摘要
首先建立了一个数学模型,用来模拟包覆(direct chill, DC)铸造过程和工艺参数(包括铸造速度、铸造温度、冷却水量)对包覆铸锭的影响规律。以模拟结果为依据,通过优化工艺参数成功制备了尺寸为Φ140 mm/Φ110 mm的AA4045/AA3003包覆铸锭,并通过实验测温对模型进行了验证。采用多种手段对界面的组织性能进行了检测。结果表明,测温结果与模拟结果相互吻合,模型可靠。优化后的包覆铸造工艺参数为:铸造速度100 mm/min,冷却水量35 L/min,铸造温度1020 K(AA4045)、1000 K(AA3003)。包覆铸锭界面处无气孔、夹杂等缺陷,通过元素扩散形成了约15μm的扩散层。界面抗拉强度为107.3MPa,大于AA3003合金基体强度,说明2种合金实现冶金结合。
A mathematic model was built to describe the cladding casting process and the casting parametric influence on the cladding billet.The effect of casting speed,casting temperature and internal cooling water rate on the casting process performance was discussed.Based on the numerical simulation results,the cladding billet was prepared successfully.Moreover,the model was verified by the temperature measurements during the cladding casting process.The interfacial characteristics were investigated by metallographic examination,energy dispersive spectrometer and universal testing machine.The results show that there is a good agreement between the measured and calculated results.The comprehensively considered casting process is:casting speed 100 mm/min,internal cooling water rate 35 L/min,casting temperature 1020 K(AA4045) and 1000 K(AA3003).Based on the simulation results,the AA4045/AA3003 cladding billet with no defects and Φ140 mm/Φ110 mm in size is fabricated successfully.A diffusion layer with 15 μm in width is formed around the bonding interface.The interfacial bonding strength is 107.3 MPa,higher than that of AA3003,indicating that the two alloys have been bonded metallurgically.
作者
郭菁
韩星
藤莹雪
王洪斌
张海涛
农登
Guo Jing;Han Xing;Teng Yingxue;Wang Hongbin;Zhang Haitao;Nong Deng(University of Science and Technology Liaoning,Anshan 114051,China;Liaoning Zhongwang Group Co.Ltd.,Liaoyang 111003,China;Key Laboratory of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang 100819,China;Guangdong Institute of Materials and Processing,Guangzhou 510651,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2018年第11期3321-3328,共8页
Rare Metal Materials and Engineering
基金
National Natural Science Foundation of China(51374128)
the Science and Technology Program of Guangdong,China(2013B010102026,2013B061800054,2015B090901044)
关键词
数值模拟
包覆铸锭
铸造参数:实验验证
接触温度
扩散层
numerical simulation
cladding billet
casting parameter
experiment verification
contact temperature
diffusion layer
