鉴于双辊薄带连铸等轴晶区半固态铸轧组织对产品性能的重要性,基于热传输、流动传输、溶质传输等基本传输过程以及晶粒生长物理过程,建立了双辊连续铸轧纯铝凝固过程的宏观温度场、浓度场、微观组织及枝晶形貌演化的三维数学模型.采用CA-FE法对双辊连续铸轧纯铝在水冷钢辊连续铸轧中的凝固过程进行了模拟,采用光学显微镜研究了铸轧工艺参数对凝固组织的影响.数值模拟结果表明,所建立的数学模型能够合理描述晶粒沿任意角度生长的过程,温度场、溶质场和微观组织形貌的模拟计算结果合理.模拟结果与实验结果基本吻合,检验了模型的正确性.
The width of columnar grain zone in as cast strips is mainly determined by the length of columnar grains at nip point. Coupling temperature field, concentration field and micro growth, based on the basic tromsfer process, including heat transfer, flow transfer and solute transfer, and the physics of growth process of crystal grains, the mathematical models for the 3D simulation of mierostrueture and free dendrite growth of twin-roll continuous casting pure aluminum thin strip were developed. The simulation of the solidification process of pure aluminum in water-cooled steel mould of twin-roll continuous casting was presented by CA-FE method. The in- fluence of continuous casting process parameters on the solidification microstructure were researched by optical microscope. The results show that the grain growth in random preferential growth directions can be described by the model reasonably, and the calculation results fit the experimental ones well.
参考文献
| [1] | 张纬栋,任三兵,杜锋,王波,张立,樊俊飞,张捷宇.双辊薄带连铸布流系统的数理模拟[J].过程工程学报,2010(z1):256-259. |
| [2] | Yuan Fang,Zhen-min Wang,Qing-xiang Yang,Yun-kun Zhang,Li-gang Liu,Hong-yan Hu,Yue Zhang.Numerical simulation of the temperature fields of stainless steel with different roller parameters during twin-roll strip casting[J].矿物冶金与材料学报,2009(03):304-308. |
| [3] | Hu Zhao;Peijie Li;Liangju He .Coupled analysis of temperature and flow during twin-roll casting of magnesium alloy strip[J].Journal of Materials Processing Technology,2011(6):1197-1202. |
| [4] | M.C.Flemings;R.W.Cahn .Organization and trends in materials science and engineering education in the us and Europe[J].Acta materialia,2000(1):371-383. |
| [5] | W.J.Boettinger;S.R.Coriell .Solidification microstructures: recent developments, future directions[J].Acta materialia,2000(1):43-70. |
| [6] | 许庆彦,冯伟明,柳百成,熊守美.铝合金枝晶生长的数值模拟[J].金属学报,2002(08):799-803. |
| [7] | 杨明波,潘复生,彭晓东,侯仕东,丁培道.双辊薄带凝固组织的数值模拟（Ⅰ）--数学模型的建立及验证[J].钢铁研究学报,2001(04):19-24. |
| [8] | 杨明波,潘复生,彭晓东,丁培道.双辊薄带凝固过程的宏观-微观耦合数学模型[J].重庆大学学报（自然科学版）,2005(05):39-44. |
| [9] | 湛利华,李晓谦,唐朝阳,钟掘.铝带坯连续铸轧过程热力耦合有限元分析[J].中国机械工程,2005(11):979-984,996. |
| [10] | 刘永刚,陈军,潘冶,孙国雄,仇春荔.Al-4.5%Cu合金凝固过程显微组织的数值模拟[J].中国有色金属学报,2002(06):1130-1135. |
| [11] | 季晨曦,张炯明,任嵬,王新华.双辊薄带连铸柱状晶组织模拟[J].北京科技大学学报,2008(10):1107-1111,1121. |
| [12] | LIU Xiao-bo,XU Qing-yan,JING Tao,LIU Bai-cheng.Simulation of microstructures in solidification of aluminum twin-roll casting based on CA[J].中国有色金属学会会刊（英文版）,2009(02):422-427. |
| [13] | Wang, B.;Zhang, J.Y.;Li, X.M.;Qi, W.H. .Simulation of solidification microstructure in twin-roll casting strip[J].Computational Materials Science,2010(Suppl.1):S135-S139. |
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