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        High Temperature Oxidation Behaviour of Ferritic Stainless Steel SUS 430 in Humid Air

        Xiawei Cheng,Zhengyi Jiang,Dongbin Wei,Jingwei Zhao,Brian J. Monaghan,Raymond J. Longbottom,Laizhu Jiang 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.2

        The high temperature oxidation behaviour of ferritic stainless steel SUS 430 was investigated over the temperaturerange from 1000 to 1150 °C in humid air containing 18% water vapour. Isothermal thermogravimetricanalyses were performed to study the oxidation kinetics. The microstructure, composition and thickness ofthe oxide scale formed were investigated via optical microscopy (OM), X-ray diffraction and a scanning electronmicroscope equipped with an energy dispersive spectrometer. The results indicate that breakaway oxidationoccurs at all temperatures and that its onset is accelerated by increasing temperature. The growth rate of themultilayer oxide scale follows a parabolic law with apparent activation energy of 240.69 kJ/mol, and theformation of FeO is decreased when the temperature is higher than 1120°C. The inner oxide scale, Fe-Cr spinel,grows mainly inward and internal oxidation is observed even in a short oxidation test at 1150°C for 105 s. The mechanism of high temperature oxidation of SUS 430 in humid air containing 18% water vapour is discussed.

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