed during the high temperature oxidation of alumina-forming alloys. This phenomenon is mainly related to the concomitant dramatic chromium carbide precipitation at the fusion zone/scale interface and possible earlier injection of the rare earth elements into the scale. The former, which is linked to the laser melting-induced high free carbon, contributes to the increase in effectiveness of the diffusion barrier provided by the thermally growing scale. The latter is correlated with the initial high Ce+La enrichment at the fusion zone surfaces and is manifested by the elimination of detrimental platelet transformation during the initial stages of oxidation.
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Dates et versions

hal-00164557 , version 1 (20-07-2007)

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  • HAL Id : hal-00164557 , version 1

Citer

Haitham El Kadiri, Régine Molins, Yves Bienvenu. High-temperature oxidation behaviour of base material and laser-weld specimens of a thin FeCrAl-RE foil at around 900°C. Materials Science Forum, 2004, 461-464, pp.1157-1164. ⟨hal-00164557⟩
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