Acta Metall Sin  2011, Vol. 47 Issue (3): 275-283    DOI: 10.3724/SP.J.1037.2010.00485

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CONVECTION EFFECTS AND BANDING STRUCTURE FORMATION MECHANISM DURING DIRECTIONAL SOLIDIFICATION OF PERITECTIC ALLOYS I. Experimental Result

LUO Liangshun1,2, ZHANG Yumin2, SU Yanqing1, WANG Xin1, GUO Jingjie1,FU Hengzhi 1

1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001 2. National Key Laboratory of Science and Technology on Advanced Composites in Special Environment, Harbin Institute of Technology, Harbin 150001

LUO Liangshun ZHANG Yumin SU Yanqing WANG Xin GUO Jingjie FU Hengzhi . CONVECTION EFFECTS AND BANDING STRUCTURE FORMATION MECHANISM DURING DIRECTIONAL SOLIDIFICATION OF PERITECTIC ALLOYS
I. Experimental Result. Acta Metall Sin, 2011, 47(3): 275-283.

Abstract References Related Articles Recommended Metrics Download:  PDF(3936KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Systematic directional solidification experiments were conducted to investigate the convection effects on the banding structure evolution and macrosegregation in nonfaceted–non–faceted model Fe–Ni alloy using conventional resistance heating and induction heating Bridgman directional solidification methods in this paper. It was found that convection can induce severe axial and radial macrosegregation in the directionally solidified samples, and make the microstructures complex and mae the steady state difficult to achieve. Axiamacrosegregation was reflectein finite samples olidified from the beginning to the enof soidification with the transiion from primary phase to peritectic phase. The primary–peritectic transition depended on the alloy composition and convection strengh. Radial macrosegregation reflected in the solute concentration poor in the center and rich in edge, and a primary–peritectic transition also exist in the lateral directional from the sample to the edge. Key words:  peritectic alloy      directional solidification      convection      segregation      banding structure      Received:  19 September 2010      ZTFLH:  TG111.4   Fund:  Supported by National Natural Science Foundation of China (Nos.50901025 and 50771041) and National Science Foundation for Post–doctoral Scientists of China (No.20090450840) Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors LUO Liang-Shun ZHANG Yu-Min SU Pan-Qiang YU Xin GUO Jing-Jie FU Heng-Zhi URL:  https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00485     OR     https://www.ams.org.cn/EN/Y2011/V47/I3/275 [1] Kerr H W, Kurz W. Int Mater Rev, 1996; 41: 129 [2] Johnson D R, Inui H, Yamaguchi M. Acta Mater, 1996;44: 2523 [3] Lapin J, Klimova A, Velisek R, Kursa M. 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