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| ��/�� Grain Boundary Movement in Fe-0. 2%C-0. 8%Cr During Solidification Process |
| YUE Xu-dong,LI Qing-chun,CHEN Shu-ying,CHANG Guo-wei |
| School of Materials Science and Engineering, Liaoning University of Technology, Jinzhou 121001, Liaoning, China |
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Abstract The moving process of ��/�� grain boundary during the solidification process of Fe-0. 2%C-0. 8%Cr has been observed in-situ with confocal scanning laser microscope (CSLM), and the establishment of ��/�� grain boundary, the moving mode, the moving speed and the influence of correlative factor were explored in detail. The results showed that the clear grain cannot be formed when �� phase merged during solidification process of the steel if the actual cooling rate was 0. 045 �桤s-1. The ��/�� grain boundary with shape of flat will be formed if there is no essential conjunction between �� phase in a long period of time. The movement of �� grain boundary cross point drives other ��/�� grain boundaries to move. The moving process is not stable, and the moving rate variation ranges from 0. 12 to 1. 65 ��m ��s-1. Temperature of the system is the chief factor for influencing the moving rate of ��/�� grain boundary during the solidification. When the temperature fluctuation of system appears, the solidified grain boundary is re-melted, which results in the catastrophic fluctuation of moving rate for ��/�� grain boundary. When the solidification process reaches its end, the average moving rate of ��/�� grain boundary is quicker than that of L/�� interface. The coarsening rate of crystal grain in the melt is slower than that of solidified solid phase crystal grain.
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Received: 13 October 2011
Published: 18 June 2013
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Corresponding Authors:
Xu-Dong YUE
E-mail: x.d.yue@163.com
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2013, Vol. 20 
