ժҪ 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.
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.
YUE Xu-dong,LI Qing-chun,CHEN Shu-ying,CHANG Guo-wei. ��/�� Grain Boundary Movement in Fe-0. 2%C-0. 8%Cr During Solidification Process[J]. �й������ڿ���, 2013, 20(6): 63-67.
YUE Xu-dong,LI Qing-chun,CHEN Shu-ying,CHANG Guo-wei. ��/�� Grain Boundary Movement in Fe-0. 2%C-0. 8%Cr During Solidification Process. Chinese Journal of Iron and Steel, 2013, 20(6): 63-67.