过热度与拉速对矩形连铸坯凝固组织的影响  

Effect of superheats and pulling speeds on solidification structure of rectangular continuous casting billets

作　　者：吴钢 陈慧琴[1] WU Gang;CHEN Huiqin(School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,Shanxi,China)

机构地区：[1]太原科技大学材料科学与工程学院,山西太原030024

出　　处：《连铸》2024年第6期61-69,共9页Continuous Casting

基　　金：中央引导地方科技发展资金自由探索资助项目(YDZJSX2021A039);2023年度山西省科研实践创新类资助项目(2023KY643)。

摘　　要：为提高CuNiCoSi矩形连铸坯凝固组织质量,利用CA-FE法建立了CuNiCoSi矩形坯截面凝固组织模型,通过该模型研究不同过热度与拉速对凝固组织影响。结果表明,降低过热度可提高凝固组织中等轴晶区占比,改善等轴晶区的晶粒均匀性。其他工况不变,将过热度由30℃降至15℃,等轴晶区面积由42.90%增大至47.32%;最大等轴晶粒面积由42.06 mm^(2)减小至33.94 mm^(2)。提高拉速不仅能提高凝固组织中等轴晶区占比,还可获得更细的等轴晶粒。拉速由100 mm/min增大至400 mm/min,等轴晶区面积由42.48%增大至50.14%;平均等轴晶面积由10.59 mm^(2)减小至9.38 mm^(2)。过热度与拉速优化后,铸坯凝固组织质量明显改善。To improve the solidification microstructure of CuNiCoSi rectangular continuous casting billets,a CuNiCoSi rectangular billet cross-section solidification microstructure model was established using the CA-FE method.The effects of different superheats and pulling speeds on the solidification microstructure were investigated using this model.The results indicate that reducing superheat can increase the proportion of equiaxed crystal zone in the solidification microstructure and improve the uniformity of the equiaxed crystal zone.Keeping other conditions constant,decreasing superheat from 30℃to 15℃resulted in an increase in the equiaxed crystal zone area from 42.90%to 47.32%,while the maximum equiaxed grain area decreased from 42.06 mm^(2)to 33.94 mm^(2).Increasing the pulling speed can increase the proportion of equiaxed grains in the solidification structure and obtain finer equiaxed grains.Increasing the pulling speed from 100 mm/min to 400 mm/min resulted in an increase in the equiaxed crystal zone area from 42.48%to 50.14%,while the average equiaxed crystal area decreased from 10.59 mm^(2)to 9.38 mm^(2).After optimizing the superheat and pulling speed,the quality of the billet solidification microstructure has significantly improved.

关 键 词：CuNiCoSi合金 矩形连铸坯 凝固组织 过热度 拉速 

分 类 号：TF777[冶金工程—钢铁冶金]