AA7050合金半连铸开裂及变形机制  

Mechanism of Cracking and Ingot Distortion During Direct Chill Casting of AA7050 Alloy

作　　者：白清领 缪姚军 单小龙 周峰 BAI Qing-ling;MIAO Yao-jun;SHAN Xiao-long;ZHOU Feng(Shanghai Zhongtian aluminum wire Co.,Ltd.,Shanghai 201108,China;Jiangsu Zhongtian Technology Co.,Ltd.,Jiangsu 226463,Nantong,China)

机构地区：[1]上海中天铝线有限公司,上海201108 [2]江苏中天科技股份有限公司,江苏南通226463

出　　处：《铸造》2023年第1期77-81,共5页Foundry

摘　　要：通过数值模拟对工业大规格铸锭在半连铸过程中的应力场分布以及铸锭的变形进行了研究,分析了铸锭可能的开裂方式以及铸锭变形的机制,同时也研究了铸造速度对铸锭中应力场和变形的影响。结果显示,改变铸造速度对铸锭中各应力分量的影响不同,因此也影响了铸锭可能的开裂方式;提高铸造速度大幅增加了轧制面收缩的程度,但翘曲主要受起始阶段铸造速度的影响,受稳态铸造速度的影响不太显著。初始铸造速度对翘曲的影响主要是由其对液穴深度的影响所致。Stress fields and ingot distortions during DC casting of a large size ingot were studied through numerical modeling and possible cracking modes and mechanisms of ingot distortions were analyzed. Meanwhile,the effects of the casting speeds on the stress fields and distortions were also studied. The results show that changing casting speed has different effects with respect to each stress component, so it also affects the possible cracking mode of the ingot. Increasing casting speed greatly enhanced rolling face shrinkage. At the same time, the butt-curl was mainly affected by the start-up casting speed while the influence of steady state casting speed was not obvious. The effect of start-up casting speed on the butt-curl was mainly attributed to its effect on the sump depth.

关 键 词：半连续铸造 翘曲 收缩 铸造速度 液穴深度 

分 类 号：TG146.2[一般工业技术—材料科学与工程]