线性电磁搅拌对K417高温合金母合金锭质量的影响  

Linear Electromagnetic Stirring and Microstructures of K417 Superalloy Master Alloy Ingot

作　　者：金文中[1] 李军[1] 李廷举[1] 殷国茂[1] 

机构地区：[1]大连理工大学三束材料改性国家重点实验室及材料科学与工程学院,大连116024

出　　处：《真空科学与技术学报》2008年第6期579-583,共5页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金项目(No.50474055)

摘　　要：为了提高高温合金母合金锭的质量,本文提出了在高温合金真空熔铸过程中,施加线性电磁搅拌的真空电磁铸造新技术。使用电子探针和光学显微镜,研究了在真空熔铸的凝固过程,施加工频线性电磁搅拌对K417高温合金母合金锭质量的影响。实验结果表明:在K417高温合金真空熔铸的凝固过程中施加140A的工频线性电磁搅拌,能够细化高温合金母合金锭的等轴晶组织、增加高温合金母合金锭的断面等轴晶比例、大幅减轻枝晶偏析的程度并能将高温合金母合金锭的中心缩松缩孔比率从54%降低到35%,从而使高温合金母合金锭的质量得到明显改善。A novel technique-linear electromagnetic stirring（EMS） during solidification in vacuum castin（VC）-has been successfully developed to improve the microstructures of the superalloy master alloy ingots. The influence of the linear electromagnetic stirring on microstructures of the master alloy ingots was studied with electron probe micro-analysis （EPMA） and an optical microscope. The results show that a judicious choice of the stirring conditions significantly improves the quality of the master alloy ingot. A frequency of 50 Hz and a current of 140 A considerably reduse the sizes of the equiax crystal grains of the K417superalloy ingot, and increase the proportion of the equiax grains at a cross-section. Moreover, the dendritic segregation decreases, and the ratio of central shrinkage cavity drops from 54% to 35 %.

关 键 词：线性电磁搅拌 高温合金 母合金锭 质量 

分 类 号：TG146.4[一般工业技术—材料科学与工程]