High Temperature Oxidation of Micro-alloyed Steel and Its Scale Adhesion |
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| Authors: | Komsan?Ngamkham Email author" target="_blank">Somrerk?Chandra-ambhornEmail author |
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| Affiliation: | 1.Department of Mechanical Engineering, Faculty of Industrial Education,Rajamangala University of Technology Suvarnabhumi Suphanburi,Suphanburi,Thailand;2.High Temperature Corrosion Research Centre, Department of Materials and Production Technology Engineering, Faculty of Engineering,King Mongkut’s University of Technology North Bangkok,Bangkok,Thailand |
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| Abstract: | The present work investigated the high temperature oxidation behaviour of the micro-alloyed steel and the adhesion of thermal oxide scale to its steel substrate. Oxidation testing was conducted at 815 °C in oxygen without and with 17.9% v/v water vapour. The oxidation kinetics in the two atmospheres were parabolic with similar rate constants, i.e. 1.13 × 10?9 and 1.17 × 10?9 g2 cm?4 s?1 for the sample oxidised in oxygen without and with water vapour, respectively. The XRD peaks for wustite, magnetite, Ti-doped magnetite and titanium carbide were detected for the sample oxidised in oxygen. For the sample oxidised in the humidified atmosphere, Ti-doped magnetite was dominantly observed, additionally with titanium carbide. A tensile testing machine equipped with an optical lens was used to monitor scale failure during straining. For the sample oxidised for 1 min, the strain initiating the first spallation of the steel oxidised in the humidified oxygen was 1.74 ± 0.14%. This strain was higher than the strain initiating the first spallation of the steel oxidised in oxygen which was 1.00 ± 0.04%, indicating the improved adhesion of scale formed in the atmosphere containing water vapour. Mechanisms of water vapour effect on scale adhesion are discussed. |
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