Stress Modeling of Large Cylindrical Ingot Heating Process

Discloses the variation of the thermal stress of the ingot heating process to cylindrical body ingot, for example, the thermal stress change in the heating process of the modeling obtained the variation of the axial, tangential and radial thermal stress,the research results provide a theoretical basis for the corresponding set of process parameters.

An approach for increase of reinforcement content in particle rich zone of centrifugally cast SiCP/Al composites

A cylindrical ingot was produced by means of centrifugal casting using 20 vol.% SiCp/Al composite melt. The melt which was fabricated by double stir-casting method, consisting of three different sizes of SiC particles. SiCp/Al composites were characterized by optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM), and X-ray diffraction (XRD) techniques. The results showed that SiC particles in the 20 vol.% SiCp/Al composite melt migrated towards the outer periphery of the cylindrical ingot under centrifugal force. High reinforcement content SiCp/Al composites were obtained in a zone near the outer periphery of the cylindrical ingot, and the volume fraction of SiC particles reached up to 55%. The thermal expansion test was performed, and the coefficient of thermal expansion (CTE) of the 55 vol.% SiCp/Al composites was found to be 9.9 × 10−6/°C, which was lower than the predicted value based on Kerner’s model and that of 60 vol.% SiCp/Al composites fabricated by conventional processing techniques. This article presented an approach for producing high reinforcement content SiCp/Al composites.