超声场中浇注温度对7050铝合金半连铸热裂纹的影响  

Effects of Pouring Temperature on Hot Tearing of Direct Chill Casting 7050 Aluminum Under Ultrasonic Vibration

作　　者：张立华[1] 李齐文[1] 

机构地区：[1]中南大学机电工程学院,现代复杂装备设计与极端制造教育部重点实验室,湖南长沙410083

出　　处：《铸造》2010年第12期1271-1275,共5页Foundry

基　　金：国家“973”项目“航空航天用高性能轻合金大型复杂结构件制造的基础研究”(项目编号:2010CB731700)

摘　　要：7050铝合金圆锭半连铸过程极易出现热裂现象。文中在试验基础上,结合RGD热裂判据分析浇注温度对热裂纹的影响机理,并讨论了超声外场对热裂的影响机理。试验证明,7050铝合金半连铸过程在超声场的作用下,适当提高浇注温度,可以减小热裂纹的产生。RGD判据一定程度上可以解释浇注温度与热裂纹的关系。The hot tearing easily occurs in direct chill casting of 7050 aluminum alloy.The mechanics of pouring temperature affecting on hot tearing was investigated on the basis of experiments and the RGD criteria in the condition of ultrasonic vibration,and the effect of ultrasonic vibration on hot tearing was also discussed.It is found that the tendency of hot tearing can be decreased by raising the pouring temperature in the condition of ultrasonic vibration.The relation between pouring temperature and hot tearing can be explained by RGD criteria.

关 键 词：热裂 7050铝合金 半连续铸造 RGD热裂判据 浇注温度 

分 类 号：TG249.9[金属学及工艺—铸造] TB559[理学—物理]