Improving ingot homogeneity by modified hot-top pulsed magneto-oscillation  

作　　者：Fan Zhang Hong-gang Zhong Yu-qian Yang Ming-xu Pan Ren-xing Li Qi-jie Zhai 

机构地区：[1]Center for Advanced Solidification Technology,Shanghai University,Shanghai 200444,China [2]Daye Special Steel Co.,Ltd.,Huangshi 214429,Hubei,China

出　　处：《Journal of Iron and Steel Research International》2022年第12期1939-1950,共12页

基　　金：This work was financially supported by the National Key Research and Development Program of China(Nos.2020YFB2008400 and 2017YFB0701800);the National Natural Science Foundation of China(No.U1760204);In addition,the authors would liketo thankHui Shaoand Zi-hao Yin from Centerfor Advanced Solidification Technology,Shanghai University for their help in the experiment and data analysis.

摘　　要：Heavy ingots,especially the ingot of more than 10 t,often contain detrimental heterogeneous defects,such as macrosegregation,shrinkage pipes,and cracks.Hot-top pulsed magneto-oscillation(HPMO)can refine the solidified structure of ingot and improve their homogeneity.However,it may exacerbate the positive segregation at the upper part of the ingot body.Thus,a round table HPMO riser with a feeding part was designed,and the microstructure and macrosegregation of Al–Si alloy ingots solidified with and without HPMO were investigated.The simulation and experimental results indicated that round table HPMO riser could enable fine and uniform solidified structures in the whole ingot body;in the meantime,feeding part allowed the melt with enriched solute to gather in the upper part of the riser until the last solidification stage of ingot.This provides an effective approach for obtaining highly homogenized ingots.

关 键 词：HOMOGENEITY Hot-top pulsed magneto-oscillation Heavy ingot MACROSEGREGATION Simulation 

分 类 号：TG21[金属学及工艺—铸造]