锥形热顶对高纯Dy靶材铸锭内部缺陷与组织的影响  

Effects of Tapered Hot Top on Internal Defects and Microstructure of High Purity Dys⁃prosium Target Ingot

作　　者：张永健 ZHANG Yongjian(Fujian Golden Dragon Rare-Earth Co,.Ltd.,Longyan 366309;Fujian Enterprise Engineering Technology Research Center for Functional Rare Earth Materials,Longyan 366309)

机构地区：[1]福建省金龙稀土股份有限公司,龙岩366309 [2]福建省稀土功能材料企业工程技术研究中心,龙岩366309

出　　处：《特种铸造及有色合金》2025年第3期475-480,共6页Special Casting & Nonferrous Alloys

摘　　要：设计了一种锥形热顶,利用ProCAST软件对高纯镝(Dy)铸锭真空模铸过程进行数值模拟,探究了热顶锥段高度及锥度对Dy铸锭凝固时缺陷分布的影响。结果表明,锥形热顶能够明显改善铸锭内部缺陷。当锥段高度为130 mm,横截面尺寸为120 mm×126 mm时,铸锭液穴深度最浅,缩孔体积最小,为11.78 cm3。铸锭底部与边部组织为细小的等轴晶和发达的柱状晶,中心部位组织为等轴晶。A tapered hot top was designed,and the vacuum mould casting process of high purity dysprosium(Dy)ingot was numerically simulated by the ProCAST software.The influence of height and taper of hot top on defect distribution of Dy ingot during solidification was investigated.The results indicate that the conical hot top can obviously improve the internal defects of ingot.When the height of conical section is 130 mm and the cross-sectional size is 120 mm×126 mm,the depth of liquid cavity is the shallowest and the volume of shrinkage cavity is the smallest,which is 11.78 cm3.The microstructure at the bottom and edge of ingot is fine-equiaxed crystal and well-developed columnar crystal,while that at the center is equiaxed crystal.

关 键 词：DY 铸造缺陷 锥形热顶 数值模拟 

分 类 号：TG249.3[金属学及工艺—铸造] TG115.21