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Type: Journal article
Title: Degradation of ferritic stainless steels at 1200 ºC in air
Author: Cheng, X.-W.
Jiang, Z.-Y.
Monaghan, B.J.
Longbottom, R.J.
Wei, D.-B.
Hee, A.C.
Jiang, L.-Z.
Citation: Materials and Corrosion, 2018; 69(1):63-75
Publisher: Wiley
Issue Date: 2018
ISSN: 0947-5117
Statement of
X.-W. Cheng, Z.-Y. Jiang, B.J. Monaghan, R.J. Longbottom, D.-B. Wei, A.C. Hee, L.-Z. Jiang
Abstract: Three commercial ferritic stainless steels were investigated at 1200 °C by a thermogravimetric analyser (TGA) in air. The oxidation kinetics of the ferritic stainless steels differed significantly. The adhesion of the Cr₂O₃ scale, the morphology of the SiO₂, with or without (Cr, Mn)₃O₄ spinel on the top can greatly influence the oxidation and the degradation behaviour of the steels. Although the SUS430 steel had less Cr among the ferritic stainless steels (16.2 wt% Cr), it did not show more degradation behaviour than the B443NT steel (21.0 wt% Cr). The spallation of the protective oxide scale on the B443NT steel was caused by vacancy condensation at the scale/substrate interface where the SiO₂ particles were and the developed compressive stresses within the oxide scale during oxidation. (Cr, Mn)₃O₄ spinel on the top of the Cr₂O₃ scale on the B445J1M steel influenced its evaporation rate. The thermodynamic aspect of the chemical composition and oxidation atmosphere of the Fe–Cr–O system was also discussed.
Keywords: Degradation; interfaces; oxidation; reheating; stainless steel
Rights: © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
DOI: 10.1002/maco.201709577
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