基于反热传导法的镁合金半连铸一冷区换热系数研究  

Study on Heat Transfer Coefficient of Semi-Continuous Casting of Magnesium Alloy in Primary Cooling Zone Based on Inverse Heat Conduction Method

作　　者：于晓强 贾永辉 乐启炽 胡文义 赵大志 祝亚同 王平 YU Xiao-qiang;JIA Yong-hui;LE Qi-chi;HU Wen-yi;ZHAO Da-zhi;ZHU Ya-tong;WANG Ping(School of Materials Science and Engineering,Northeastern University,Shenyang 110819,Liaoning,China;College of Chemistry and Materials Science,Longyan University,Longyan 364012,Fujan,China)

机构地区：[1]东北大学材料科学与工程学院,辽宁沈阳110819 [2]龙岩学院化学与材料学院,福建龙岩364012

出　　处：《铸造》2023年第2期167-170,171-173,共7页Foundry

基　　金：国家自然科学基金(51904151);龙岩市科技计划项目(2021LYF9012)。

摘　　要：文中设计了模铸实验并采用喷水冷却方式来模拟AZ31镁合金半连铸一冷区传热过程,得到了用于反求界面换热系数的温度变化曲线。采用反热传导法求解了不同冷却水量下熔体-模具间的界面换热系数,并分析了冷却水量对界面换热系数的影响。结果表明,随着冷却水量的增加,界面换热系数峰值与冷却水量呈正相关,冷却水量由20 L/min提高到60 L/min时,换热系数峰值从1425.8 W/(m^(2)·K)增加到2727.5 W/(m^(2)·K),且高冷却水量的换热系数峰值出现在低的温度;随着冷却水量的增加,从铸坯边部到中心的凝固组织均匀性明显提高。In this paper,a mold casting experiment was designed and water spray cooling method was used to simulate the heat transfer process in the primary cooling zone of semi-continuous casting of AZ31 magnesium alloy,and the temperature variation curve was obtained for inverse calculation of the interface heat transfer coefficient.The interfacial heat transfer coefficient between melt and mold with different cooling water flow rates was calculated by inverse heat transfer method,and the effect of the cooling water flow rate on the interfacial heat transfer coefficient was analyzed.The results showed that with the increase of cooling water,the peak value of the interfacial heat transfer coefficient was positively correlated with the cooling water flow rate,when the cooling water flow rate increased from 20 L/min to 60 L/min,the peak heat transfer coefficient increased from 1425.8 W/(m~2·K)to 2727.54 W/(m~2·K)and the peak value of the interfacial heat transfer coefficient of high cooling water flow rate appeared at the low temperature.With the increase of the cooling water,the uniformity of solidification microstructure from edge to center of the billet was improved obviously.

关 键 词：镁合金 界面换热系数 冷却水量 反热传导法 微观组织 

分 类 号：TG146.22[一般工业技术—材料科学与工程]