摘要
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.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2012年第3期29-35,共7页
Materials Science and Technology
基金
国家自然科学联合基金资助项目(u0837601)
国家自然科学基金资助项目(50874054)
云南省创新团队资助项目(2009CI003)
云南省自然科学基金资助项目(2008CD087)
关键词
双辊连续铸轧
凝固微观组织
CA-FE方法
数值模拟
枝晶形貌
twin-roll continuous casting
solidification microstructure
cellular automaton-finite element meth- od
numerical simulation
dendrite morphology
