摘要
本文以大规格镁合金扁锭半连续铸造为研究对象,采用基于多场耦合的数值模拟技术模拟了差相脉冲磁场作用下镁合金扁锭半连续铸造过程中的宏观物理场,研究了差相脉冲磁场相位差对电磁力、温度场、凝固过程、溶质元素分布及宏观偏析的影响。结果表明:相位差对凝固中后期影响更明显。当相位差从0°增至72°时,凝固初期换热有所减弱;而凝固中后期换热增强,液穴深度明显变浅,中心部位凝固速度加快,横截面内温度场变均匀。此外,适当提高相位差至72°有利于缓解两相区内贫溶质的问题,减少凝固后横截面内最大负偏析率和整体偏析率;相位差继续增大到108°不仅明显削弱了凝固前期的换热强度,而且还会削弱凝固中后期的换热强度,使液穴变深,凝固速度减慢,偏析率增大。
This paper studied the semi-continuous casting of large-scale magnesium alloy slab.The macro physical field in the semi-continuous casting process of magnesium alloy slab was simulated by numerical simulation technology based on multi-field coupling.The effects of the phase difference of out-of-phase pulsed magnetic field on the electromagnetic force,temperature field,solidification process,solute element distribution and macrosegregation were studied.The results show that the phase difference has more obvious effect on the middle and late solidification stages.When the phase difference increases from 0° to 72°,the heat transfer is weakened in the early solidification stage,while it is promoted in the middle and late solidification stages.Meanwhile,the shallower depth of liquid hole and the accelerated solidification rate in the central part are achieved,and the temperature field in the cross section becomes uniform.In addition,increasing the phase difference to 72° is beneficial to alleviate the problem of solute poverty in the two-phase region and reduce the maximum negative segregation rate and the overall segregation rate in the cross-section after solidification.However,when the phase difference continues to increase to 108°,the heat transfer intensity decreases not only in the early solidification stage significantly,but also in the middle and late solidification stages,leading to the deeper liquid hole,lower solidification rate and higher segregation rate.
作者
段文超
李金宝
潘艳林
朱新杰
韩峰
毛华
邱明坤
周古昕
郎玉婧
张志强
DUAN Wenchao;LI Jinbao;PAN Yanlin;ZHU Xinjie;HAN Feng;MAO Hua;QIU Mingkun;ZHOU Guxin;LANG Yujing;ZHANG Zhiqiang(China Academy of Ordnance Science Ningbo Branch,Ningbo 315103,China;Key Laboratory of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang 110819,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2024年第6期1982-1997,共16页
The Chinese Journal of Nonferrous Metals
基金
内蒙古自治区自然科学基金资助项目(2024QN05062)
中国博士后科学基金资助项目(2023M743274)
国家重点研发计划资助项目(2021YFB3701004)。
关键词
数值模拟
多场耦合
镁合金扁锭
半连续铸造
差相脉冲电磁
numerical simualtion
multi-field coupling
magnesium alloy slab
semi-continuous casting
out-of-phase pulsed electromagnetic
