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- 저자 : Laizhu Jiang (검색결과 2 건)
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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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Flow Behaviour and Constitutive Modelling of a Ferritic Stainless Steel at Elevated Temperatures
Jingwei Zhao,Zhengyi Jiang,Guoqing Zu,Wei Du,Xin Zhang,Laizhu Jiang 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.3
The flow behaviour of a ferritic stainless steel (FSS) was investigated by a Gleeble 3500 thermal-mechanical test simulator over the temperature range of 900-1100 °C and strain rate range of 1-50 s -1 . Empirical and phenomenological constitutive models were established, and a comparative study was made on the predictability of them. The results indicate that the flow stress decreases with increasing the temperature and decreasing the strain rate. High strain rate may cause a drop in flow stress after a peak value due to the adiabatic heating. The Zener-Hollomon parameter depends linearly on the flow stress, and decreases with raising the temperature and reducing the strain rate. Significant deviations occur in the prediction of flow stress by the Johnson-Cook (JC) model, indicating that the JC model cannot accurately track the flow behaviour of the FSS during hot deformation. Both the multiple-linear and the Arrhenius-type models can track the flow behaviour very well under the whole hot working conditions, and have much higher accuracy in predicting the flow behaviour than that of the JC model. The multiple-linear model is recommended in the current work due to its simpler structure and less time needed for solving the equations relative to the Arrhenius-type model.
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