Acta Metall Sin  2012, Vol. 48 Issue (5): 629-635    DOI: 10.3724/SP.J.1037.2011.00621

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EFFECT OF LONGITUDINAL MAGNETIC FIELD ON THE MICROSTRUCTURE OF DIRECTIONALLY SOLIDIFIED SUPERALLOY DZ417G WITH DIFFERENT SIZES

XUAN Weidong, REN Zhongming, LI Chuanjun, REN Weili, CHEN Chao, YU Zhan

Shanghai Key Laboratory of Modern Metallurgy & Materials Processing,Shanghai University, Shanghai 200072

XUAN Weidong, REN Zhongming, LI Chuanjun, REN Weili, CHEN Chao, YU Zhan. EFFECT OF LONGITUDINAL MAGNETIC FIELD ON THE MICROSTRUCTURE OF DIRECTIONALLY SOLIDIFIED SUPERALLOY DZ417G WITH DIFFERENT SIZES. Acta Metall Sin, 2012, 48(5): 629-635.

Abstract References Related Articles Recommended Metrics Download:  PDF(6218KB)  Export:  BibTeX | EndNote (RIS)       Abstract  In order to understand the influence of a longitudinal magnetic field on the microstructures of the superalloy DZ417G with different sample sizes, the superalloy DZ417G was directionally solidified under a longitudinal magnetic field. The solidification structures of the alloy with various dimensions of specimen have been investigated. The results showed that the columnar dendrites on the edge of samples were broken and changed into equiaxed dendrites in the magnetic field at the withdrawal velocity of 5 $\mu$m/s and temperature gradient of 70℃/cm. Additionally, it was found that equiaxed dendrites area expanded from the edge to the center of sample and the number of freckle-like macrosegregation increased with the size of sample. The columnar to equiaxed transition and freckle-like macrosegregation can be attributed to the thermoelectric magnetic convection (TEMC) induced by the magnetic field in the front of solid/liquid interface during directional solidification. Key words:  Ni-based superalloy      magnetic field      directional solidification      dendrite      thermoelectric magnetic convection      Received:  29 September 2011      Fund:  Projects of International Cooperation and Exchanges NSFC;National Basic Research Program of China;Shanghai Science and Technology Committee Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors XUAN Wei-Dong REN Zhong-Ming LI Zhuan-Jun REN Wei-Li CHEN Tiao YU Tan URL:  https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00621     OR     https://www.ams.org.cn/EN/Y2012/V48/I5/629 [1] Utech H P, Flemings M C.  J Appl Phys, 1966; 37: 2021 [2] Chedzey H A, Hurle D T J.  Nature, 1966; 210: 933 [3] Matthiesen D H, Wargo M J, Motakef S.  J Cryst Growth, 1987; 85: 557 [4] Robertson G D, Conner D O.  J Cryst Growth, 1986; 76: 100 [5] Moreau R, Laskar O, Tanaka M.  Mater Sci Eng, 1993; A173: 93 [6] Lehmann P, Moreau R, Camel D.  Acta Mater, 1998; 46: 4067 [7] Alboussiere T, Moreau R, Camel D.  C R Acad Sci, 1991; 313: 749 [8] Zhang H W, Chen R Z.  Acta Metall Sin, 1997; 33: 370     (张宏炜, 陈荣章. 金属学报, 1997; 33: 370) [9] Trivedi R, Liu S, Mazumder P, Simsek E.  Sci Technol Adv Mater,2001; 2: 309 [10] Zheng Q, Hou G C, Sun X F, Jin T, Guan H R, Hu Z Q.  J Mater Eng,2002; 3: 24      (郑启, 侯桂臣, 孙晓峰, 金涛, 管恒荣, 胡壮麒. 材料工程, 2002; 3: 24) [11] Qu M, Liu L, Tang F T, Fu H Z.  Trans Nonferrous Met Soc China,2009; 19: 1 [12] Mukherji D, Rosler J, Kruger M, Heilmaier M, Bolitz M C,Volkl R, Glatzel U, Szentmiklosi L.  Scr Mater, 2012; 66: 60 [13] Liu L, Huang T W, Qu M, Liu G, Zhang J, Fu H Z.  J Mater ProcessTechnol, 2010; 210: 159 [14] Huang T W, Liu L, Zhang W G, Zhang J, Fu H Z.  Acta Metall Sin,2009; 45: 1225      (黄太文, 刘林, 张卫国, 张军, 傅恒志. 金属学报, 2009, 45: 1225) [15] Ren W L, Zhang T, Ren Z M, Zhao A K, Zhong Y B, Guo J T. 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