Abstract
The effect of annealing on the growth and the microstructure of thermally-grown oxides (TGOs) of foils of alloy 617 were investigated. Oxidation tests were performed on ∼100 µm thick foils. Three types of foils, namely as-rolled (A-R), rolled-annealed at 950 °C (R-A:950) and rolled-annealed at 1100 °C (R-A:1100) were oxidized at 1000 °C. The surface and the cross-sectional microstructures, the inter-diffusion behavior and the chemical compositions of the TGOs were investigated by using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). The surface roughness of the TGOs, the voids in the oxide scale, and the cracks in the oxide nodules were suppressed for the R-A:1100 foils. According to EDX-mapping, the surface oxide was observed to be chromia (Cr2O3), and internal oxides were observed to be alumina (α-Al2O3). Decarburization was observed beneath the superficial oxide scales while the thickness of carbide layer increased towards the interior of the metal.
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Sharma, S.K., Kim, D.Y. & Kang, KJ. Effect of annealing on the growth and the microstructure of thermally-grown oxides on foils of alloy 617. Journal of the Korean Physical Society 63, 1755–1759 (2013). https://doi.org/10.3938/jkps.63.1755
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DOI: https://doi.org/10.3938/jkps.63.1755