Abstract
The moving process of δ/δ 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 δ/δ grain boundary, the moving mode, the moving speed and the influence of correlative factor were explored in deta.il. The results showed that the clear grain cannot be formed when δ phase merged during solidification process of the steel if the actual cooling rate was 0.045 °C · s−1. The δ/δ grain boundary with shape of flat will be formed if there is no essential conjunction between δ phase in a long period of time. The movement of δ grain boundary cross point drives other δ/δ grain boundaries to move. The moving process is not stable, and the moving rate variation ranges from 0.12 to 1.65 μm · sp−1. Temperature of the system is the chief factor for influencing the moving rate of δ/δ 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 δ/δ grain boundary. When the solidification process reaches its end, the average moving rate of δ/δ grain boundary is quicker than that of L/δ interface. The coarsening rate of crystal grain in the melt is slower than that of solidified solid phase crystal grain.
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Foundation Item: Item Sponsored by National Natural Science Foundation of China (50874060)
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Yue, Xd., Li, Qc., Chen, Sy. et al. δ/δ Grain Boundary Movement in Fe-0. 2%C-0.8%Cr During Solidification Process. J. Iron Steel Res. Int. 20, 63–67 (2013). https://doi.org/10.1016/S1006-706X(13)60113-2
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DOI: https://doi.org/10.1016/S1006-706X(13)60113-2