摘要
建立耦合温度场的多晶相场模型,对非等温凝固下多枝晶的生长进行定量研究。发现热扩散系数越大,凝固潜热释放越快,枝晶生长速度越快,枝晶尺寸就越大;增大过冷度会导致凝固驱动力增强,凝固潜热释放速度和枝晶生长速度加快,枝晶转变的固相体积分数增大,大量溶质在液固界面处或枝晶间富集。
The polycrystalline phase-field model coupled with temperature field was established.The multiple dendrites growth in non-isothermal solidification was studied quantitatively.It is found that the larger the coefficient of thermal diffusion is,the faster the latent heat of solidification is released,the faster the dendrite growth rate is,the larger the dendrite size is.The increasing undercooling will lead to the enhancement of solidification driving force,the acceleration of solidification latent heat release and dendrite growth,the increase of solid volume fraction of dendrite transition,and the enrichment of a large number of solutes at the liquid-solid interface or between dendrites.
作者
王永彪
位明光
刘新田
刘建秀
肖艳秋
关邵康
龙伟民
WANG Yongbiao;WEI Mingguang;LIU Xintian;LIU Jianxiu;XIAO Yanqiu;GUAN Shaokang;LONG Weimin(Henan Key Laboratory of Mechanical Equipment Intelligent Manufacturing,Zhengzhou Light Industry University,Zhengzhou 450002,China;Henan Key Laboratory of Advanced Magnesium Alloy,Zhengzhou University,Zhengzhou 450002,China;China Innovation Academy of Intelligent Equipment Co.,Ltd.,Ningbo 315700,China)
出处
《热加工工艺》
北大核心
2021年第1期58-62,共5页
Hot Working Technology
基金
国家自然科学基金-青年科学基金项目(51901208)
河南省高等学校重点科研项目(20B430020)
河南省科技攻关项目(202102210016,202102210272)
郑州轻工业大学博士科研启动基金项目(010013501050043)
郑州市科技创新专项(2019CXZX0065)。
关键词
相场法
非等温凝固
枝晶生长
phase-field method
non-isothermal solidification
dendritic growth
