|
|
|
| A Review on Hot Tearing Models in Direct Chill Casting of Aluminum Alloys |
| CHEN Dongxu1 , WANG Junsheng1,2, WANG Yu1 , ZHANG Mingshan1 , WANG Bing1 , ZHANG Chi1 , WANG Shuo1 , HAN Jiaqiang3 |
| (1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China; 2. Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing 100081, China; 3. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China) |
|
|
|
|
Abstract 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.
|
|
|
|
|
|
|
|
|
2020, 
