Effects of Spiral Magnetic Field on Structures Transformation and Macrosegregation of Sn-Pb Alloy  

作　　者：Xingguo ZHANG Qian ZHAO Jianshe GUO Qingyuan XING Liang DENG Xiaoguang HOU Canfeng FANG 

机构地区：[1]School of Materials Science and Engineering, Dalian University of Technology [2]Baoshan Iron and Steel Company Limited

出　　处：《Acta Metallurgica Sinica(English Letters)》2013年第3期345-351,共7页金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.50875031);High-Tech Project of Bao Steel (No.10K029ECES)

摘　　要：The effect of spiral magnetic field （SMF） on the solidification process of Sn-20 wt.%Pb hypoeutectic alloy was studied in this work. The temperature distribution and the macrosegregation together with the eutectic lamellar spacing during solidification were measured under different magnetic fields. The results indicate that the compositions in the top and bottom portions of the sample are nearly the same and the segregation phenomenon is basically eliminated by SMF at an exciting current of 125 A. The morphology of the primary phase transforms from coarse dendrite to rosette or ellipsoidal equiaxed crystal and the spacing of the eutectic lamellar increases from 1.6 to 3.9 μm when the exciting current increases from 0 to 125 A. Moreover, if the exciting current is high enough, the forced fluid flow caused by SMF will enhance the process of transition from lamellar eutectic structure to anomalous rod-like one.The effect of spiral magnetic field （SMF） on the solidification process of Sn-20 wt.%Pb hypoeutectic alloy was studied in this work. The temperature distribution and the macrosegregation together with the eutectic lamellar spacing during solidification were measured under different magnetic fields. The results indicate that the compositions in the top and bottom portions of the sample are nearly the same and the segregation phenomenon is basically eliminated by SMF at an exciting current of 125 A. The morphology of the primary phase transforms from coarse dendrite to rosette or ellipsoidal equiaxed crystal and the spacing of the eutectic lamellar increases from 1.6 to 3.9 μm when the exciting current increases from 0 to 125 A. Moreover, if the exciting current is high enough, the forced fluid flow caused by SMF will enhance the process of transition from lamellar eutectic structure to anomalous rod-like one.

关 键 词：Spiral magnetic field Forced convection Eutectic lamellar spacing Sn-Pb alloy Composition segregation 

分 类 号：TG111.4[金属学及工艺—物理冶金]