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作 者:董志成 张炯明 马海涛 DONG Zhicheng;ZHANG Jiongming;MA Haitao(State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China)
出 处:《有色金属科学与工程》2019年第5期40-45,112,共7页Nonferrous Metals Science and Engineering
基 金:国家自然科学基金资助项目(51834002)
摘 要:基于Fluent建立了150 mm×150 mm结晶器的三维模型,模拟计算了结晶器内流场、温度场及溶质分布的变化,并对二冷区宏观偏析进行了模拟.结果发现,结晶器角部传热方式为二维传热,与表面一维传热相比凝固速度较快.结晶器角部钢液存在回流,同时弯月面处钢液也存在小的回流.受回流及凝固的影响,碳元素在结晶器内会重新分配,上部表现为正偏析、回流通道表现为负偏析.并且发现,由于固液相扩散系数的不同,直到凝固终点,铸坯冷却过程中都会存在环形负偏析.Based on Fluent software,a three-dimensional model of 150 mm×150 mm mold was built.The variation in flow field,temperature field and solute distribution in the mold were calculated and the macro-segregation in the secondary cooling zone was simulated.It was found that the solute at the corner of the mold solidified faster than that on the surface as heat transfer of the former is two-dimensional not one-dimensional.The molten steel at the corner of the mold recirculated,and that at the meniscus of the mold refluxed slightly.Under the influence of recirculation and solidification,carbon was redistributed in the mold so that there appeared positive carbon segregation at the upper part of the mold and negative one in the recirculation channel.It was also found that there was annular negative carbon segregation during the entire cooling of the casting billet as a result of the difference in solid-liquid phase diffusion coefficient.
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