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Effect of Nanocrystalline Structure on the Oxidation Behavior of Fe–20Cr–3Al Alloy at High Temperatures
Journal
Oxidation of Metals
ISSN
0030770X
Date Issued
2022-04-01
Author(s)
Kumar, Rajiv
Singh Raman, R. K.
Bakshi, S. R.
Raja, V. S.
Parida, S.
Abstract
Oxidation behavior of nanocrystalline and microcrystalline Fe–20Cr–3Al alloys was investigated at high temperatures (500–800 °C) in the present study. The nanocrystalline Fe–20Cr–3Al alloy was synthesized by high-energy ball milling followed by spark plasma sintering. The synthesized nanocrystalline Fe–20Cr–3Al alloy was annealed to prepare its microcrystalline counterparts. The nanocrystalline alloy exhibited superior oxidation resistance than its microcrystalline counterparts, which is explained by oxidation kinetics and nature of oxide formed on both the alloys. The presence of higher grain boundary area in the nanocrystalline alloy enhances the diffusivity on metal and as a result, a considerably more protective oxide layer formed on the nanocrystalline alloy. On the other hand, a considerably less protective oxide layer formed on the microcrystalline alloy due to limited diffusion of metal. Additionally, both the nanocrystalline and microcrystalline alloys exhibited superior oxidation resistance at 800 °C than that of 700 °C, which is contrary to common steels. Graphical Abstract: [Figure not available: see fulltext.].
Volume
97
Subjects