基于渣-气耦合运动模型的铝合金铸件渣气孔形成研究  

Study of Slag Blowhole Formation in Aluminium Alloy Casting Based on Slag-Gas Coupling Motion Model

作　　者：饶磊[1] 柏雪 董云鹏 游凯[1] RAO Lei;BAI Xue;DONG Yun-peng;YOU Kai(College of Mechanics and Materials,Hohai University,Nanjing 211100,Jiangshu,China)

机构地区：[1]河海大学力学与材料学院,江苏南京211100

出　　处：《铸造》2022年第1期28-33,共6页Foundry

基　　金：国家自然科学基金(51775167)。

摘　　要：针对铝合金铸件中常见的渣气孔缺陷,综合考虑铸造过程中渣粒的聚合运动与氢气的析出吸附之间的动态耦合特征,构建了渣气耦合运动数学模型。研究了铝合金充型及凝固过程中氢气析出、吸附长大、碰撞聚合及随流运动过程,并对圆柱形试样中渣气孔的分布及形貌进行了试验与模拟研究。结果表明,渣气耦合现象促进了渣粒与氢气的上浮,降低了铸件内部渣、气缺陷出现几率。所建立的渣气耦合运动模型提升了对渣气孔缺陷预测的准确性。Aimed at the slag blowhole in aluminium casting,by considering the dynamic coupling characteristic between the aggregation motion of slag and precipitation-adsorption of hydrogen,a slag-gas coupling motion model has been built in this paper.The hydrogen precipitation,adsorption growth,the collision aggregation and the moving trajectory with fluent have been studied in the aluminium alloy casting process.The results showed that the slag-gas coupling phenomenon prompted the slag and gas floating upward,and it can reduce the inclusion and gas hole defects probability in the casting.The slag-gas coupling motion model prompts the forecast accuracy of the slag blowhole defect significantly.

关 键 词：渣气孔 耦合运动 铝合金 数值模拟 

分 类 号：TG211[金属学及工艺—铸造]