Cross-Sectional Investigations of Oxide Scale Nanocrystalline FeCr Alloys after High-Temperature Oxidation Test at 900°C

3rd International Conference on Functional Materials Science 2016

Saryanto, H.^1 ; Sebayang, D.^2 ; Untoro, P.^3

Gajah Tunggal Polytechnic, Kel. Pasir Jaya, Tangerang-Banten, Indonesia^1

Mercu Buana University, Jln. Meruya Selatan, Jakarta Barat, Indonesia^2

Surya University, Jln. Boulevard Gading Serpong, Banten-Indonesia, Indonesia^3

关键词: After high temperature;    Energy dispersive X ray spectroscopy;    FeCr alloys;    Nanocrystalline Fe-Cr alloys;    Oxidation process;    Oxidation products;    Oxide scale;    Protective layers;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/196/1/012030/pdf
DOI  :  10.1088/1757-899X/196/1/012030

来源: IOP

【 摘 要 】

The cross-sectional examinations of oxide films formed by oxidation on the surface of FeCr alloys with various crystallite sizes were observed and investigated. X-ray diffraction (XRD) analysis was used to characterize the oxide scale morphology and to identify the phases and oxidation products. Furthermore, Scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS) have been used to study the cross-sectional oxides produced by specimens after oxidation process. The cross-sectional investigation shows that the oxide scale formed on the surface of FeCr alloys consisted roughly of Cr2O3with a small amount of FeO mixture. The outward diffusivity of Chromium to form Cr2O3protective layers vary significantly occurrences on the surface of FeCr alloy with smallest crystallite size (38.51 nm), the scale had an enriched Cr content which improves the adherence of the oxide scale to the substrate, in another word, it increases the oxidation resistance. While the oxide scale formed on the surface of FeCr alloy with largest crystallite sizes (76.60 nm) had an enriched Fe content which reduces the resistance to oxidation, and adherence to the substrate. The thickness of oxide scale formed on nanocrystalline FeCr alloy with smallest crystallite sizes was found around 8 μm thick, which three-time thinner than FeCr alloy with largest crystallite sizes.