工程科学学报2016，Vol.38Issue(9)：1270-1277,8.DOI:10.13374/j.issn2095-9389.2016.09.011
铝合金大铸锭超声半连铸多场耦合的数值模拟与实验研究
Numerical simulation and experimental study of multi-field coupling for semi-continuous casting of large-scale aluminum ingots with ultrasonic treatment
摘要
Abstract
A multi-field coupling mathematical model was established to analyze the hot-top semi-continuous casting of a large-scale aluminum alloy of 630 mm in diameter with ultrasonic treatment ( UST) . The finite volume method combined with the self-com-piled function was used to get the distribution of the acoustic field, flow field and temperature field, and the industrial experimental re-search was also performed. The mechanism of ultrasonic treatment on the grain refinement of the large-scale aluminum alloy produced by hot-top semi-continuous casting was analyzed based on the simulation and experiment results. The simulation results show that ultra-sonic markedly influences the macroscopic physic field. With ultrasonic treatment, an upward recirculation zone forms beneath the end face of the radiation rod, the heat and mass transfer is promoted by the strong turbulence, the sump gets shallower and gentler, the ini-tial solidifying point on the ingot surface in the mold moves down, the transition zone becomes narrower, the width of it in the center drops from 342 mm to nearly 120 mm. The experimental results show that with ultrasonic treatment, the grain size becomes smaller and more homogeneous, the average grain size reduces by 103μm, the gap between the maximum and minimum grain size decreases from 135 to 64μm, and the grain boundary of the solidification structure becomes thinner.关键词
铝合金/超声波/铸造/耦合/数值模拟Key words
aluminum alloys/ultrasonic/casting/coupling/numerical simulation分类
矿业与冶金引用本文复制引用
徐婷,张立华,李瑞卿,唐佳,黄诚..铝合金大铸锭超声半连铸多场耦合的数值模拟与实验研究[J].工程科学学报,2016,38(9):1270-1277,8.基金项目
国家重点基础研究发展计划资助项目(2012CB619504) （2012CB619504）
国家自然科学基金资助项目(51475480) （51475480）
