Aluminum alloys are widely used in aerospace

rail transportation

automobile lightweight and other fields. Semi-continuous direct cooling casting technology is an important method for preparing large aluminum alloy ingots. However

in this preparation process

hot tearing is a serious casting defect

and the control of hot tearing defects is a key technology for preparing high-quality large ingots. In this paper

the development overview of direct chill casting (DC casting)

the formation mechanism and prediction model of hot tearing are summarized

and the calculation results of hot tearing susceptibility based on several hot tearing criterion are analyzed and compared with the casting practice. The results show that none of hot tearing criterion can quantitatively predict the occurrence of hot tearing. In terms of qualitative prediction

the RDG criterion has the greatest application potential. The future prospect of the integration of micro-macro theoretical calculations and advanced observation methods is proposed. When developing hot tearing criterion

multiphase mechanics

fracture mechanics

fluid flow and alloy thermodynamics should be linked

and the nucleation-expansionhealing complex mechanism in the three-dimensional pasty zone should be considered.