热流密度对结晶器铜板热疲劳裂纹的影响  

Influence of total heat flux on thermal fatigue cracks of casting mold copper

作　　者：张宏杰[1,2] 沈明钢 温茂远[1] 蔡昌友[2] ZHANG Hong-jie;SHEN Ming-gang;WEN Mao-yuan;CAI Chang-you(No.1Steelmaking and Metallurgical Repair Plant,Ansteel Subsidiary Company,Anshan 114011,Liaoning,China;School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China)

机构地区：[1]鞍钢附属企业公司一炼钢冶金修造厂,辽宁鞍山114011 [2]辽宁科技大学材料与冶金学院,辽宁鞍山114051

出　　处：《连铸》2020年第6期42-47,共6页Continuous Casting

摘　　要：随着国内高拉速连铸机日渐增多,结晶器铜板的失效已经变为以热疲劳裂纹形式为主。采用ANSYS数值模拟软件对结晶器铜板温度和热流密度分布规律进行了研究。计算结果表明,结晶器铜板的温度分布和生产中热疲劳裂纹的形式不相同;铜板弯月面区发生热裂失效的主要原因是在一定温度下,上下运动的热流密度的集中区即“能量流”撕裂了铜板,因此减小结晶器铜板弯月面处的热流密度,有可能减少铜板热裂纹的产生。设计均匀传热、减少铜板和连铸坯裂纹生成的结晶器是未来技术发展的方向。计算结果表明,沟槽结晶器铜板表面刻划沟槽后可以减弱弯月面区域热流密度,改善结晶器铜板的不均匀传热状况。With the increasing number of high speed continuous casting machine in China,the failure of mold copper has become the main form of thermal fatigue crack.The influence of temperature and total heat flux on the thermal fatigue crack of copper plate is studied by ANSYS software.The simulation results show that the temperature distribution of the mold copper is different from that of the thermal fatigue crack in production.The main reason for the thermal crack failure in the meniscus of coppers is that the concentrated area of heat flux moving up and down at certain temperature,namely the"energy flow",tears the copper plate.Therefore,reducing the total heat flux at the meniscus of the mold copper may reduce the generation of thermal fatigue cracks.The design of mold with uniform heat transfer and reducing the cracks of mold copper and continuous casting slab is the direction of future technology development.The calculation results show that groove mold is carved on the surface of copper plate,the total heat flux in the meniscus area can be reduced and the uneven heat transfer of the mold copper can be improved.

关 键 词：弯月面 温度分布 热疲劳裂纹 热流密度 沟槽结晶器 有限元分析 

分 类 号：TF777[冶金工程—钢铁冶金]