| In the study of material science,the scientific quantitative characterization and experimental observation,which has been a material Three-dimensional microstructure morphology research at the core of the problem.3D reconstruction is one of the most basic method for 3D structure,to provide comprehensive real and accurate 3D space organization information.Through the process to control the material forming process,to control the microstructure of the be needed.This is the research target of scientific research workers.This study has been put forward the Three-dimensional reconstruction basic operation process, which are based on serial sectioning In the laboratory,including 3D organization characterized quantitatively analysis method.Using three dimensional reconstruction method,has already obtained 3D reconstruction of castings microstructure under different process conditions,and quantitative characterization analysis was carried on. Casting of the experimental products, we got the primary phase and eutectic phase organizations through 3D reconstruction, on the basis of three dimensional, has carried on the quantitative characterization and research. It has practical guidance significance for the rheological forming process.The reconstruction results show that in the two cases of 3D and 2D, the data information reflected by are quite different.Get the three-dimensional dendritic structure of A356 aluminum alloy under the condition of liquid casting process.Measured in a single dendritic structure,the secondary dendrite spacing is about 23.94μm,and the dendritic main shaft length 338.58μm, any two secondary dendrite is about 29.63 Angle.Under the condition of semi-solid casting, through 3D reconstruction, we obtained the A356 aluminum alloy three-dimensional topography.we measured the axis of the elliptic spherulite is 91.29μm, and the short one is 72.19μm. through 3D measurement, We get the elliptic spherulite surface area S=21618.01μm2,while volume V=285457.52μm3.Generation into the formula, the shape factor F=0.91, and the nearly spherulite average ball diameter D=81.71μm.Using the same method for three-dimensional reconstruction for the microstructure ofliquid hub casting, analysis the three–dimensional morphology of single dendrite which extracted from the microstructure, the total volume was about 11115861.13μm3,the total surface area of?entities was 1219573.59μm2. The morphology of three-dimensional solid shrinkage cavity defects was gotten through three-dimensional reconstruction. From three-dimensional measurement, we found that the cavity surface area of the shrinkage internal defects was 2705.81μm2; the space capacity gas was about 9749.71μm3, which was wrapped in the hole. There were a lot of needle-like cavity projections and recesses in the shrinkage defects, and the surface of the hole was not smooth.Three-dimensional morphology of the semi-solid casting organization which was obtained from above, the total volume of the entire body was 178274564.33μm3, the total volume of the entire body was236044691μm3, so we calculated the solid fraction F was 0.76. Part of the primary phase through three-dimensional reconstruction, close integration between the primary crystal ball to each other were connected together. Various cutaway views could obtain from cut function, a more detailed study of the research was implemented in the regional which was required. Setting transparent mode, it was more easily understand and convenient to observe the three-dimensional solid morphology of primary phase in the transparent mode, and even could observe with three-dimensional measurement in the internal of the organization. |
