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Huang C.-W.,Nanchang University | Huang C.-W.,Key Laboratory of Near Net Forming in JXP | Yang X.-J.,Nanchang University | Yang X.-J.,Key Laboratory of Near Net Forming in JXP | And 4 more authors.
Zhuzao/Foundry | Year: 2014

The experimental semi-solid slurry preparation equipment of inclined rotating pipe with low speed has been developed to prepare semi-solid A356 alloy slurry, the effects of rotating pipe inclined angle on microstructure refinement and spheroidization in semi-solid A356 alloy were investigated, the flowing status of metal melt in rotating pipe were simulated, and the mechanism of the effect of rotating pipe inclined angle on microstructure of A356 alloy were analyzed. The results show that rotating pipe inclined angle has a significant influence on the microstructure of A356 alloy, while the pouring temperature and the rotating speed are constant. A perfect and nearly spherical semi-solid slurry microstructure can be obtained in inclined angle range of 20°-40°. The grain equivalent diameter is 45 μm and a majority of the grains shape factor are more than 0.8 at 25°, which show the perfect effect of grain refining and roundness. Source


Wu B.-L.,Nanchang University | Wu B.-L.,Key Laboratory of Near Net Forming in JXP | Yang X.-J.,Nanchang University | Yang X.-J.,Key Laboratory of Near Net Forming in JXP | And 4 more authors.
Zhuzao/Foundry | Year: 2014

In the present work, the theoretical methods and recent progress in three-dimensional (3D) reconstruction based on the serial-sections techniques are reviewed. It is pointed out that the method can provide a strong support for quantitatively describing the microstructure and mechanical properties of materials. The 3D microstructure of as-cast A356 aluminum alloy and the 3D microstructure morphology of semi-solid A356 aluminum alloy have been reconstructed from the three-dimensional reconstruction techniques base on Mimics software. The results show that the 3D microstructures of as-cast A356 aluminum alloy are typical dendritic structure, while the semi-solid A356 aluminum alloy are typical nearly spherulite structure. In addition, we have performed the reconstruction as well as the 3D quantitative measurement of the microstructure for single dendrite and sphere crystal. The single spherical crystal was quantitatively characterized from the 3D perspective, and its shape factor F=0.91, the average equivalent diameter Z)=81.71 μm. It means that the results from the 3D measurement are more truthful and accurate. ©, 2014, Zhuzao/Foundry. All right reserved. Source

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