AA5182 铝合金半连续铸造过程热裂敏感性模拟研究

Hot tearing is one of the most common and serious defects in the casting process. For many years, it has been a key topic of research in the field of the casting. In this paper, combined with the three-dimensional decomposition method of strain, the RDG hot tearing prediction criterion was extended to three dimensions, so that it can predict hot tearing more accurately. At the same time, the extended hot tearing criterion was applied on direct chill casting (DC casting), and the influences of casting temperature and casting speed on the hot tearing were investigated. It is found that the formation of shrinkage porosity was related to the cooling rate inside the casting; the deformation porosity mainly depended on the local strain of the casting. Increasing the casting speed significantly promoted the formation of porosity, while increasing the casting temperature inhibited the formation of the shrinking porosity and deformation porosity. In actual production, if the casting temperature and casting speed can be properly adjusted, the purpose of increasing production and reducing hot tearing can be achieved at the same time.