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Li Z.,Xiangtan University | Li J.-L.,Xiangtan University | Wang J.-H.,Xiangtan University | Wang J.-H.,Changzhou University | Wang J.-H.,Key Laboratory of Advanced Metal Materials of Changzhou City
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2013

Effect of homogenization treatment on microstructure of Bi-Mn-Fe alloy was investigated by means of scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The results show that as-cast microstructure of Bi-Mn-Fe alloy consists of three phases: BiMn, Mn(Fe) and Bi. For permanent cast Bi-Mn-Fe alloy, Bi distributed discretely in the alloy. For liquid Bi-Mn-Fe alloy quenched in water, Bi distributed continuously in the alloy. The homogenization treatment of Bi-Mn-Fe alloy at 400°C does not change the phase constituent of the alloy. The longer the homogenization time is, the more the amount of BiMn phase. For permanent cast Bi-Mn-Fe alloy, the amount of BiMn phase changed no longer after 16 h homogenization at 400°C. For liquid Bi-Mn-Fe alloy quenched in water, the amount of BiMn phase did not change when the homogenization time was longer than 4 h. After homogenization, the morphology of BiMn phase in Bi-Mn-Fe alloy changed from discrete distribution or isolation to continuous distribution. The amount of BiMn phase in Bi-Mn-Fe alloy annealed at 300°C was more than that at 400°C and it changed no longer when the homogenization time exceeded 8 h. Source


Hu J.,Changzhou University | Hu J.,Key Laboratory of Advanced Metal Materials of Changzhou City | Fang Y.,Changzhou University | Wang Y.,Changzhou University
Advanced Materials Research | Year: 2012

Thermal oxidation treatment is a convenient and environmental friendly technique that can be used to harden the surface of titanium alloys, and hence improve the poor properties of the materials. The aim of the paper is to study the oxidizing kinetics of the process at different temperatures. With this purpose, pure titanium TA2 was subjected to thermal oxidation (TO) treatment in a conventional muffle furnace at 500°C~1050°C for 20mins~930mins under air atmosphere and cooled in the air. The surface morphology of the oxide layer at various temperatures was observed by scanning electron microscopy (SEM). The weight gain after oxidation treatment under different testing condition was measured and calculated. It is concluded that the oxidizing kinetics at 600°C~750°C followed parabolic law, and the parabola rate constant of Kp was investigated. The oxide layer formed at temperatures lower than 800°C is dense and protectable, while it is getting very loose at temperatures higher than 800°C. © (2012) Trans Tech Publications, Switzerland. Source


Hu J.,Changzhou University | Pan X.B.,Changzhou University | Xie F.,Key Laboratory of Advanced Metal Materials of Changzhou City | Gao S.,Changzhou University | Pan T.J.,Changzhou University
Advanced Materials Research | Year: 2011

An energy-saving and high-efficient powder Al and Si codeposition process was employed on 1045 steel, the new technology was mainly based on applying direct current field (DCF) with proper parameters between the treated samples and the powder. The microstructure, thickness and the phase constituents of the coating were analyzed by OM and XRD. The high temperature oxidation resistance for a total duration of 120h and the corrosion resistance in 10% H 2SO4for 8h were investigated. The results showed that DCF could lower heating temperature and accelerate the diffusion rate. The phase of the coatings with DCF was composed of Al0.7Fe3Si 0.3and AlFe3.The treated samples had good high temperature oxidation resistance and corrosion resistance in 10% H2SO 4 solution. © (2011) Trans Tech Publications. © (2011) Trans Tech Publications. Source


Yu Y.,Jiangsu Technical Teacher Training College | Hu J.,Key Laboratory of Advanced Metal Materials of Changzhou City
Advanced Materials Research | Year: 2012

The effect of overheating treatment on the crystal orientation of the Tb0.27Dy0.73Fe1.9 alloy was investigated. The results indicated that different overheating treatment conditions could obtain different crystal orientation. It means that overheating treatment affects the process of Tb0.27Dy0.73Fe1.9 solidification. The conjectural discussions of these results are also presented. © (2012) Trans Tech Publications, Switzerland. Source


Jianhua W.,Changzhou University | Jianhua W.,Key Laboratory of Advanced Metal Materials of Changzhou City | Jianfeng H.,Changzhou University | Jianfeng H.,Key Laboratory of Advanced Metal Materials of Changzhou City | And 5 more authors.
Materials and Design | Year: 2012

The present work focuses on reverse modification of Al-5. wt.%Ti-1. wt.%B master alloy on the structural characteristics and mechanical properties of hypoeutectic ZnAl4Y alloy. The results shows that with the increase of the adding amount of master alloy to ZnAl4Y alloy, the morphology and the kind of primary phase as well as the amount of eutectic structure of the modified alloy vary considerably. With the increase of the adding amount of Al-5. wt.%Ti-1. wt.%B, the tensile strength and the hardness of modified ZnAl4Y alloy increase. When the adding amount is 0.5. wt.%, the impact toughness and the elongation of the alloy reach the maximum. © 2012 Elsevier Ltd. Source

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