【作者】 杜卓林； 陈义良；

【Author】 DU Zhuo-lin;CHEN Yi-liang Thermal Science and Energy Engineering Department University of Science and Technology of China, Hefei, 230026, China

【机构】 中国科学技术大学热科学与能源工程系；

【摘要】 用数值计算的方法对重力浇铸下Al/SiC颗粒二维凝固过程进行了研究,给出了各种因素对最终颗粒分布的影响.结果表明,侧面冷却时凝固件中颗粒的分布大致可分为三个区域:靠近底部的颗粒堆积区,靠近顶部的颗粒体积分数近似为零区,以及颗粒体积分数近似保持不变区.冷却温度升高时,凝固速度降低,底部颗粒堆积区和顶部颗粒分数为零区范围都将增大;颗粒尺寸增大时,由于沉降速度较快,也会产生同样的情况.更多还原

【Abstract】 A numerical investigation of Al /SiC particles two dimension solidification process during gravity casting isconducted. The effects of various processing parameters were explored.It is found that there exit three zones whensolidification is from side: The denuded region in the top portion of the solidification ingot where the particle volumefraction is nearly zero, particle packed region near the bottom, and the region where the particle volume fraction isnearly the same as initial.Higher Higher cooling temperatures results in slower solidification and hence a larger denuded zoneand a larger particle packed zone,so do large particle size.更多还原