连铸圆坯凝固过程微观组织数值模拟耿明山.docVIP

连铸圆坯凝固微观组织数值模拟 耿明山，周守航，韩庆礼, （中冶京诚工程技术有限公司，北京 100176） CAFé模型中，元胞自动机方法与连铸过程中传热计算进行耦合。利用ProCAST软件对连铸圆坯的凝固过程过程进行仿真模拟，通过连铸坯温度测量证明预测的连铸坯表面温度与实际比较接近。应用CAFé法实现了连铸坯凝固过程三维微观组织及其形成过程的模拟，通过对比试验和模拟的圆坯的宏观结构对模拟的结果进行了评价，证明模拟结果与实验结果吻合。 关键词：凝固，微观组织，晶粒，模拟 中图分类号：TF777.1 文献标识码： 文章编号： Numerical Simulation of the Solidification Microstructure during Continuous Casting Round Bloom GENG ming-shan, ZHOU shou-hang, HAN qing-li, Capital Engineering Research Incorporation Limited, Beijing 100176, China Abstract：Prediction and control of steel microstructure during and after the continuous casting process is an extremely importand task for steel producers making special steels with high quanlity demand. Continuous casting is a very complex process with series of parallel phenomena with heat and mass transfer, solidification and phase transformations. In the CAFé model, the cellular automation method was combined with heat transfer calculation during the continuous process. Simulations of solidification process of continuous cast round bloom were carried out with ProCAST software, the simulation result are consistent with the measure surface temperature of continuous casting round bloom. Base on the CAFé method, 3D-microstructure of continuous casting round was simulated during solidification process, Simulation results were evaluated from comparison between experimentally observed and simulated macrostructures of the round bloom. It was proved that the simulation result was consistent with industy experiment result. Key words： 前言 凝固过程是材料制备成形中的一个重要基础阶段，凝固微观组织通常直接决定这材料的最终力学性能和使用性能。凝固过程控制已成为大幅度提高传统材料性能和开发新型材料的重要途径。计算机模拟的方法能够对复杂问题进行精确定量的描述。凝固过程的模拟包括宏观（温度场、浓度场、流场等）模拟和微观（形核、生长）模拟。如果能够通过计算机模拟的方法预测出材料的凝固微观组织，不仅有利于深入理解凝固组织形成机理，而且可以据此调整材料制备生产工艺，从而生产出具有理想凝固组织的材料和铸件，达到优化生产的目的。如何考虑较多的因素进行模拟，进一步完善热物性参数数据库，使模拟更接近实际凝固过程是仿真研究的关键。[] CAFE模型简介 材料凝固模拟的目的是对运动的固-液界面进行时间和空间上的描述，目前的数值方法主要有：确定性模拟方法（Deterministic modeling）、随机性模拟方法（Stochastic modeling）[]和相场方法（Phase-field modeling）[]。凝固过程微观组织模拟是指在晶粒尺度上对凝固过程的微观组织